Elsevier

Physics Letters B

Volume 800, 10 January 2020, 135069
Physics Letters B

Searches for lepton-flavour-violating decays of the Higgs boson in s=13 TeV pp collisions with the ATLAS detector

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Abstract

This Letter presents direct searches for lepton flavour violation in Higgs boson decays, Heτ and Hμτ, performed with the ATLAS detector at the LHC. The searches are based on a data sample of proton–proton collisions at a centre-of-mass energy s=13 TeV, corresponding to an integrated luminosity of 36.1 fb1. No significant excess is observed above the expected background from Standard Model processes. The observed (median expected) 95% confidence-level upper limits on the lepton-flavour-violating branching ratios are 0.47% (0.340.10+0.13%) and 0.28% (0.370.10+0.14%) for Heτ and Hμτ, respectively.

Cited by (0)

a

Also at CERN, Geneva; Switzerland.

b

Also at CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille; France.

c

Also at Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève; Switzerland.

d

Also at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona; Spain.

e

Also at Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Lisboa; Portugal.

f

Also at Department of Applied Physics and Astronomy, University of Sharjah, Sharjah; United Arab Emirates.

g

Also at Department of Financial and Management Engineering, University of the Aegean, Chios; Greece.

h

Also at Department of Physics and Astronomy, Michigan State University, East Lansing MI; United States of America.

i

Also at Department of Physics and Astronomy, University of Louisville, Louisville, KY; United States of America.

j

Also at Department of Physics, California State University, East Bay; United States of America.

k

Also at Department of Physics, California State University, Fresno; United States of America.

l

Also at Department of Physics, California State University, Sacramento; United States of America.

m

Also at Department of Physics, King's College London, London; United Kingdom.

n

Also at Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg; Russia.

o

Also at Department of Physics, Stanford University, Stanford CA; United States of America.

p

Also at Department of Physics, University of Adelaide, Adelaide; Australia.

q

Also at Department of Physics, University of Fribourg, Fribourg; Switzerland.

r

Also at Department of Physics, University of Michigan, Ann Arbor MI; United States of America.

s

Also at Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow; Russia.

t

Also at Giresun University, Faculty of Engineering, Giresun; Turkey.

u

Also at Graduate School of Science, Osaka University, Osaka; Japan.

v

Also at Hellenic Open University, Patras; Greece.

w

Also at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona; Spain.

x

Also at Institut für Experimentalphysik, Universität Hamburg, Hamburg; Germany.

y

Also at Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen; Netherlands.

z

Also at Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia; Bulgaria.

aa

Also at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest; Hungary.

ab

Also at Institute of Particle Physics (IPP); Canada.

ac

Also at Institute of Physics, Academia Sinica, Taipei; Taiwan.

ad

Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku; Azerbaijan.

ae

Also at Institute of Theoretical Physics, Ilia State University, Tbilisi; Georgia.

af

Also at Instituto de Fisica Teorica, IFT-UAM/CSIC, Madrid; Spain.

ag

Also at Istanbul University, Dept. of Physics, Istanbul; Turkey.

ah

Also at Joint Institute for Nuclear Research, Dubna; Russia.

ai

Also at LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay; France.

aj

Also at Louisiana Tech University, Ruston LA; United States of America.

ak

Also at LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris; France.

al

Also at Manhattan College, New York NY; United States of America.

am

Also at Moscow Institute of Physics and Technology State University, Dolgoprudny; Russia.

an

Also at National Research Nuclear University MEPhI, Moscow; Russia.

ao

Also at Physics Department, An-Najah National University, Nablus; Palestine.

ap

Also at Physics Dept, University of South Africa, Pretoria; South Africa.

aq

Also at Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg; Germany.

ar

Also at School of Physics, Sun Yat-sen University, Guangzhou; China.

as

Also at The City College of New York, New York NY; United States of America.

at

Also at The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing; China.

au

Also at Tomsk State University, Tomsk, and Moscow Institute of Physics and Technology State University, Dolgoprudny; Russia.

av

Also at TRIUMF, Vancouver BC; Canada.

aw

Also at Universita di Napoli Parthenope, Napoli; Italy.

Deceased.

E-mail address: [email protected].