• Open Access

Same-sign trilepton signal for stop quark in the presence of sneutrino dark matter

Dilip Kumar Ghosh, Katri Huitu, Subhadeep Mondal, and Manimala Mitra
Phys. Rev. D 99, 075014 – Published 15 April 2019

Abstract

We explore a minimal supersymmetric standard model scenario extended by one pair of gauge singlets per generation. In the model, light neutrino masses and their mixings are generated via the inverse seesaw mechanism. In such a scenario, a right-handed sneutrino can be the lightest supersymmetric particle and a cold dark matter (DM) candidate. If the Casas-Ibarra parametrization is imposed on the Dirac neutrino Yukawa coupling matrix (Yν) to fit the neutrino oscillation data, the resulting Yν is highly constrained from the lepton-flavor-violating decay constraints. The smallness of Yν requires the sneutrino DM to coannihilate with other sparticle(s) in order to satisfy the DM relic density constraint. We study sneutrino coannihilation with winos and observe that this sneutrino-wino compressed parameter space gives rise to a novel same-sign trilepton signal for the top squark, which is more effective than the conventional top squark search channels in the present framework. We show that the choice of neutrino mass hierarchy strongly affects the signal event rate, making it easier to probe the scenario with the inverted mass hierarchy.

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  • Received 29 November 2018

DOI:https://doi.org/10.1103/PhysRevD.99.075014

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Dilip Kumar Ghosh*

  • Department of Theoretical Physics, Indian Association for the Cultivation of Science Jadavpur, Kolkata 700 032, India

Katri Huitu and Subhadeep Mondal

  • Department of Physics, and Helsinki Institute of Physics, P. O. Box 64, FI-00014 University of Helsinki, Finland

Manimala Mitra§

  • Institute of Physics, Sachivalaya Marg, Bhubaneswar, Odisha 751005, India, Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400085, India

  • *tpdkg@iacs.res.in
  • katri.huitu@helsinki.fi
  • subhadeep.mondal@helsinki.fi
  • §manimala@iopb.res.in

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Issue

Vol. 99, Iss. 7 — 1 April 2019

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