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Degenerate gaugino mass region and mono-boson collider signatures

Archana Anandakrishnan, Linda M. Carpenter, and Stuart Raby

  • Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA

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Phys. Rev. D 90, 055004 – Published 4 September, 2014

DOI: https://doi.org/10.1103/PhysRevD.90.055004

Abstract

In this paper we discuss search strategies at the LHC for light electroweak gauginos which are mostly wino-like, Higgsino-like or an admixture. These states are typically degenerate with decay products that are less energetic and hence difficult to detect. In addition, their production cross sections at a hadron collider are suppressed compared to colored states such as the gluinos. In order to detect these states one needs to trigger on initial-or final-state radiation. Many previous analyses have focussed on mono-jet and mono-photon triggers. In this paper we argue and show that these triggers are unlikely to succeed, due to the large background from QCD backgrounds for the mono-jet searches and the fact that the pT distribution of the mono-photons are rapidly decreasing functions of pT. We show this with both an analytic calculation of photons in the initial-state radiation and also a detailed numerical analysis. We then argue that mono-Z triggers, from Z decaying into charged leptons may well provide the best search strategy, in particular for Higgsino-like and mixed cases.

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Phys. Rev. D 90, 055004– Published 4 September, 2014
  • Received 11 July 2014

© 2014 American Physical Society

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