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

Show full item record



Permalink

http://hdl.handle.net/10138/301461

Citation

Ghosh , D K , Huitu , K , Mondal , S & Mitra , M 2019 , ' Same-sign trilepton signal for stop quark in the presence of sneutrino dark matter ' , Physical Review D , vol. 99 , no. 7 , 075014 . https://doi.org/10.1103/PhysRevD.99.075014

Title: Same-sign trilepton signal for stop quark in the presence of sneutrino dark matter
Author: Ghosh, Dilip Kumar; Huitu, Katri; Mondal, Subhadeep; Mitra, Manimala
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-04-15
Language: eng
Number of pages: 12
Belongs to series: Physical Review D
ISSN: 2470-0010
URI: http://hdl.handle.net/10138/301461
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 (Y-nu) to fit the neutrino oscillation data, the resulting Y-nu is highly constrained from the lepton-flavor-violating decay constraints. The smallness of Y-nu 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.
Subject: 114 Physical sciences
NEUTRINO MASS
MODEL
SEARCH
FLAVOR
PROGRAM
SPHENO
DECAYS
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
PhysRevD.99.075014.pdf 1.963Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record