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Abstract: A search is presented for a standard model-like Higgs boson decaying to the µ+µ- or e+e- final states based on proton–proton collisions recorded by the CMS experiment at the CERN LHC. The data correspond to integrated luminosities of 5.0 fb-1 at a centre-of-mass energy of 7TeV and 19.7 fb-1 at 8 TeV for the µ+µ-search, and of 19.7fb-1 at 8 TeV for the e+e-search. Upper limits on the production cross section times branching fraction at the 95% confidence level are reported for Higgs boson masses in the range from 120 to 150 GeV. For a Higgs boson with a mass of 125 GeV decaying to µ+µ-, the observed (expected) upper limit on the production rate is found to be 7.4 (6.5+2.8-1.9) times the standard model value. This corresponds to an upper limit on the branching fraction of 0.0016. Similarly, for e+e-, an upper limit of 0.0019 is placed on the branching fraction, which is ˜3.7 ×105 times the standard model value. These results, together with recent evidence of the 125GeV boson coupling to t-leptons with a larger branching fraction consistent with the standard model, confirm that the leptonic couplings of the new boson are not flavour-universal.
Fuente: Physics Letters B, Vol. 744, Pp. 184–207, (2015)
Publisher: Elsevier
Publication date: 01/05/2015
No. of pages: 24
Publication type: Article
DOI: 10.1016/j.physletb.2015.03.048
ISSN: 0370-2693,1873-2445
Spanish project: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01
Publication Url: https://doi.org/10.1016/j.physletb.2015.03.048
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KHACHATRYAN, VLADIMIR
JAVIER ANDRES BROCHERO CIFUENTES
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
JORGE DUARTE CAMPDERROS
MARCOS FERNANDEZ GARCIA
GERVASIO GOMEZ GRAMUGLIO
ALBERTO GRAZIANO
MARIA AMPARO LOPEZ VIRTO
JESUS MARCO DE LUCAS
RAFAEL JOSE MARCO DE LUCAS
CELSO MARTINEZ RIVERO
FRANCISCO MATORRAS WEINIG
FRANCISCA JAVIELA MUÑOZ SANCHEZ
JONATAN PIEDRA GOMEZ
MARIA TERESA RODRIGO ANORO
ANA YAIZA RODRIGUEZ MARRERO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
IVAN VILA ALVAREZ
ROCIO VILAR CORTABITARTE
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