Department of Physics
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Item Exploring Compressed Top Squark Region with Kinematic Variables(Springer, 2018-05) Mandal, TanmoyWe investigate the usefulness of kinematic variables sensitive to the compressed mass region of supersymmetric spectrum. We propose a search strategy considering phenomenological supersymmetric scenario where the top squark (stop) undergoes a four-body decay. We observe that it is indeed possible to regulate the enormous background and in turn improve the present experimental limit with 13 TeV data.Item Constraining slepton and chargino through compressed top squark search(Springer, 2018-04) Mandal, TanmoyWe examine the compressed mass spectrum with sub-TeV top squark 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 lightest neutralino (χ 01 ), 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 and χ 01 . 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 can be excluded up to 710 GeV right away for χ of 640 GeV for a particular mass gap between different states.