Publication: Two-pion femtoscopic correlations in Be+Be collisions at √sNN=16.84 GeV measured by the NA61/SHINE at CERN
Дата
2023
Авторы
Adhikary, H.
Adrich, P.
Allison, K. K.
Amin, N.
Brandin, A.
Golosov, O.
Kargin, N.
Kashirin, E.
Strikhanov, M.
Taranenko, A.
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This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum of 150A GeV/c (energy available in the centerof-mass system for nucleon pair √sNN = 16.84 GeV) by the NA61/SHINE experiment at the CERN SPS accelerator. The obtained momentum space correlation functions can be well described by a Lévy distributed source model. The transverse mass dependence of the Lévy source parameters is presented, and their possible theoretical interpretations are discussed.The results show that the Lévy exponent α is approximately constant as a function of mT , and far from both the Gaussian case of α = 2 or the conjectured value at the critical endpoint, α = 0.5. The radius scale parameter R shows a slight decrease in mT , which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter λ as a function of mT was observed, similar to previous NA44 S + Pb results (obtained with a Gaussian approximation, but unlike RHIC results)
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Two-pion femtoscopic correlations in Be+Be collisions at √sNN=16.84 GeV measured by the NA61/SHINE at CERN / Adhikary, H. [et al.] // European Physical Journal C. - 2023. - 83. - № 10. - 10.1140/epjc/s10052-023-11997-8