Observation of direct photons in central 158A GeV 208Pb+208Pb collisions

被引：180

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

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

Majumdar, MRD

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

机构：

[1] Panjab Univ, Chandigarh 160014, India

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

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

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

[5] RRC Kurchatov Inst, 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] GSI Darmstadt, 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 37996 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.85.3595

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A measurement of direct photon production in Pb-208 + Pb-208 collisions at 158A GeV has been carried out in the CERN WA98 experiment. The invariant yield of direct photons in central collisions is extracted as a function of transverse momentum in the interval 0.5 < p(T) < 4 GeV/c. A significant direct photon signal, compared to statistical and systematical errors, is seen at p(T) > 1.5 GeV/c. The result constitutes the first observation of direct photons in ultrarelativistic heavy-ion collisions. It could be significant for diagnosis;of quark-gluon-plasma formation.

引用

页码：3595 / 3599

页数：5

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