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Monojets and monophotons from light Higgsino pair production at LHC14

Howard Baer1,*, Azar Mustafayev2,3,†, and Xerxes Tata2,§

  • 1Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA
  • 2Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
  • 3Theory Division, CERN, CH-1211 Geneva 23, Switzerland

  • *baer@nhn.ou.edu
  • †azar@phys.hawaii.edu
  • §tata@phys.hawaii.edu
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Phys. Rev. D 89, 055007 – Published 11 March, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.055007

Abstract

Naturalness arguments imply the existence of Higgsinos lighter than 200–300 GeV. However, because these Higgsinos are nearly mass degenerate, they release very little visible energy in their decays, and signals from electroweak Higgsino pair production typically remain buried under Standard Model backgrounds. Moreover, gluinos, squarks and winos may plausibly lie beyond the reach of the LHC14, so that signals from naturalness-inspired supersymmetric models may well remain hidden via conventional searches. We examine instead prospects for detecting Higgsino pair production via monojets or monophotons from initial-state radiation. We find typical signal-to-background rates at best at the 1% level and without any spectral distortions, leading to rather pessimistic conclusions regarding detectability via these channels.

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Phys. Rev. D 89, 055007– Published 11 March, 2014
  • Received 14 January 2014

© 2014 American Physical Society

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