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

STAR Collaboration

Research output: Contribution to journalArticle

26 Citations (Scopus)

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 (pT trig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pT assoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pT assoc/pT 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.

Original languageEnglish
Pages (from-to)689-696
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume760
DOIs
Publication statusPublished - Sep 10 2016

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pions
actuators
photons
retarding
transverse momentum
collisions
hadrons
energy dissipation
energy
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Jet-like correlations with direct-photon and neutral-pion triggers at sNN=200 GeV. / STAR Collaboration.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 760, 10.09.2016, p. 689-696.

Research output: Contribution to journalArticle

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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 (pT trig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pT assoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pT assoc/pT 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.",
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N2 - 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 (pT trig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pT assoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pT assoc/pT 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.

AB - 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 (pT trig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pT assoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pT assoc/pT 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.

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