Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector

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dc.contributor.author Barreiro Alonso, Fernando
dc.contributor.author Terrón Cuadrado, Juan
dc.contributor.author Glasman Kuguel, Claudia Beatriz
dc.contributor.author Peso, José del
dc.contributor.author Cantero, J.
dc.contributor.author Torre Pérez, Héctor
dc.contributor.author ATLAS Collaboration
dc.contributor.author Arnal, V.
dc.contributor.author De la Torre, H.
dc.contributor.author Llorente Merino, J.
dc.contributor.other UAM. Departamento de Física Teórica es_ES
dc.date.accessioned 2016-12-14T13:46:13Z
dc.date.available 2016-12-14T13:46:13Z
dc.date.issued 2015-10-07
dc.identifier.citation Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 749 (2015): 519-541 en_US
dc.identifier.issn 0370-2693 (print) es_ES
dc.identifier.issn 1873-2445 (online) es_ES
dc.identifier.uri http://hdl.handle.net/10486/675956
dc.description.abstract A search for the associated production of the Higgs boson with a top quark pair is performed in multilepton final states using 20.3 fb-1 of proton-proton collision data recorded by the ATLAS experiment at √s=8 TeV at the Large Hadron Collider. Five final states, targeting the decays H→WW*, ττ, and ZZ*, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons (e or μ) without a hadronically decaying τ lepton; three light leptons; two same-charge light leptons with a hadronically decaying τ lepton; four light leptons; and one light lepton and two hadronically decaying τ leptons. No significant excess of events is observed above the background expectation. The best fit for the tt-H production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1-1.2+1.4 times the SM expectation, and the observed (expected) upper limit at the 95% confidence level is 4.7 (2.4) times the SM rate. The p-value for compatibility with the background-only hypothesis is 1.8σ the expectation in the presence of a Standard Model signal is 0.9σ en_US
dc.description.sponsorship We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide en_US
dc.format.extent 23 pag. es_ES
dc.format.mimetype application/pdf en
dc.language.iso eng en
dc.publisher Elsevier B.V. en_US
dc.relation.ispartof Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics en_US
dc.rights © 2015 CERN for the benefit of the ATLAS Collaboration en_US
dc.title Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector en_US
dc.type article en
dc.subject.eciencia Física es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.physletb.2015.07.079 es_ES
dc.identifier.doi 10.1016/j.physletb.2015.07.079 es_ES
dc.identifier.publicationfirstpage 519 es_ES
dc.identifier.publicationlastpage 541 es_ES
dc.identifier.publicationvolume 749 es_ES
dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/246806 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion en
dc.rights.cc Reconocimiento es_ES
dc.rights.accessRights openAccess en
dc.authorUAM Peso Malagón, José Del (259287)
dc.authorUAM Glasman Kuguel, Claudia Beatriz (260933)
dc.authorUAM Terrón Cuadrado, Juan (259459)


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