Enhancement of baryon-to-meson ratios around jets as a signature of medium response

作者：Luo, Ao; Mao, Ya-Xian; Qin, Guang-You^*; Wang, En-Ke^*; Zhang, Han-Zhong^*

来源：Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics , 2023, 837: 137638.

DOI：10.1016/j.physletb.2022.137638

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• PARTON

We present a unique signal of jet-induced medium excitations: the enhancement of baryon-to-meson ratios around the quenched jets. To illustrate this, we study jet-particle correlations and the distributions of jet-induced identified particles with respect to the jet direction in Pb+Pb collisions at the LHC via a multi-phase transport model. We find a strong enhancement of baryon-to-meson ratios for associated particles at intermediate transverse momentum around the triggered jets in Pb+Pb collisions relative to p+p collisions, due to the coalescence of jet-excited medium partons. Since the lost energy from jets can diffuse to large angles, such baryon-to-meson-ratio enhancement is more pronounced for larger relative distance from the jet axis. We argue that the experimental confirmation of the enhancement of jet -induced baryon-to-meson ratios around the jets will provide an unambiguous evidence for the medium response to jet quenching in heavy-ion collisions.