Search for supersymmetry in events with photons and low missing transverse energy (SUS-12-014)

Abstract

Many supersymmetric and exotic models of new physics predict production of events with low missing transverse energy and many energetic final-state objects, including electroweak gauge bosons. The Stealth Supersymmetry model yields this signature while conserving R-parity by means of a new hidden sector in which supersymmetry is approximately conserved. We present results of a general search for new physics in events with two photons and four or more hadronic jets produced in proton-proton collisions at √s=7 TeV with no requirement on missing transverse energy. The study is based on a data sample corresponding to 4.98/fb of integrated luminosity collected with the CMS detector in 2011. We observe no excess over the standard model expectation, and interpret this observation as a lower limit on the squark mass in the framework of Stealth Supersymmetry. We exclude squark masses less than 1430 GeV at the 95% confidence level. This is the first study of its kind.

Approved Plots from SUS-12-014 (click on plot to get .pdf)

Figure Caption
limit summary Figure 1: Decay of a squark in stealth SUSY.
limit summary Figure 2a: ST spectra from the photon + jets data control sample, area-normalized for ST > 800 GeV. We show the spectra for events with two, three, four, and five or more jets along with the n-jet / 2-jet ratio where n = 3, 4, or >= 5.
limit summary Figure 2b: ST spectra from the photon + jets data control sample, area-normalized for ST > 800 GeV. We show the spectra for events with two and three or more jets along with the >= 3-jet / 2-jet ratio.
limit summary Figure 3: Observed ST spectrum, background expectation with systematic uncertainty, and predicted signal for a squark mass of 900 GeV in events with four or more jets.
limit summary Figure 4a: Model-independent limit at the 95% CL on the product of the acceptance and cross section for events with four or more jets. We show the observed limits, median expected limits, and a band corresponding to +/- 1 SD on the median expected limits.
limit summary Figure 4b: Model-independent limit at the 95% CL on the product of the acceptance and cross section for events with five or more jets. We show the observed limits, median expected limits, and a band corresponding to +/- 1 SD on the median expected limits.
limit summary Figure 5: Stealth SUSY cross-section limit at the 95% CL as a function of squark mass. We show the observed limit, median expected limit, and a band corresponding to +/- 1 SD on the median expected limits. We also show the predicted NLO + NLL cross section from stealth SUSY with a band denoting +/- 1 SD from theoretical uncertainty.
Figure 6 : 3D view for event number 1. Photon 1 pT = 853 GeV, photon 2 pT = 66 GeV, ST = 1804 GeV, MET = 54 GeV, 2 jets. (Please find descriptions of the events in the event displays in AN-12-127.)
Figure 7 : Lego view for event number 1. Photon 1 pT = 853 GeV, photon 2 pT = 66 GeV, ST = 1804 GeV, MET = 54 GeV, 2 jets.
Figure 8 : rho-phi view for event number 1. Photon 1 pT = 853 GeV, photon 2 pT = 66 GeV, ST = 1804 GeV, MET = 54 GeV, 2 jets.
Figure 9 : 3D view for event number 2. Photon 1 pT = 146 GeV, photon 2 pT = 32 GeV, ST = 1418 GeV, MET = 45 GeV, 5 jets.
Figure 10 : Lego view for event number 2. Photon 1 pT = 146 GeV, photon 2 pT = 32 GeV, ST = 1418 GeV, MET = 45 GeV, 5 jets.
Figure 11 : rho-phi view for event number 2. Photon 1 pT = 146 GeV, photon 2 pT = 32 GeV, ST = 1418 GeV, MET = 45 GeV, 5 jets.
Figure 12 : 3D view for event number 3. Photon 1 pT = 275 GeV, photon 2 pT = 45 GeV, ST = 1403 GeV, MET = 63 GeV, 7 jets.
Figure 13 : Lego view for event number 3. Photon 1 pT = 275 GeV, photon 2 pT = 45 GeV, ST = 1403 GeV, MET = 63 GeV, 7 jets.
Figure 14 : rho-phi view for event number 3. Photon 1 pT = 275 GeV, photon 2 pT = 45 GeV, ST = 1403 GeV, MET = 63 GeV, 7 jets.
Figure 15 : 3D view for event number 4. Photon 1 pT = 303 GeV, photon 2 pT = 135 GeV, ST = 1397 GeV, MET = 51 GeV, 4 jets.
Figure 16 : Lego view for event number 4. Photon 1 pT = 303 GeV, photon 2 pT = 135 GeV, ST = 1397 GeV, MET = 51 GeV, 4 jets.
Figure 17 : rho-phi view for event number 4. Photon 1 pT = 303 GeV, photon 2 pT = 135 GeV, ST = 1397 GeV, MET = 51 GeV, 4 jets.

