SUSY Publications

UF Publications

SUSY/BSM Papers - Experiment

  • Else Lytken (for the CDF and D0 Collaborations), " Searches for Supersymmetry at the Tevatron ", arXiv:hep-ex/0605061v1 (2006).
    The results for searches for Supersymmetry (SUSY) at the Tevatron Collider are summarized in this paper. We focus here on searches for trileptons and the lightest stop, as well as scenarios with R-parity violation and split supersymmetry. No significant excesses with respect to the Standard Model were observed and constraints are set on the SUSY parameter space.

  • M. Carena (1), R.L. Culbertson (2), S. Eno (3), H.J. Frisch (2), S. Mrenna (4) ((1) FNAL, (2) Univ. of Chicago, (3) Univ. of Maryland, (4) Argonne), " The Search for Supersymmetry at the Tevatron Collider ", arXiv:hep-ex/9712022v1, Rev.Mod.Phys. 71, 937-981 (1997).
    We review the status of searches for Supersymmetry at the Tevatron Collider. After discussing the theoretical aspects relevant to the production and decay of supersymmetric particles at the Tevatron, we present the current results for Runs Ia and Ib as of the summer of 1997. To appear in the book "Perspectives in Supersymmetry", edited by G.L. Kane, World Scientific.

Same-sign dileptons signature

  • F. Abe, et al (CDF Collaboration), " Search for R-Parity Violating Supersymmetry Using Like-Sign Dielectrons in pp̅ Collisions at √s = 1.8 TeV ", Phys. Rev. Lett. 83, 2133 - 2138 (1999).
    We present a search for like-sign dielectron plus multijet events using 107 pb-1 of data in pp̅ collisions at sqrt[s] = 1.8 TeV collected in 1992–1995 by the CDF experiment. Finding no events that pass our selection, we set σBR limits on two supersymmetric processes that can produce this experimental signature: gluino-gluino or squark-antisquark production with R-parity violating decays of the charm squark or lightest neutralino via a nonzero λ121′ coupling. We compare our results to the next-to-leading order calculations for gluino and squark production cross sections and set lower limits on M(g̃), M(t̃1), and M(q̃).

  • T. Affolder, et al (CDF Collaboration), " Search for Gluinos and Squarks Using Like-Sign Dileptons in pp̅ Collisions at sqrt[s] = 1.8 TeV ", Phys. Rev. Lett. 87, 251803 (2001).
    We present results of the first search for like-sign dilepton ( ee, eμ, μμ) events associated with multijets and large missing energy using 106 pb-1 of data in pp̅ collisions at sqrt[s] = 1.8 TeV collected during 1992–1995 by the CDF experiment. Finding no events that pass our selection, we examine pair production of gluinos ( g̃) and squarks ( q̃) in a constrained framework of the minimal supersymmetric standard model. At tanβ = 2 and μ = -800 GeV /c2, we set 95% confidence level limits of Mg̃>221 GeV /c2 for Mg̃≃Mq̃, and Mg̃>168 GeV /c2 for Mq̃≫Mg̃, both with small variation as a function of μ.

  • Jane Nachtman, David Saltzberg, Matthew Worcester (CDF Collaboration), " Study of a Like-Sign Dilepton Search for Chargino-Neutralino Production at CDF ", arXiv:hep-ex/9902010v1 (1999).
    We propose a like-sign dilepton search for chargino-neutralino production in p-pbar collisions at sqrt(s) = 1.8 TeV, which complements the previously published trilepton search by the CDF detector using Fermilab Run I data. Monte Carlo predictions for the signal and background efficiencies indicate a significant increase in sensitivity to chargino-neutralino production compared to the traditional trilepton analysis alone.

  • Jane Nachtman, David Saltzberg, Matthew Worcester (CDF Collaboration), " LIKE-SIGN DILEPTON SEARCH FOR CHARGINO-NEUTRALINO PRODUCTION AT CDF ", International Journal of Modern Physics A, Vol. 16, No. supp01B (2001) 797-800.
    We present new results from the like-sign dilepton search for chargino-neutralino production in collisions at , which complements the previously published trilepton search with the CDF detector using Fermilab Run IB data. Monte Carlo calculations of signal efficiency and backgrounds, as well as estimates of certain back grounds taken from Run IB data, indicate a significant increase in sensitivity to production compared to the traditional trilepton analysis alone.

  • A. Abulencia, P. Wittich, et al (CDF Collaboration), " Inclusive Search for New Physics with Like-Sign Dilepton Events in ppbar Collisions at sqrt{s} = 1.96 TeV ", arXiv:hep-ex/0702051v2, Phys. Rev. Lett. 98, 221803 (2007).
    We describe a search for anomalous production of events with two leptons ($e$ or $\mu$) of the same electric charge in \ppbar collisions at a center-of-mass energy of 1.96 TeV. Many extensions to the standard model predict the production of two leptons of the same electric charge. This search has a significant increase in sensitivity compared to earlier searches. Using a data sample corresponding to 1 \invfb of integrated luminosity recorded by the CDF II detector, we observe no significant excess in an inclusive selection (expect $33.2\pm4.7$ events, observe 44) or in a SUSY-optimized selection (expect $7.8\pm1.1$ events, observe 13.)

