Search for a fermiophobic Higgs boson in the diphoton decay channel with the ATLAS detector

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作者
G. Aad
B. Abbott
J. Abdallah
S. Abdel Khalek
A. A. Abdelalim
O. Abdinov
B. Abi
M. Abolins
O. S. AbouZeid
H. Abramowicz
H. Abreu
E. Acerbi
B. S. Acharya
L. Adamczyk
D. L. Adams
T. N. Addy
J. Adelman
S. Adomeit
P. Adragna
T. Adye
S. Aefsky
J. A. Aguilar-Saavedra
M. Aharrouche
S. P. Ahlen
F. Ahles
A. Ahmad
M. Ahsan
G. Aielli
T. Akdogan
T. P. A. Åkesson
G. Akimoto
A. V. Akimov
A. Akiyama
M. S. Alam
M. A. Alam
J. Albert
S. Albrand
M. Aleksa
I. N. Aleksandrov
F. Alessandria
C. Alexa
G. Alexander
G. Alexandre
T. Alexopoulos
M. Alhroob
M. Aliev
G. Alimonti
J. Alison
B. M. M. Allbrooke
P. P. Allport
机构
[1] CERN,Department of Physics
[2] University at Albany,Department of Physics
[3] University of Alberta,Department of Physics
[4] Ankara University,Department of Physics
[5] Dumlupinar University,Division of Physics
[6] Gazi University,LAPP
[7] TOBB University of Economics and Technology,High Energy Physics Division
[8] Turkish Atomic Energy Authority,Department of Physics
[9] CNRS/IN2P3 and Université de Savoie,Department of Physics
[10] Argonne National Laboratory,Physics Department
[11] University of Arizona,Physics Department
[12] The University of Texas at Arlington,Institute of Physics
[13] University of Athens,Institute of Physics
[14] National Technical University of Athens,Vinca Institute of Nuclear Sciences
[15] Azerbaijan Academy of Sciences,Department for Physics and Technology
[16] Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA,Physics Division
[17] University of Belgrade,Department of Physics
[18] University of Belgrade,Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics
[19] University of Bergen,School of Physics and Astronomy
[20] Lawrence Berkeley National Laboratory and University of California,Department of Physics
[21] Humboldt University,Division of Physics
[22] University of Bern,Department of Physics Engineering
[23] University of Birmingham,Department of Physics
[24] Bogazici University,Dipartimento di Fisica
[25] Dogus University,Physikalisches Institut
[26] Gaziantep University,Department of Physics
[27] Istanbul Technical University,Department of Physics
[28] INFN Sezione di Bologna,Instituto de Fisica
[29] Università di Bologna,Physics Department
[30] University of Bonn,Departamento de Física
[31] Boston University,Cavendish Laboratory
[32] Brandeis University,Department of Physics
[33] Universidade Federal do Rio De Janeiro COPPE/EE/IF,Enrico Fermi Institute
[34] Federal University of Juiz de Fora (UFJF),Departamento de Física
[35] Federal University of Sao Joao del Rei (UFSJ),Departamento de Física
[36] Universidade de Sao Paulo,Institute of High Energy Physics
[37] Brookhaven National Laboratory,Department of Modern Physics
[38] National Institute of Physics and Nuclear Engineering,Department of Physics
[39] University Politehnica Bucharest,School of Physics
[40] West University in Timisoara,Laboratoire de Physique Corpusculaire
[41] Universidad de Buenos Aires,Nevis Laboratory
[42] University of Cambridge,Niels Bohr Institute
[43] Carleton University,Dipartimento di Fisica
[44] CERN,AGH University of Science and Technology
[45] University of Chicago,The Henryk Niewodniczanski Institute of Nuclear Physics
[46] Pontificia Universidad Católica de Chile,Physics Department
[47] Universidad Técnica Federico Santa María,Physics Department
[48] Chinese Academy of Sciences,Institut für Experimentelle Physik IV
[49] University of Science and Technology of China,Institut für Kern
[50] Nanjing University, und Teilchenphysik
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摘要
A search for a fermiophobic Higgs boson using diphoton events produced in proton-proton collisions at a centre-of-mass energy of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\sqrt{s}=7~\mbox{TeV}$\end{document} is performed using data corresponding to an integrated luminosity of 4.9 fb−1 collected by the ATLAS experiment at the Large Hadron Collider. A specific benchmark model is considered where all the fermion couplings to the Higgs boson are set to zero and the bosonic couplings are kept at the Standard Model values (fermiophobic Higgs model). The largest excess with respect to the background-only hypothesis is found at 125.5 GeV, with a local significance of 2.9 standard deviations, which reduces to 1.6 standard deviations when taking into account the look-elsewhere effect. The data exclude the fermiophobic Higgs model in the ranges 110.0–118.0 GeV and 119.5–121.0 GeV at 95 % confidence level.
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