Abstract
We report the direct virtual photon invariant yields in the transverse momentum ranges 1 < pT < 3 GeV/c and 5 < pT < 10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10 < Mee < 0.28 GeV/c2 for 0–80% minimum-bias Au+Au collisions at √sNN = 200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function TAA scaled p + p reference is observed in the pT range 1 < pT < 3 GeV/c. For pT > 6 GeV/c the production follows TAA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.
Document Type
Article
Publication Date
7-10-2017
Digital Object Identifier (DOI)
https://doi.org/10.1016/j.physletb.2017.04.050
Funding Information
Funded by SCOAP3 - Sponsoring Consortium for Open Access Publishing in Particle Physics.
We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, the KISTI Center in Korea, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOEOffice of Science, the U.S. NSF, the Ministry of Education and Science of the Russian Federation, NSFC, CAS, MOST and MOE of China, the National Research Foundation of Korea, NCKU (Taiwan), GA and MSMT of the Czech Republic, FIAS of Germany, DAE, DST, and UGC of India, the National Science Centre of Poland, National Research Foundation, the Ministry of Science, Education and Sports of the Republic of Croatia, and RosAtom of Russia. We thank C. Gale, J. Paquet, R. Rapp, C. Shen, and H. van Hees for valuable discussions and for providing the theoretical calculations.
Repository Citation
Adamczyk, L.; Adkins, James K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Ajitanand, N. N.; Alekseev, I.; Anderson, D. M.; Aoyama, R.; Aparin, A.; Arkhipkin, D.; Aschenauer, E. C.; Ashraf, M. U.; Attri, A.; Averichev, G. S.; Bai, X.; Bairathi, V.; Behera, A.; Bellwied, R.; Bhasin, A.; Bhati, A. K.; Bhattarai, P.; Bielcik, J.; Bielcikova, J.; Bland, L. C.; Bordyuzhin, I. G.; Bouchet, J.; Brandenburg, J. D.; Brandin, A. V.; Brown, D.; Fatemi, Renee H.; and Ramachandran, Suvarna, "Direct Virtual Photon Production in Au+Au Collisions at √sNN = 200 GeV" (2017). Physics and Astronomy Faculty Publications. 504.
https://uknowledge.uky.edu/physastron_facpub/504
Notes/Citation Information
Published in Physics Letters B, v. 770, p. 451-458.
© 2017 The Author.
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Due to the large number of authors involved, only the first 30 and the ones affiliated with the University of Kentucky are listed in the author section above. The authors of this article are collectively known as STAR Collaboration. To see a full list of authors, please download this article or visit: https://doi.org/10.1016/j.physletb.2017.04.050