Two-pion femtoscopic correlations in Be+Be collisions at sNN=16.84 GeV measured by the NA61/SHINE at CERN

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2023-10, Vol.83 (10), p.919
• Main Authors: 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.
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; CERN; Collaboration; Collisions; Correlation; Elementary Particles; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Momentum; Nuclear Energy; Nuclear Physics; Nuclear research; Parameters; Physics; Physics and Astronomy; Pions; Quantum Field Theories; Quantum Field Theory; Quarks; Regular Article - Experimental Physics; Relativistic Heavy Ion Collider; Statistical analysis; String Theory; Synchrotrons
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-023-11997-8

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).