Abstract
The CERES experiment has measured inclusive photon production in S-Au collisions of 200 GeV/nucleon at the CERN SPS. No evidence for direct emission of photons was found. For the kinematic region 2.1<y<2.65 and 0.4 GeV/c<p⊥<2.0 GeV/c the yield andp⊥-dependence of the observed photons are well reproduced by hadron decays. Furthermore, their production rate is found to be proportional to the charged particle density. The systematic errors comparing the measured and expected photon yield result in an upper limit of 14% for the emission of direct photons in central S-Au collisions. For a photon source with a yield depending quadratically on the charged particle density the limit can be reduced to 7%.
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References
M. Neubert, Z. Phys. C 42 (1989) 231;
J. Kapusta et al., Phys. Rev. D 44 (1991) 2774;
P.V. Ruuskanen, Nucl. Phys. A544 (1992) 169c;
R. Baier et al., Z. Phys. C 53 (1992) 433;
J. Kapusta, Nucl. Phys. A566 (1994) 45c
E.V. Shuryak and L. Xiong Phys. Lett. B333 (1994) 316
T. Åkesson et al., Z. Phys. C 46 (1990) 369
R. Albrecht et al., Z. Phys. C 51 (1991) 1
V. Cerny, P. Lichard and J. Pisut Z. Phys. C 31 (1986) 163;
K. Kajantie et al., Phys. Rev. D34 (1986) 2746
CERES/NA45-Collaboration, Proposal to the CERN SPSC 88-25, SPSC/P237
R. Baur et al., Nucl. Instr. and Meth. A343 (1994) 87
R. Baur et al., Nucl. Instr. and Meth. A343 (1994) 231;
R. Baur et al., Nucl. Instr. and Meth. A355 (1995) 329
T. F. Günzel et al., Nucl. Inst. Meth. A316 (1992) 259
W. Chen et al., IEEE Trans. Nucl. Sci. 39 (1992) 619
CERN Program Library W5013
T. Åkesson et al., Nucl. Phys. B353 (1991) 1
R. Albrecht et al., Z. Phys. C 55 (1992) 539
T. Åkesson et al., Z. Phys. C 46 (1990) 361
D. Röhrich et al., Nucl. Phys. A566 (1994) 35c
R. Santo et al., Nucl. Phys. A566 (1994) 61c
A. Drees et al., Nucl. Phys. A566 (1994) 87c;
A. Schön, Doctoral thesis, Universität Heidelberg 1993, unpublished
M. Aguilar-Benitez et al., Z. Phys. C 50 (1991) 405
Review of Particle Properties, Phys. Rev. D 45 (1992) Part 2
M. Bourquin, J.M. Gaillard, Nucl. Phys. B114 (1976) 334
R. Albrecht et al., Phys. Lett. B 361 (1995) 47
F. Büsser et al., Phys. Lett. B 55 (1975) 232;
J. Donaldson et al., Phys. Rev.Lett. 40 (1978) 684;
C. Kourkoumelis et al., Phys. Lett. B 84 (1979) 277;
J. Povlis et al., Phys. Rev.Lett. 51 (1983) 967;
M. Banner et al., Z. Phys. C 27 (1985) 329;
J. Antille et al., Phys. Lett. B 194 (1987) 568;
M. Bonesini et al., Z. Phys. C 42 (1989) 527
T.C. Awes et al., Nucl. Phys. A590 (95) 81c;
R. Albrecht et al., in preparation
G. Agakichiev et al., Phys. Rev.Lett. 75 (1995) 1272;
J.P. Wurm et al., Nucl. Phys. A590 (95) 103c
M. Masera et al., Nucl. Phys. A590 (95) 93c
M. C. Abreu et al., Nucl. Phys. A566 (1994) 77c
I. Tserruya, Nucl. Phys. A590 (95) 127c
CERES/NA45-Collaboration, Proposal to the CERN SPSC 94-01, SPSC/P280
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Doctoral Thesis of D. Irmscher, Universität Heidelberg (1993)
visiting from JINR, Dubna, Russia
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CERES Collaboration., Baur, R., Breskin, A. et al. Search for direct photons from S-Au collisions at 200 GeV/nucleon. Z. Phys. C - Particles and Fields 71, 571–577 (1996). https://doi.org/10.1007/BF02907017
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DOI: https://doi.org/10.1007/BF02907017