---
title: "Effects of Parton Pair Correlations on Direct-Photon Yields and Elliptic Flow in Heavy-Ion Collisions"
source: "arXiv AI/CL/LG（论文）"
source_tier: "t2"
url: "https://arxiv.org/abs/2611.05042v1"
permalink: "https://feed.astralor.com/items/itm_c32aef09f94cf52c0c1b8b41"
published: "2026-11-03T15:12:24.000Z"
score: 56
channel: "ai"
tags: ["Effects","Parton Pair Correlations","Direct-Photon Yields","Elliptic Flow","Heavy-Ion Collisions Direct","Yet","Direct"]
---

# Effects of Parton Pair Correlations on Direct-Photon Yields and Elliptic Flow in Heavy-Ion Collisions

## At a glance

Direct photons escape heavy-ion collisions with little rescattering, carrying information from the full emission history. Yet describing the measured direct-photon yield and the sizable elliptic flow $v_2$ together rema…

## Key points

- Direct photons escape heavy-ion collisions with little rescattering, carrying information from the full emission history.
- Yet describing the measured direct-photon yield and the sizable elliptic flow $v_2$ together remains a long-standing challenge.
- Here we explore how correlations between emitting partons may affect both observables.

## Full text

Direct photons escape heavy-ion collisions with little rescattering, carrying information from the full emission history. Yet describing the measured direct-photon yield and the sizable elliptic flow $v_2$ together remains a long-standing challenge. Here we explore how correlations between emitting partons may affect both observables. The local $2\to2$ photon rate depends on the joint distribution of incoming partons, so a connected correlation between them can change photon emission without changing the one-particle distribution of medium particles. Once folded over the evolving medium in Au+Au and Pb+Pb collisions, the correlation raises the photon yield toward the fitted PHENIX and ALICE data and increases $v_2$ mainly at intermediate $p_T$. The fitted temperature dependence accounts for most of the net flow increase in this region, suggesting that the correlation changes the relative contributions between hotter and cooler regions.

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