Capability of LHC to discover supersymmetry with \sqrt{s}=7 TeV and 1 fb^{-1}

TL;DR

This paper evaluates the Large Hadron Collider's potential to discover supersymmetry at 7 TeV with 1 fb^{-1} of data, analyzing different scenarios and signals within the mSUGRA model to determine discovery reach in gluino and squark masses.

Contribution

It provides the first detailed analysis of LHC's supersymmetry discovery potential at 7 TeV with limited data, optimizing signal detection strategies including missing transverse energy and alternative signatures.

Findings

LHC can reach gluino masses of up to 1200 GeV with 2 fb^{-1} when m_{ g}  m_{ q}.

Without missing E_T, the reach is reduced but still significant, up to 600 GeV in dijet signals.

Discovery potential varies with integrated luminosity and mass hierarchies, guiding experimental search strategies.

Abstract

We examine the capability of the CERN Large Hadron Collider to discovery supersymmetry (SUSY) with energy \sqrt{s}=7 TeV and integrated luminosity of about 1 fb^{-1}. Our results are presented within the paradigm minimal supergravity model (mSUGRA or CMSSM). Using a 6-dimensional grid of cuts for optimization of signal to background-- including missing E_T-- we find for m_{\tg}\sim m_{\tq} an LHC reach of m_{\tg}\sim 800,\ 950,\ 1100 and 1200 GeV for 0.1, 0.3, 1 and 2 fb^{-1}, respectively. For m_{\tg}<< m_{\tq}, the reach is instead near m_{\tg}\sim 480,\ 540,\ 620 and 700 GeV, for the same integrated luminosities. We also examine the LHC reach in the case of very low integrated luminosity where missing E_T may not be viable. We focus on the multi-muon, multi-lepton (including electrons) and dijet signals. Although the LHC reach without E_T^{miss} is considerably lower in these cases, it is still substantial: for 0.3 fb^{-1}, the dijet reach in terms of gluino mass is up to 600 GeV for very low m_0, while the dilepton reach is to gluino masses of \sim 500 GeV over a range of m_0 values.