Centrality dependence of low-momentum direct-photon production in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Al-Bataineh, H.; Al-Ta’ani, H.; Alexander, J.; Angerami, A.; Aoki, Kazuo; Apadula, N.; Aramaki, Y.; Asano, H.; Aschenauer, E. C.; Atomssa, E. T.; Averbeck, R.; Awes, T. C.; Azmoun, B.; Babintsev, V.; Bai, Mei; Baksay, G.; Baksay, L.; Bannier, B.; Barish, K. N.; Bassalleck, B.; Basye, A.; Bathe, S.; Baublis, V.; Baumann, C.; Baumgart, Stephen; Bazilevsky, A.; Беликов, С.; Belmont, R.; Bennett, R.; Berdnikov, A.; Berdnikov, Y.; Bickley, A. A.; Bing, X.; Blau, D.; Bok, Jeongsu; Boyle, K.; Brooks, M. L.; Buesching, H.; Bumazhnov, V.; Bunce, G.; Butsyk, S.; Camacho, C. Muñoz; Campbell, S.; Castera, P.; Chen, C. -H.; Chi, C.Y.; Chiu, M.; Choi, I. J.; Choi, J.; Choi, S.; Choudhury, R. K.; Christiansen, P.; Chujo, T.; Chung, P.; Chvála, O.; Cianciolo, V.; Citron, Z. H.; Cole, B.; Connors, M.; Constantin, P.; Csanád, M.; Csörgő, T.; Dahms, T.; Dairaku, S.; Danchev, I.; Das, K.; Datta, A.; Daugherity, M.; David, G.; Denisov, A.; Deshpande, A.; Desmond, E. J.; Dharmawardane, K. V.; Dietzsch, O.; Ding, L.; Dion, A.; Donadelli, M.; Drapier, O.; Drees, A.; Drees, K. A.; Durham, J. M.; Durum, A.; Dutta, D.; d’Orazio, Laurent; Edwards, S.; Efremenko, Y. V.; Ellinghaus, F.; Engelmore, T.; Enokizono, A.; En’yo, H.; Esumi, S.; Eyser, K. O.; Fadem, B.; Fields, D. E.; Finger, M.; Finger, Jr.; Fleuret, F.; Fokin, S.; Fraenkel, Z.; Frantz, J. E.; Franz, A.; Frawley, A. D.; Fujiwara, K.; Fukao, Y.; Fusayasu, T.; Gainey, K.; Gal, C.; Garishvili, A.; Garishvili, I.; Glenn, A.; Gong, H.; Gong, X.; Gonin, M.; Goto, Y.; Cassagnac, R. Granier de; Grau, N.; Greene, S.; Perdekamp, M. Grosse; Gunji, T.; Guo, L.; Gustafsson, H.-Å.; Hachiya, T.; Haggerty, J. S.; Hahn, K. I.; Hamagaki, H.; Hamblen, J.; Han, R.; Hanks, J.; Hartouni, E. P.; Hashimoto, K.; Haslum, E.; Hayano, R.; He, X. Q.; Heffner, M.; Hemmick, T. K.; Hester, T.; Hill, J. C.; Hohlmann, M.; Hollis, R. S.; Holzmann, W.; Homma, K.; Hong, B.; Horaguchi, T.; Hori, Y.; Hornback, D.; Huang, S.; Ichihara, T.; Ichimiya, R.; Ide, J.; Iinuma, H.; Ikeda, Y.; Imai, K.; Imrek, J.; Inaba, M.; Iordanova, A.; Isenhower, D.; Ishihara, M.; Isobe, T.; Issah, M.; Isupov, A.; Ivanischev, D.; Ivanishchev, D.; Jacak, B.; Javani, M.; Jia, J.; Jiang, Xian