4. Nuclear Physics (CSN3)

Study of multiplicity evolution of charge dependent 3 particle correlation to probe jet-medium interaction in small collision systems

by Debojit Sarkar

Aula Leale (LNF INFN)

Aula Leale


We present a unique way to detect the jet-medium interaction in p+Pb collisions at 5.02 TeV using 3 particle correlation (C112) observable constructed with particles from low and intermediate pT (0.5 < pT < 10 GeV/c) region. In case of small collision systems, the intrinsic momentum scale of the low energy jets is comparable to the characteristic scale of the medium and therefore have a larger probability of interaction with the medium. The short range of the 3 particle correlation is dominated by the jet like correlation and has a unique charge dependence as observed in the minimum bias p+Au collisions at the RHIC energy. The similar effect has been observed in EPOS in the lower multiplicity classes of p+Pb collisions where jet fragmentation plays the dominant role. Interestingly, the charge dependence of the C112 gets diminished in the higher multiplicity classes of p+Pb collisions where the jet-medium interplay may have significant contribution. The results from EPOS and AMPT and JEWEL will be presented for both p+Pb and Pb+Pb collisions at the LHC energies. The effectiveness of this observable as a probe to study jet-medium interaction in small collision systems will also be discussed.