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Adhikary, H.; Allison, K. K.; Amin, N.; Antićić, T.; Baszczyk, M.; Battaglia, D.; Bazgir, A.; Bielewicz, M.; Bogomilov, M.; Brandin, A.; Bryliński, W.; Buryakov, M.; Csanád, M.; Cybowska, J.; Czopowicz, T.; Davis, N.; Dorosz, P.; Fields, L.; Fodor, Z.; Garibov, A.; Golosov, O.; Golubeva, M.; Grebieszkow, K.; Guber, F.; Igolkin, S. N.; Ilieva, S.; Ivashkin, A.; Izvestnyy, A.; Kadija, K.; Kargin, N.; Karpushkin, N.; Kashirin, E.; Kiełbowicz, M.; Kitagawa, H.; Kolesnikov, R.; Koshio, Y.; Kozłowski, B.; Krasnoperov, A.; Kucewicz, W.; Kuchowicz, M.; Kurepin, A.; László, A.; Lykasov, G.; Lyubushkin, V. V.; Maćkowiak-Pawłowska, M.; Makhnev, A.; Maksiak, B.; Malakhov, A. I.; Marcinek, A.; Marton, K.; Mathes, H.-J.; Matulewicz, T.; Matveev, V.; Melkumov, G. L.; Merzlaya, A.; Mik, Ł.; Morozov, S.; Nagai, Y.; Nishimori, S.; Paolone, V.; Petukhov, O.; Pidhurskyi, I.; Płaneta, R.; Popov, B. A.; Pszczel, D.; Puzović, J.; Ren, L.; Ortiz, V. Z. Reyna; Rondio, E.; Roth, M.; Rumberger, B. T.; Rybczynski, M.; Rybicki, A.; Sakashita, K.; Schmidt, K.; Seryakov, A. Yu; Shah, U. A.; Słodkowski, M.; Staszel, P.; Stefanek, G.; Ströbele, H.; Šuša, T.; Świderski, Ł.; Szukiewicz, R.; Taranenko, A.; Tefelska, A.; Tefelski, D.; Tereshchenko, V.; Toia, A.; Tsenov, R.; Turko, L.; Tveter, T. S.; Urbaniak, M.; Valiev, F. F.; Veberič, D.; Vechernin, V. V.; Volkov, V.; Wójcik, K.; Zviagina, A.; Zwaska, R.
The European physical journal. C, Particles and fields, 10/2023, Volume: 83, Issue: 10Journal Article
This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum of 150 A GeV / c (energy available in the center-of-mass system for nucleon pair 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 α is approximately constant as a function of m T , 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 m T , which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter λ as a function of m T was observed, similar to previous NA44 S + Pb results (obtained with a Gaussian approximation, but unlike RHIC results).
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