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Search for vectorlike light-flavor quark partners in proton-proton collisions at $\sqrt s$ =8  TeV

2018-04-11Journal article Open access
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dc.contributor.authorCMS collaboration (2223 authors)
dc.contributor.authorNayak, A.
dc.contributor.authorBargassa, P.
dc.contributor.authorBeirão Da Cruz E Silva, C.
dc.contributor.authorCalpas, B.
dc.contributor.authorDi Francesco, A.
dc.contributor.authorFaccioli, P.
dc.contributor.authorGallinaro, M.
dc.contributor.authorHollar, J.
dc.contributor.authorLeonardo, N.
dc.contributor.authorLloret Iglesias, L.
dc.contributor.authorSeixas, J.
dc.contributor.authorToldaiev, O.
dc.contributor.authorVadruccio, D.
dc.contributor.authorVarela, J.
dc.contributor.authorVischia, P.
dc.contributor.authorDavid, A.
dc.contributor.authorVeckalns, V.
dc.contributor.authorMusella, P.
dc.contributor.authorPela, J.
dc.contributor.authorDelgado, A.
dc.date.accessioned2019-02-04T13:39:05Z
dc.date.available2019-02-04T13:39:05Z
dc.date.issued2018-04-11
dc.date.updated2019-02-04T13:39:05Z
dc.description.abstractA search is presented for heavy vectorlike quarks (VLQs) that couple only to light quarks in proton-proton collisions at s=8  TeV at the LHC. The data were collected by the CMS experiment during 2012 and correspond to an integrated luminosity of 19.7  fb−1. Both single and pair production of VLQs are considered. The single-production search is performed for down-type VLQs (electric charge of magnitude 1/3), while the pair-production search is sensitive to up-type (charge of magnitude 2/3) and down-type VLQs. Final states with at least one muon or one electron are considered. No significant excess over standard model expectations is observed, and lower limits on the mass of VLQs are derived. The lower limits range from 400 to 1800 GeV, depending on the single-production cross section and the VLQ branching fractions B to W, Z, and Higgs bosons. When considering pair production alone, VLQs with masses below 845 GeV are excluded for B(W)=1.0, and below 685 GeV for B(W)=0.5, B(Z)=B(H)=0.25. The results are more stringent than those previously obtained for single and pair production of VLQs coupled to light quarks.
dc.description.versionPeer Reviewed
dc.identifierPhys.Rev. D97 (2018) 072008 Phys. Rev. D 97 (2018) 072008; DOI 10.1103/PhysRevD.97.072008
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevD.97.072008
dc.identifier.urihttp://hdl.handle.net/10400.26/27409
dc.language.isoeng
dc.relationAdvanced Multi-Variate Analysis for New Physics Searches at the LHC
dc.titleSearch for vectorlike light-flavor quark partners in proton-proton collisions at $\sqrt s$ =8  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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