-- JimHirschauer - 26-Jun-2012

Topic attachments
I Attachment History Action Size Date Who Comment
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PDFpdf bkgShapeComp.pdf r1 manage 28.9 K 2012-06-26 - 14:36 JimHirschauer  
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GIFgif dat_bkg_all_bin50.gif r2 r1 manage 44.2 K 2012-10-11 - 20:49 MarcWeinberg  
PDFpdf dat_bkg_all_bin50.pdf r2 r1 manage 32.9 K 2012-10-11 - 20:49 MarcWeinberg  
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GIFgif limit_st_5jet.gif r1 manage 30.7 K 2012-10-11 - 20:50 MarcWeinberg  
PDFpdf limit_st_5jet.pdf r1 manage 13.9 K 2012-10-11 - 20:50 MarcWeinberg  
PNGpng myEvent1_3DTower.png r1 manage 698.5 K 2012-06-29 - 10:57 MarcWeinberg 3D view for event number 1.
PNGpng myEvent1_lego.png r1 manage 83.3 K 2012-06-29 - 10:59 MarcWeinberg Lego view for event number 1.
PNGpng myEvent1_rhoPhi.png r1 manage 169.5 K 2012-06-29 - 10:59 MarcWeinberg rho-phi view for event number 1.
PNGpng myEvent2_3DTower.png r1 manage 868.1 K 2012-06-29 - 11:13 MarcWeinberg 3D view for event number 2.
PNGpng myEvent2_lego.png r1 manage 102.8 K 2012-06-29 - 11:14 MarcWeinberg Lego view for event number 2.
PNGpng myEvent2_rhoPhi.png r1 manage 199.4 K 2012-06-29 - 11:14 MarcWeinberg rho-phi view for event number 2.
PNGpng myEvent3_3DTower.png r1 manage 703.1 K 2012-06-29 - 11:15 MarcWeinberg  
PNGpng myEvent3_lego.png r1 manage 97.7 K 2012-06-29 - 11:15 MarcWeinberg  
PNGpng myEvent3_rhoPhi.png r1 manage 185.6 K 2012-06-29 - 11:15 MarcWeinberg  
PNGpng myEvent4_3DTower.png r1 manage 716.0 K 2012-06-29 - 11:15 MarcWeinberg  
PNGpng myEvent4_lego.png r1 manage 132.5 K 2012-06-29 - 11:15 MarcWeinberg  
PNGpng myEvent4_rhoPhi.png r1 manage 195.9 K 2012-06-29 - 11:15 MarcWeinberg  
GIFgif squarkDecay.gif r1 manage 31.4 K 2012-06-30 - 23:07 MarcWeinberg  
PDFpdf squarkDecay.pdf r1 manage 74.3 K 2012-06-30 - 23:01 MarcWeinberg  
GIFgif squarkDecay_bw.gif r1 manage 10.5 K 2012-10-11 - 20:50 MarcWeinberg  
PDFpdf squarkDecay_bw.pdf r1 manage 9.4 K 2012-10-11 - 20:50 MarcWeinberg  
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