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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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