Dileptons signature

  • D. Denegri, W. Majerotto, L. Rurua, " Constraining the minimal supergravity model parameter tan β by measuring the dilepton mass distribution at CERN LHC ", Phys. Rev. D 60, 035008 (1999).
    We study the dependence on tan β of the event kinematics of final states with e+e-/μ+μ-/eμ∓+ETmiss+jets, as expected in pp collisions at CERN LHC, within the framework of the minimal supergravity model. With an increase of tan β, the third generation sparticle masses mτ̃1 and mb1 decrease due to the increase of the tau and bottom Yukawa couplings. As a result, the gluino, top squark, sbottom, chargino, and neutralino decays to third generation particles and sparticles are enhanced. With tan β rising, we observe a characteristic change in the shape of the dilepton mass spectra in e+e-/μ+μ-+ETmiss+jets versus eμ∓+ETmiss+jets final states, reflecting the presence of the decays χ̃20→lL,Rl∓→χ̃10l+l-, χ̃20→χ̃10l+l-, and χ̃20→τ̃1τ∓→χ̃10τ+τ-, χ̃20→τ+τ-χ̃10, respectively. We exploit this effect for constraining the value of tan β.

  • V. M. Abazov, et al (D0 Collaboration), " Search for Randall-Sundrum Gravitons in Dilepton and Diphoton Final States ", arXiv:hep-ex/0505018v2, Phys. Rev. Lett. 95, 091801 (2005).
    We report the first direct search for the Kaluza-Klein (KK) modes of Randall-Sundrum gravitons using dielectron, dimuon, and diphoton events observed with the D0 detector operating at the Fermilab Tevatron p[overline p] Collider at sqrt(s)=1.96 TeV. No evidence for resonant production of gravitons has been found in the data corresponding to an integrated luminosity of [approximate]260 pb-1. Lower limits on the mass of the first KK mode at the 95% C.L. have been set between 250 and 785 GeV, depending on its coupling to standard model particles.

  • V. M. Abazov, et al (D0 Collaboration), " Search for Large Extra Spatial Dimensions in Dimuon Production with the D0 Detector ", arXiv:hep-ex/0506063v2, Phys. Rev. Lett. 95, 161602 (2005).
    We present the results of a search for the effects of large extra spatial dimensions in p[overline p] collisions at sqrt(s)=1.96 TeV in events containing a pair of energetic muons. The data correspond to 246 pb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. Good agreement with the expected background was found, yielding no evidence for large extra dimensions. We set 95% C.L. lower limits on the fundamental Planck scale between 0.85 and 1.27 TeV within several formalisms. These are the most stringent limits achieved in the dimuon channel to date.

  • V. M. Abazov, et al (D0 Collaboration), " Search for Neutral, Long-lived Particles Decaying into Two Muons in p-pbar Collisions at sqrt(s) = 1.96 TeV ", arXiv:hep-ex/0607028v1, Phys. Rev. Lett. 97, 161802 (2006).
    We present a search for a neutral particle, pair-produced in p-pbar collisions at sqrt(s)=1.96 TeV, which decays into two muons and lives long enough to travel at least 5 cm before decaying. The analysis uses ~380 pb^-1 of data recorded with the D0 detector. The background is estimated to be about one event. No candidates are observed, and limits are set on the pair production cross section times branching fraction into dimuons + X for such particles. For a mass of 10 GeV and lifetime of 4x10^-11 s, we exclude values greater than 0.14 pb (95% C.L.). These results are used to limit the interpretation of NuTeV 's excess of di-muon events.

  • F. Abe, et al (CDF Collaboration), " Search for Gluino and Squark Cascade Decays at the Fermilab Tevatron Collider ", Phys. Rev. Lett. 76, 2006 - 2010 (1996).
    We report on a search for supersymmetry using dilepton events which complements the classic missing ET plus multijet analyses. Using 19 pb-1 of pp̅ collisions at sqrt[s] = 1.8 TeV recorded with the Collider Detector at Fermilab we have searched for squarks and gluinos decaying into charginos and producing events with two leptons. We observe one candidate event. In comparison, the expected number of background events from standard model processes is 2.390.63(stat)-0.42+0.77(syst). Hence we set limits on gluino and squark production based on predictions from the supergravity inspired minimal supersymmetric extension of the standard model.

  • B. Abbott, et al (D Collaboration), " Search for dilepton signatures from minimal low-energy supergravity in pp̅ collisions at sqrt[s]=1.8 TeV ", arXiv:hep-ex/9907048v2, Phys. Rev. D 63, 091102 (2001).
    We report on a search for supersymmetry using the D detector. The 1994–1996 data sample of sqrt[s]=1.8 TeV pp̅ collisions was analyzed for events containing two leptons (e or μ), two or more jets, and missing transverse energy. Assuming the minimal supergravity model, with A0=0 and μ<0, various thresholds were employed to optimize the search. No events were found beyond expectation from the background. We set a lower limit at the 95% C.L. of 255 GeV /c2 for equal mass squarks and gluinos for tan β=2, and present exclusion contours in the (m0,m1/2) plane for tan β=2–6.

  • D. Acosta, et al (CDF Collaboration), " Search for the Supersymmetric Partner of the Top Quark in Dilepton Events from pp̅ Collisions at sqrt[s]=1.8   TeV ", Phys. Rev. Lett. 90, 251801 (2003).