Quan; Jin, J.; Johnson, B. M.; Joo, K. S.; Jouan, D.; Jumper, D. S.; Kajihara, F.; Kametani, S.; Kamihara, N.; Kamin, J.; Kaneti, S.; Kang, B. H.; Kang, J. H.; Kang, J. S.; Kapustinsky, J.; Karatsu, K.; Kasai, M.; Kawall, D.; Kawashima, M.; Kazantsev, A. V.; Kempel, T.; Khanzadeev, A.; Kijima, K. M.; I., Kim, B.; Kim, C.; Kim, D. H.; Kim, D. J.; Kim, E.; Kim, E. -J.; Kim, H. J.; Kim, K. -B.; Kim, S. H.; Kim, Y. -J.; Kim, Y. K.; Kinney, E.; Kiriluk, K.; Kiss, Á.; Kistenev, E.; Klatsky, J.; Kleinjan, D.; Kline, P.; Kochenda, L.; Komatsu, Yusuke; Komkov, B.; Konno, M.; Koster, J.; Kotchetkov, D.; Kotov, D.; Kozlov, A.; Král, A.; Kravitz, A.; Křížek, F.; Kunde, G. J.; Kurita, K.; Kurosawa, M.; Kwon, Y.; Kyle, G. S.; Lacey, R.; Lai, Yue Shi; Lajoie, J. G.; Lebedev, A.; Lee, B.; Lee, D. M.; Lee, J.; Lee, K.; Lee, K. B.; Lee, K. S.; Lee, S. H.; R., Lee, S.; Leitch, M. J.; Leite, M. A. L.; Leitgab, M.; Leitner, E.; Lenzi, B.; Lewis, B.; Li, X.; Liebing, P.; Lim, Sanghoon; Levy, L. A. Linden; Liška, T.; Litvinenko, A.; Liu, H.; Liu, M. X.; Love, B.; Luechtenborg, R.; Lynch, D.; Maguire, C.; Makdisi, Y. I.; Makek, M.; Malakhov, A.; Malik, M. D.; Manion, A.; Manko, V.; Mannel, E.; Mao, Y.; Masui, H.; Masumoto, S.; Matathias, F.; McCumber, M.; McGaughey, P. L.; McGlinchey, D.; McKinney, C.; Means, N.; Mendoza, M.; Meredith, B.; Miake, Y.; Mibe, T.; Mignerey, A. C.; Mikeš, P.; Miki, K.; Milov, A.; Mishra, D. 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J.; Tarafdar, S.; Taranenko, A.; Tarján, P.; Tennant, E.; Themann, H.; Thomas, T. L.; Todoroki, T.; Togawa, M.; Toia, A.; Tomášek, L.; Tomášek, M.; Torii, H.; Towell, R. S.; Tserruya, I.; Tsuchimoto, Y.; Tsuji, T.; Vale, C.; Valle, H.; Hecke, H. W. van; Vargyas, M.; Vazquez-Zambrano, E.; Veicht, A.; Velkovska, J.; Vértesi, R.; Виноградов, А.; Virius, M.; Vossen, A.; Vrba, V.; Vznuzdaev, E.; Wang, X. R.; Watanabe, Daisuke; Watanabe, K.; Watanabe, Y.; Wei, F.; Wei, R.; Wessels, J. P.; Whitaker, S.; White, S. N.; Winter, D.; Wolin, S.; Wood, J.; Woody, C. L.; Wright, R. M.; Wysocki, M.; Xie, W.; Yamaguchi, Y.; Yamaura, K.; Yang, R.; Yanovich, A.; Ying, J.; Yokkaichi, S.; Zhou, You; Young, G. R.; Younus, I.; Yushmanov, I. E.; Zajc, W. A.; Zelenski, A.; Zhang, C.; Zhou, S.; Zolin, L.

