Search for direct photons from S - Au collisions at 200-GeV/u

The CERES collaboration Baur, R. ; Breskin, A. ; Chechik, R. ; et al.
Z.Phys.C 71 (1996) 571-578, 1996.
Inspire Record 398323 DOI 10.17182/hepdata.48133
1 data table

No description provided.

Enhanced production of low mass electron pairs in 200-GeV/u S - Au collisions at the CERN SPS

The CERES collaboration Agakichiev, G. ; Baur, R. ; Breskin, A. ; et al.
Phys.Rev.Lett. 75 (1995) 1272-1275, 1995.
Inspire Record 393957 DOI 10.17182/hepdata.47988

We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, the low-mass spectra are, within the systematic errors, satisfactorily explained by electron pairs from hadron decays, whereas in the S-Au system an enhancement over the hadronic contributions by a factor of 5.0±0.7(stat)±2.0(syst) in the invariant mass range 0.2<m<1.5GeV/c2 is observed. The properties of the excess suggest that it arises from two-pion annihilation ππ→e+e−.

2 data tables


No description provided.