Probing the stau-neutralino coannihilation region at the LHC with a soft tau lepton and a jet from initial state radiation

Andrés Flórez, Luis Bravo, Alfredo Gurrola, Carlos Ávila, Manuel Segura, Paul Sheldon, and Will Johns
Phys. Rev. D 94, 073007 – Published 25 October 2016

Abstract

We present a feasibility study, to search for dark matter at the LHC, in events with one soft hadronically decaying tau lepton and missing transverse energy recoiling against a hard pT jet from initial state radiation. This methodology allows the search for supersymmetry in compressed mass spectra regions, where the mass difference between the lightest neutralino, χ˜10, and the stau (the tau superpartner), τ˜, is small. Several theoretical models predict a direct connection between thermal bino dark matter and staus within this scenario. We show that compressed regions, not excluded by ATLAS nor CMS experiments, are opened up with the increase in experimental sensitivity reached with the proposed methodology. The requirement of a hard jet from initial state radiation combined with a soft tau lepton is effective in reducing Standard Model backgrounds, providing expected significances greater than 3σ for χ˜1± masses up to 300 GeV and τ˜χ˜10 mass gaps below 25 GeV with only 30fb1 of 13 TeV data from the LHC.

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  • Received 7 July 2016

DOI:https://doi.org/10.1103/PhysRevD.94.073007

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Andrés Flórez1, Luis Bravo1, Alfredo Gurrola2, Carlos Ávila1, Manuel Segura1, Paul Sheldon2, and Will Johns2

  • 1Physics Department, Universidad de los Andes, Bogotá 111711, Colombia
  • 2Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA

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Issue

Vol. 94, Iss. 7 — 1 October 2016

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