Elsevier

Physics Letters B

Volume 800, 10 January 2020, 135103
Physics Letters B

Combination of searches for Higgs boson pairs in pp collisions at s=13TeV with the ATLAS detector

https://doi.org/10.1016/j.physletb.2019.135103Get rights and content
Under a Creative Commons license
open access

Abstract

This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb1 of proton–proton collision data at a centre-of-mass energy s=13 TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bb¯bb¯, bb¯W+W, bb¯τ+τ, W+WW+W, bb¯γγ and W+Wγγ final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. No statistically significant excess in data above the Standard Model predictions is found. The combined observed (expected) limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 (10) times the predicted Standard Model cross-section. Limits are also set on the ratio (κλ) of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level in observation (expectation) to 5.0<κλ<12.0 (5.8<κλ<12.0). In addition, limits are set on the production of narrow scalar resonances and spin-2 Kaluza–Klein Randall–Sundrum gravitons. Exclusion regions are also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the Electroweak Singlet Model.

Cited by (0)

a

Also at Borough of Manhattan Community College, City University of New York, New York, NY; United States of America.

b

Also at CERN, Geneva; Switzerland.

c

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

d

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

e

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

f

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

g

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

h

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

i

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

j

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

k

Also at Department of Physics, Ben Gurion University of the Negev, Beer Sheva; Israel.

l

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

m

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

n

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

o

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

p

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

q

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

r

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

s

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

t

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

u

Also at Dipartimento di Matematica, Informatica e Fisica, Università di Udine, Udine; Italy.

v

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

w

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

x

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

y

Also at Hellenic Open University, Patras; Greece.

z

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

aa

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

ab

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

ac

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

ad

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

ae

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

af

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

ag

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

ah

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

ai

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

aj

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

ak

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

al

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

am

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

an

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

ao

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

ap

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

aq

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

ar

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

as

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

at

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

au

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

av

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

aw

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

ax

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

ay

Also at TRIUMF, Vancouver, BC; Canada.

az

Also at Universita di Napoli Parthenope, Napoli; Italy.

Deceased.

E-mail address: [email protected].