Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV
A. Adare, S. S. Adler, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y., Akiba, H. Al-Bataineh, A. Al-Jamel, J. Alexander, A. Angerami, K. Aoki, N., Apadula, L. Aphecetche, Y. Aramaki, R. Armendariz, S. H. Aronson, J. Asai, E., T. Atomssa, R. Averbeck, T. C. Awes, B. Azmoun
TL;DR
This study measures direct photon production in d+Au collisions at 200 GeV, finding results consistent with cold nuclear matter effects and suggesting that photon enhancement in Au+Au collisions arises from other sources.
Contribution
First measurement of direct photons in d+Au collisions at 200 GeV covering a wide p_T range, providing insights into initial-state effects and baseline for heavy-ion collisions.
Findings
Invariant yield consistent with unity over scaled p+p cross section
Standard cold nuclear matter effects describe the data well
Large photon enhancement in Au+Au is not due to initial-state effects
Abstract
Direct photons have been measured in sqrt(s_NN)=200 GeV d+Au collisions at midrapidity. A wide p_T range is covered by measurements of nearly-real virtual photons (1<p_T<6 GeV/c) and real photons (5<p_T<16 GeV/c). The invariant yield of the direct photons in d+Au collisions over the scaled p+p cross section is consistent with unity. Theoretical calculations assuming standard cold nuclear matter effects describe the data well for the entire p_T range. This indicates that the large enhancement of direct photons observed in Au+Au collisions for 1.0<p_T<2.5 GeV/c is due to a source other than the initial-state nuclear effects.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.