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Title: Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at $$\sqrt{s} =$$ 13 TeV

Abstract

A search for the pair production of the lightest supersymmetric partner of the top quark ($$\widetilde{\mathrm{t}}_1$$) 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 ($$\widetilde{\chi}^0_1$$), 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 $$\widetilde{\chi}^0_1$$; 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 $$\widetilde{\mathrm{t}}_1$$: 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 $$m(\widetilde{\mathrm{t}}_1) - m(\widetilde{\chi}^0_1)$$ mass difference and the decay mode.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS
OSTI Identifier:
1439067
Report Number(s):
FERMILAB-PUB-18-189-CMS; CMS-SUS-17-005; CERN-EP-2018-079; arXiv:1805.05784
1673197
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sirunyan, Albert M, and et al. Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV. United States: N. p., 2018. Web.
Sirunyan, Albert M, & et al. Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV. United States.
Sirunyan, Albert M, and et al. Tue . "Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV". United States. doi:. https://www.osti.gov/servlets/purl/1439067.
@article{osti_1439067,
title = {Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV},
author = {Sirunyan, Albert M and et al.},
abstractNote = {A search for the pair production of the lightest supersymmetric partner of the top quark ($\widetilde{\mathrm{t}}_1$) 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 ($\widetilde{\chi}^0_1$), 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 $\widetilde{\chi}^0_1$; 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 $\widetilde{\mathrm{t}}_1$: 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 $m(\widetilde{\mathrm{t}}_1) - m(\widetilde{\chi}^0_1)$ mass difference and the decay mode.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2018},
month = {Tue May 15 00:00:00 EDT 2018}
}