Jet-like correlations with direct-photon and neutral-pion triggers at
© 2016 The Author(s) Azimuthal correlations of charged hadrons with direct-photon (γ dir ) and neutral-pion (π 0 ) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at s NN =200 GeV in the STAR experiment. The charged-hadron per-trigger yields at mid-rapidity from central Au+Au collisions are compared with p+p collisions to quantify the suppression in Au+Au collisions. The suppression of the away-side associated-particle yields per γ dir trigger is independent of the transverse momentum of the trigger particle (p T trig ), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (p T assoc ). Within uncertainty, similar levels of suppression are observed for γ dir and π 0 triggers as a function of z T (≡p T assoc /p T trig ). The results are compared with energy-loss-inspired theoretical model predictions. Our studies support previous conclusions that the lost energy reappears predominantly at low transverse momentum, regardless of the trigger energy.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Texas A&M Univ., College Station, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC) - National Energy Research Scientific Computing Center (NERSC); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); Russian Federation - Ministry of Education and Science
- Contributing Organization:
- STAR Collaboration
- Grant/Contract Number:
- SC0015636; SC00112704; AC02-06CH11357; AC02-05CH11231
- OSTI ID:
- 1273672
- Alternate ID(s):
- OSTI ID: 1340404; OSTI ID: 1345836; OSTI ID: 1377486; OSTI ID: 1559834
- Report Number(s):
- BNL-113188-2016-JA; S0370269316303872; PII: S0370269316303872
- Journal Information:
- Physics Letters. B, Journal Name: Physics Letters. B Vol. 760 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
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