doi:10.48550/arxiv.1405.3940

Cited by 24 publications

(64 citation statements)

References 37 publications

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“…One of the outstanding puzzles in the phenomenology of the heavy-ion collisions is excess of photons at low transverse momenta above the photon spectrum in pp collisions scaled in proportion to the number of binary nucleon collisions [1]. Another related problem is large azimuthal asymmetry of the photon spectrum [2].…”

Section: Introductionmentioning

confidence: 99%

Role of magnetic field in photon excess in heavy ion collisions

Tuchin

2015

Phys. Rev. C

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Synchrotron photon spectrum in heavy-ion collisions is computed taking into account the spatial and temporal structure of magnetic field. It is found that a significant fraction of photon excess in heavy-ion collisions in the region k ⊥ = 1 − 3 GeV can be attributed to the synchrotron radiation. Azimuthal anisotropy of the synchrotron photon spectrum is characterized by the Fourier coefficients v2 = 4/7 and v4 = 1/10 that are independent of photon momentum and centrality.

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Section: Introductionmentioning

confidence: 99%

Role of magnetic field in photon excess in heavy ion collisions

Tuchin

2015

Phys. Rev. C

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“…Recently, results of low p ⊥ direct thermal photon spectrum at RHIC have been reported by PHENIX Collaboration [2,3]. The lowest p ⊥ bin in those results is 0.4 GeV ≤ p ⊥ ≤ 0.6 GeV .…”

Section: Introductionmentioning

confidence: 94%

Electrical conductivity of the quark-gluon plasma and soft photon spectrum in heavy-ion collisions

Yin

2014

Phys. Rev. C

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I extract the electrical conductivity σ 0 of the quark gluon plasma(QGP) and study the effects of magnetic field and chiral anomaly on soft photon azimuthal anisotropy, v 2 , based on the thermal photon spectrum at 0.4 GeV < p ⊥ < 0.6 GeV at RHIC energy. As a basis for my analysis, Iderive the behavior of retarded photon self energy of a strongly interacting neutral plasma in hydrodynamic regime in the presence of magnetic field and chiral anomaly. By evolving the resulting soft thermal photon production rate over the realistic hydrodynamic background and comparing the results with the data from the PHENIX Collaboration, I found that the electrical conductivity at QGP temperature is in the range: 0.4 < σ 0 /(e 2 T ) < 1.1, which is comparable with recent studies on lattice. I also compare the contribution from the magnetic field and chiral anomaly to soft thermal photon v 2 with the data. I argue that at LHC, the chiral magnetic wave would give negative contribution to photon v 2 . * yyin@bnl.gov

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“…Uncertainties on dN ch /dη are not included. All normalized data, p+p fit, pQCD curves are from [6], and they are obtained with Au+Au data from [10,11,12], Pb+Pb data from [13], p+p data at 200 GeV from [7], at 62.4 GeV from [14], at 63 GeV [15,16], the empirical fit to the p+p data at 200 GeV from [6], the pQCD calculations at different beam energies from [3,17], and the data on dN ch /dη from [8,9].…”

Section: Direct Photons Scalingmentioning

confidence: 99%

PHENIX measurements of low momentum direct photon radiation

Khachatryan

2018

Preprint

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The versatility of RHIC allowed the PHENIX collaboration to measure low momentum direct photons from small systems, such as p+p, p+A, d+Au at √ s NN =200 GeV as well as from large A+A systems, such as Au+Au and Cu+Cu at 200 GeV and Au+Au at 62.4 GeV and 39 GeV. In these measurements PHENIX has discovered a large excess over the scaled p+p yield of direct photons in A+A collisions, and a non-zero excess over the scaled p+p yield in central p+A collisions. Another PHENIX discovery is that at low-p T the integrated yield of direct photons, dN γ /dy, from large systems follows a universal scaling as a function of the charged-particle multiplicity, (dN ch /dη) α , with α = 1.25. The observed scaling properties of direct photons from these systems show that the photon production yield increases faster than the charged-particle multiplicity.

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Centrality dependence of low-momentum direct-photon production in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

Cited by 24 publications

References 37 publications

Role of magnetic field in photon excess in heavy ion collisions

Role of magnetic field in photon excess in heavy ion collisions

Electrical conductivity of the quark-gluon plasma and soft photon spectrum in heavy-ion collisions

PHENIX measurements of low momentum direct photon radiation

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