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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

2018-09-12Journal article Open access
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dc.contributor.authorCMS collaboration (2290 authors)
dc.contributor.authorNayak, Aruna
dc.contributor.authorBargassa, Pedrame
dc.contributor.authorBeirão Da Cruz E Silva, Cristóvão
dc.contributor.authorDi Francesco, Agostino
dc.contributor.authorFaccioli, Pietro
dc.contributor.authorGalinhas, Bruno
dc.contributor.authorGallinaro, Michele
dc.contributor.authorHollar, Jonathan
dc.contributor.authorLeonardo, Nuno
dc.contributor.authorLloret Iglesias, Lara
dc.contributor.authorSeixas, Joao
dc.contributor.authorStrong, Giles
dc.contributor.authorToldaiev, Oleksii
dc.contributor.authorVadruccio, Daniele
dc.contributor.authorVarela, Joao
dc.contributor.authorVischia, Pietro
dc.contributor.authorDavid Tinoco Mendes, Andre
dc.contributor.authorSilva, Pedro
dc.contributor.authorMusella, Pasquale
dc.date.accessioned2019-02-05T16:23:39Z
dc.date.available2019-02-05T16:23:39Z
dc.date.issued2018-09-12
dc.date.updated2019-02-05T16:23:39Z
dc.description.abstractA 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.
dc.description.versionPeer Reviewed
dc.identifierJHEP 1809 (2018) 065; DOI 10.1007/JHEP09(2018)065
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP09(2018)065
dc.identifier.urihttp://hdl.handle.net/10400.26/27640
dc.language.isoeng
dc.relationAdvanced Multi-Variate Analysis for New Physics Searches at the LHC
dc.titleSearch 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
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAdvanced Multi-Variate Analysis for New Physics Searches at the LHC
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/675440/EU
oaire.fundingStreamH2020
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspt
rcaap.typearticle
relation.isProjectOfPublicationd1fe0247-7df8-4eac-ad17-2d56bfcafa24
relation.isProjectOfPublication.latestForDiscoveryd1fe0247-7df8-4eac-ad17-2d56bfcafa24

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