{
  "annotation_id": "c9e20b6f-e358-4571-a83b-4ec94165715f",
  "date_created": "2026-02-17T05:53:24.322000Z",
  "date_modified": "2026-02-17T05:53:24.322000Z",
  "file_hash": "120f02d2675c9122e2b4a281a3a77a52dd42667c2dcac0222ddb7d2030a52db0",
  "private": false,
  "record": {
    "abstract": "We study the observable $v_0(p_T)$, which quantifies the relative change of $p_T$ spectra induced by event-by-event density fluctuations in the medium created in heavy-ion collisions. This quantity provides a direct measure of radial flow and serves as a probe of collectivity, complementing anisotropic flow coefficients. Using hydrodynamic model calculations, we predict the behavior of $v_0(p_T)$ and show that the scaled quantity $v_0(p_T)/v_0$ exhibits very little dependence on centrality and transport coefficients. We further find that the apparent influence of transport coefficients$-$particularly bulk viscosity$-$ on $v_0(p_T)$ largely originates from modifications of the event-averaged mean transverse momentum, $\\langle p_T \\rangle$. By expressing $v_0(p_T)/v_0$ as a function of $p_T/\\langle p_T \\rangle$, the genuine sensitivity of $v_0(p_T)$ to transport coefficients can be isolated. Moreover, since $v_0(p_T)$ is the $p_T$-differential measure of event-by-event $[p_T]$ fluctuations, it naturally explains the observed $p_T$-cut dependence of $\\sigma_{p_T}$ measured by ATLAS collaboration.",
    "arxiv_id": "2601.09890",
    "authors": [
      "Tribhuban Parida",
      "Rupam Samanta",
      "Jean-Yves Ollitrault"
    ],
    "categories": [
      "nucl-th",
      "hep-ph",
      "nucl-ex"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "title": "The collectivity of transverse momentum fluctuations",
    "url": "https://arxiv.org/abs/2601.09890",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d1839973-2ec4-4e38-a2d3-0b589030a1cb",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}