SusyCSCNotesFigures

Introduction

This page contains the figures from the SUSY chapter of the CSC book.

Data-driven top/W/Z background estimations

Figure 1

The missing transverse energy (top) and effective mass (bottom) distributions for the background processes and for an example SUSY benchmark point (SU3) in the one-lepton mode for an integrated luminosity of 1 inverse femtobarn. The black circles show the SUSY signal. The black full histogram shows the sum of all Standard Model backgrounds; also shown in different colours are the various components of the background.

Figure 2

The missing transverse energy distribution for top quark-pairs (top) and SUSY (SU3, bottom) signal. In both figures, the solid and dashed histograms show the missing transverse energy distribution for transverse mass larger than 100 GeV and less than 100 GeV, respectively. The numbers are normalized to 1 inverse femtobarn.

Figure 3

The missing transverse energy (top) and effective mass (bottom) distributions of the background processes for the one-lepton mode with an integrated luminosity of 1 inverse femtobarn. The open circles show the estimated distributions with the MT method. The black full histogram shows the true sum of all Standard Model backgrounds; different symbols show the various contributions to the background.

Figure 4

The missing transverse energy distribution of the background processes for the one-lepton mode with an integrated luminosity of 1 inverse femtobarn. The red dots show the estimated distributions with the MT method, with SUSY signal (SU3) present. The black full histogram shows the sum of all Standard Model backgrounds, and the OPEN histogram shows the SUSY signal (SU3).

The transverse mass distributions of the various SUSY signals (SU1, SU2 and SU3) with an integrated luminosity of 1 inverse femtobarn. Background processes are superimposed for comparison. The black full histogram shows the sum of all Standard Model backgrounds.

Figure 5

The missing transverse energy (top) and effective mass (bottom) distributions of the background processes for one lepton mode with an integrated luminosity of 1 inverse femtobarn. The red dots show the estimated distributions with the new MT method. The black full histogram shows the sum of all Standard Model backgrounds. The open circles indicate the SUSY (SU3) signal.

Figure 6

Normalized distributions for reconstructed mass of the top quark with leptonic W-decay (top), reconstructed mass of the hadronically decaying W (middle), and reconstructed mass of the top quark with hadronic W-decay (bottom), for top quark-pair production, W plus jets events, and SU3 SUSY events, using the topbox method.

Figure 7

Distribution of the number of b-jet pairs for events passing the control sample requirements in the kinematic reconstruction method. The fraction of di-leptonic top events with no b-jet pairs is dominated by events with at least one b-jet which is not among the three highest-pT jets.

Distribution of missing transverse energy for di-leptonic top events with one tau lepton and events with a misidentified lepton compared to the estimation from resimulated events with an integrated luminosity of 1 inverse femtobarn. The requirement on the number of b-jet pairs is not applied to the resimulated events. The distribution of all di-leptonic top events is also shown.

Figure 8

The missing transverse energy (top) and effective mass (bottom) distributions for the estimated and true di-leptonic top contribution for the one-lepton SUSY search. Black points (red curve) represent the estimation without (with) the presence of a signal from SUSY (SU3).

Figure 9

Reconstructed missing transverse energy distribution in lepton+jet top quark-pair events with transverse mass larger than 100 GeV at Monte Carlo truth level. Top plot: as a function of truth leading-jet pT. Bottom plot: as a function of truth second-leading jet pT.

Figure 10

Top plot: Points: Predicted missing transverse energy significance distribution in a top quark-pair plus W + jets events sample. Histogram: actual missing transverse energy significance distribution. Bottom plot: Predicted HT2 distribution in the same sample. Histogram: actual HT2 distribution.

Figure 11

Histogram: observed missing transverse energy significance distribution for the sum of top quark-pair plus W + jets background plus SUSY signal. Open circles: SUSY signal. Blue triangles: true top quark-pair plus W + jets background. Black filled circles: estimated background. The SUSY signal shown here is the _1 TeV SUSY_ point.

Open circles: true SUSY signal as a function of missing transverse energy significance. Black: estimated SUSY yield, obtained from the difference of the observed missing transverse energy significance distribution minus the estimated background distribution.

Figure 12

Distributions of lepton-jet invariant mass values for various different Standard Model backgrounds and SUSY signal. The histograms show distributions of `data' events selected with the di-leptonic top selection. The data-points show the equivalent distribution estimated with redecay simulation, normalised to the peak.

