Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-12-19
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 10 figures and 4 tables
Scientific paper
We explore the implications of 7 TeV LHC searches for a scenario in which one of the stops is the next-to-lightest supersymmetric particle (NLSP). The NLSP stop (\tilde{t}_1) is assumed to decay exclusively into neutralino and charm quark. We consider processes where the stops are pair produced together with a hard QCD jet, and they also arise from gluino decay, \tilde{g}\to t\tilde{t}_1^\ast+\bar{t}\tilde{t}_1. The monojet ATLAS and CMS searches corresponding to 1 fb^{-1} of integrated luminosity are sensitive to stop masses of up to 160 GeV, with the 20% coannihilation region with M_{\tilde{t}_1} <~ 140 GeV essentially ruled out. The region M_{\tilde{t}_1} <~ 130 GeV is excluded with even relatively larger M_{\tilde{t}_1}-M_{\tilde{\chi}_1^0} ~ 40 GeV by the multi-jets search. The involvement of heavier gluino is sensitive to the b-jets and same-sign dileptons searches because they only pick up gluino pair production events followed by top quark decaying into b-jet and same-sign dileptons, respectively. We find that the LHC data places a lower limit on the gluino mass in this scenario of about 600 GeV (700 GeV) from b-jets (same-sign dileptons) searches.
He Bin
Li Tong
Shafi Qaisar
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