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  • Jet modification via $\pi^0$-hadron correlations in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV
    PHENIX Collaboration; Alfred, M; Bai, M; Bandara, N. S; Baublis, V; Bazilevsky, A; Bickley, A. A; Chen, C. -H; Chen, D; Chi, C. Y; Connors, M; Dahms, T; Daugherity, M. S; Dubey, A. K; Durham, J. M; Dutta, D; Efremenko, Y. V; Fitzgerald, D; Fokin, S. L; Fraenkel, Z; Fukao, Y; Gallus, P; Garg, P; Garishvili, I; Goto, Y; de Cassagnac, R. Granier; Greene, S. V; Guo, T; Hahn, K. I; Han, R; Haruna, K; Hasegawa, S; Hodges, A; Hong, B; Hotvedt, N; Iinuma, H; Ikeda, Y; Ivanishchev, D; Jezghani, M; Jumper, D. S; Kanda, S; Khanzadeev, A; Kijima, K. M; Kim, B. I; Kim, G. W; Kim, M; Konno, M; Koster, J; Král, A; Lee, S. H; Liu, H; Love, B; Mašek, L; Means, N; Miake, Y; Mishra, D. K; Naglis, M; Nakamura, T; Nattrass, C; Newby, J; Novitzky, N; Oda, S. X; Ogilvie, C. A; Oka, M; Koop, J. D. Orjuela; Orosz, M; Osborn, J. D; Pereira, H; Perera, G. D. N; Peresedov, V; Peressounko, D. Yu; Purschke, M. L; Rak, J; Ravinovich, I; Richford, D; Rubin, J. G; Sakai, S; Sakashita, K; Sarsour, M; Schmoll, B. K; Sen, A; Sexton, A; Sickles, A; Silva, C. L; Smith, K. L; Sorensen, S. P; Stenlund, E; Sun, Z; Takagui, E. M; Tanida, K; Tannenbaum, M. J; Tomášek, L; Towell, C. L; Tsuchimoto, Y; Vale, C; Xia, B; Xue, L; Zajc, W. A; Zaudtke, O; Zhou, S

    arXiv (Cornell University), 06/2024
    Journal Article

    High-momentum two-particle correlations are a useful tool for studying jet-quenching effects in the quark-gluon plasma. Angular correlations between neutral-pion triggers and charged hadrons with transverse momenta in the range 4--12~GeV/$c$ and 0.5--7~GeV/$c$, respectively, have been measured by the PHENIX experiment in 2014 for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$~GeV. Suppression is observed in the yield of high-momentum jet fragments opposite the trigger particle, which indicates jet suppression stemming from in-medium partonic energy loss, while enhancement is observed for low-momentum particles. The ratio and differences between the yield in Au$+$Au collisions and $p$$+$$p$ collisions, $I_{AA}$ and $\Delta_{AA}$, as a function of the trigger-hadron azimuthal separation, $\Delta\phi$, are measured for the first time at the Relativistic Heavy Ion Collider. These results better quantify how the yield of low-$p_T$ associated hadrons is enhanced at wide angle, which is crucial for studying energy loss as well as medium-response effects.

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