Figure 13

Missing transverse energy (top) and effective mass (bottom) distributions of events passing the basic one-lepton SUSY selection cuts. Note that Z+jet and W+jet backgrounds are under-represented in these plots for missing transverse energy less than 80 GeV or effective mass less than 350 GeV due to filter requirements applied to the respective Monte Carlo samples.

Figure 14

Distributions in missing transverse energy (left), transverse mass (center) and reconstructed hadronic top mass (right) of single-lepton top quark-pairs (top row), di-leptonic top-pairs (second row), W + jet events (third row) and SUSY SU3 (bottom row). Each distribution is overlaid with a projection of the three-dimensional model that is fitted to that sample.

Figure 15

Distribution of missing transverse energy (left), transverse mass (center) and reconstructed hadronic top mass (right) of a 1-inverse-femtobarn mix of top quark-pairs, W plus jets events, and SUSY SU3 events overlaid with projections of the combined model on these observables that was fitted to this mix of events with floating yield parameters and floating shape parameters. For each projection the contributions of the one-lepton top quark-pair contribution (dark blue), di-lepton top quark-pair contribution (light blue), W+jet contribution (red) and ansatz SUSY constribution (black) are shown.

Figure 16

The missing transverse energy (top) and effective mass distributions (bottom) of the SUSY signal and background processes for the no-lepton mode with an integrated luminosity of 1 inverse femtobarn. The open circles show the SUSY signal (SU3 point). The shaded histogram shows the sum of all Standard Model backgrounds; different symbols show the various components.

Figure 17

Top plot: missing transverse energy distribution after all corrections for Z bosons decaying to neutrino pairs, electron-positron (and e+X) pairs, and muon pairs. The number of events corresponds to an integrated luminosity of 1 inverse femtobarn. The corrections take into account the different branching ratios, and fiducial, kinematic, and lepton identification factors. Bottom plot: effective mass distribution for the same physics processes.

Figure 18

The estimated distributions of missing transverse energy and the effective mass of the top quark-pairs, W + jets and QCD backgrounds in the no-lepton mode with a luminosity of 1 inverse femtobarn. In the two top plots, no SUSY signal is present in the data, and black/red histograms show the true/estimated (MT method) background distributions. In the other four plots, a SUSY SU3 signal is present in the data, and the blue histograms show the background plus the SUSY signal. In the two middle plots, no correction was applied. In the two bottom plots, a correction with the new MT method was performed.

Figure 19

Distribution of the missing transverse energy of top quark-pair events with one hadronic tau decay, for (circles) top quark-pair selection as in this analysis (control sample), and (squares) for the SUSY no-lepton mode selection.

Data-driven QCD background estimations

Figure 1

<met/sqrt(Sigma ET> vs. etaj, where j is the first or second highest-pT jet in each event (points). The non-fiducial regions selected with a cut at 0.95 (dashed line) are also shown (shaded areas; see text). These regions correspond to the LAr barrel-endcap and HEC-forward transition regions.

Figure 2

The |Deltaphi(j1,MET)| - |Deltaphi(j2,MET)| plane for QCD multijet (top) and SUSY SU3 events (bottom) passing SUSY jet cuts and MET > 100GeV.

Figure 3

The Deltaphi(min) distribution for QCD multijet (solid line) and SU3 SUSY (dashed line) events passing the SUSY jet cuts and with MET > 100 GeV, as described in the text. Good discrimination is achieved with a cut at Deltaphi(min) = 0.2 (vertical dotted line).

Figure 4

Up-minus-down timing distribution in TileCal for a simulated Monte Carlo di-jet sample. As expected, the distribution peaks near 0. NB Figure is rotated!

Figure 5

Up-minus-down timing distribution in TileCal for a simulated Monte Carlo cosmic ray sample. As expected, the distribution peaks near -18 ns. NB Figure is rotated!

Figure 6

The Meff distribution for simulated QCD events satisfying SUSY jet cuts described in Section 1. The top plot shows the number of events per bin, scaled to 1 fb-1 and the bottom plot shows the fractional difference with respect to CTEQ6.1M. In each case, the solid histogram and shaded band shows the results from the CTEQ6.1M proton PDF. The dashed and dotted histograms show the results from the MRST2004 and CTEQ6L1 PDFs, respectively. The error bars reflect the Monte Carlo statistics.

