Squeezed Fermion Back-to-Back Correlation for Expanding Sources

Squeezed Fermion Back-to-Back Correlation for Expanding Sources

The interaction between particles and their surrounding medium can induce a squeezed back-to-back correlation between particles and antiparticles. In this paper, the squeezed fermion back-to-back correlation (fBBC) for expanding sources is studied. The formulas of the fBBC correlation function of fe...

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Bibliographic Details
Main Author: Yong Zhang
Format: Article
Language:English
Published: MDPI AG 2025-05-01
Series:Universe
Subjects:
fermion back-to-back correlation
fermions and antifermions
proton–antiproton
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Online Access:https://www.mdpi.com/2218-1997/11/6/166
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Summary:The interaction between particles and their surrounding medium can induce a squeezed back-to-back correlation between particles and antiparticles. In this paper, the squeezed fermion back-to-back correlation (fBBC) for expanding sources is studied. The formulas of the fBBC correlation function of fermion–antifermion pairs for expanding sources are given. The expanding flow leads to a decrease in the fBBC of proton–antiproton pairs and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mo>Λ</mo></semantics></math></inline-formula>-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover><mo>Λ</mo><mo stretchy="false">¯</mo></mover></semantics></math></inline-formula> pairs in the high-momentum region, an increase in the fBBC in the low-momentum region, and a narrowing width of the fBBC varies with in-medium mass in the low-momentum region. Even though the expanding flow influences fBBC, the fBBC of proton–antiproton pairs and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mo>Λ</mo></semantics></math></inline-formula>-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover><mo>Λ</mo><mo stretchy="false">¯</mo></mover></semantics></math></inline-formula> pairs can still offer possible observation signals as the collision energy varies from a few GeV to 200 GeV.
ISSN:2218-1997

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