Systematics of inclusive photon production in 158 • A GeVPb induced reactions on Ni, Nb, and Pb targets

被引：30

作者：

Aggarwal, MM ^{[1
]}

Agnihotri, A

Ahammed, Z

Angelis, ALS

Antonenko, V

Arefiev, V

Astakhov, V

Avdeitchikov, V

Awes, TC

Baba, PVKS

Badyal, SK

Baldine, A

Barabach, L

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

Djordjadze, V

Donni, P

Doubovik, I

Dutt, S

Majumdar, MRD

El Chenawi, K

Eliseev, S

Enosawa, K

Foka, P

Fokin, S

Frolov, V

Ganti, MS

Garpman, S

Gavrishchuk, O

Geurts, FJM

Ghosh, TK

机构：

[1] Panjab Univ, Chandigarh 160014, India

[2] Univ Rajasthan, Jaipur 302004, Rajasthan, India

[3] Ctr Variable Energy Cyclotron, Calcutta 700064, W Bengal, India

[4] Univ Geneva, CH-1211 Geneva 4, Switzerland

[5] Kurchatov Inst, RRC, RU-123182 Moscow, Russia

[6] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[7] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[8] Univ Jammu, Jammu 180001, India

[9] Univ Munster, D-48149 Munster, Germany

[10] Ecole Mines, SUBATECH, Nantes, France

[11] Gesell Schwerionenforsch GmbH, D-64220 Darmstadt, Germany

[12] Univ Utrecht, NIKHEF, NL-3508 TA Utrecht, Netherlands

[13] Univ Lund, SE-22100 Lund, Sweden

[14] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan

[15] Inst Nucl Phys, CZ-25068 Rez, Czech Republic

[16] Univ Groningen, KVI, NL-9747 AA Groningen, Netherlands

[17] Inst Nucl Studies, PL-00681 Warsaw, Poland

[18] MIT, Cambridge, MA 02139 USA

[19] Inst Phys, Bhubaneswar 751005, Orissa, India

[20] Univ Tennessee, Knoxville, TN 37966 USA

来源：

PHYSICS LETTERS B | 1999年 / 458卷 / 2-3期

基金：

日本学术振兴会;

关键词：

D O I：

10.1016/S0370-2693(99)00560-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The multiplicity of inclusive photons has been measured on an event-by-event basis for 158.A GeV Pb induced reactions on Ni, Nb, and Pb targets. The systematics of the pseudorapidity densities at midrapidity (rho(max)) and the width of the pseudorapidity distributions have been studied for varying centralities for these collisions. A power law fit to the photon yield as a function of the number of participating nucleons gives a value of 1.12 +/- 0.03 for the exponent. The mean transverse momentum, [p(T)], of photons determined from the ratio of the measured electromagnetic transverse energy and photon multiplicity, remains almost constant with increasing rho(max). Results are compared with model predictions. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：422 / 430

页数：9

共 37 条

[21] STUDIES OF THE HYDRODYNAMIC EVOLUTION OF MATTER PRODUCED IN FLUCTUATIONS IN PBARP COLLISIONS AND IN ULTRARELATIVISTIC NUCLEAR COLLISIONS .2. TRANSVERSE-MOMENTUM DISTRIBUTIONS [J].