Speaker
Description
Jet quenching is recognized as critical evidence for the existence of the quark-gluon plasma (QGP) and serves as an essential probe to study its transport properties. Measurements of hadron-triggered semi-inclusive recoil jets has gained popularity due to its capability to probe jets over an extended phase space at low transverse momenta ($p_T$) and large radii. Recent ALICE measurements showed that the $I_{AA}$, yield ratio of recoil jets between heavy-ion and p+p collisions, rises with jet $p_T$ and exceeds unity at high $p_T$, contradicting conventional expectations that jet quenching should result in $I_{AA}$ values less than one. In this talk, we re-examine the surface bias and study the effects of energy losses for both trigger hadrons and recoil jets on $I_{AA}$, employing the Linear Boltzmann Transport (LBT) model to simulate jet-medium interactions. Our findings suggest that a large portion of hadron triggers undergo substantial energy loss despite also experiencing a slight surface bias. This energy loss of the trigger hadrons elevates the $I_{AA}$ baseline, evaluated by removing energy loss for recoil jets, to be greatly larger than unity. This enhancement of the baseline implies that the measured $I_{AA}$ values larger than unity could still signal jet quenching, aligning with other related experimental observations.
References
Y. He, M. Nie, S. Cao, R. Ma, L. Yi and H. Caines, Phys. Lett. B 854 (2024) 138739
| Category | Theory |
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