TY - JOUR
T1 - Measurement of jet radial profiles in Pb–Pb collisions at sNN=2.76 TeV
AU - ALICE Collaboration
AU - Acharya, S.
AU - Andrews, H.A.
AU - Evans, D.
AU - Graham, K.L.
AU - Jevons, O.
AU - Jones, P.G.
AU - Jusko, A.
AU - Krivda, M.
AU - Kvapil, J.
AU - Lietava, R.
AU - Villalobos Baillie, O.
AU - Willsher, E.
AU - Zardoshti, N.
PY - 2019/9/10
Y1 - 2019/9/10
N2 - The jet radial structure and particle transverse momentum (p
T) composition within jets are presented in centrality-selected Pb–Pb collisions at s
NN=2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R=0.3 at midrapidity |η
ch jet|<0.6 for transverse momenta p
T,ch jet=30–120 GeV/c. Jet–hadron correlations in relative azimuth and pseudorapidity space (Δφ,Δη) are measured to study the distribution of the associated particles around the jet axis for different p
T,assoc-ranges between 1 and 20 GeV/c. The data in Pb–Pb collisions are compared to reference distributions for pp collisions, obtained using embedded PYTHIA simulations. The number of high-p
T associate particles (4<p
T,assoc<20 GeV/c) in Pb–Pb collisions is found to be suppressed compared to the reference by 30 to 10%, depending on centrality. The radial particle distribution relative to the jet axis shows a moderate modification in Pb–Pb collisions with respect to PYTHIA. High-p
T associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low-p
T associate particles tend to be broadened. The results, which are presented for the first time down to p
T,ch jet=30 GeV/c in Pb–Pb collisions, are compatible with both previous jet–hadron-related measurements from the CMS Collaboration and jet shape measurements from the ALICE Collaboration at higher p
T, and add further support for the established picture of in-medium parton energy loss.
AB - The jet radial structure and particle transverse momentum (p
T) composition within jets are presented in centrality-selected Pb–Pb collisions at s
NN=2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R=0.3 at midrapidity |η
ch jet|<0.6 for transverse momenta p
T,ch jet=30–120 GeV/c. Jet–hadron correlations in relative azimuth and pseudorapidity space (Δφ,Δη) are measured to study the distribution of the associated particles around the jet axis for different p
T,assoc-ranges between 1 and 20 GeV/c. The data in Pb–Pb collisions are compared to reference distributions for pp collisions, obtained using embedded PYTHIA simulations. The number of high-p
T associate particles (4<p
T,assoc<20 GeV/c) in Pb–Pb collisions is found to be suppressed compared to the reference by 30 to 10%, depending on centrality. The radial particle distribution relative to the jet axis shows a moderate modification in Pb–Pb collisions with respect to PYTHIA. High-p
T associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low-p
T associate particles tend to be broadened. The results, which are presented for the first time down to p
T,ch jet=30 GeV/c in Pb–Pb collisions, are compatible with both previous jet–hadron-related measurements from the CMS Collaboration and jet shape measurements from the ALICE Collaboration at higher p
T, and add further support for the established picture of in-medium parton energy loss.
UR - http://www.scopus.com/inward/record.url?scp=85069829100&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.07.020
DO - 10.1016/j.physletb.2019.07.020
M3 - Article
SN - 0370-2693
VL - 796
SP - 204
EP - 219
JO - Physics Letters B
JF - Physics Letters B
ER -