Journal of High Energy Physics > 2018 > 2018 > 9 > 1-47
Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at s=13 $$ \sqrt{s}=13 $$ TeV
Source
Abstract
A search for the pair production of the lightest supersymmetric partner of the top quark t˜1 $$ \left({\tilde{\mathrm{t}}}_1\right) $$ is presented. The search focuses on a compressed scenario where the mass difference between the top squark and the lightest supersymmetric particle, often considered to be the lightest neutralino χ˜10 $$ \left({\tilde{\upchi}}_1^0\right) $$, is smaller than the mass of the W boson. The proton-proton collision data were recorded by the CMS experiment at a centre-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb−1. In this search, two decay modes of the top squark are considered: a four-body decay into a bottom quark, two additional fermions, and a χ˜10 $$ {\tilde{\upchi}}_1^0 $$; and a decay via an intermediate chargino. Events are selected using the presence of a high-momentum jet, significant missing transverse momentum, and a low transverse momentum electron or muon. Two analysis techniques are used, targeting different decay modes of the t˜1 $$ {\tilde{\mathrm{t}}}_1 $$: a sequential selection and a multivariate technique. No evidence for the production of top squarks is found, and mass limits at 95% confidence level are set that reach up to 560 GeV, depending on the mt˜1−mχ˜10 $$ m\left({\tilde{\mathrm{t}}}_1\right)-m\left({\tilde{\upchi}}_1^0\right) $$ mass difference and the decay mode.
Identifiers
journal e-ISSN : | 1029-8479 |
DOI | 10.1007/JHEP09(2018)065 |