Trileptons signature

  • Anadi Canepa (CDF Collaboration), " Search for the associated production of chargino and neutralino in the final state with three leptons ", arXiv:hep-ex/0603032v1, SUSY 2005 (proceedings was not published), Durham, England, July 18-23, 2005.
    Supersymmetry, if realized in Nature, predicts the existence of new particles, as chargino and neutralino, which might manifest themselves with peculiar signatures. Three leptons and large missing transverse energy in the event could signal their associated production. We report the latest results of the search performed by the CDF Collaboration in proton-antiproton collisions at Tevatron Run II.

  • V. M. Abazov, et al (D0 Collaboration), " Search for Supersymmetry via Associated Production of Charginos and Neutralinos in Final States with Three Leptons ", arXiv:hep-ex/0504032v1, Phys. Rev. Lett. 95, 151805 (2005).
    A search for associated production of charginos and neutralinos is performed using data recorded with the D0 detector at a p[overline p] center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three charged leptons, of which at least two are electrons or muons. No evidence for supersymmetry is found in a data set corresponding to an integrated luminosity of 320 pb-1. Limits on the product of the production cross section and leptonic branching fraction are set. For the minimal supergravity model, a chargino lower mass limit of 117 GeV at the 95% C.L. is derived in regions of parameter space with enhanced leptonic branching fractions.

  • Abachi, S., et al (D0 Collaboration), " Search for W̃1Z̃2 Production via Trilepton Final States in pp̅ Collisions at sqrt[s] = 1.8 TeV ", Phys. Rev. Lett. 76, 2228 - 2233 (1996).
    We have searched for associated production of the lightest chargino W̃1 and next-to-lightest neutralino Z̃2 of the minimal supersymmetric standard model in pp̅ collisions at sqrt[s] = 1.8 TeV using the D0 detector at the Fermilab Tevatron collider. Data corresponding to an integrated luminosity of 12.50.7 pb-1 were examined for events containing three isolated leptons. No evidence for W̃1Z̃2 pair production was found. Limits on σ(W̃1Z̃2)B(W̃1→lνZ̃1)B(Z̃2→ll̅ Z̃1) are presented.

  • B. Abbott, et al (D0 Collaboration), " Search for Trilepton Signatures from Associated Gaugino Pair Production ", arXiv:hep-ex/9705015v1, Phys. Rev. Lett. 80, 1591 - 1596 (1998).
    We report on a search for the trilepton decay signature from the associated production of supersymmetric gaugino pairs, χ̃1χ̃20, within the context of minimal supersymmetric models that conserve R parity. This search uses 95 pb-1 of pp̅ data taken at sqrt[s] = 1.8 TeV with the D0 detector. No evidence of a trilepton signature has been found, and a limit on the product of cross section times branching fraction to trileptons is given as a function of χ̃1 mass.

  • F. Abe, et al (CDF Collaboration), " Search for Chargino-Neutralino Production in pp̅ Collisions at √s = 1.8 TeV ", Phys. Rev. Lett. 76, 4307 - 4311 (1996).
    We have searched for chargino-neutralino production (χ̃1χ̃20) in 1.8 TeV pp̅ collisions, followed by their leptonic decays χ̃1→χ̃10ℓν and χ̃20→χ̃10ℓ+ℓ-. These trilepton events are expected within a framework of the minimal supersymmetric standard model (MSSM). In a 19.1 pb-1 data sample collected with a Collider Detector at Fermilab, no trilepton events were observed. Upper limits on σ(pp̅ →χ̃1χ̃20)̇BR(χ̃1χ̃20→3ℓ+X) were obtained for various MSSM parameter space regions, yielding new 95% confidence level lower limits for the neutralino (χ̃20) mass which extend as high as 49 GeV /c2.

  • F. Abe, et al (CDF Collaboration), " Search for Chargino-Neutralino Associated Production at the Fermilab Tevatron Collider ", Phys. Rev. Lett. 80, 5275 - 5280 (1998).
    We have searched in pp̅ collisions at sqrt[s] = 1.8 TeV for events with three charged leptons and missing transverse energy. In the minimal supersymmetric standard model, we expect trilepton events from chargino-neutralino (χ̃1χ̃20) pair production, with subsequent decay into leptons. We observe no candidate e+e-e, e+e-μ, eμ+μ-, or μ+μ-μ events in 106 pb-1 integrated luminosity. We present limits on the sum of the branching ratios times cross section for the four channels: σχ̃1χ̃20B(χ̃1χ̃20→3ℓ+X)<0.34 pb, Mχ̃1>81.5 GeV /c2, and Mχ̃20>82.2 GeV /c2 for tanβ = 2, μ = -600 GeV /c2, and Mq̃ = Mg̃.

Jets + MET signature

  • V. M. Abazov, et al (D0 Collaboration), " Search for Squarks and Gluinos in Events with Jets and Missing Transverse Energy in pbarp Collisions at sqrt(s)=1.96 TeV ", arXiv:hep-ex/0604029v2, Physics Letters B, Volume 638, Issues 2-3, 6 July 2006, Pages 119-127.
    _ The results of a search for squarks and gluinos using data from ppbar collisions recorded at a center-of-mass energy of 1.96 TeV by the D0 detector at the Fermilab Tevatron Collider are reported. The topologies analyzed consist of acoplanar-jet and multijet events with large missing transverse energy. No evidence for the production of squarks or gluinos was found in a data sample of 310 pb-1. Lower limits of 325 and 241 GeV were derived at the 95% C.L. on the squark and gluino masses, respectively, within the framework of minimal supergravity with tan(beta)=3, A0=0, and mu<0._

