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Exploring compressed supersymmetry with same-sign top quarks at the CERN Large Hadron Collider

Stephen P. Martin

  • Department of Physics, Northern Illinois University, DeKalb Illinois 60115, USA, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia Illinois 60510, USA, and Kavli Institute for Theoretical Physics, University of California, Santa Barbara California 93106-4030, USA

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Phys. Rev. D 78, 055019 – Published 26 September, 2008

DOI: https://doi.org/10.1103/PhysRevD.78.055019

Abstract

In compressed supersymmetry, a light top squark naturally mediates efficient neutralino pair annihilation to govern the thermal relic abundance of dark matter. I study the CERN LHC signal of same-sign leptonic top-quark decays from gluino and squark production, which follows from gluino decays to top plus stop followed by the stop decaying to a charm quark and the LSP in these models. Measurements of the numbers of jets with heavy-flavor tags in the same-sign lepton events can be used to confirm the origin of the signal. Summed transverse momentum observables provide an estimate of an effective superpartner mass, which is correlated with the gluino mass. Measurements of invariant mass endpoints from the visible products of gluino decays do not allow direct determination of superpartner masses, but can place constraints on them, including lower bounds on the gluino mass as a function of the top-squark mass.

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Phys. Rev. D 78, 055019– Published 26 September, 2008
  • Received 6 August 2008

© 2008 American Physical Society

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