Figure 7

The Meff distribution for simulated QCD events satisfying SUSY jet cuts described in Section 1. The top plot shows the number of events per bin and the bottom plot shows the fractional uncertainty with respect to the PYTHIA -- ATLAS default model for the underlying event. In each plot, the solid histogram shows the results from the PYTHIA -- ATLAS default, the dotted histogram shows PYTHIA -- Tune A, the dashed histogram shows PYTHIA -- no MPI and the dot-dashed histogram shows JIMMY -- ATLAS default. The error bars reflect the Monte Carlo statistics.

Figure 8

The Meff distribution for simulated QCD events satisfying SUSY jet cuts described in Section 1. The top plot shows the number of events per bin and the bottom plot shows the fractional uncertainty with respect to the central prediction. The shaded bands show the estimated uncertainty on the observable for assumed JES uncertainties of 10 % (light), 5 % (medium-light), 3 % (medium) and 1 % (dark).

Figure 9

The pT distributions of the four highest-pT jets; (a) the leading, (b) the second (c) the third and (d) the fourth jet for PYTHIA (open circles) and ALPGEN (open histogram) events.

Figure 10

(a) ATLFAST met distribution for PYTHIA(circles) and ALPGEN (histogram) and (b) the relative difference (N(PYTHIA)-N(ALPGEN))/N(ALPGEN) of the met distributions. The shaded band is the Monte Carlo statistical error.

Figure 11

(a) ATLFAST Meff distribution for PYTHIA(circles) and ALPGEN (histogram) and (b) the relative difference (N( PYTHIA)-N(tt ALPGEN))/N(ALPGEN) of the Meff distributions. The shaded band is the Monte Carlo statistical error.

Figure 12

Event by event difference in number of jets between full GEANT4 simulation and PJTF (blue,solid) and between full GEANT4 simulation and ATLFAST (red,dashed). The top plot is for 140 GeV < pT < 280 GeV events, and the bottom one is for 560 GeV < pT < 1120 GeV events.

Figure 13

Top: distributions of the scalar pT sum of the four leading jets in PJTF (black, solid), ATLFAST (red, solid) and fully GEANT4 simulated jets (blue, points). The top plot is for 140 GeV < pT < 280 GeV events, and the next plot is for 560 GeV < pT < 1120 GeV. Bottom: the ratio with respect to the fully GEANT4 simulated jets.

Figure 14

Fake MET distributions from ATLFAST (red hatched), PJTF technique (black, solid) and full GEANT4 simulation (blue, points). Also shown with the dashed green line is the PJTF distribution without soft-jet correction. The top plot is for 140 GeV < pT < 280 GeV events, and next plot is for 560 GeV < pT < 1120 GeV. Bottom plots are the ratio of each distribution with respect to the full GEANT4 simulation.

Figure 15

MET (top) and Meff (bottom) distributions of 560 < pT < 2240 GeV PYTHIA QCD jet events simulated with ATLFAST (light/red solid), the PJTF technique (dark/black, solid) and full GEANT4 simulation (points). Events were required to pass the SUSY jet cuts described in Section 1.

Figure 16

Reconstructed jet multiplicity (top) and highest jet pT (bottom) for PYTHIA dijet samples simulated with different options. The statistical uncertainty only is shown for the full simulation sample.

Figure 17

Leading jet pT resolution (top) and MET (bottom) for PYTHIA dijet samples simulated with different options. The statistical uncertainty only is shown for the full simulation sample.

Figure 18

Transverse sphericity (top) and Meff (bottom) for PYTHIA dijet samples simulated with different options. The statistical uncertainty only is shown for the full simulation sample.

Figure 19

Standard deviations of Gaussian fits to measured response distributions vs. pT^gamma. The fit is of the functional form sigmaR(pT) = A + B*pT^-1/2 + C*pT^-1.

Figure 20

Top -- smearing function for a jet of 250 GeV (thick line), with Gaussian and non-Gaussian components (right and top facing hatches respectively) shown separately. Bottom -- dijet balance distribution (points) compared with the equivalent estimated distribution obtained from the jet response function to provide a `closure test' of the technique. Also shown are a Gaussian fit to the region 0.8 < R3(j) < 1.15 (thick line), and the non-Gaussian tail distribution (dashed histogram) measured with `Mercedes' events normalised to the tail of the dijet balance distribution.

Figure 21

MET (top) and Meff (bottom) distributions for smeared events and GEANT4 `data' passing 0-lepton SUSY jet cuts. Also included for comparison are 23.8 pb^-1 of SUSY (SU3) and the summed contribution from Z->nunubar + jets, Wlnu + jets and ttbar + jets.

