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Measurement of medium-induced acoplanarity in central Au-Au and pp collisions at √sNN=200 GeV using direct-photon+jet and 𝜋0+ jet correlations

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The STAR Collaboration reports measurements of acoplanarity using semi-inclusive distributions of charged-particle jets recoiling from direct photon and 𝜋0 triggers, in central Au-Au and 𝑝⁢𝑝 collisions at √𝑠NN=200 GeV. Significant medium-induced acoplanarity broadening is observed for large but not...

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Bibliographic Details
Main Authors: Aboona, Bassam (Author) , Deppner, Ingo Martin (Author) , Herrmann, Norbert (Author) , Leung, Yue (Author) , Söhngen, Yannick (Author)
Corporate Author: STAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 8 January, 2026
In: Physical review
Year: 2026, Volume: 113, Issue: 1, Pages: 1-13
ISSN:2469-9993
DOI:10.1103/k29c-d5ry
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/k29c-d5ry
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/k29c-d5ry
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Author Notes:STAR Collaboration*
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Summary:The STAR Collaboration reports measurements of acoplanarity using semi-inclusive distributions of charged-particle jets recoiling from direct photon and 𝜋0 triggers, in central Au-Au and 𝑝⁢𝑝 collisions at √𝑠NN=200 GeV. Significant medium-induced acoplanarity broadening is observed for large but not small recoil jet resolution parameter, corresponding to recoil jet yield enhancement up to a factor of ≈20 for trigger-recoil azimuthal separation far from 𝜋. This phenomenology is indicative of the response of the quark-gluon plasma to excitation, but not the scattering of jets off of its quasiparticles. The measurements are not well described by current theoretical models which incorporate jet quenching.
Item Description:Veröffentlicht: 8. Januar 2026
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol
Im Titel ist die Zahl "0" hochgestellt
*STAR Collaboration: B.E. Aboona, I.M. Deppner, N. Herrmann, Y.H. Leung, Y. Söhngen [und 389 weitere Personen]
Gesehen am 20.04.2026
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/k29c-d5ry

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