Direct virtual photon production in Au plus Au collisions at root s(NN)=200 GeV STAR Collaboration

0477399 - ÚJF 2018 RIV NL eng J - Journal Article
Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Federičová, P. - Harlenderová, A. - Kocmánek, Martin - Kvapil, J. - Lidrych, J. - Rusňák, Jan - Rusňáková, O. - Šaur, Miroslav - Šimko, Miroslav - Šumbera, Michal - Trzeciak, B. A. … Total 349 authors
Direct virtual photon production in Au plus Au collisions at root s(NN)=200 GeV STAR Collaboration.
Physics Letters. B. Roč. 770, JUL (2017), s. 451-458. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT LG15001; GA MŠMT LM2015054
Institutional support: RVO:61389005
Keywords : STAR collaboration * transverse mementum * Au Au collisions
OECD category: Nuclear physics
Impact factor: 4.254, year: 2017

We report the direct virtual photon invariant yields in the transverse momentum ranges 1 < P-T < 3 GeV/c and 5 < p(T) < 10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10 < M-ee < 0.28 GeV/c(2) for 0-80% minimum-bias Au+Au collisions at root s(NN) = 200 GeV. A clear excess in the invariant yield compared to the nuclear overlap function T-AA scaled p + p reference is observed in the p(T) range 1 < P-T < 3 GeV/c. For P-T > 6 GeV/c the production follows T-AA scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.
Permanent Link: http://hdl.handle.net/11104/0273753