Limits on the Production of Direct Photons in 200AGeVS 32 + A u Collisions
Author(s) -
R. Albrecht,
V. Antonenko,
T. C. Awes,
C. Barlag,
F. Berger,
M. A. Bloomer,
C. Blume,
David C. Bock,
R. Bock,
E.-M. Bohne,
D. Bucher,
G. Claesson,
A. Claussen,
G. Clewing,
R. Debbe,
L. Dragon,
Yu. Dubovik,
Anders Eklund,
S. Fokin,
A. Franz,
S. Garpman,
R. Glasow,
H.-Å. Gustafsson,
H.H. Gutbrod,
O. Hansen,
G. Hölker,
J. Idh,
M. Ippolitov,
P. Jacobs,
K.H. Kampert,
K. Karadjev,
B. W. Kolb,
A. Lebedev,
H. Löhner,
I. Lund,
V. Manko,
B. Moskowitz,
S. Nikolaev,
J. Nystrand,
F.E. Obenshain,
A. Oskarsson,
I. Otterlund,
T. Peitzmann,
F. Plasil,
A. M. Poskanzer,
M. L. Purschke,
H. G. Ritter,
B. Roters,
S. Saini,
R. Santo,
H. Schlagheck,
H. R. Schmidt,
K. Söderström,
S. P. Sørensen,
P. W. Stankus,
K. Steffens,
P. Steinhaeuser,
E. Stenlund,
D. Stüken,
А. Виноградов,
H. E. Wegner,
G. R. Young
Publication year - 1996
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.76.3506
Subject(s) - physics , production (economics) , photon , energy (signal processing) , yield (engineering) , sigma , particle physics , atomic physics , nuclear physics , quantum mechanics , economics , macroeconomics , thermodynamics
A search for the production of direct photons in S + An collisions at 200A GeV has been carried out in the CERN-WA80 experiment. For central collisions the measured photon excess at each pr, averaged over the range 0.5 less than or equal to p(T) less than or equal to less than or equal to 2.5 GeV/c, corresponded to 5.0% of the total inclusive photon yield with a statistical error of sigma(stat) = 0.8% and a systematic error of sigma(syst) = 5.8%. Upper limits on the invariant yield for direct photon production at the 90% C.L. are presented. Possible implications for the dynamics of high-energy heavy-ion collisions are discussed.
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