Figure 22

Points: MET distribution for the non-isolated lepton sample. Histogram: MET distribution for the isolated lepton sample. The two distributions have been normalized to the same area in the region MET=[10,20] GeV.

Figure 23

Top: distribution of the effective mass in the bbbar+jets sample after the jet and lepton selection cuts. Bottom: MET distributions for ttbar isolated muon sample (black filled circle), ttbar non-isolated muon sample (red filled square), W+jets isolated muon sample (black open circle), W+jets non-isolated muon sample (black open square), bbbar isolated muon sample (blue open triangle), bbbar non-isolated muon sample (magenta filled triangle).

Figure 24

Black circles: MET distribution for ttbar plus W+jets samples where the lepton is non-isolated (ET^cone=[10,20] GeV). Histogram: MET distribution for ttbar plus W+jets samples with isolated leptons (ET^cone<10 GeV).

Prospects for SUSY discovery based on inclusive searches

Figure 1

Meff distribution for events surviving successive selection cuts: cut 1 (1st from top), cut 2 (2nd from top), and cuts 3-5 (3rd from top). The open circles represent point SU3, and the different background contributions are shown according to the legend. The last plot (4th from top) show all of the SUSY benchmark points and the total Standard Model background after cuts 1-5. Open circles represent the SUSY SU3 signal as predicted by Monte Carlo simulation, while the shaded area shows the total Standard Model background.

Figure 2

Meff distribution for the 0-lepton plus 2-jet analysis, after final cuts. Top: The open circles show the SUSY (SU3) signal Monte Carlo prediction, while the total Standard Model background is shown by the shaded histogram. The individual background contributions are shown by the points, as described in the legend. Bottom: The points show the distribution of the signal for a number of SUn points.

Figure 3

Expected Meff distributions after Cuts 1-4 (top), and Cut 6 (Bottom) for the 1-lepton analysis.

Figure 4

The Meff distributions for each of the SUn benchmark points, and for the sum of the Standard Model backgrounds with 1 fb-1 for the 1-lepton analysis. All the cuts except on Meff are applied

Figure 5

Meff distribution for events with one lepton and: 2 jets (top) or 3 jets (bottom) after all cuts were applied.

Figure 6

Significance of signal events for the four benchmark points, as a function of the cut on transverse missing energy (top) and the transverse momentum of the leading jet (bottom), for an integrated luminosity of 1 fb-1

Figure 7

MissingEt in the same sign dilepton events after all cuts except the MissingEt cut.

Figure 8

The Meff distributions for SUSY signals and Standard Model backgrounds in the tau analysis after Cuts 4, 5, 6, and 7

Figure 9

Meff distributions for b-jet analysis. Top: Standard Model backgrounds. Bottom: SUSY signals with total background.

Figure 10

Efficiencies for electrons as a function of pT for the SU3 sample (top) and eta for the ALPGEN sample Z->ee (bottom). The solid red line corresponds to the Geant 4 simulation, the solid circles to uncorrected ATLFAST, and the open circles to the corrected version of ATLFAST used for the reach analyses.

Figure 11

The 1 fb-1 5-sigma reach contours for the 4-jet plus MissingEt analyses with various lepton requirements for mSUGRA as a function of m_0 and m_1/2 Top: tanbeta=10. Bottom tanbeta=50. The horizontal and curved grey lines indicate gluino and squark mass contours respectively in steps of 500 GeV.

Figure 12

The 1 fb-1 5-sigma reach contours for the 0-lepton and 1-lepton plus MissingEt analyses with various jet requirements as a function of m_0 and m_1/2 for the tanbeta=10 mSUGRA scan. The horizontal and curved grey lines indicate the gluino and squark masses respectively in steps of 500 GeV.

Figure 13

Reach for the 'random with constraints' mSUGRA scan plotted in the (m(squark),m(gluino)) plane. Solid triangles represent points which are observable (Z_n>5) with 1 fb-1, while open triangles show points which are not.

Figure 14

The 1 fb-1 reach for NUHM models with 4 jets, 0 or 1 leptons, and MissingEt. The masses fot NUHM are similar to the ones shown in Figure 11.

Figure 15

The 1 fb-1 5-sigma reach contours of the 2-lepton and 3-lepton analyses for the GMSB scan. The vertical solid and dashed grey lines indicate the gluino and squark masses respectively in steps of 500 GeV.

