Elsevier

Physics Letters B

Volume 779, 10 April 2018, Pages 24-45
Physics Letters B

A search for resonances decaying into a Higgs boson and a new particle X in the XH  qqbb final state with the ATLAS detector

https://doi.org/10.1016/j.physletb.2018.01.042Get rights and content
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Abstract

A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb−1 of proton–proton collision data at s=13TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state XHqq¯bb¯ is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XHqq¯bb¯ resonance.

Cited by (0)

a

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

b

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

c

Also at Novosibirsk State University, Novosibirsk, Russia.

d

Also at TRIUMF, Vancouver BC, Canada.

e

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

f

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

g

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

h

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

i

Also at II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany.

j

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

k

Also at Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Portugal.

l

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

m

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

n

Also at Universita di Napoli Parthenope, Napoli, Italy.

o

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

p

Also at Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania.

q

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

r

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

s

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

t

Also at Centre for High Performance Computing, CSIR Campus, Rosebank, Cape Town, South Africa.

u

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

v

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

w

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

x

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

y

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

z

Also at Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany.

aa

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

ab

Also at Department of Physics, The University of Texas at Austin, Austin TX, United States of America.

ac

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

ad

Also at CERN, Geneva, Switzerland.

ae

Also at Georgian Technical University (GTU), Tbilisi, Georgia.

af

Also at Ochadai Academic Production, Ochanomizu University, Tokyo, Japan.

ag

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

ah

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

ai

Also at Departamento de Fisica Teorica y del Cosmos, Universidad de Granada, Granada, Spain.

aj

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

ak

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

al

Also at Departement de Physique Nucleaire et Corpusculaire, Université de Genève, Geneva, Switzerland.

am

Also at Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Barcelona, Spain.

an

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

ao

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

ap

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

aq

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

ar

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

as

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

at

Also at Giresun University, Faculty of Engineering, Turkey.

au

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

av

Also at Department of Physics, Nanjing University, Jiangsu, China.

aw

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

ax

Also at University of Malaya, Department of Physics, Kuala Lumpur, Malaysia.

Deceased.

E-mail address: [email protected].