Elsevier

Physics Letters B

Volume 739, 12 December 2014, Pages 320-342
Physics Letters B

Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at sNN=2.76TeV with the ATLAS detector

https://doi.org/10.1016/j.physletb.2014.10.065Get rights and content
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Abstract

Measurements of charged-particle fragmentation functions of jets produced in ultra-relativistic nuclear collisions can provide insight into the modification of parton showers in the hot, dense medium created in the collisions. ATLAS has measured jets in sNN=2.76TeV Pb+Pb collisions at the LHC using a data set recorded in 2011 with an integrated luminosity of 0.14 nb−1. Jets were reconstructed using the anti-kt algorithm with distance parameter values R=0.2,0.3,and 0.4. Distributions of charged-particle transverse momentum and longitudinal momentum fraction are reported for seven bins in collision centrality for R=0.4 jets with pTjet>100GeV. Commensurate minimum pT values are used for the other radii. Ratios of fragment distributions in each centrality bin to those measured in the most peripheral bin are presented. These ratios show a reduction of fragment yield in central collisions relative to peripheral collisions at intermediate z values, 0.04z0.2, and an enhancement in fragment yield for z0.04. A smaller, less significant enhancement is observed at large z and large pT in central collisions.

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

d

Also at TRIUMF, Vancouver, BC, Canada.

e

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

f

Also at Tomsk State University, Tomsk, Russia.

g

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

h

Also at Università di Napoli Parthenope, Napoli, Italy.

i

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

j

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

k

Also at Chinese University of Hong Kong, China.

l

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

m

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

n

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

o

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

p

Also at CERN, Geneva, Switzerland.

q

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

r

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

s

Also at Novosibirsk State University, Novosibirsk, Russia.

t

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

u

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

v

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

w

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

x

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

y

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

z

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

aa

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

ab

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

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 Moscow Engineering and Physics Institute (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].