CMS-PAS-SUS-14-003

CMS-PAS-SUS-14-003
Search for R-parity-violating supersymmetry in proton-proton collisions at $\sqrt{s} =$ 8 TeV in events with large jet and b-jet multiplicity
CMS Collaboration
September 2015

Abstract: Preliminary results are reported from a search for new physics beyond the standard model (SM) in proton-proton collisions at a center-of-mass energy $\sqrt{s}=$ 8 TeV, focusing on the signature of large multiplicity of jets and b-tagged jets. The data sample comprises an integrated luminosity of 19.5 fb $^{-1}$ recorded by the CMS experiment at the Large Hadron Collider (LHC). The results are used to exclude gluinos with $m_{\rm gluino} <$ 980 GeV in an R-parity violating supersymmetric extension of the standard model in which each gluino decays via $\mathrm{ \widetilde{ g} \to {tbs} }$ .
Links: CDS record (PDF) ; CADI line (restricted) ; Figures are also available from the CDS record. These preliminary results are superseded in this paper, PRD 94 (2016) 112009. The superseded preliminary plots can be found here.

Figures
png ; pdf	Figure 1: Feynman diagram for pair production of gluinos decaying to ${\mathrm {t}} {\mathrm {b}} {\mathrm {s}}$ .
png ; pdf	Figure 2: Fit to the CSV distribution in data for 4 $\le N_{\rm jet}\le$ 5, $H_{T}>$ 1.1 TeV and ${\rm CSV}>$ 0.9. Error bars indicate the statistical uncertainty arising from MC statistics.
png ; pdf	Figure 3-a: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution are shown. The shaded band shows the MC statistical uncertainty. The a,b,c (d,e,t) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $4 (a,d),$ N_{\textrm {jet}} = $5 (b,e), and$ N_{\textrm {jet}} =$ 6 (c,f).
png ; pdf	Figure 3-b: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution are shown. The shaded band shows the MC statistical uncertainty. The a,b,c (d,e,t) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $4 (a,d),$ N_{\textrm {jet}} = $5 (b,e), and$ N_{\textrm {jet}} =$ 6 (c,f).
png ; pdf	Figure 3-c: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution are shown. The shaded band shows the MC statistical uncertainty. The a,b,c (d,e,t) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $4 (a,d),$ N_{\textrm {jet}} = $5 (b,e), and$ N_{\textrm {jet}} =$ 6 (c,f).
png ; pdf	Figure 3-d: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution are shown. The shaded band shows the MC statistical uncertainty. The a,b,c (d,e,t) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $4 (a,d),$ N_{\textrm {jet}} = $5 (b,e), and$ N_{\textrm {jet}} =$ 6 (c,f).
png ; pdf	Figure 3-e: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution are shown. The shaded band shows the MC statistical uncertainty. The a,b,c (d,e,t) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $4 (a,d),$ N_{\textrm {jet}} = $5 (b,e), and$ N_{\textrm {jet}} =$ 6 (c,f).
png ; pdf	Figure 3-f: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution are shown. The shaded band shows the MC statistical uncertainty. The a,b,c (d,e,t) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $4 (a,d),$ N_{\textrm {jet}} = $5 (b,e), and$ N_{\textrm {jet}} =$ 6 (c,f).
png ; pdf	Figure 4: Data (dots with error bars), uncorrected MC prediction (band), and truth-matched gluon splitting events scaled to the data-MC difference in $\Delta R<$ 1.6 (histogram) in a typical signal region corresponding to $H_{T}>$ 1750 GeV and $N_{\rm jet}=$ 6.
png ; pdf	Figure 5-a: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution in the high $N_{\textrm {jet}}$ signal region. The shaded band shows the MC statistical uncertainty. The a,b (c,d) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $7 (a,c) and$ N_{\textrm {jet}} \geq$ 8 (b,d).
png ; pdf	Figure 5-b: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution in the high $N_{\textrm {jet}}$ signal region. The shaded band shows the MC statistical uncertainty. The a,b (c,d) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $7 (a,c) and$ N_{\textrm {jet}} \geq$ 8 (b,d).
png ; pdf	Figure 5-c: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution in the high $N_{\textrm {jet}}$ signal region. The shaded band shows the MC statistical uncertainty. The a,b (c,d) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $7 (a,c) and$ N_{\textrm {jet}} \geq$ 8 (b,d).
png ; pdf	Figure 5-d: Data (dots with error bars) and the corrected prediction of the $N_{b}$ distribution in the high $N_{\textrm {jet}}$ signal region. The shaded band shows the MC statistical uncertainty. The a,b (c,d) series of plots shows data in which events are required to have 1000 $ $1750 GeV). The jet multiplicity requirements are$ N_{\textrm {jet}} = $7 (a,c) and$ N_{\textrm {jet}} \geq$ 8 (b,d).
png ; pdf	Figure 6-a: Signal efficiencies as a function of $m_{ \mathrm{ \tilde{g} } }$ for $N_b\geq$ 2, $H_{T}>$ 1.0 TeV, and $N_{\rm jet}\geq$ 6, together with the breakdown among $N_{\textrm {jet}}$ bins (a). Expected and observed limits in the all-hadronic $\mathrm{ \tilde{g} \to t b s }$ analysis. The red band is the gluino pair production cross section (b).
png ; pdf	Figure 6-b: Signal efficiencies as a function of $m_{ \mathrm{ \tilde{g} } }$ for $N_b\geq$ 2, $H_{T}>$ 1.0 TeV, and $N_{\rm jet}\geq$ 6, together with the breakdown among $N_{\textrm {jet}}$ bins (a). Expected and observed limits in the all-hadronic $\mathrm{ \tilde{g} \to t b s }$ analysis. The red band is the gluino pair production cross section (b).

Compact Muon Solenoid
LHC, CERN