A1 Journal article (refereed)
Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and d+Au collisions at √sNN = 200 GeV (2020)


PHENIX Collaboration. (2020). Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and d+Au collisions at √sNN = 200 GeV. Physical Review C, 102(5), Article 054910. https://doi.org/10.1103/PhysRevC.102.054910


JYU authors or editors


Publication details

All authors or editors: PHENIX Collaboration

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2020

Volume: 102

Issue number: 5

Article number: 054910

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.102.054910

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/73248

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2005.14270


Abstract

We present direct photon-hadron correlations in 200 GeV/A Au+Au, d+Au, and p+p collisions, for direct photon pT from 5–12 GeV/c, collected by the PHENIX Collaboration in the years from 2006 to 2011. We observe no significant modification of jet fragmentation in d+Au collisions, indicating that cold nuclear matter effects are small or absent. Hadrons carrying a large fraction of the quark's momentum are suppressed in Au+Au compared to p+p and d+Au. As the momentum fraction decreases, the yield of hadrons in Au+Au increases to an excess over the yield in p+p collisions. The excess is at large angles and at low hadron pT and is most pronounced for hadrons associated with lower momentum direct photons. Comparison to theoretical calculations suggests that the hadron excess arises from medium response to energy deposited by jets.


Keywords: particle physics; nuclear physics


Contributing organizations


Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2


Last updated on 2021-07-07 at 21:33