  • B. Abbott, et al (D0 Collaboration), " Search for Squarks and Gluinos in Events Containing Jets and a Large Imbalance in Transverse Energy ", arXiv:hep-ex/9902013v2, Phys. Rev. Lett. 83, 4937 - 4942 (1999).
    Using data corresponding to an integrated luminosity of 79 pb-1, D0 has searched for events containing multiple jets and large missing transverse energy in pbar-p collisions at sqrt(s)=1.8 TeV at the Fermilab Tevatron collider. Observing no significant excess beyond what is expected from the standard model, we set limits on the masses of squarks and gluinos and on the model parameters m_0 and m_1/2, in the framework of the minimal low-energy supergravity models of supersymmetry. For tan(beta) = 2 and A_0 = 0, with mu < 0, we exclude all models with m_squark < 250 GeV /c^2. For models with equal squark and gluino masses, we exclude m < 260 GeV /c^2.

  • Abachi, S., et al (D0 Collaboration), " Search for Squarks and Gluinos at sqrt s = 1.8 TeV ", Phys. Rev. Lett. 75, 618 - 623 (1995).
    We present a search for events consistent with the production and decay of the squarks and gluinos of the minimal supersymmetric standard model (MSSM) in the D0 detector at the Fermilab Tevatron pp̅ collider. We examined data for events containing large missing transverse energy and three or more jets. We observed no excess of events above the expected yield from standard model processes. For a choice of MSSM parameter values, we set a lower limit at the 95% confidence level on the mass of the gluino of 144 GeV /c2 for all squark masses and a lower limit of 212 GeV /c2 for equal squark and gluino masses.

SM Backgrounds - Experiment and Theory

  • S. Abachi, , et al (D0 Collaboration), " Search for W Boson Pair Production in pp̅ Collisions at sqrt[s] = 1.8 TeV ", Phys. Rev. Lett. 75, 1023 - 1027 (1995).
    The results of a search for W boson pair production in pp̅ collisions at sqrt[s] = 1.8 TeV with subsequent decay to dilepton ( eμ,ee, and μμ) channels are presented. One event is observed with an expected background of 0.560.13 events with an integrated luminosity of approximately 14 pb-1. Assuming equal strengths for the WWZ and WWγ gauge boson coupling parameters κ and λ, limits on the CP-conserving anomalous coupling constants are -2.6<Δκ<2.8 and -2.1<λ<2.1 at the 95% confidence level.

  • S. Abachi, , et al (D0 Collaboration), " W and Z Boson Production in pp̅ Collisions at sqrt[s] = 1.8 TeV ", Phys. Rev. Lett. 75, 1456 - 1461, (1995).
    The inclusive cross sections times leptonic branching ratios for W and Z boson production in pp̅ collisions at sqrt[s] = 1.8 TeV were measured using the D0 detector at the Fermilab Tevatron collider: σWB(W→eν) = 2.360.070.13 nb, σWB(W→μν) = nb, σZB(Z→e+e-) = 0.2180.0110.012 nb, and σZB(Z→μ+μ-) = 0.1780.0300.009 nb. The first error is the combined statistical and systematic uncertainty, and the second reflects the uncertainty in the luminosity. For the combined electron and muon analyses we find σWB(W→lν)/σZB(Z→l+l-) = 10.900.49. Assuming standard model couplings, this result is used to determine the width of the W boson, γ(W) = 2.0440.093 GeV.

SUSY/BSM Papers - Theory and Phenomenology

  • Howard Baer (Florida State U.) , Xerxes Tata (Hawaii U. & Wisconsin U., Madison) , Jeffrey Woodside (Oklahoma State U.), " SEARCHING FOR 100-GeV - 300-GeV GLUINOS AT THE TEVATRON AND SSC ", FSU-HEP-881011, UH-511-662-88, OSU-RN-207, Oct 1988. 12pp. Contribution to Snowmass Summer Study, Snowmass, CO, Jun 27 - Jul 15, 1988.

  • H. Baer (Florida State U.) , Vernon D. Barger (Wisconsin U., Madison) , R.J.N. Phillips (Rutherford) , X. Tata (Hawaii U.), " Dileptons from Chargino and Stop Production at the Tevatron ", Physics Letters B Volume 220, Issues 1-2, 30 March 1989, Pages 303-307.
    Isolated opposite-sign dileptons with missing transverse momentum at the Tevatron pImage collider would indicate the production of new heavy particles. In addition to the top quark t and fourth-generation fermions, supersymmetry candidates would be charginos Image and the stop Image (scalar partner of the top quark). We evaluate and compare the signals from the above sources.

  • Howard Baer (Florida State U.) , Xerxes Tata (Hawaii U.) , Jeffrey Woodside (Oklahoma State U.), " Gluino Cascade Decay Signatures At The Tevatron Collider ", UH-511-677-89, FSU-HEP-890512, OSU-RN-215, May 1989. 41pp. Published in Phys. Rev. D 41, 906 - 915 (1990).
    As the search for gluinos is extended to higher masses, the gluino cascade decays through lighter gaugino species can no longer be neglected. We compare gluino-cascade-decay signatures with signatures from direct gluino decay to the lightest supersymmetric particle assumed to be massless at the Fermilab Tevatron collider, assuming mg̃<mq̃. Cascade decays yield a softer missing-pT (pT) spectrum which reduces the pT cross section by a factor of 2-3 for mg̃=100-150 GeV. However, new signatures characteristic of the cascade appear in the 0, 1, and 2 lepton plus jets plus pT channels. We examine these signatures and compare with dominant standard-model backgrounds.

