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  • Letter
  • Open Access

Hanbury-Brown–Twiss signature for clustered substructures probing primordial inhomogeneity in hot and dense QCD matter

Kenji Fukushima1,*, Yoshimasa Hidaka2,3,1,4,5,†, Katsuya Inoue6,7,8,‡, Kenta Shigaki9,7,10,§, and Yorito Yamaguchi9,10,∥

  • 1Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2KEK Theory Center, Tsukuba 305-0801, Japan
  • 3Graduate Institute for Advanced Studies, SOKENDAI, Tsukuba 305-0801, Japan
  • 4International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles (QUP), KEK, Tsukuba 305-0801, Japan
  • 5RIKEN iTHEMS, RIKEN, Wako 351-0198, Japan
  • 6Chemistry Program, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
  • 7International Institute for Sustainability with Knotted Chiral Meta Matter (SKCM2), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
  • 8Chirality Research Center (CResCent), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
  • 9Physics Program, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
  • 10Core of Research for the Energetic Universe (CORE-U), Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan

  • *fuku@nt.phys.s.u-tokyo.ac.jp
  • †hidaka@post.kek.jp
  • ‡kxi@hiroshima-u.ac.jp
  • §shigaki@hiroshima-u.ac.jp
  • ∥yorito@hiroshima-u.ac.jp
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Phys. Rev. C 109, L051903 – Published 7 May, 2024

DOI: https://doi.org/10.1103/PhysRevC.109.L051903

Abstract

We propose a novel approach to probe primordial inhomogeneity in hot and dense matter which could be realized in noncentral heavy-ion collisions. Although the Hanbury Brown and Twiss (HBT) interferometry is commonly used to infer the system size, the cluster size should be detected if substructures emerge in space. We demonstrate that a signal peak in the HBT two-particle correlation stands at the relative momentum corresponding to the spatial scale of pseudo one-dimensional modulation. We assess detectability using the data prepared by an event generator (AMPT model) with clustering implemented in the particle distribution.

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Phys. Rev. C 109, L051903– Published 7 May, 2024
  • Received 25 July 2023
  • Revised 11 March 2024
  • Accepted 16 April 2024
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