Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at 
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 GeV

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Al-Bataineh, H.; Alexander, J.; Alfred, M.; Al-Ta’ani, H.; 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.; Bandara, N. S.; Bannier, B.; Barish, K. N.; Bassalleck, B.; Basye, A.; Bathe, S.; Baublis, V.; Baumann, C.; Baumgart, Stephen; Bazilevsky, A.; Beaumier, M.; Beckman, S.; Беликов, С.; Belmont, R.; Bennett, R.; Berdnikov, A.; Berdnikov, Y.; Bickley, A. A.; Blau, D.; Bok, Jeongsu; Boyle, K.; Brooks, M. L.; Bryslawskyj, J.; Buesching, H.; Bumazhnov, V.; Bunce, G.; Butsyk, S.; Camacho, C. Muñoz; Campbell, S.; Castera, P.; Chen, C.-H.; Y., C.; Chiu, M.; Choi, I. J.; Choi, J.; Choi, S.; Choudhury, R. K.; Christiansen, P.; Chujo, T.; Chung, P.; Chvála, O.; Cianciolo, V.; Citron, Z. 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D.; Öskarsson, A.; Ouchida, M.; Ozawa, K.; Pak, R.; Pantuev, V.; Papavassiliou, V.; Park, B. H.; Park, I. H.; Park, J.; Park, J. S.; Park, S.; Park, S. K.; Park, W. J.; Pate, S. F.; Patel, L.; Patel, M.; Pei, H.; Peng, J. C.; Pereira, H.; Perepelitsa, D. V.; Perera, G. D. N.; Peresedov, V.; Peressounko, D. Yu.; Perry, J.; Petti, R.; Pinkenburg, C.; Pinson, R.; Pisani, R. P.; Proissl, M.; Purschke, M. L.; Purwar, A. K.; Qu, H.; Rak, J.; Rakotozafindrabe, A.; Ramson, B.; Ravinovich, I.; Read, K. F.; Reygers, K.; Reynolds, D.; Riabov, V.; Riabov, Y.; Richardson, E.; Rinn, Timothy Thomas; Roach, D.; Roche, G.; Rolnick, S. D.; Rosati, M.; Rosen, C. A.; Rosendahl, S. S.E.; Rosnet, P.; Rowan, Z.; Rubin, J.; Rukoyatkin, P.; Růžička, P.; Sahlmueller, B.; Saito, N.; Sakaguchi, T.; Sakashita, K.; Sako, H.; Samsonov, V.; Sano, M.; Сано, С.; Sarsour, M.; Sato, Susumu; Sato, T.; Sawada, S.; Schaefer, B.; Schmoll, B. K.; Sedgwick, K.; Seele, J.; Seidl, R.; Semenov, A.; Sen, A.; Seto, R.; Sett, P.; Sexton, A.; Sharma, D.; Shein, I.; Shibata, T. A.; Shigaki, K.; Shimomura, M.; Shoji, K.; Shukla, P.; Sickles, A. M.; Silva, C. L.; Silvermyr, D.; Silvestre, C.; Sim, K. S.; Singh, B. K.; Singh, C. P.; Singh, V. K.; Slunečka, M.; Snowball, M.; Soltz, R. A.; Sondheim, W. E.; Sørensen, S. P.; Sourikova, I. V.; Sparks, N. A.; Stankus, P. W.; Stenlund, E.; Stepanov, M.; Ster, A.; Stoll, S. P.; Sugitate, T.; Sukhanov, A.; Sumita, T.; Sun, J.; Sziklai, J.; Takagui, E. M.; Takahara, A.; Taketani, A.; Tanabe, R.; Tanaka, Y.; Taneja, S.; Tanida, K.; Tannenbaum, M. J.; Tarafdar, S.; Taranenko, A.; Tarján, P.; Tennant, E.; Themann, H.; Thomas, T. L.; Tieulent, R.; Timilsina, A.; Todoroki, T.; Togawa, M.; Toia, A.; Tomášek, L.; Tomášek, M.; Torii, H.; Towell, C. L.; 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.; White, A.; White, S. N.; Winter, D.; Wolin, S.; Wood, J.; Woody, C. L.; Wright, R. M.; Wysocki, M.; Xia, B.; Xie, W.; Xue, L.; Yalcin, S.; Yamaguchi, Yoshio; Yamaura, K.; Yang, R.; Yanovich, A.; Ying, J.; Yokkaichi, S.; Yoo, J.; Yoon, I.; Zhou, You; Young, G. R.; Younus, I.; Yu, H.; Yushmanov, I. E.; Zajc, W. A.; Zelenski, A.; Zhang, C.; Zhou, S.; Zolin, L.; Zou, L.

