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Probing granular inhomogeneity of a particle-emitting source by imaging two-pion Bose–Einstein correlations

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Abstract

Using the source imaging technique in two-pion interferometry, we study the image of the hydrodynamic particle-emitting source with the HIJING initial conditions for relativistic heavy-ion collisions on an event-by-event basis. It is shown that the initial-state fluctuations may give rise to bumpy structures of the medium during hydrodynamical evolution, which affects the two-pion emission space and leads to a visible two-tiered shape in the source function imaged using the two-pion Bose–Einstein correlations. This two-tiered shape can be understood within a similar but more analytic granular source model and is found to be closely related to the introduced quantity \(\xi\), which characterizes the granular inhomogeneity of the source. By fitting the imaged source function with a granular source parametrization, we extract the granular inhomogeneity of the hydrodynamic source, which is found to be sensitive to both the Gaussian smearing width of the HIJING initial condition and the centrality of the collisions.

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Authors and Affiliations

  1. School of Mathematics and Economics, Hubei University of Education, Wuhan, 430205, Hubei, China

    Li-Ya Li & Ying Hu

  2. Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, 510006, China

    Peng Ru

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  1. Li-Ya Li
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  2. Peng Ru
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  3. Ying Hu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Li-Ya Li, Peng Ru, and Ying Hu. The first draft of the manuscript was written by Ying Hu, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ying Hu.

Additional information

This work was supported in part by the Research Start-up Funding of Hubei University of Education (No. 201801), Hubei Provincial Natural Science Foundation of China (No. 2020CFB697), the China Postdoctoral Science Foundation (No. 2019M652929), the MOE Key Laboratory of Quark and Lepton Physics (Central China Normal University) (No. QLPL201802).

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Li, LY., Ru, P. & Hu, Y. Probing granular inhomogeneity of a particle-emitting source by imaging two-pion Bose–Einstein correlations. NUCL SCI TECH 32, 19 (2021). https://doi.org/10.1007/s41365-021-00853-7

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