  • R.Michael Barnett (LBL, Berkeley) , J.F. Gunion (UC, Davis) , Howard E. Haber (UC, Santa Cruz), " Like Sign Dileptons As A Signal For Gluino Production ", UCD-88-30, LBL-26204, SCIPP-88-36, Oct 1988. 9pp. To appear in Proc. of 1988 Summer Study on High Energy Physics in the 1990's, Snowmass, CO, Jun 27 - Jul 15, 1988. Published in Snowmass: DPF Summer Study 1988:0230.

  • R. Michael Barnett, John F. Gunion, Howard E. Haber, " Discovering Supersymmetry with Like-sign Dileptons ", arXiv:hep-ph/9306204v1, Physics Letters B, Volume 315, Issues 3-4, 7 October 1993, Pages 349-354.
    Supersymmetry may be discovered at hadron colliders by searching for events similar to the quark signal of two isolated leptons. In the case of gluino production, the most distinguishing feature is that in half the events the two leading leptons have the same sign. We demonstrate the remarkable sensitivity of this gluino signature at both the Fermilab Tevatron Collider and at the Superconducting Siper Collider. Techniques for approximately determining the gluino mass are discussed.

  • J.F. Gunion (U.C. Davis), C. Loomis (Rutgers), K.T. Pitts (FNAL), " Searching for Doubly-Charged Higgs Bosons at Future Colliders ", arXiv:hep-ph/9610237v1 (1996).
    Doubly-charged Higgs bosons ($\Delta^{--}/\Delta^{++}$) appear in several extensions to the Standard Model and can be relatively light. We review the theoretical motivation for these states and present a study of the discovery reach in future runs of the Fermilab Tevatron for pair-produced doubly-charged Higgs bosons decaying to like-sign lepton pairs. We also comment on the discovery potential at other future colliders.

  • Stephen P. Martin, James D. Wells, " Cornering gauge-mediated supersymmetry breaking with quasi-stable sleptons at the Tevatron ", arXiv:hep-ph/9805289v1, Phys. Rev. D 59, 035008 (1998).
    There are many theoretical reasons why heavy quasistable charged particles might exist. Pair production of such particles at the Fermilab Tevatron can produce highly ionizing tracks or fake muons. In gauge-mediated supersymmetry breaking, sparticle production can lead to events with a pair of quasistable sleptons, a significant fraction of which will have the same electric charge. Depending on the production mechanism and the decay chain, they may also be accompanied by additional energetic leptons. We study the relative importance of the resulting signals for the Tevatron run II. The relative fraction of same-sign tracks to other background-free signals is an important diagnostic tool in gauge-mediated supersymmetry breaking that may provide information about mass splittings, tan β, and the number of messengers communicating supersymmetry breaking.

  • Konstantin T. Matchev, Damien M. Pierce, " Supersymmetry reach of the Fermilab Tevatron via trilepton, like-sign dilepton, and dilepton plus tau jet signatures ", Phys. Rev. D 60, 075004 (1999).
    We determine the Fermilab Tevatron’s reach in supersymmetric parameter space in trilepton, like-sign dilepton, and dilepton plus tau-jet channels. We critically study the standard model background processes. We find larger backgrounds and, hence, significantly smaller reach regions than recent analyses. We identify the major cause of the background discrepancy. We improve signal-to-noise by introducing an invariant mass cut which takes advantage of a sharp edge in the signal dilepton invariant mass distribution. Also, we independently vary the cuts at each point in SUSY parameter space to determine the set which yields the maximal reach. We find that this cut optimization can significantly enhance the Tevatron reach.

  • Konstantin T. Matchev, Damien M. Pierce, " New backgrounds in trilepton, dilepton and dilepton plus tau jet SUSY signals at the tevatron ", arXiv:hep-ph/9907505v1, Physics Letters B Volume 467, Issues 3-4, 18 November 1999, Pages 225-231.
    We determine the Tevatron's reach in supersymmetric parameter space in trilepton, like-sign dilepton, and dilepton plus tau-jet channels, taking all relevant backgrounds into account. We show results for the minimal supergravity model. With a standard set of cuts we find that the previously unaccounted for Wγ* background is larger than all other backgrounds combined. We include cuts on the dilepton invariant mass and the W-boson transverse mass to reduce the Wγ* background to a reasonable level. We optimize cuts at each point in supersymmetry parameter space in order to maximize signal-to-noise.

  • Marianne Johansen, " R-hadron at ATLAS -Discovery Prospects and Properties ", arXiv:hep-ex/0701055v2 (2007).
    R-hadrons are massive, meta-stable particles predicted in several Super- symmetry scenarios. Studies exploring the discovery potential of R-hadrons at the ATLAS detector have mainly focused on gluino R-hadrons. These studies have shown that gluino R-hadrons should be discovered in early running of the LHC, that they are easily isolated by simple cuts and that their mass can be measured to an accuracy of a few percent.

