학술논문
Central Pb+Pb collisions at 158 A GeV/c studied by π-π- interferometry
Document Type
article
Author
Aggarwal, MM; Agnihotri, A; Ahammed, Z; Angelis, ALS; Antonenko, V; Arefiev, V; Astakhov, V; Avdeitchikov, V; Awes, TC; Baba, PVKS; Badyal, SK; Barlag, C; Bathe, S; Batiounia, B; Bernier, T; Bhalla, KB; Bhatia, VS; Blume, C; Bock, R; Bohne, EM; Böröcz, Z; Bucher, D; Buijs, A; Büsching, H; Carlen, L; Chalyshev, V; Chattopadhyay, S; Cherbatchev, R; Chujo, T; Claussen, A; Das, AC; Decowski, MP; Delagrange, H; Djordjadze, V; Donni, P; Doubovik, I; Dutt, S; Dutta Majumdar, MR; El Chenawi, K; Eliseev, S; Enosawa, K; Foka, P; Fokin, S; Ganti, MS; Garpman, S; Gavrishchuk, O; Geurts, FJM; Ghosh, TK; Glasow, R; Gupta, SK; Guskov, B; Gustafsson, HA; Gutbrod, HH; Higuchi, R; Hrivnacova, I; Ippolitov, M; Kalechofsky, H; Kamermans, R; Kampert, KH; Karadjev, K; Karpio, K; Kato, S; Kees, S; Klein-Bösing, C; Knoche, S; Kolb, BW; Kosarev, I; Koutcheryaev, I; Krümpel, T; Kugler, A; Kulinich, P; Kurata, M; Kurita, K; Kuzmin, N; Langbein, I; Lebedev, A; Lee, YY; Löhner, H; Luquin, L; Mahapatra, DP; Manko, V; Martin, M; Martínez, G; Maximov, A; Mgebrichvili, G; Miake, Y; Mir, MF; Mishra, GC; Miyamoto, Y; Mohanty, B; Morrison, D; Mukhopadhyay, DS; Naef, H; Nandi, BK; Nayak, SK; Nayak, TK; Neumaier, S; Nianine, A; Nikitine, V; Nikolaev, S
Source
European Physical Journal C. 16(3)
Subject
Language
Abstract
Two-particle correlations have been measured for identified π- from central 158 A GeV Pb+Pb collisions and fitted radii of about 7 fm in all dimensions have been obtained. A multi-dimensional study of the radii as a function of kT is presented, including a full correction for the resolution effects of the apparatus. The cross term R2out-long of the standard fit in the Longitudinally CoMoving System (LCMS) and the vL parameter of the generalised Yano-Koonin fit are compatible with 0, suggesting that the source undergoes a boost invariant expansion. The shapes of the correlation functions in Qinv and Qspace = √Q2x + Q2y + Q2z have been analyzed in detail. They are not Gaussian but better represented by exponentials. As a consequence fitting Gaussians to these correlation functions may produce different radii depending on the acceptance of the experimental setup used for the measurement.