Exclusive measurements for SUSY events

Figure 1

Distribution of the invariant mass of same flavour and different flavour lepton pairs for the SUSY benchmark points and backgrounds after the cuts optimized from data in the presence of the SU3 signal. The integrated luminosity is 1 fb-1.

Distribution of the invariant mass of same flavour and different flavour lepton pairs for the SUSY benchmark points and backgrounds after the cuts optimized from data in the presence of the SU4 signal. The integrated luminosity is 0.5 fb-1.

Figure 2

Distribution of invariant mass after flavour subtraction for the SU3 benchmark point with an integrated luminosity of 1 fb-1. The line histogram is the Standard Model contribution while the points are the sum of Standard Model and SUSY contributions. The fitting function is superimposed and the expeccted position of the endpoit is indicated by a dashed line.

Distribution of invariant mass after flavour subtraction for the SU4 benchmark point with an integrated luminosity of 0.5 fb-1. The line histogram is the Standard Model contribution while the points are the sum of Standard Model and SUSY contributions. The fitting function is superimposed and the expeccted position of the endpoit is indicated by a dashed line.

Figure 3

Distribution of invariant mass after flavour subtraction for the SU1 benchmark point with an integrated luminosity of 1 fb-1. The line histogram is the Standard Model contribution while the points are the sum of Standard Model and SUSY contributions. The fitting function is superimposed and the expeccted position of the endpoit is indicated by a dashed line.

Distribution of invariant mass after flavour subtraction for the SU1 benchmark point with an integrated luminosity of 18 fb-1. The line histogram is the Standard Model contribution while the points are the sum of Standard Model and SUSY contributions. The fitting function is superimposed and the expeccted position of the endpoit is indicated by a dashed line.

Figure 4

Efficiency-corrected flavour-subtracted distributions of mllq for SU3 for 1 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Efficiency-corrected flavour-subtracted distributions of mllq for SU4 for 0.5 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Efficiency-corrected flavour-subtracted distributions of mllqthr for SU3 for 1 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Efficiency-corrected flavour-subtracted distributions of mllqthr for SU4 for 0.5 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Figure 5

Efficiency-corrected flavour-subtracted distributions of m_lq^high for SU3 for 1 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Efficiency-corrected flavour-subtracted distributions of m_lq^high for SU4 for 0.5 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Efficiency-corrected flavour-subtracted distributions of m_lq^low for SU3 for 1 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Efficiency-corrected flavour-subtracted distributions of m_lq^low for SU4 for 0.5 fb-1 of integrated luminosity. The points with error bars show SUSY plus Standard Model, the solid histogam shows the Standard Model contribution alone. The fitted function is superimposed, the vertical line indicates the theoretical endpoint value.

Figure 6

Invariant mass distribution of opposite-sign tau pairs with same-sign tau distribution subtracted, for the SU1 (18 fb-1, left) and SU3 scenarios (1 fb-1, right). The dashed histogram in the left plot shows the distribution at the generator level, while points show the reconstruction-level distribution.

Figure 7

Calibration curve showing the relation between the position of the inflection point (measured and fitted with function Eq. (12) after ATLFAST based detector simulation) and the endpoint (calculated with equation Eq. (5)) of the di-tau mass distribution. The SU3 point is not included.

Figure 8

Di-tau invariant mass spectrum for t! pnt decays as obtained from Monte Carlo truth information together with the expectation from theory. Right: Di-tau invariant mass spectrum for all hadronic decays after an ATLFAST based detector simulation. Both plots show the mass distributions for the chirality states LL, RR and LR=RL.

Figure 9

Fit of the sum of the reconstructed mT2 distributions in the selected SUSY and the remaining Standard Model background events with 1 fb-1 for SU3 and 0.5 fb-1 for SU4.

Figure 10

Left: Reconstructed mtb distributions in signal and SUSY combinatorial background events. Right: The 5 parameters fit of the sum of the reconstructed mtb distributions in signal and the remaining Standard Model events after the subtraction of the SUSY combinatorial background; all at 200 pb-1.

Figure 11

Invariant mass of the selected b-jet pairs (left) and invariant mass of the system consisting of the Higgs plus the jet minimising mhq (right) for 10 fb-1 of integrated luminosity.

Figure 12

Two-dimensional Markov chain likelihood maps for mSUGRA parameters M0 and M1=2 (left) as well as tan b and A0 (right) for sign m= +1, for benchmark point SU3, with integrated luminosity of 1 fb-1. The crosses indicate the actual values of the parameters for that benchmark point.

