Direct virtual photon production in Au+Au collisions at sNN=200 GeV

STAR Collaboration

doi:10.1016/j.physletb.2017.04.050

Direct virtual photon production in Au+Au collisions at s_NN=200 GeV

STAR Collaboration

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

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/c² for 0–80% minimum-bias Au+Au collisions at 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.

Original language	English
Pages (from-to)	451-458
Number of pages	8
Journal	Physics Letters B
Volume	770
DOIs	https://doi.org/10.1016/j.physletb.2017.04.050
State	Published - Jul 10 2017
Externally published	Yes

Funding

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. DOE Office 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.

Funders	Funder number
KISTI Center in Korea
RHIC Operations Group
RosAtom of Russia
National Science Foundation	1613939
Office of Science
Nuclear Physics
National Research Foundation
Department of Science and Technology, Ministry of Science and Technology, India
University Grants Commission
Department of Atomic Energy, Government of India
National Natural Science Foundation of China
Ministerstvo Školství, Mládeže a Tělovýchovy
Ministry of Education of the People's Republic of China
Chinese Academy of Sciences
Ministarstvo Obrazovanja, Znanosti i Sporta
Ministry of Education and Science of the Russian Federation
National Research Foundation of Korea
Narodowe Centrum Nauki
Ministry of Science and Technology, Taiwan
National Cheng Kung University Hospital
Raincoast Conservation Foundation

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10.1016/j.physletb.2017.04.050

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@article{4a339da57c3b4a179e6d82aa3c086e8a,

title = "Direct virtual photon production in Au+Au collisions at sNN=200 GeV",

abstract = "We report the direct virtual photon invariant yields in the transverse momentum ranges 1T<3 GeV/c and 5T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10ee<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 1T<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.",

author = "{STAR Collaboration} and L. Adamczyk and Adkins, {J. K.} and G. Agakishiev and Aggarwal, {M. M.} and Z. Ahammed and Ajitanand, {N. N.} and I. Alekseev and Anderson, {D. M.} and R. Aoyama and A. Aparin and D. Arkhipkin and Aschenauer, {E. C.} and Ashraf, {M. U.} and A. Attri and Averichev, {G. S.} and X. Bai and V. Bairathi and A. Behera and R. Bellwied and A. Bhasin and Bhati, {A. K.} and P. Bhattarai and J. Bielcik and J. Bielcikova and Bland, {L. C.} and Bordyuzhin, {I. G.} and J. Bouchet and Brandenburg, {J. D.} and Brandin, {A. V.} and D. Brown and I. Bunzarov and J. Butterworth and H. Caines and {Calder{\'o}n de la Barca S{\'a}nchez}, M. and Campbell, {J. M.} and D. Cebra and I. Chakaberia and P. Chaloupka and Z. Chang and N. Chankova-Bunzarova and A. Chatterjee and S. Chattopadhyay and X. Chen and X. Chen and Chen, {J. H.} and J. Cheng and M. Cherney and W. Christie and G. Contin and J. Schambach",

note = "Publisher Copyright: {\textcopyright} 2017 The Author",

year = "2017",

month = jul,

day = "10",

doi = "10.1016/j.physletb.2017.04.050",

language = "English",

volume = "770",

pages = "451--458",

journal = "Physics Letters B",

issn = "0370-2693",

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TY - JOUR

T1 - Direct virtual photon production in Au+Au collisions at sNN=200 GeV

AU - STAR Collaboration

AU - Adamczyk, L.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Ajitanand, N. N.

AU - Alekseev, I.

AU - Anderson, D. M.

AU - Aoyama, R.

AU - Aparin, A.

AU - Arkhipkin, D.

AU - Aschenauer, E. C.

AU - Ashraf, M. U.

AU - Attri, A.

AU - Averichev, G. S.

AU - Bai, X.

AU - Bairathi, V.

AU - Behera, A.

AU - Bellwied, R.

AU - Bhasin, A.

AU - Bhati, A. K.

AU - Bhattarai, P.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Bland, L. C.

AU - Bordyuzhin, I. G.

AU - Bouchet, J.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Brown, D.

AU - Bunzarov, I.

AU - Butterworth, J.

AU - Caines, H.

AU - Calderón de la Barca Sánchez, M.

AU - Campbell, J. M.

AU - Cebra, D.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chang, Z.

AU - Chankova-Bunzarova, N.

AU - Chatterjee, A.

AU - Chattopadhyay, S.

AU - Chen, X.

AU - Chen, J. H.

AU - Cheng, J.

AU - Cherney, M.

AU - Christie, W.

AU - Contin, G.

AU - Schambach, J.

PY - 2017/7/10

Y1 - 2017/7/10

N2 - We report the direct virtual photon invariant yields in the transverse momentum ranges 1T<3 GeV/c and 5T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10ee<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 1T<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.

AB - We report the direct virtual photon invariant yields in the transverse momentum ranges 1T<3 GeV/c and 5T<10 GeV/c at mid-rapidity derived from the dielectron invariant mass continuum region 0.10ee<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 1T<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.

UR - http://www.scopus.com/inward/record.url?scp=85019187716&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.04.050

DO - 10.1016/j.physletb.2017.04.050

M3 - Article

AN - SCOPUS:85019187716

SN - 0370-2693

VL - 770

SP - 451

EP - 458

JO - Physics Letters B

JF - Physics Letters B

ER -

Direct virtual photon production in Au+Au collisions at s_NN=200 GeV

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