Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √s=8 TeV

CMS Collaboration

doi:10.1007/JHEP02(2017)079

Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √s=8 TeV

CMS Collaboration

Laboratoire d’Annecy-le-Vieux de Physique des Particules
Plasma Physics Research Center
CERN
Scuola Superiore Meridionale (SSM)
A. Alikhanian Yerevan Institute of Physics
Austrian Academy of Sciences
TU Wien
Belarusian State University
University of Antwerp
Vrije Universiteit Brussel
Saha Institute of Nuclear Physics
Université libre de Bruxelles
Peking University
Ghent University
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Institut de Recherches Subatomiques
Universite de Mons
Centro Brasileiro de Pesquisas Físicas
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Universidade Federal do ABC
CNRS
Bulgarian Academy of Sciences
Sofia University St. Kliment Ohridski
Beihang University
CAS - Institute of High Energy Physics
German Electron Synchrotron
Universidad de los Andes Colombia
Universidad de Cantabria
University of Split
Ruder Boskovic Institute
University of Cyprus
Charles University
Joint Institute for Nuclear Research
Universidad San Francisco de Quito
Academy of Scientific Research and Technology
Helwan University
Zewail City of Science and Technology
Ain Shams University
Al-Fayoum University
The British University in Egypt
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Lappeenranta-Lahti University of Technology
Université Paris-Saclay
Laboratoire Leprince-Ringuet
Université de Haute-Alsace
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
Universite Claude Bernard Lyon 1
Lomonosov Moscow State University
Georgian Technical University
Ivane Javakhishvili Tbilisi State University
RWTH Aachen University
University of Hamburg
Brandenburg University of Technology
Karlsruhe Institute of Technology
Demokritos National Centre for Scientific Research
National and Kapodistrian University of Athens
University of Ioannina
Eötvös Loránd University
Wigner Research Centre for Physics
Institute for Nuclear Research
University of Debrecen
National Institute of Science Education and Research
Indian Institute of Science Education and Research Bhopal
Institute of Physics Bhubaneswar
Panjab University
University of Delhi
Indian Institute of Technology Madras
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research
University of Ruhuna
Indian Institute of Science Education and Research Pune
Institute for Research for Fundamental Sciences
Isfahan University of Technology
University of Tehran
Islamic Azad University
University College Dublin
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Benemerita Universidad Autonoma de Puebla
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The University of Auckland
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University of Warsaw
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Laboratório de Instrumentação e Física Experimental de Partículas
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Moscow Engineering Physics Institute
Petersburg Nuclear Physics Institute (PNPI)
Peter the Great St. Petersburg Polytechnic University
University of Florida
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37 Citas (Scopus)

Resumen

A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb⁻¹ at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Events in which a top quark pair is produced with one top quark decaying into a charm or up quark and a Higgs boson (H), and the other top quark decaying into a bottom quark and a W boson are selected. The Higgs boson in these events is assumed to subsequently decay into either dibosons or difermions. No significant excess is observed above the expected standard model background, and an upper limit at the 95% confidence level is set on the branching fraction ℬ(t → Hc) of 0.40% and ℬ(t → Hu) of 0.55%, where the expected upper limits are 0.43% and 0.40%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs boson Yukawa couplings |λ_tc ^H|² < 6.9 × 10^{− 3} and |λ_tu ^H|² < 9.8 × 10^{− 3}.[Figure not available: see fulltext.]

Idioma original	Inglés
Número de artículo	79
Publicación	Journal of High Energy Physics
Volumen	2017
N.º	2
DOI	https://doi.org/10.1007/JHEP02(2017)079
Estado	Publicada - 1 feb 2017
Publicado de forma externa	Sí

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title = "Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √s=8 TeV",

abstract = "A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb−1 at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Events in which a top quark pair is produced with one top quark decaying into a charm or up quark and a Higgs boson (H), and the other top quark decaying into a bottom quark and a W boson are selected. The Higgs boson in these events is assumed to subsequently decay into either dibosons or difermions. No significant excess is observed above the expected standard model background, and an upper limit at the 95\% confidence level is set on the branching fraction ℬ(t → Hc) of 0.40\% and ℬ(t → Hu) of 0.55\%, where the expected upper limits are 0.43\% and 0.40\%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs boson Yukawa couplings |λtc H|2 < 6.9 × 10− 3 and |λtu H|2 < 9.8 × 10− 3.[Figure not available: see fulltext.]",

keywords = "Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Higgs physics, Top physics",

author = "V. Khachatryan and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and M. Flechl and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and A. K{\"o}nig and I. Kr{\"a}tschmer and D. Liko and T. Matsushita and I. Mikulec and D. Rabady and N. Rad and B. Rahbaran and H. Rohringer and J. Schieck and J. Strauss and W. Treberer-Treberspurg and W. Waltenberger and Wulz, \{C. E.\} and V. Mossolov and N. Shumeiko and \{Suarez Gonzalez\}, J. and S. Alderweireldt and \{De Wolf\}, \{E. A.\} and X. Janssen and A. Knutsson and J. Lauwers and \{Van De Klundert\}, M. and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Remortel\}, N. and \{Van Spilbeeck\}, A. and \{Abu Zeid\}, S. and F. Blekman and J. D{\textquoteright}Hondt and N. Daci and S. Thakur and \{CMS Collaboration\}",

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AU - Adam, W.

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AB - A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb−1 at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Events in which a top quark pair is produced with one top quark decaying into a charm or up quark and a Higgs boson (H), and the other top quark decaying into a bottom quark and a W boson are selected. The Higgs boson in these events is assumed to subsequently decay into either dibosons or difermions. No significant excess is observed above the expected standard model background, and an upper limit at the 95% confidence level is set on the branching fraction ℬ(t → Hc) of 0.40% and ℬ(t → Hu) of 0.55%, where the expected upper limits are 0.43% and 0.40%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs boson Yukawa couplings |λtc H|2 < 6.9 × 10− 3 and |λtu H|2 < 9.8 × 10− 3.[Figure not available: see fulltext.]

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KW - Higgs physics

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JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

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ER -

Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √s=8 TeV

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