In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2018, No. 9 ( 2018-09)
Abstract:
A search for the pair production of the lightest supersymmetric partner of the top quark $$ \left({\tilde{\mathrm{t}}}_1\right) $$ t ˜ 1 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 $$ \left({\tilde{\upchi}}_1^0\right) $$ χ ˜ 1 0 , 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 $$ {\tilde{\upchi}}_1^0 $$ χ ˜ 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 $$ {\tilde{\mathrm{t}}}_1 $$ 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 $$ m\left({\tilde{\mathrm{t}}}_1\right)-m\left({\tilde{\upchi}}_1^0\right) $$ m t ˜ 1 − m χ ˜ 1 0 mass difference and the decay mode.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP09(2018)065
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2018
detail.hit.zdb_id:
2027350-2