Constraining slepton and chargino through compressed top squark search

Partha Konar, Tanmoy Mondal, Abhaya Kumar Swain
2018 Journal of High Energy Physics  
We examine the compressed mass spectrum with sub-TeV top squark (t̃) as lightest colored (s)particle in natural supersymmetry (SUSY). Such spectra are searched along with an additional hard jet, not only to boost the soft decay particles, also to yield enough missing transverse momentum. Several interesting kinematic variables are proposed to improve the probe performance for this difficult region, where we concentrate on relatively clean dileptonic channel of the top squark decaying into
more » ... st neutralino (χ_1^0), which is also the lightest supersymmetric particle. In this work, we investigate the merit of these kinematic variables, sensitive to compressed mass region extending the search by introducing additional states, chargino and slepton (sneutrino) having masses in between the t̃ and χ_1^0. Enhanced production and lack of branching suppression are capable of providing a strong limit on chargino and slepton/sneutrino mass along with top squark mass. We perform a detailed collider analysis using simplified SUSY spectrum and found that with the present LHC data M_t̃ can be excluded up to 710 GeV right away for M_χ_1^0 of 640 GeV for a particular mass gap between different states.
doi:10.1007/jhep04(2018)024 fatcat:jw3snd56u5bdzbgbtzn2mxwmoa