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Allison, K. K.; Amin, N.; Andronov, E. V.; Antićić, T.; Arsene, I.-C.; Bajda, M.; Balkova, Y.; Battaglia, D.; Bazgir, A.; Bhosale, S.; Bielewicz, M.; Blondel, A.; Bogomilov, M.; Bondar, Y.; Bostan, N.; Bryliński, W.; Brzychczyk, J.; Buryakov, M.; Camino, A. F.; Csanád, M.; Cybowska, J.; Czopowicz, T.; Davis, N.; Dmitriev, A.; Dominik, W.; Dorosz, P.; Engel, R.; Fields, L.; Fodor, Z.; Friend, M.; Garibov, A.; Gaździcki, M.; Golosov, O.; Grebieszkow, K.; Igolkin, S. N.; Izvestnyy, A.; Kargin, N.; Kashirin, E.; Kitagawa, H.; Kolesnikov, R.; Kolev, D.; Kozłowski, B.; Krasnoperov, A.; Kuchowicz, M.; Kuich, M.; Lewicki, M.; Lykasov, G.; Lyubushkin, V. V.; Maćkowiak-Pawłowska, M.; Majka, Z.; Makhnev, A.; Maksiak, B.; Marcinek, A.; Marino, A. D.; Marton, K.; Mathes, H.-J.; Melkumov, G. L.; Nakadaira, T.; Naskręt, M.; Nishimori, S.; Panova, O.; Petukhov, O.; Popov, B. A.; Pórfy, B.; Posiadała-Zezula, M.; Prokhorova, D. S.; Pszczel, D.; Puławski, S.; Puzović, J.; Ren, L.; Röhrich, D.; Rondio, E.; Roth, M.; Rozpłochowski, Ł.; Rumberger, B. T.; Rumyantsev, M.; Rustamov, A.; Rybczynski, M.; Sakashita, K.; Schmidt, K.; Seryakov, A. Yu; Shah, U. A.; Shiraishi, Y.; Shukla, A.; Słodkowski, M.; Staszel, P.; Stepaniak, J.; Strikhanov, M.; Šuša, T.; Świderski, Ł.; Szewiński, J.; Szukiewicz, R.; Taranenko, A.; Tefelski, D.; Tereshchenko, V.; Turko, L.; Veberič, D.; Wyszyński, O.; Zaitsev, A.; Zwaska, R.
The European physical journal. C, Particles and fields, 10/2023, Volume: 83, Issue: 10Journal Article
Abstract This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum of 150 $$A\,\hbox {GeV}\!/\!c$$ A GeV / c (energy available in the center-of-mass system for nucleon pair $$\sqrt{s_{\text {NN}}} = 16.84$$ s NN = 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 $$\alpha $$ α is approximately constant as a function of $$m_{\text {T}}$$ m T , and far from both the Gaussian case of $$\alpha = 2$$ α = 2 or the conjectured value at the critical endpoint, $$\alpha = 0.5$$ α = 0.5 . The radius scale parameter R shows a slight decrease in $$m_{\text {T}}$$ m T , which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter $$\lambda $$ λ as a function of $$m_{\text {T}}$$ m T was observed, similar to previous NA44 S + Pb results (obtained with a Gaussian approximation, but unlike RHIC results).
