Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at sNN=2.76 TeV with the ATLAS detector
11 Ciudades y comunidades sostenibles
showers [parton]
nucl-ex
Atomic
2760 GeV-cms/nucleon
01 natural sciences
Settore FIS/04 - Fisica Nucleare e Subnucleare
High Energy Physics - Experiment
Physik
High Energy Physics - Experiment (hep-ex)
Particle and Plasma Physics
Pb+Pb collisions; ATLAS detector
11 Sustainable Cities and Communities
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Nuclear and High Energy Physics; Heavy Ion Scattering; Jet Fragmentation Function
Nuclear Experiment (nucl-ex)
Nuclear Experiment
Mathematical Physics
QC
Root-S(nn)=2.76 Tev
Physics
Settore FIS/01 - Fisica Sperimentale
dependence [impact parameter]
Particle and High Energy Physics
ATLAS
Nuclear and Plasma Physics
Nuclear & Particles Physics
fragmentation function [jet]
Settore FIS/01 - FISICA SPERIMENTALE
CERN LHC Coll
Physical Sciences
hadroproduction [jet]
Astronomical and Space Sciences
Particle Physics - Experiment
Nuclear and High Energy Physics
[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]
QC1-999
Mathematical sciences
FOS: Physical sciences
Transverse-Momentum Dependence
ddc:500.2
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
530
scattering [heavy ion]
0103 physical sciences
Fysik
Nuclear
ddc:530
longitudinal momentum [charged particle]
TRANSVERSE-MOMENTUM DEPENDENCE; LEAD-LEAD COLLISIONS; ROOT-S(NN)=2.76; TEV
Lead-Lead Collisions
lead
Science & Technology
hep-ex
Molecular
500
transverse momentum [charged particle]
LHC; High Energy Physics; ATLAS
QC Physics / fizika
anti-kT algorithm
Experimental High Energy Physics
experimental results
DOI:
10.1016/j.physletb.2014.10.065
Publication Date:
2014-11-04T11:08:51Z
AUTHORS (2876)
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 $\sqrt{s_{NN}} = 2.76$ TeV 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-$k_{t}$ 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 $p_{T}^{\mathrm{jet}}> 100$ GeV. Commensurate minimum $p_{\mathrm{T}}$ 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, $0.04 \lesssim z \lesssim 0.2$ and an enhancement in fragment yield for $z \lesssim 0.04$. A smaller, less significant enhancement is observed at large $z$ and large $p_{\mathrm{T}}$ in central collisions.<br/>17 pages plus author list + cover pages (32 pages total), 8 figures, 4 tables, published in Physics Letters B 739 (2014) 320-342. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2012-08/<br/>
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