https://doi.org/10.1140/epjc/s10052-018-6386-8
Regular Article - Experimental Physics
Search for lepton-flavour-violating decays of Higgs-like bosons
1
Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
2
Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
3
Center for High Energy Physics, Tsinghua University, Beijing, China
4
Univ. Grenoble Alpes, Univ. Savoie Mont-Blanc, CNRS/IN2P3-LAPP, Annecy, France
5
Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France
6
Aix-Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
7
LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
8
LPNHE, Sorbonne Université, Paris Diderot, Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
9
I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
10
Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
11
Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
12
Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
13
School of Physics, University College Dublin, Dublin, Ireland
14
INFN Sezione di Bari, Bari, Italy
15
INFN Sezione di Bologna, Bologna, Italy
16
INFN Sezione di Ferrara, Ferrara, Italy
17
INFN Sezione di Firenze, Florence, Italy
18
INFN Laboratori Nazionali di Frascati, Frascati, Italy
19
INFN Sezione di Genova, Genoa, Italy
20
INFN, Sezione di Milano-Bicocca, Milan, Italy
21
INFN Sezione di Milano, Milan, Italy
22
INFN Sezione di Cagliari, Monserrato, Italy
23
INFN Sezione di Padova, Padua, Italy
24
INFN Sezione di Pisa, Pisa, Italy
25
INFN Sezione di Roma Tor Vergata, Rome, Italy
26
INFN Sezione di Roma La Sapienza, Rome, Italy
27
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
28
Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
29
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
30
Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
31
National Center for Nuclear Research (NCBJ), Warsaw, Poland
32
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
33
Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia
34
Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
35
Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
36
Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
37
Yandex School of Data Analysis, Moscow, Russia
38
Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
39
Institute for High Energy Physics (IHEP), Protvino, Russia
40
ICCUB, Universitat de Barcelona, Barcelona, Spain
41
Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
42
European Organization for Nuclear Research (CERN), Geneva, Switzerland
43
Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
44
Physik-Institut, Universität Zürich, Zurich, Switzerland
45
NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
46
Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
47
University of Birmingham, Birmingham, UK
48
H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
49
Cavendish Laboratory, University of Cambridge, Cambridge, UK
50
Department of Physics, University of Warwick, Coventry, UK
51
STFC Rutherford Appleton Laboratory, Didcot, UK
52
School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
53
School of Physics and Astronomy, University of Glasgow, Glasgow, UK
54
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
55
Imperial College London, London, UK
56
School of Physics and Astronomy, University of Manchester, Manchester, UK
57
Department of Physics, University of Oxford, Oxford, UK
58
Massachusetts Institute of Technology, Cambridge, MA, USA
59
University of Cincinnati, Cincinnati, OH, USA
60
University of Maryland, College Park, MD, USA
61
Syracuse University, Syracuse, NY, USA
62
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
63
University of Chinese Academy of Sciences, Beijing, China
64
School of Physics and Technology, Wuhan University, Wuhan, China
65
Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
66
Departamento de Fisica, Universidad Nacional de Colombia, Bogotá, Colombia
67
Institut für Physik, Universität Rostock, Rostock, Germany
68
Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
69
National Research Centre Kurchatov Institute, Moscow, Russia
70
National University of Science and Technology “MISIS”, Moscow, Russia
71
National Research Tomsk Polytechnic University, Tomsk, Russia
72
Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
73
University of Michigan, Ann Arbor, USA
74
Los Alamos National Laboratory (LANL), Los Alamos, USA
* e-mail: chitsanu.khurewathanakul@epfl.ch
Received:
23
August
2018
Accepted:
29
October
2018
Published online:
12
December
2018
A search is presented for a Higgs-like boson with mass in the range 45 to 195
decaying into a muon and a tau lepton. The dataset consists of proton-proton interactions at a centre-of-mass energy of 8
, collected by the LHCb experiment, corresponding to an integrated luminosity of 2
. The tau leptons are reconstructed in both leptonic and hadronic decay channels. An upper limit on the production cross-section multiplied by the branching fraction at 95% confidence level is set and ranges from 22
for a boson mass of 45 to 4 for a mass of 195.
© CERN for the benefit of the LHCb collaboration, 2018
