2005/12/31 by Sabine Kraml, S. Kraml, Are Raklev +1 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.73.075002
published as Phys.Rev.D73:075002,2006 · 20 pages, 6 figures, minor changes; version to appear in PRD
arxiv created 2006/03/27 · openalex publication_date 2006/04/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a new method to search for a light scalar top with m_\stackrel\texttildelowt1\ensuremath\lesssimmt, 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_\stackrel\texttildelowg\ensuremath\lesssim900 GeV and m_\stackrel\texttildelowq>m_\stackrel\texttildelowg 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 formulas is also given.