Centrality Dependence of Neutral Pion Production in 158A GeV {sup 208}Pb+{sup 208}Pb Collisions

Journal Article · Sat Oct 31 23:00:00 EST 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.81.4087· OSTI ID:300099

Aggarwal, M M; Bhatia, V S ^[1]; Agnihotri, A; Bhalla, K B; Gupta, S K; Raniwala, R; Raniwala, S ^[2]; Ahammed, Z; Chattopadhyay, S; Das, A C; Dutta Majumdar, M R; Ganti, M S; Mukhopadhyay, D S; Nayak, T K; Sinha, B C; Trivedi, M D; Viyogi, Y P ^[3]; Angelis, A L; Donni, P; Foka, P ; Kalechofsky, H; Martin, M; Naef, H; Rosselet, L; Rubio, J M; Solomey, N; Voeroes, S ^[4]; Antonenko, V; Cherbatchev, R; Doubovik, I; Fokin, S; Ippolitov, M; Karadjev, K; Koutcheryaev, I; Lebedev, A; Manko, V; Mgebrichvili, G; Nianine, A; Sibiriak, I; Tsvetkov, A; Vinogradov, A ^[5]; Arefiev, V; Astakhov, V; Avdeitchikov, V; Baldine, A; Barabach, L; Batiounia, B; Chalyshev, V; Djordjadze, V; Frolov, V; Gavrishchuk, O; Guskov, B; Kosarev, I; Kuzmin, N; Maximov, A; Mehdiyev, R; Mikhalev, D; Myalkovski, V; Nikitine, V; Nikolaev, S; Nomokonov, P; Parfenov, A; Pavliouk, S; Roufanov, I; Shabratova, G; Slavine, N; Vodopianov, A ^[6]; Awes, T C; Kim, H; Plasil, F; Stankus, P; Young, G R ^[7]; Baba, P V; Badyal, S K; Rao, N K; Sambyal, S S ^[8]; Barlag, C; Bathe, S; Blume, C; Bohne, E; Boeroecz, Z K; Bucher, D; Buesching, H; Claussen, A; Glasow, R; Kampert, K; Kees, S; Kruempel, T; Pietzmann, T; Reygers, K; Santo, R; Schlagheck, H; Stueken, D ^[9]; Bernier, T; Gutbrod, H H; Luquin, L; Nayak, S K; Pinanaud, W; Retiere, F; Roy, C ^[10]; Bock, R; Kolb, B W; Langbein, I; Lee, Y Y; Neumaier, S; others, and

---

1. University of Panjab, Chandigarh 160014 (India)
2. University of Rajasthan, Jaipur 302004 (India)
3. Variable Energy Cyclotron Centre, Calcutta 700 064 (India)
4. University of Geneva, CH-1211 Geneva 4 (Switzerland)
5. RRC (Kurchatov), RU-123182 Moscow (Russia)
6. Joint Institute for Nuclear Research, RU-141980 Dubna (Russia)
7. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)
8. University of Jammu, Jammu 180001 (India)
9. University of Muenster, D-48149 Muenster (Germany)
10. SUBATECH, Ecole des Mines, Nantes (France)

The production of neutral pions in 158A GeV {sup 208}Pb+ {sup 208}Pb collisions has been studied in the WA98 experiment at the CERN Super Proton Synchrotron (SPS). Transverse momentum spectra are studied for the range 0.3{le}m{sub T}{minus}m{sub 0}{le}4.0 GeV /c . The results for central collisions are compared to various models. The centrality dependence of the neutral pion spectral shape and yield is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with greater than about 30thinspthinspparticipating nucleons. This is most naturally explained by assuming an equilibrated system. {copyright} {ital 1998} {ital The American Physical Society }

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-96OR22464; FC02-94ER40818
• OSTI ID: 300099
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CERN SPS SYNCHROTRON
HEAVY ION REACTIONS
LEAD
LEAD 208 REACTIONS
PARTICLE PRODUCTION
PIONS NEUTRAL
TRANSVERSE MOMENTUM