Figure 13

Distributions of the mSUGRA parameters obtained with the fits to pseudo-experiment results.

Searches with three leptons and missing transverse momentum

Figure 1

The SU2 sparticle mass spectrum

Figure 2

The efficiency for electrons (a,b) and muons (c,d) to be reconstructed and to pass various isolation criteria, for the SU2 sample. The plots are shown as a function of the pT (a,c) and eta (b,d) of the matched Monte Carlo lepton.

Figure 3

The fake rate for electrons (a,b) and muons (c,d) in the ttbar sample as function of the pT (a,c) and eta (b,d) of the fake lepton.

Figure 4

Transverse momentum of the leading three leptons (a-c) and leading-jet pT (d) after an initial three-lepton requirement has made.

Figure 5

Track isolation variable (max pT, DR=0.2) for (a) electrons and (b) muons.

Figure 6

(a) OSSF dilepton invariant mass distribution. (b) ETmiss distribution after the Z mass window cut. (c) The pT distribution of the leading jet after the ETmiss cut is applied.

Figure 7

Distributions of the OSSF dilepton invariant mass after all selections have been applied (a) without the jet veto and (b) including a jet veto.

Signatures with high-pT photons or long-lived heavy particles.

Figure 2 The g55 event filter trigger efficiency (see text) for the GMSB1 sample as a function of the reconstructed pT of the leading photon

Figure 3 Distributions after preselection for 1fb-1. Left: Missing transverse energy. Right: Effective mass for signal and Standard Model background

Figure 4 Distributions after preselection for 1fb-1: Number of reconstructed photons with pT >20 GeV and |eta| < 2.5 (left) and transverse momentum of the leading photon for signal and Standard Model background (right)

Figure 5 Signal distributions for full and fast simulation: a) effective mass, b) transverse momentum of the leading photon

Figure 6 5sigma discovery potential contour lines for GMSB SUSY in the Lambda - tan beta plane for different integrated luminosities

Figure 8 Left: The distributions of the decaylength of the neutralino in the z direction. Right: The transverse momentum of the photons they produce

Figure 9 Reconstruction efficiency as a function of Delta eta for the GMSB2 and GMSB3 samples

Figure 10 Photon identification cut efficiencies as a function of neutralino decay length in Z

Figure 11 Fitted slope parameters of the projected intersection distributions versus mean neutralino lifetime from the custom-built Monte Carlo simulation for an integrated luminosity of 30 fb-1

Figure 12 The measured cluster time as a function of the generated neutralino lifetime, for individual neutralinos in the Monte Carlo samples

Figure 13 Transverse momentum and velocity spectra for sleptons and accompanying leptons from the GMSB5 sample

Figure 14 The efficiency, as a function of b , for all slepton hits in the muon trigger chambers to be included in the same BC with fast particles, for the barrel (right)and the endcap (left)

Figure 15 The beta measured for sleptons in the barrel at L2 for different values of true beta . The error bar represents the fitted sigma of the measured beta distribution

Figure 16 Mass distribution of signal and background resulting from the L2 selection for an integrated luminosity of 500 pb-�1. The shaded area is the GMSB5 signal, the dashed line is the muon background, and the full line is the sum

Figure 17 The efficiency to reconstruct sleptons as muons as a function of b for two ATLAS muon reconstruction packages

Figure 18 beta resolution and reconstructed mass for sleptons from the GMSB5 sample

Figure 20 Distributions of transverse momenta dn / dpT of hard tracks (pT > 50 GeV) as reconstructed in the ID (left) and muon (right) system. The top, middle, and bottom plots show tracks from R_gluino, R_stop, and background events, respectively. As labelled, R-hadron spectra are scaled according to R-hadron mass. The spectra correspond to an equivalent integrated luminosity of 1fb-�1

Figure 21 Ratio of the number of high to low threshold hits in the TRT (top left); distance between a R-hadron candidate and a jet (top right); cosine of the angle between two high pT tracks in the muon system (bottom left); and cosine of the angle between high pT tracks in the ID and muon systems (bottom right). Distributions are shown for R_gluino hadrons of mass 1000 GeV and three background sources

Figure 22 Distributions of q(ID) * pT(ID) / q(mu) * pT(mu) for R_gluino (left) and R_stop hadrons (right). Predictions for a range of R-hadron masses are shown

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Major updates:
-- PaulDeJong - 18 Dec 2008

Responsible: PaulDeJong
Last reviewed by: Never reviewed