TY - JOUR
T1 - Direct photon production and flow at low transverse momenta in pp, p–Pb and Pb–Pb collisions
AU - ALICE Collaboration
AU - Schmidt, Nicolas
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.
PY - 2018
Y1 - 2018
N2 - Low transverse momentum direct photon measurements have been carried out by the ALICE experiment at the CERN LHC in small collision systems (pp, √s = 2.76 and 8 TeV and p–Pb, √sNN = 5.02 TeV) as well as in heavy-ion collisions (Pb–Pb, √sNN = 2.76 TeV). For the first time, also the multiplicity dependence of direct photon production was investigated in p–Pb collisions. Whereas in the small systems no significant thermal photon signal was observed, a ∼ 15% excess has been measured in central Pb–Pb collisions in the region of pT < 3 GeV/c. A signal of prompt photon production at high transverse momentum consistent with binary scaling has been observed in all collision systems following NLO pQCD predictions. Direct photon flow has been measured in central and semi-central Pb–Pb collisions and found to be of similar size as the charged hadron and decay photon flow.
AB - Low transverse momentum direct photon measurements have been carried out by the ALICE experiment at the CERN LHC in small collision systems (pp, √s = 2.76 and 8 TeV and p–Pb, √sNN = 5.02 TeV) as well as in heavy-ion collisions (Pb–Pb, √sNN = 2.76 TeV). For the first time, also the multiplicity dependence of direct photon production was investigated in p–Pb collisions. Whereas in the small systems no significant thermal photon signal was observed, a ∼ 15% excess has been measured in central Pb–Pb collisions in the region of pT < 3 GeV/c. A signal of prompt photon production at high transverse momentum consistent with binary scaling has been observed in all collision systems following NLO pQCD predictions. Direct photon flow has been measured in central and semi-central Pb–Pb collisions and found to be of similar size as the charged hadron and decay photon flow.
UR - http://www.scopus.com/inward/record.url?scp=85072694561&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:85072694561
SN - 1824-8039
VL - 345
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 2018 International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Hard Probes 2018
Y2 - 30 September 2018 through 5 October 2018
ER -