Elsevier

Physics Letters B

Volume 743, 9 April 2015, Pages 15-34
Physics Letters B

Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at s=8TeV

https://doi.org/10.1016/j.physletb.2015.02.015Get rights and content
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Abstract

The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3fb1 of data collected in proton–proton collisions at s=8TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events is observed. Limits are reported on the product of the scalar boson production cross section times branching ratio into long-lived neutral particles as a function of the proper lifetime of the particles. Limits are reported for boson masses from 100 GeV to 900 GeV, and a long-lived neutral particle mass from 10 GeV to 150 GeV.

Keywords

High-energy collider experiment
Long-lived neutral particle
New physics

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 Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom.

e

Also at TRIUMF, Vancouver, BC, Canada.

f

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

g

Also at Tomsk State University, Tomsk, Russia.

h

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

i

Also at Università di Napoli Parthenope, Napoli, Italy.

j

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

k

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

l

Also at Chinese University of Hong Kong, China.

m

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

n

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

o

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

p

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

q

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

r

Also at CERN, Geneva, Switzerland.

s

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

t

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

u

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

v

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

w

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

x

Also at Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France.

y

Also at School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar, India.

z

Also at Dipartimento di Fisica, Sapienza Università di Roma, Roma, Italy.

aa

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

ab

Also at Section de Physique, Université de Genève, Geneva, Switzerland.

ac

Also at International School for Advanced Studies (SISSA), Trieste, Italy.

ad

Also at Department of Physics and Astronomy, University of South Carolina, Columbia, SC, United States.

ae

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

af

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

ag

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

ah

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

ai

Also at Department of Physics, Oxford University, Oxford, United Kingdom.

aj

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

ak

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

al

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

am

Also at Discipline of Physics, University of KwaZulu-Natal, Durban, South Africa.

an

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

Deceased.

E-mail address: [email protected].