Hanbury-Brown–Twiss correlation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ϕ</mml:mi><mml:mi>ϕ</mml:mi></mml:mrow></mml:math> with in-medium mass modification

We study the impacts of the squeezing effect caused by in-medium mass modification on the Hanbury- Brown–Twiss (HBT) correlation of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>ϕ</a:mi><a:mi>ϕ</a:mi></a:mrow></a:math> using a hydrodynamical source. The squeezing effect reduces the influence of transverse flow on the transverse distribution of the <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mi>ϕ</b:mi></b:math> emitting source while expanding the longitudinal source distribution. This trend becomes more noticeable as the transverse momentum increases, resulting in an enlargement of the HBT radii for <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mi>ϕ</c:mi><c:mi>ϕ</c:mi></c:mrow></c:math>. Notably, this enlargement is particularly evident with higher transverse pair momentum. As a result, the HBT radii of <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mrow><d:mi>ϕ</d:mi><d:mi>ϕ</d:mi></d:mrow></d:math> increase as the transverse pair momentum increases instead of showing a consistent decrease, showcasing the nonflow behavior of HBT radii in hydrodynamical sources. Both Gaussian fitting and Lévy fitting support the conclusion.