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The European Physical Journal C

, Volume 56, Issue 4, pp 511–528 | Cite as

Heavy-flavor tagging and the supersymmetry reach of the CERN Large Hadron Collider

  • R. H. K. KadalaEmail author
  • P. G. Mercadante
  • J. K. Mizukoshi
  • Xerxes Tata
Regular Article - Theoretical Physics

Abstract

The branching fraction for the decays of gluinos to third generation quarks is expected to be enhanced in classes of supersymmetric models where either third generation squarks are lighter than other squarks, or in mixed-higgsino dark matter models constructed so as to be in concordance with the measured density of cold dark matter. In such scenarios, gluino production events at the CERN Large Hadron Collider should be rich in top and bottom quark jets. Requiring b jets in addition to E T miss should, therefore, enhance the supersymmetry signal relative to Standard Model backgrounds from V + jet, VV and QCD backgrounds (V=W,Z). We quantify the increase in the supersymmetry reach of the LHC from b-tagging in a variety of well-motivated models of supersymmetry. We also explore “top tagging” at the LHC. We find that while the efficiency for this turns out to be too low to give an increase in reach beyond that obtained via b-tagging, top tagging can indeed provide a confirmatory signal if gluinos are not too heavy. We also examine c jet tagging but find that it is not useful at the LHC. Finally, we explore the prospects for detecting the direct production of third generation squarks in models with an inverted squark mass hierarchy. This is signaled by b jets + E T miss events being harder than in the Standard Model, but softer than those from the production of gluinos and heavier squarks. We find that while these events can be readily separated from the SM background (for third generation squark masses ∼300–500 GeV), the contamination from the much heavier gluinos and squarks remains formidable if these are also accessible.

Keywords

Large Hadron Collider High Energy Phys Light Supersymmetric Particle Soft SUSY Breaking Generation Squarks 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2008

Authors and Affiliations

  • R. H. K. Kadala
    • 1
    • 2
    Email author
  • P. G. Mercadante
    • 3
  • J. K. Mizukoshi
    • 4
  • Xerxes Tata
    • 2
  1. 1.College of Natural SciencesHawaii Pacific UniversityKaneoheUSA
  2. 2.Department of Physics and AstronomyUniversity of HawaiiHonoluluUSA
  3. 3.Instituto de Física TeóricaUniversidade Estadual PaulistaSão PauloBrazil
  4. 4.Centro de Ciências Naturais e HumanasUniversidade Federal do ABCSanto AndréBrazil

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