  • F. del Aguila, J. A. Aguilar-Saavedra, R. Pittau, " Heavy neutrino signals at large hadron colliders ", arXiv:hep-ph/0703261v2 (2007).
    We study the LHC discovery potential for heavy Majorana neutrino singlets in the process pp -> W^+ -> mu+ N -> mu+ mu+ jj, plus its charge conjugate. With a fast detector simulation we show that, in contrast with previous claims, backgrounds involving two same-sign muons are not negligible and, moreover, they cannot be eliminated with simple sequential kinematical cuts. Using a likelihood analysis it is shown that, for heavy neutrinos coupling only to the muon, LHC has 5 sigma sensitivity for heavy neutrino masses up to 175 GeV. This reduction in sensitivity, compared to previous parton-level estimates, is driven by the ~10^2-10^3 times larger background. Approximate limits are also provided for other lepton number-violating final states, as well as for Tevatron. As a by-product of our analysis, heavy neutrino production has been implemented within the ALPGEN framework.



  • James Paul Done (Texas A-M), " Search for supersymmetry using like sign dilepton events at CDF ", FERMILAB-THESIS-1999-09, 1999. 169pp. Ph.D. Thesis (Advisor: Teruki Kamon).

  • Matthew Peter Worcester (UCLA), " Inclusive search for anomalous high-pT like-sign lepton pair production at the Fermilab Tevatron collider ", FERMILAB-THESIS-2004-05, 2004. 174pp. Ph.D. thesis (Advisor: David Saltzberg).


  • Adam Yurkewicz (Michigan State U.), " Search for evidence of supersymmetry in the like-sign dimuon channel at the D0 experiment ", FERMILAB-THESIS-2004-11, Aug 2004. 134pp. Ph.D. Thesis (Advisor: James Linnemann).


  • Scurlock, Bobby Joe (University of Florida), " Compact muon solenoid discovery potential for the minimal supergravity model of supersymmetry in single muon events with jets and large missing transverse energy in proton-proton collisions at center-of-mass energy 14 TeV ", Ph.D. Thesis (Advisor: Darin Acosta), 2006.

SUSY/BSM Reviews

  • Stephen P. Martin, " A Supersymmetry Primer ", arXiv:hep-ph/9709356v4 (1997, updated in 2006).
    I provide a pedagogical introduction to supersymmetry. The level of discussion is aimed at readers who are familiar with the Standard Model and quantum field theory, but who have had little or no prior exposure to supersymmetry. Topics covered include: motivations for supersymmetry, the construction of supersymmetric Lagrangians, supersymmetry-breaking interactions, the Minimal Supersymmetric Standard Model (MSSM), R-parity and its consequences, the origins of supersymmetry breaking, the mass spectrum of the MSSM, decays of supersymmetric particles, experimental signals for supersymmetry, and some extensions of the minimal framework.

  • Ian J R Aitchison, " Supersymmetry and the MSSM: An Elementary Introduction ", arXiv:hep-ph/0505105v1 (2005).
    These notes are an expanded version of a short course of lectures given for graduate students in particle physics at Oxford. The level was intended to be appropriate for students in both experimental and theoretical particle physics.The purpose is to present an elementary and self-contained introduction to SUSY that follows on, relatively straightforwardly, from graduate-level courses in relativistic quantum mechanics and introductory quantum field theory. The notation adopted, at least initially, is one widely used in RQM courses, rather than the `spinor calculus' (dotted and undotted indices) notation found in most SUSY sources, though the latter is introduced in optional Asides. There is also a strong preference for a `do-it-yourself' constructive approach, rather than for a top-down formal deductive treatment. The main goal is to provide a practical understanding of how the softly broken MSSM is constructed. Relatively less space is devoted to phenomenology, though simple `classic' results are covered, including gauge unification, the bound on the mass of the lightest Higgs boson, and sparticle mixing. By the end of the course students (readers) should be provided with access to the contemporary phenomenological literature.

  • R. Arnowitt, B. Dutta, T. Kamon, V. Khotilovich, " mSUGRA At A 500-GeV Linear Collider ", arXiv:hep-ph/0308159v1 (2003).
    A study is made of what SUSY signals would be observable for mSUGRA models in a 500-GeV linear collider. All current experimental bounds on the mSUGRA parameter space are imposed. For m_0 < 1 TeV (or alternately if the current g_\mu - 2 anomaly maintains) the only observable signals that remain are slepton pair production and neutralino production of {\tilde\chi^0_2}+{\tilde\chi^0_1}. Slepton pair production can occur for masses < 250 GeV which for the selectron and smuon pairs require tanbeta < 40. In this domain very accurate selectron and smuon masses could be measured. Light staus, \tilde\tau_1, with mass < 250 GeV can be pair produced for any tanbeta and the neutralino signal can be seen provided m_{1/2}<~400 GeV. However, the detection of these requires a much more complicated analysis due to the fact that the dark matter co-annihilation constraint requires that the \tilde\tau_1 and {\tilde\chi^0_1} mass difference be <~ 15 GeV. The point m_{1/2} = 360 GeV, A_0 = 0, \mu>0 is analyzed in detail, and it is shown that the stau and neutralino signals can be detected provided an active mask down to 2^o is used. However, large parts of the mSUGRA parameter space exists where a 500-GeV machine would not be able to see any SUSY signal.

  • Adel Bilal, " Introduction to Supersymmetry ", arXiv:hep-th/0101055v1 (2001).
    These are expanded notes of lectures given at the summer school "Gif 2000" in Paris. They constitute the first part of an "Introduction to supersymmetry and supergravity" with the second part on supergravity by J.-P. Derendinger to appear soon. The present introduction is elementary and pragmatic. I discuss: spinors and the Poincar\'e group, the susy algebra and susy multiplets, superfields and susy lagrangians, susy gauge theories, spontaneously broken susy, the non-linear sigma model, N=2 susy gauge theories, and finally Seiberg-Witten duality.

