Eur. Phys. J. C 18, 651-663
DOI: 10.1007/s100520100578
Scaling of particle and transverse energy production
in 208Pb + 208Pb collisions at 158
GeV
The WA98 Collaboration M.M. Aggarwal1, A. Agnihotri2, Z. Ahammed3, A.L.S. Angelis4, V. Antonenko5, V. Arefiev6, V. Astakhov6, V. Avdeitchikov6, T.C. Awes7, P.V.K.S. Baba8, S.K. Badyal8, A. Baldine6, L. Barabach6, C. Barlag9, S. Bathe9, B. Batiounia6, T. Bernier10, K.B. Bhalla2, V.S. Bhatia1, C. Blume9, E.-M. Bohne9, Z.K. Böröcz9, D. Bucher9, A. Buijs11, H. Büsching9, L. Carlen12, V. Chalyshev6, S. Chattopadhyay3, R. Cherbatchev5, T. Chujo13, A. Claussen9, A.C. Das3, M.P. Decowski14, H. Delagrange10, V. Djordjadze6, P. Donni4, I. Doubovik5, S. Dutt8, M.R. Dutta Majumdar3, K. El Chenawi12, S. Eliseev15, K. Enosawa13, P. Foka4, S. Fokin5, V. Frolov6, M.S. Ganti3, S. Garpman12, O. Gavrishchuk6, F.J.M. Geurts11, T.K. Ghosh16, R. Glasow9, S. K.Gupta2, B. Guskov6, H. Å.Gustafsson12, H. H.Gutbrod10, R. Higuchi13, I. Hrivnacova15, M. Ippolitov5, H. Kalechofsky4, R. Kamermans11, K.-H. Kampert9, K. Karadjev5, K. Karpio17, S. Kato13, S. Kees9, H. Kim7, B. W. Kolb18, I. Kosarev6, I. Koutcheryaev5, T. Krümpel9, A. Kugler15, P. Kulinich14, M. Kurata13, K. Kurita13, N. Kuzmin6, I. Langbein18, A. Lebedev5, Y.Y. Lee18, H. Löhner16, L. Luquin10, D.P. Mahapatra19, V. Manko5, M. Martin4, G. Martínez10, A. Maximov6, R. Mehdiyev6, G. Mgebrichvili5, Y. Miake13, D. Mikhalev6, Md.F. Mir8, G.C. Mishra19, Y. Miyamoto13, B. Mohanty19, M. J. Mora10, D. Morrison20, D. S. Mukhopadhyay3, V. Myalkovski6, H. Naef4, B. K. Nandi19, S. K. Nayak10, T. K. Nayak3, S. Neumaier18, A. Nianine5, V. Nikitine6, S. Nikolaev6, P. Nilsson12, S. Nishimura13, P. Nomokonov6, J. Nystrand12, F.E. Obenshain20, A. Oskarsson12, I. Otterlund12, M. Pachr15, A. Parfenov6, S. Pavliouk6, T. Peitzmann9, V. Petracek15, F. Plasil7, W. Pinganaud10, M.L. Purschke18, B. Raeven11, J. Rak15, R. Raniwala2, S. Raniwala2, V.S. Ramamurthy19, N.K. Rao8, F. Retiere10, K. Reygers9, G. Roland14, L. Rosselet4, I. Roufanov6, C. Roy10, J.M. Rubio4, H. Sako13, S.S. Sambyal8, R. Santo9, S. Sato13, H. Schlagheck9, H.-R. Schmidt18, Y. Schutz10, G. Shabratova6, T.H. Shah8, I. Sibiriak5, T. Siemiarczuk17, D. Silvermyr12, B.C. Sinha3, N. Slavine6, K. Söderström12, N. Solomey4, S.P. Sørensen7, 20, P. Stankus7, G. Stefanek17, P. Steinberg14, E. Stenlund12, D. Stüken9, M. Sumbera15, T. Svensson12, M.D. Trivedi3, A. Tsvetkov5, L. Tykarski17, J. Urbahn18, E.C.v.d. Pijll11, N.v. Eijndhoven11, G.J.v. Nieuwenhuizen14, A. Vinogradov5, Y.P. Viyogi3, A. Vodopianov6, S. Vörös4, B. Wyslouch14, K. Yagi13, Y. Yokota13 and G.R. Young7
1 University of Panjab, Chandigarh 160014, India
2 University of Rajasthan, Jaipur 302004, Rajasthan, India
3 Variable Energy Cyclotron Centre, Calcutta 700 064, India
4 University of Geneva, 1211 Geneva 4, Switzerland
5 RRC "Kurchatov Institute", 123182 Moscow, Russia
6 Joint Institute for Nuclear Research, 141980 Dubna, Russia
7 Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, USA
8 University of Jammu, Jammu 180001, India
9 University of Münster, 48149 Münster, Germany
10 SUBATECH, Ecole des Mines, Nantes, France
11 Universiteit Utrecht/NIKHEF, 3508 TA Utrecht, The Netherlands
12 Lund University, 221 00 Lund, Sweden
13 University of Tsukuba, Ibaraki 305, Japan
14 MIT Cambridge, MA 02139, USA
15 Nuclear Physics Institute, 250 68 Rez, Czech Rep.
16 KVI, University of Groningen, 9747 AA Groningen, The Netherlands
17 Institute for Nuclear Studies, 00-681 Warsaw, Poland
18 Gesellschaft für Schwerionenforschung (GSI), 64220 Darmstadt, Germany
19 Institute of Physics, 751-005 Bhubaneswar, India
20 University of Tennessee, Knoxville, TN 37966, USA
(Received: 8 August 2000 / Revised version: 5 December 2000 / Published online: 5 February 2001 -© Springer-Verlag 2001)
Abstract
Transverse energy, charged particle pseudorapidity
distributions and photon transverse momentum spectra have been
studied as a function of the number of participants (Npart) and
the number of binary nucleon-nucleon collisions (Ncoll) in
158 GeV Pb+Pb collisions over a wide impact parameter
range. A scaling of the transverse energy pseudorapidity density at
midrapidity as
and
is observed. For the charged particle
pseudorapidity density at midrapidity we find a scaling as
and
. This
faster than linear scaling with Npart indicates a violation of
the naive Wounded Nucleon Model.
© Società Italiana di Fisica, Springer-Verlag 2001