Abstract
A combination of searches for top squark pair production using proton–proton collision data at a center-of-mass energy of 13,text {Te}text {V} at the CERN LHC, corresponding to an integrated luminosity of 137,text {fb}^{-1} collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on the model, the combined result excludes a top squark mass up to 1325,text {Ge}text {V} for a massless neutralino, and a neutralino mass up to 700,text {Ge}text {V} for a top squark mass of 1150,text {Ge}text {V}. Top squarks with masses from 145 to 295,text {Ge}text {V}, for neutralino masses from 0 to 100,text {Ge}text {V}, with a mass difference between the top squark and the neutralino in a window of 30,text {Ge}text {V} around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420,text {Ge}text {V}.
Highlights
This paper presents the combination of previously published searches [16,17,18] for the pair production of SUSY top quark partners in final states without leptons, with one, or with two charged leptons, in events from√ proton–proton collisions at a center-of-mass energy ( s) of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb−1, and referred to here as inclusive analyses
Both top squarks decay according to the first decay chain; in the second model, both decay according to the second decay chain; in the third model, these two decays occur with equal probability
The statistical interpretation is performed by testing the standard model (SM) hypothesis against the SUSY hypothesis
Summary
This paper presents the combination of previously published searches [16,17,18] for the pair production of SUSY top quark partners in final states without leptons, with one, or with two charged leptons, in events from√ proton–proton (pp) collisions at a center-of-mass energy ( s) of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb−1, and referred to here as inclusive analyses It includes a new analysis targeting a parameter space where the mass difference between the top squark and the neutralino is close to the top quark mass, whose results are combined with the previously published studies. Prior searches by the ATLAS and CMS Collaborations excluded scalar and pseudoscalar mediator particles with a mass of up to 290 and 300 GeV, respectively [30,49,50,51,52]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
