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Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment

2013Journal article Open access
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dc.contributor.authorATLAS collaboration (2900 authors)
dc.contributor.authorAguilar-Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAnjos, Nuno
dc.contributor.authorCantrill, Robert
dc.contributor.authorCarvalho, João
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muiño, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorDo Valle Wemans, André
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGonçalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorLopes, Lourenco
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amélia
dc.contributor.authorManeira, José
dc.contributor.authorOliveira, Miguel Alfonso
dc.contributor.authorOnofre, António
dc.contributor.authorPalma, Alberto
dc.contributor.authorPina, João Antonio
dc.contributor.authorPinto, Belmiro
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, João
dc.contributor.authorSilva, José
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-03T22:03:50Z
dc.date.available2019-02-03T22:03:50Z
dc.date.issued2013
dc.date.updated2019-02-03T22:03:50Z
dc.description.abstractIn several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson $H^+, t \to bH^+$, in addition to the Standard Model decay $t \to bW$. Since W bosons decay to the three lepton generations equally, while $H^+$ may predominantly decay into $\tau\nu$, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6/fb of proton-proton collision data at $\sqrt{s}$ = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or $\mu$) and/or a hadronically decaying $\tau (\tau_{had})$ are used. Event yield ratios between $e+\tau_{had}$ and $e+\mu$, as well as between $\mu+\tau_{had}$ and $\mu+e$, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction $B(H^+ \to \tau\nu)$ is 100%, upper limits in the range 3.2%-4.4% can be placed on the branching fraction $B(t \to bH^+)$ for charged Higgs boson masses $m_{H+}$ in the range 90-140 GeV. After combination with results from a search for charged Higgs bosons in ttbar decays using the $\tau_{had}$+jets final state, upper limits on $B(t \to bH^+)$ can be set in the range 0.8%-3.4%, for $m_{H+}$ in the range 90-160 GeV.
dc.description.versionPeer Reviewed
dc.identifierJHEP 1303 (2013) 076; DOI 10.1007/JHEP03(2013)076
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP03(2013)076
dc.identifier.urihttp://hdl.handle.net/10400.26/26346
dc.language.isoeng
dc.relationEuropean Grid Initiative: Integrated Sustainable Pan-European Infrastructure for Researchers in Europe
dc.titleSearch for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEuropean Grid Initiative: Integrated Sustainable Pan-European Infrastructure for Researchers in Europe
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/261323/EU
oaire.fundingStreamFP7
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspt
rcaap.typearticle
relation.isProjectOfPublication581c11bf-ae68-4acb-bdae-f350d90cb7f7
relation.isProjectOfPublication.latestForDiscovery581c11bf-ae68-4acb-bdae-f350d90cb7f7

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