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ProspectsforSUSYandUED

Introduction

This note presents an evaluation of the discovery potential of Supersymmetry and Universal Extra Dimensions for channels with jets, leptons and missing transverse energy. The LHC running scenario at a centre-of-mass energy of 10 TeV, delivering an integrated luminosity of $200 {pb}^{-1}$ for the 2009-2010 run is investigated. Figure 1

Figure 1: Parameters of the pMSSM with constraints grid. Shown are (from top to bottom) the distribution of $\tan \beta$, the mass of the gluino versus the mass of the light squarks, the mass of the $\chi_{0}^{1}$ and the mass of the $\tilde{t}_{1}$. The lowest plot shows the distribution of the various types of nLSP for the same pMSSM models.

Figure 2

Figure2: Number of events expected for 200 $\rm{pb}^{-1}$ in 0-lepton channels and multi-leptons channels after preselection for the main background processes and the SUSY signal SU4.

Figure 3

Figure3: Effective mass distributions for the 2 jet (upper plot), 3 jet (middle plot) and 4 jet channel (lower plot) with 0 leptons.

Figure 4

Figure 4: Missing transverse energy distributions for the 4 jet channel with 0 leptons.

Figure 5

Figure5: Effective mass distributions for the 2 jet (upper plot), 3 jet (middle plot) and 4 jet channel (lower plot) with 1 lepton.

Figure 6

Figure6: Effective mass distributions for the 2 jet (upper plot), 3 jet (middle plot) and 4 jet channel (lower plot) with 2 leptons with opposite sign (OS) charge.

Figure 7

Figure 7: $M_T$ distributions for the 4 jet channel with 1 lepton.

Figure 8

Figure 8: $5\sigma$ discovery reach as a function of $m_{0}$ and $m_{1/2}$ for $\tan \beta =10$ mSUGRA scan for channels with 0, 1 and 2 leptons. Only the channels with the largest discovery reach are shown for each lepton multiplicity.

Figure 9

Figure 9: 5\sigma$ discovery reach as a function of $m_{0}$ and $m_{1/2}$ for $\tan \beta =50$ mSUGRA scan for channels with 0 and 1 leptons.

Figure 10

Figure 10: The points of the pMSSM grids with constraints as a function of the total cross section and the minimal SUSY mass (upper plot) and as a function of the minimal mass of the light squarks and the mass of the gluino (lower plot).

Figure 11

Figure 11: Significance $\sigma$ as a function of $1/R$ for the Universal Extra Dimensions scenario, taking into account channels with 0, 1 and 2 leptons.

Table1

Process Generator Simulation $N_{\rm points}$ $N_{\rm events}$ per point
mSUGRA $\tan \beta =10$ HERWIG 6.5 ATLFAST2 76 30000
mSUGRA $\tan \beta =50$ HERWIG 6.5 & ATLFAST2 23 30000
pMSSM constraints PYTHIA 6.4 ATLFAST1 150 30000
UED PYTHIA 6.4 ATLFAST2 8 5000-100000

Table1: The Monte Carlo generator, detector simulation programme, the number of points in parameter space per model, and the number of events per point for all signal samples.

Table2

Process Generator $N_{events}$ $\sigma * BR * \it{eff}$ Simulation
\ttbar($\ell\nu qq$ + $\ell\nu\ell\nu$) MC@NLO+JIMMY 3327021 202.86 GEANT4
\ttbar($qqqqbb$) MC@NLO+JIMMY 3685781 170.74 ATLFAST2
Single top ($Wt$ + tchan) AcerMC 14281 55.53 GEANT4
QCD bb $(35<p_{T}<70)$ ALPGEN+JIMMY 70000 7522.42 ATLFAST2
QCD bb $(70<p_{T}<140)$ ALPGEN+JIMMY 289999 29119.15 ATLFAST2
QCD bb $(140<p_{T}<280)$ ALPGEN+JIMMY 45000 4384.20 ATLFAST2
QCD bb $(p_T>280)$ ALPGEN+JIMMY 57467 186.80 ATLFAST2
QCD udsc $(35<p_{T}<70)$ ALPGEN+JIMMY 2827992 375056.88 ATLFAST2
QCD udsc $(70<p_{T}<140)$ ALPGEN+JIMMY 1390216 1193879.82 ATLFAST2
QCD udsc $(140<p_{T}<280)$ ALPGEN+JIMMY 1821843 182230.10 ATLFAST2
QCD udsc $(p_T>280)$ ALPGEN+JIMMY 1938961 7210.30 ATLFAST2
$W \rightarrow e\nu$ + jets ALPGEN+JIMMY 3110747 13249.00 ATLFAST2
$W \rightarrow \mu\nu$ + jets ALPGEN+JIMMY 1635166 13237.30 ATLFAST2
$W \rightarrow \tau\nu$ + jets ALPGEN+JIMMY 2113632 13233.00 ATLFAST2
\Zboson \rarrow ee + jets ALPGEN+JIMMY 635835 1206.10 ATLFAST2
\Zboson \rarrow $\mu\mu$ + jets ALPGEN+JIMMY 605000 1204.20 ATLFAST2
\Zboson \rarrow $\nu\nu$ + jets ALPGEN+JIMMY 2399496 7056.30 ATLFAST2
\Zboson \rarrow $\tau\tau$ + jets ALPGEN+JIMMY 566498 1211.00 ATLFAST2
$WW$ gg2WW +JIMMY 52391 0.28 GEANT4
\Wminus\Zboson MC@NLO+JIMMY 16807 21.75 GEANT4
\Wplus\Wminus MC@NLO+JIMMY 41108 7.14 GEANT4
\Wplus\Zboson MC@NLO+JIMMY 7286 37.28 GEANT4
\Zboson\Zboson MC@NLO+JIMMY 13456 18.41 GEANT4

Table2 : Summary of Standard Model datasets used in this analysis. The QCD samples are subdivided according to the $p_T$ (GeV) of the leading jet and the type of quark produced. $N_{events}$ is the sum of MC weights, i.e. weight = \pm1$ for events produced with the MC@NLO generator. The cross section reduced by the branching ratio and the generator level filter efficiency is $\sigma * BR * eff.

Table3:

The number of background and SU4 events for the plots Figure 3-5 can be found here: number_of_events.txt


Major updates:
-- JanetDietrich - 2009-08-27

Responsible: JanetDietrich
Last reviewed by: Never reviewed

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