Two-pion femtoscopic correlations in Be+Be collisions at \(\sqrt{s_{\textrm{NN}}} = 16.84\) GeV measured by the NA61/SHINE at CERN

• Published in: arXiv.org
• Main Authors: Adhikary, H, Amin, N, Andronov, E V, I -C Arsene, Bajda, M, Balkova, Y, Baszczyk, M, Battaglia, D, Bazgir, A, Bhosale, S, Bielewicz, M, Blondel, A, Bogomilov, M, Bondar, Y, Bryliński, W, Camino, A F, Ćirković, M, Csanád, M, Cybowska, J, Dmitriev, A, P von Doetinchem, Dorosz, P, Feofilov, G A, Fields, L, Fodor, Z, Friend, M, Gaździcki, M, Golosov, O, Golovatyuk, V, Golubeva, M, Grebieszkow, K, Igolkin, S N, Kargin, N, Karpushkin, N, Kashirin, E, Kiełbowicz, M, Kireyeu, V A, Koshio, Y, Kowalski, S, Kucewicz, W, Kuchowicz, M, Kurepin, A, László, A, Lewicki, M, Lykasov, G, Lyubushkin, V V, Maćkowiak-Pawłowska, M, Majka, Z, Makhnev, A, Malakhov, A I, Marcinek, A, Marino, A D, Marton, K, H -J Mathes, Merzlaya, A, Mik, Ł, Morawiec, A, Nagai, Y, Nishimori, S, Ozvenchuk, V, Panova, O, Płaneta, R, Podlaski, P, Popov, B A, Pórfy, B, Posiadała-Zezula, M, Pszczel, D, Puławski, S, Renfordt, R, Röhrich, D, Rondio, E, Roth, M, Rumberger, B T, Rumyantsev, M, Rustamov, A, Rybczynski, M, Schmidt, K, Seyboth, P, Shah, U A, Shiraishi, Y, Shukla, A, Słodkowski, M, Staszel, P, Stefanek, G, Šuša, T, Świderski, Ł, Szewiński, J, Tefelska, A, Tereshchenko, V, Tsenov, R, Turko, L, Unger, M, Valiev, F F, Veberič, D, Vechernin, V V, Wójcik, K, Wyszyński, O, Zaitsev, A, Zviagina, A, Zwaska, R
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 19.07.2024
• Subjects: CERN; Collisions; Momentum; Parameters; Pions; Relativistic Heavy Ion Collider; Synchrotrons
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2302.04593

This paper reports measurements of two-pion Bose-Einstein (HBT) correlations in Be+Be collisions at a beam momentum of 150\(A\,\mbox{GeV}/\textit{c}\) by the \(\mbox{NA61/SHINE}\) 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 \(\alpha\) is approximately constant as a function of \(m_{\rm{T}}\) , and far from both the Gaussian case of \(\alpha = 2\) or the conjectured value at the critical endpoint, \(\alpha = 0.5\). The radius scale parameter \(R\) shows a slight decrease in \(m_{\rm{T}}\), which can be explained as a signature of transverse flow. Finally, an approximately constant trend of the intercept parameter \(\lambda\) as a function of \(m_{\rm{T}}\) was observed, different from measurement results at RHIC.