English

Correlation between particle spectra and elliptic flow

Nuclear Theory 2025-07-22 v2 High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment

Abstract

We introduce a new observable to probe the collective nature of the radial expansion of the quark-gluon plasma. This observable, dubbed v02(pT)v_{02}(p_T), represents the correlation of the spectrum with elliptic flow, in the same way as the recently measured v0(pT)v_0(p_T) represents the correlation of the spectrum with the transverse momentum per particle. The advantage of v02(pT)v_{02}(p_T) over v0(pT)v_0(p_T) is that it is measured using a three-particle cumulant, as opposed to a pair correlation, which significantly reduces the sensitivity to nonflow effects. We predict non-trivial differences between v02(pT)v_{02}(p_T) and v0(pT)v_0(p_T) in semi-central Pb+Pb collisions at the Large Hadron Collider (LHC) on the basis of hydrodynamic simulations. A hint of these differences can be seen in the modification of pTp_T spectra observed by ALICE in event-shape-engineered events.

Keywords

Cite

@article{arxiv.2506.18690,
  title  = {Correlation between particle spectra and elliptic flow},
  author = {Tribhuban Parida and Rupam Samanta and Jean-Yves Ollitrault},
  journal= {arXiv preprint arXiv:2506.18690},
  year   = {2025}
}
R2 v1 2026-07-01T03:29:34.196Z