Same-sign top quarks as signature of light stops at the CERN LHC

Details Same-sign top quarks as signature of light stops at the CERN LHC Same-sign top quarks as signature of light stops at the CERN LHC

2005-12-21

arxiv.org/abs/hep-ph/0512284v3

Phys.Rev.D73:075002,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 6 figures, minor changes; version to appear in PRD

Scientific paper

10.1103/PhysRevD.73.075002

We present a new method to search for a light scalar top with $m_{\tilde{t}_1}\lsim m_t$, 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 $m_{\tilde{g}}\lsim 900$ GeV and $m_{\tilde{q}}>m_{\tilde{g}}$ 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.

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