Nonprompt direct-photon production in Au+Au collisions at sNN =200 GeV

PHENIX Collaboration

doi:10.1103/PhysRevC.109.044912

Nonprompt direct-photon production in Au+Au collisions at sNN =200 GeV

PHENIX Collaboration

Relativistic Nuclear Physics

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

Abstract

The measurement of the direct-photon spectrum from Au+Au collisions at sNN=200 GeV is presented by the PHENIX Collaboration using the external-photon-conversion technique for 0%-93% central collisions in a transverse-momentum (pT) range of 0.8-10 GeV/c. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for pT<6GeV/c. Nonprompt direct photons are measured by subtracting the prompt component, which is estimated as Ncoll-scaled direct photons from p+p collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8<pT<6.0GeV/c and suggest that the spectrum has an increasing inverse slope from ≈0.2 to 0.4 GeV/c with increasing pT, which indicates a possible sensitivity of the measurement to photons from earlier stages of the evolution of the collision. In addition, like the direct-photon production, the pT-integrated nonprompt direct-photon yields also follow a power-law scaling behavior as a function of collision-system size. The exponent, α, for the nonprompt component is found to be consistent with 1.1 with no apparent pT dependence.

Original language	English
Article number	044912
Journal	Physical Review C
Volume	109
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.109.044912
State	Published - Apr 2024

Funding

We thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We also thank J. F. Paquet for many fruitful discussions and sharing additional information. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy, the National Science Foundation, Abilene Christian University Research Council, Research Foundation of SUNY, and Dean of the College of Arts and Sciences, Vanderbilt University (USA); Ministry of Education, Culture, Sports, Science, and Technology and the Japan Society for the Promotion of Science (Japan); Natural Science Foundation of China (People's Republic of China); Croatian Science Foundation and Ministry of Science and Education (Croatia); Ministry of Education, Youth and Sports (Czech Republic); Centre National de la Recherche Scientifique, Commissariat \u00E0 l'\u00C9nergie Atomique, and Institut National de Physique Nucl\u00E9aire et de Physique des Particules (France); J. Bolyai Research Scholarship, EFOP, the New National Excellence Program (\u00DANKP), NKFIH, and OTKA (Hungary); Department of Atomic Energy and Department of Science and Technology (India); Israel Science Foundation (Israel); Basic Science Research and SRC(CENuM) Programs through NRF funded by the Ministry of Education and the Ministry of Science and ICT (Korea); Ministry of Education and Science, Russian Academy of Sciences, Federal Agency of Atomic Energy (Russia); VR and Wallenberg Foundation (Sweden); University of Zambia, the Government of the Republic of Zambia (Zambia); the U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union, the Hungarian American Enterprise Scholarship Fund, the US-Hungarian Fulbright Foundation, and the US-Israel Binational Science Foundation.

Funders	Funder number
Ministry of Education
Basic Science Research
Semiconductor Research Corporation
National Science Foundation
Institut National de Physique Nucléaire et de Physique des Particules
Ministry of Science, ICT and Future Planning
CRDF Global
Japan Society for the Promotion of Science
Government of the Republic of Zambia
University of Zambia
Ministry of Education and Science
Israel Science Foundation
Wallenberg Foundation
Russian Academy of Sciences
Haridus- ja Teadusministeerium
Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique
Abilene Christian University Research Council
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
College of Arts and Sciences, University of Oklahoma
United States-Israel Binational Science Foundation
U.S. Department of Energy
US-Hungarian Fulbright Foundation
CENuM
Department of Atomic Energy and Department of Science and Technology
Research Foundation of SUNY
Hungarian Scientific Research Fund
Hungarian-American Enterprise Scholarship Fund
Nuclear Physics
Ministerstvo Školství, Mládeže a Tělovýchovy
Federal Agency of Atomic Energy
National Retail Federation
Vetenskapsrådet
Hrvatska Zaklada za Znanost
Vanderbilt University
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China

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10.1103/PhysRevC.109.044912

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title = "Nonprompt direct-photon production in Au+Au collisions at sNN =200 GeV",

abstract = "The measurement of the direct-photon spectrum from Au+Au collisions at sNN=200 GeV is presented by the PHENIX Collaboration using the external-photon-conversion technique for 0%-93% central collisions in a transverse-momentum (pT) range of 0.8-10 GeV/c. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for pT<6GeV/c. Nonprompt direct photons are measured by subtracting the prompt component, which is estimated as Ncoll-scaled direct photons from p+p collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8",

author = "{PHENIX Collaboration} and Abdulameer, {N. J.} and U. Acharya and A. Adare and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and M. Alfred and N. Apadula and H. Asano and B. Azmoun and V. Babintsev and M. Bai and Bandara, {N. S.} and B. Bannier and Barish, {K. N.} and S. Bathe and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and L. Bichon and B. Blankenship and Blau, {D. S.} and Bok, {J. S.} and V. Borisov and K. Boyle and Brooks, {M. L.} and J. Bryslawskyj and V. Bumazhnov and S. Campbell and {Canoa Roman}, V. and Chen, {C. H.} and M. Chiu and Chi, {C. Y.} and Choi, {I. J.} and Choi, {J. B.} and T. Chujo and Z. Citron and M. Connors and R. Corliss and {Corrales Morales}, Y. and M. Csan{\'a}d and T. Cs{\"o}rgo and Danley, {T. W.} and A. Datta and Daugherity, {M. S.} and Lajoie, {J. G.} and Read, {K. F.}",

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AU - PHENIX Collaboration

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AU - Adare, A.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Alfred, M.

AU - Apadula, N.

AU - Asano, H.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bandara, N. S.

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AU - Barish, K. N.

AU - Bathe, S.

AU - Bazilevsky, A.

AU - Beaumier, M.

AU - Beckman, S.

AU - Belmont, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Bichon, L.

AU - Blankenship, B.

AU - Blau, D. S.

AU - Bok, J. S.

AU - Borisov, V.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Bryslawskyj, J.

AU - Bumazhnov, V.

AU - Campbell, S.

AU - Canoa Roman, V.

AU - Chen, C. H.

AU - Chiu, M.

AU - Chi, C. Y.

AU - Choi, I. J.

AU - Choi, J. B.

AU - Chujo, T.

AU - Citron, Z.

AU - Connors, M.

AU - Corliss, R.

AU - Corrales Morales, Y.

AU - Csanád, M.

AU - Csörgo, T.

AU - Danley, T. W.

AU - Datta, A.

AU - Daugherity, M. S.

AU - Lajoie, J. G.

AU - Read, K. F.

PY - 2024/4

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AB - The measurement of the direct-photon spectrum from Au+Au collisions at sNN=200 GeV is presented by the PHENIX Collaboration using the external-photon-conversion technique for 0%-93% central collisions in a transverse-momentum (pT) range of 0.8-10 GeV/c. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for pT<6GeV/c. Nonprompt direct photons are measured by subtracting the prompt component, which is estimated as Ncoll-scaled direct photons from p+p collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8

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DO - 10.1103/PhysRevC.109.044912

M3 - Article

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VL - 109

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044912

ER -

Nonprompt direct-photon production in Au+Au collisions at sNN =200 GeV

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