| Issue |
EPJ Web Conf.
Volume 171, 2018
17th International Conference on Strangeness in Quark Matter (SQM 2017)
|
|
|---|---|---|
| Article Number | 18016 | |
| Number of page(s) | 4 | |
| Section | Open and Hidden Heavy-Flavour (parallel session) | |
| DOI | https://doi.org/10.1051/epjconf/201817118016 | |
| Published online | 02 February 2018 | |
https://doi.org/10.1051/epjconf/201817118016
Coherent e+e- production at very low transverse momentum at STAR
Shanda Nanlu 27#, Shandong University, Jinan, Shandong Province, China 250100
* e-mail: chiyang@sdu.edu.cn
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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