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29 March 2024
 
  » arxiv » hep-ph/0512284

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Same-sign top quarks as signature of light stops at the CERN LHC
S. Kraml ; A. R. Raklev ;
Date 22 Dec 2005
AbstractWe present a new method to search for a light scalar top with $m_{ ilde{t}_1}lsim m_t$, decaying dominantly into a c-jet and the lightest neutralino, at the LHC. The principal idea is to exploit the Majorana nature of the gluino, leading to same-sign top quarks in events of gluino-pair production followed by gluino decays into top and stop. The resulting signature is 2 b-jets plus 2 same-sign leptons plus additional jets and missing energy. We perform a Monte Carlo simulation for a benchmark scenario, which is in agreement with the recent WMAP bound on the relic density of dark matter, and demonstrate that for $m_{ ilde{g}}lsim 900$ GeV and $m_{ ilde{q}}>m_{ ilde{g}}$ the signal can be extracted from the background. Moreover, we discuss the determination of the stop and gluino masses from the shape of invariant-mass distributions. The derivation of the shape formulae is also given.
Source arXiv, hep-ph/0512284
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