Gluino coannihilation and observability of gluinos at LHC run II

Pran Nath and Andrew B. Spisak
Phys. Rev. D 93, 095023 – Published 26 May 2016

Abstract

The observability of a gluino at LHC run II is analyzed for the case where the gluino lies in the gluino-neutralino coannihilation region and the mass gap between the gluino and the neutralino is small. The analysis is carried out under the Higgs boson mass constraint and the constraint of dark matter relic density consistent with WMAP and Planck experiments. It is shown that in this case a gluino with mass much smaller than the current lower limit of 1500GeV as given by LHC run II at 3.2fb1 of integrated luminosity would have escaped detection. The analysis is done using the signal regions used by the ATLAS Collaboration where an optimization of signal regions was carried out to determine the best regions for gluino discovery in the gluino-neutralino coannihilation region. It is shown that under the Higgs boson mass constraint and the relic density constraint, a gluino mass of 700GeV would require 14fb1 of integrated luminosity for discovery and a gluino of mass 1250GeV would require 3400fb1 of integrated luminosity for discovery at LHC run II. An analysis of dark matter for this case is also given. It is found that for the range of gluino masses considered, the neutralino mass lies within less than 100 GeV of the gluino mass. Thus a measurement of the gluino mass in the gluino-neutralino coannihilation region will provide a determination of the neutralino mass. In this region the neutralino is dominantly a gaugino and the spin-independent proton-neutralino cross section is small but much larger than the neutrino floor lying in the range (110)×1047cm2. Thus a significant part of the parameter space of the model will lie within the reach of the next generation LUX-ZEPLIN dark matter experiment.

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  • Received 15 March 2016

DOI:https://doi.org/10.1103/PhysRevD.93.095023

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Pran Nath* and Andrew B. Spisak

  • Department of Physics, Northeastern University, Boston, Massachusetts 02115-5000, USA

  • *p.nath@neu.edu
  • a.spisak@neu.edu

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Issue

Vol. 93, Iss. 9 — 1 May 2016

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