Azimuthal correlations of charged hadrons with direct-photon ( γdir ) and neutral-pion ( π0 ) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at sNN=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 γdir trigger is independent of the transverse momentum of the trigger particle ( pTtrig ), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons ( pTassoc ). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT ( ≡pTassoc/pTtrig ). 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.

Jet-like correlations with direct-photon and neutral-pion triggers at s NN =200 GeV

di Ruzza, B.;
2016-01-01

Abstract

Azimuthal correlations of charged hadrons with direct-photon ( γdir ) and neutral-pion ( π0 ) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at sNN=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 γdir trigger is independent of the transverse momentum of the trigger particle ( pTtrig ), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons ( pTassoc ). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT ( ≡pTassoc/pTtrig ). 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11369/426670
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