Coherent e+e- production at very low transverse momentum at STAR
Shanda Nanlu 27#, Shandong University, Jinan, Shandong Province, China 250100
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Published online: 2 February 2018
We report the measurements of e+e- pair production at very low e+e- pair transverse momentum (pT < 0.15 GeV/c) in Au+Au collisions at = 200 GeV and U+U collisions at = 193 GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 60-80% centrality, significant excesses are observed with respect to hadronic cocktails in both Au+Au and U+U collisions. These excess yields can not be explained by a theoretical model calculation incorporating in-medium broadened ρ spectral function. Additionally, the distribution for excess yield is shown and found to be exponential at very low pT.
© The Authors, published by EDP Sciences, 2018
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