  • Philip Arygres, " An Introduction to Global Supersymmetry ", link (2001).

  • Michael E. Peskin, " Supersymmetry: the Next Spectroscopy ", arXiv:hep-ph/0212204v1 (2002).
    I describe the picture by which supersymmetry--the possible symmetry of Nature that converts fermions to bosons and vice versa--accounts for the next stage of physics beyond the Standard Model. I then survey the future experimental program implied by this theory, in which the spectrum of particles associated with supersymmetry will be determined with precision. [Invited lecture at the Werner Heisenberg Centennial Symposium, December, 2001.]

  • Hitoshi Murayama, " Supersymmetry Phenomenology ", arXiv:hep-ph/0002232v2 (2000).
    This is a very pedagogical review of supersymmetry phenomenology, given at ICTP Summer School in 1999, aimed mostly at students who had never studied supersymmetry before. It starts with an analogy that the reason why supersymmetry is needed is similar to the reason why the positron exists. It introduces the construction of supersymmetric Lagrangians in a practical way. The low-energy constraints, renormalization-group analyses, collider phenomenology, and frameworks of mediating supersymmetry breaking are briefly discussed.

  • Michael E. Peskin, " Beyond the Standard Model ", arXiv:hep-ph/9705479v1 (1997).
    These lectures constitute a short course in `Beyond the Standard Model' for students of experimental particle physics. I discuss the general ideas which guide the construction of models of physics beyond the Standard Model. The central principle, the one which most directly motivates the search for new physics, is the search for the mechanism of the spontaneous symmetry breaking observed in the theory of weak interactions. To illustrate models of weak-interaction symmetry breaking, I give a detailed discussion of the idea of supersymmetry and that of new strong interactions at the TeV energy scale. I discuss experiments that will probe the details of these models at future pp and e+e- colliders. [Lectures presented at the 1996 European School of High-Energy Physics.]

  • Joseph D. Lykken, " Introduction to Supersymmetry ", arXiv:hep-th/9612114v1 (1996).
    These lectures give a self-contained introduction to supersymmetry from a modern perspective. Emphasis is placed on material essential to understanding duality. Topics include: central charges and BPS-saturated states, supersymmetric nonlinear sigma models, N=2 Yang-Mills theory, holomorphy and the N=2 Yang-Mills beta function, supersymmetry in 2, 6, 10, and 11 spacetime dimensions.

  • Manuel Drees (APCTP, Seoul), " An Introduction to Supersymmetry ", arXiv:hep-ph/9611409v1 (1996).
    A fairly elementary introduction to supersymmetric field theories in general and the minimal supersymmetric Standard Model (MSSM) in particular is given. Topics covered include the cancellation of quadratic divergencies, the construction of the supersymmetric Lagrangian using superfields, the field content of the MSSM, electroweak symmetry breaking in the MSSM, mixing between different superparticles (current eigenstates) to produce mass eigenstates, and the embedding of the MSSM in so--called minimal supergravity.

  • M. Drees (Madison), S.P. Martin (Ann Arbor), " Implications of SUSY Model Building ", arXiv:hep-ph/9504324v1 (1995). Contribution to the DPF long range study, working group on 'Electroweak Symmetry Breaking and Beyond the SM Physics'.
    We discuss the motivations and implications of models of low-energy supersymmetry. We present the case for the minimal supersymmetric standard model, which we define to include the minimal particle content and soft supersymmetry-breaking interactions which are universal at the GUT or Planck scale. This model is in agreement with all present experimental results, and yet depends on only a few unknown parameters and therefore maintains considerable predictive power. From the theoretical side, it arises naturally in the context of supergravity models. We discuss radiative electroweak symmetry breaking and the superpartner spectrum in this scenario, with some added emphasis on regions of parameter space leading to unusual or interesting experimental signals at future colliders. We then examine how these results may be affected by various modifications and extensions of the minimal model, including GUT effects, extended gauge, Higgs, and matter sectors, non-universal supersymmetry breaking, non-conservation of R-parity, and dynamical supersymmetry breaking at low energies.

  • Fred Cooper, Avinash Khare, Uday Sukhatme, " Supersymmetry and Quantum Mechanics ", arXiv:hep-th/9405029v2, Physics Reports, Volume 251, Issues 5-6, January 1995, Pages 267-385 (1995).
    In the past ten years, the ideas of supersymmetry have been profitably applied to many nonrelativistic quantum mechanical problems. In particular, there is now a much deeper understanding of why certain potentials are analytically solvable and an array of powerful new approximation methods for handling potentials which are not exactly solvable. In this report, we review the theoretical formulation of supersymmetric quantum mechanics and discuss many applications. Exactly solvable potentials can be understood in terms of a few basic ideas which include supersymmetric partner potentials, shape invariance and operator transformations. Familiar solvable potentials all have the property of shape invariance. We describe new exactly solvable shape invariant potentials which include the recently discovered self-similar potentials as a special case. The connection between inverse scattering, isospectral potentials and supersymmetric quantum mechanics is discussed and multisoliton solutions of the KdV ? equation are constructed. Approximation methods are also discussed within the framework of supersymmetric quantum mechanics and in particular it is shown that a supersymmetry inspired WKB approximation is exact for a class of shape invariant potentials. Supersymmetry ideas give particularly nice results for the tunneling rate in a double well potential and for improving large N expansions. We also discuss the problem of a charged Dirac particle in an external magnetic field and other potentials in terms of supersymmetric quantum mechanics. Finally, we discuss structures more general than supersymmetric quantum mechanics such as parasupersymmetric quantum mechanics in which there is a symmetry between a boson and a para-fermion of order p.


