Elsevier

Physics Letters B

Volume 763, 10 December 2016, Pages 313-336
Physics Letters B

Transverse momentum, rapidity, and centrality dependence of inclusive charged-particle production in sNN=5.02TeV p + Pb collisions measured by the ATLAS experiment

https://doi.org/10.1016/j.physletb.2016.10.053Get rights and content
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Abstract

Measurements of the per-event charged-particle yield as a function of the charged-particle transverse momentum and rapidity are performed using p+Pb collision data collected by the ATLAS experiment at the LHC at a centre-of-mass energy of sNN=5.02TeV. Charged particles are reconstructed over pseudorapidity |η|<2.3 and transverse momentum between 0.1GeV and 22GeV in a dataset corresponding to an integrated luminosity of 1μb1. The results are presented in the form of charged-particle nuclear modification factors, where the p+Pb charged-particle multiplicities are compared between central and peripheral p+Pb collisions as well as to charged-particle cross sections measured in pp collisions. The p+Pb collision centrality is characterized by the total transverse energy measured in 4.9<η<3.1, which is in the direction of the outgoing lead beam. Three different estimations of the number of nucleons participating in the p+Pb collision are carried out using the Glauber model and two Glauber–Gribov colour-fluctuation extensions to the Glauber model. The values of the nuclear modification factors are found to vary significantly as a function of rapidity and transverse momentum. A broad peak is observed for all centralities and rapidities in the nuclear modification factors for charged-particle transverse momentum values around 3GeV. The magnitude of the peak increases for more central collisions as well as rapidity ranges closer to the direction of the outgoing lead nucleus.

Cited by (0)

at

Also affiliated with PKU-CHEP.

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

g

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

h

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

i

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

j

Also at Tomsk State University, Tomsk, Russia.

k

Also at Universita di Napoli Parthenope, Napoli, Italy.

l

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

m

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

n

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

o

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

p

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

q

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

r

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

s

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

t

Also at Department of Physics, National Tsing Hua University, Taiwan.

u

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

v

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

w

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

x

Also at CERN, Geneva, Switzerland.

y

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

z

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

aa

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

ab

Also at Hellenic Open University, Patras, Greece.

ac

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

ad

Also at School of Physics, Shandong University, Shandong, China.

ae

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

af

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

ag

Also at Eotvos Lorand University, Budapest, Hungary.

ah

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

ai

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

aj

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

ak

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

al

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

am

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

an

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

ao

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

ap

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

aq

Also at Flensburg University of Applied Sciences, Flensburg, Germany.

ar

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

as

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

Deceased.

E-mail address: [email protected].