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Search for top squark pair production in compressed-mass-spectrum scenarios in proton-proton collisions at $\sqrt{s}$ = 8 TeV using the $\alpha_T$ variable

dc.contributor.authorCMS collaboration (2296 authors)
dc.contributor.authorCalpas, Betty
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.authorFerreira Parracho, Pedro Guilherme
dc.contributor.authorGallinaro, Michele
dc.contributor.authorHollar, Jonathan
dc.contributor.authorLeonardo, Nuno
dc.contributor.authorLloret Iglesias, Lara
dc.contributor.authorNguyen, Federico
dc.contributor.authorRodrigues Antunes, Joao
dc.contributor.authorSeixas, Joao
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.contributor.authorPela, Joao
dc.date.accessioned2019-02-04T10:05:30Z
dc.date.available2019-02-04T10:05:30Z
dc.date.issued2017-04-10
dc.date.updated2019-02-04T10:05:30Z
dc.description.abstractAn inclusive search is performed for supersymmetry in final states containing jets and an apparent imbalance in transverse momentum, p→Tmiss , due to the production of unobserved weakly interacting particles in pp collisions at a centre-of-mass energy of 8 TeV. The data, recorded with the CMS detector at the CERN LHC, correspond to an integrated luminosity of 18.5 fb −1 . The dimensionless kinematic variable αT is used to discriminate between events with genuine p→Tmiss associated with unobserved particles and spurious values of p→Tmiss arising from jet energy mismeasurements. No excess of event yields above the expected standard model backgrounds is observed. The results are interpreted in terms of constraints on the parameter space of several simplified models of supersymmetry that assume the pair production of top squarks. The search provides sensitivity to a broad range of top squark ( t˜ ) decay modes, including the two-body decay t˜→cχ˜10 , where c is a charm quark and χ˜10 is the lightest neutralino, as well as the four-body decay t˜→bff¯′χ˜10 , where b is a bottom quark and f and f¯′ are fermions produced in the decay of an intermediate off-shell W boson. These modes dominate in scenarios in which the top squark and lightest neutralino are nearly degenerate in mass. For these modes, top squarks with masses as large as 260 and 225 GeV are excluded, respectively, for the two- and four-body decays.
dc.description.versionPeer Reviewed
dc.identifierPhys.Lett. B767 (2017) 403-430; DOI 10.1016/j.physletb.2017.02.007
dc.identifier.urihttp://dx.doi.org/10.1016/j.physletb.2017.02.007
dc.identifier.urihttp://hdl.handle.net/10400.26/27094
dc.language.isoeng
dc.titleSearch for top squark pair production in compressed-mass-spectrum scenarios in proton-proton collisions at $\sqrt{s}$ = 8 TeV using the $\alpha_T$ variable
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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