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Central Pb+Pb collisions at 158 A GeV/c studied by π-π- interferometry

  • Author(s): 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
  • et al.
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.

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