  • P. M. R. Binetruy, Department of Physics, University of Paris, " Supersymmetry ", Book published by OUP (2007). Available on amazon.
    This book is an introduction to the theory of supersymmetry, which is a cornerstone to understanding the physics of elementary particles beyond the so-called "Standard Model". Supersymmetry is the first introductory book on this modern and increasingly popular subject.

  • Howard Baer and Xerxes Tata, " Weak Scale Supersymmetry ", Book published by Cambridge Press (2006). Available on amazon
    Supersymmetric models of particle physics predict new superpartner matter states for each particle in the Standard Model. These superpartners will have wide ranging implications, from cosmology to observations at high energy accelerators, such as CERN's LHC. In this text, the authors develop the basic concepts of supersymmetry and show how it can be incorporated into a theoretical framework for describing unified theories of elementary particles. They develop the technical tools of supersymmetry using four-component spinor notation familiar to high energy experimentalists and phenomenologists. The text takes the reader from an abstract formalism to a straightforward recipe for writing supersymmetric gauge theories of particle physics, and ultimately to the calculations necessary for practical applications at colliders and in cosmology. This is a comprehensive, practical and accessible introduction to supersymmetry for experimental and phenomenological particle physicists and graduate students. Exercises and worked examples that clarify the material are interspersed throughout. Develops very general supersymmetric models for the interactions of elementary particles from basic principles. Uses 4-component spinor notation to develop the superfield formalism (a necessary technical tool). Extensively treats the experimental implications of supersymmetry. Contains over 100 exercises and worked examples throughout the text.

  • Kane, G. L. and Shifman, M., " The Supersymmetric World: The Beginnings of the Theory ", Published by World Scientific, Available on amazon (2001).
    The story of the discovery of supersymmetry is a fascinating one, unlike that of any other major development in the history of science. This engaging book presents a view of the process, mainly in the words of people who participated. It combines anecdotal descriptions and personal reminiscences with more technical accounts of the trailblazers, covering the birth of the theory and its first years - the origin of the idea, four-dimensional field theory realization, and supergravity. The eyewitnesses convey to us the drama of one of the deepest discoveries in theoretical physics in the 20th century. This book will be equally interesting and useful to young researchers in high energy physics and to mature scholars - physicists and historians of science.

  • Weinberg, Steven, " The Quantum Theory of Fields, Volume 3: Supersymmetry ", Published by Cambridge University Press, Available on amazon (1999).
    Nobel Laureate Steven Weinberg continues his masterly exposition of quantum field theory. This third volume of The Quantum Theory of Fields presents a self-contained, up-to-date and comprehensive introduction to supersymmetry, a highly active area of theoretical physics that is likely to be at the center of future progress in the physics of elementary particles and gravitation. The text introduces and explains a broad range of topics, including supersymmetric algebras, supersymmetric field theories, extended supersymmetry, supergraphs, nonperturbative results, theories of supersymmetry in higher dimensions, and supergravity. A thorough review is given of the phenomenological implications of supersymmetry, including theories of both gauge and gravitationally-mediated supersymmetry breaking. Also provided is an introduction to mathematical techniques, based on holomorphy and duality, that have proved so fruitful in recent developments. This book contains much material not found in other books on supersymmetry, some of it published here for the first time. Problems are included.

  • Georg Junker, " Supersymmetric Methods in Quantum and Statistical Physics ", Published by Springer, Available on amazon (1996).
    This book gives an introduction to supersymmetric quantum mechanics and a comprehensive review of its applications in quantum and statistical physics. The classical version and the quantum version of Witten's model are studied in detail. Exact spectral properties of the model for the so-called shape invariant potentials are discussed. The quasi-classical quantization rules are derived. The topics covered also include the supersymmetric structure of a classical stochastic dynamical system obeying the Langevin or the Fokker-Planck equation, Pauli's Hamiltonian and its application to the paragmagnetism of a non-interacting electron gas in two and three dimensions, supersymmetry of Dirac's Hamiltonian, and others. The book addresses graduate students as well as scientists.

  • Wess, Julius, and Jonathan Bagger, " Supersymmetry and Supergravity ", Published by Princeton University Press, Available on amazon (1992).
    This widely acclaimed introduction to N = 1 supersymmetry and supergravity is aimed at readers familiar with relativistic quantum field theory who wish to learn about the supersymmetry algebra. In this new volume Supersymmetry and Supergravity has been greatly expanded to include a detailed derivation of the most general coupling of super-symmetric gauge theory to supergravity. The final result is the starting point for phenomenological studies of supersymmetric theories. The book is distinguished by its pedagogical approach to supersymmetry. It develops several topics in advanced field theory as the need arises. It emphasizes the logical coherence of the subject and should appeal to physicists whose interests range from the mathematical to the phenomenological. In praise of the first edition: "A beautiful exposition of the original ideas of Wess and Zumino in formulating N = 1 supersymmetry and supergravity theories, couched in the language of superfields introduced by Strathdee and the reviewer.... [All] serious students of particle physics would do well to acquire a copy."--Abdus Salam, Nature "An excellent introduction to this exciting area of theoretical physics."--C. J. Isham, Physics Bulletin

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