doi:10.1103/physrevc.94.064901

Cited by 108 publications

(68 citation statements)

References 49 publications

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“…However, simultaneous quantitative description of photon yield and flow coefficients has been challenging [6]. Current levels of uncertainty in experimental data of real photons at RHIC [62][63][64] and LHC [65] also limits the extent of reliable interpretations of theoretical predictions.…”

Section: Introductionmentioning

confidence: 99%

Dilepton production and elliptic flow from an anisotropic quark-gluon plasma

Kasmaei

Strickland

2019

Phys. Rev. D

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The emission of real photons from a momentum-anisotropic quark-gluon plasma (QGP) is affected by both the collective flow of the radiating medium and the modification of local rest frame emission rate due to the anisotropic momentum distribution of partonic degrees of freedom. In this paper, we first calculate the photon production rate from an ellipsoidally momentum-anisotropic QGP including hard contributions from Compton scattering and quark pair annihilation and soft contribution calculated using the hard thermal loop (HTL) approximation. We introduce a parametrization of the nonequilibrium rate in order to facilitate its further application in yield and flow calculations. We convolve the anisotropic photon rate with the space-time evolution of QGP provided by 3+1d anisotropic hydrodynamics (aHydro) to obtain the yield and the elliptic flow coefficient v 2 of photons from QGP generated at Pb-Pb collisions at LHC at 2.76 TeV and Au-Au collisions at RHIC at 200 GeV. We investigate the effects of various parameters on the results. In particular we analyze the sensitivity of results to initial momentum anisotropy.

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Section: Introductionmentioning

confidence: 99%

Dilepton production and elliptic flow from an anisotropic quark-gluon plasma

Kasmaei

Strickland

2019

Phys. Rev. D

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“…The calculation for v dir 2 agrees with the data in the low p T region, but underestimates the yield in the entire p T range. The data are also compared with a semi-QGP and the PHSD models in [2]. None of those can describe both the large yield and large v 2 simultaneously to an adequate level.…”

Section: Resultsmentioning

confidence: 99%

Direct Photon Production and Azimuthal Anisotropy at Low Transverse Momentum measured in PHENIX

Fan¹

2017

Nuclear and Particle Physics Proceedings

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The PHENIX experiment discovered a large excess of low-pT direct photons in Au+Au collisions at 200 GeV compared to reference p+p collisions, which has been attributed to thermal radiation from the medium produced in the collisions. At the same time the excess photons show a large azimuthal anisotropy, expressed as Fourier coefficients v2 and v3. These surprising results have not yet been fully described by theoretical models. We will present the results obtained from real photons in the electromagnetic calorimeter and photons converted on the outer shell of the Hadron Blind Detector. PHENIX has also developed a new technique to identify conversion photons without assuming the radius where the conversion happened. This method greatly increases the available statistics and reduces systematic uncertainties.

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“…This implies that the direct photon v n must be similar as well, independent of R γ , as long as R γ is significantly above unity (see Equation 1 in Section 2). Figure 3 shows the PHENIX Preliminary v 2 (top) and v 3 (bottom) of direct photons in Au+Au collisions at 200 GeV for different centrality classes [5]. Results from the external conversion and calorimeter method are compared.…”

Section: Azimuthal Anisotropymentioning

confidence: 99%

“…The event plane was determined with the reaction plane detector covering pseudorapidity 1 < |η| < 2.8. Details of this measurement can be found in an upcoming publication [5].…”

Section: Azimuthal Anisotropymentioning

confidence: 99%