Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sNN=200 GeV

  title={Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sNN=200 GeV},
  author={Andrew Marshall Adare and Serguei Afanasiev and Christine A. Aidala and Nuggehalli N. Ajitanand and Yasuyuki Akiba and R. Akimoto and Hussein Al-Bataineh and H. Al-Ta’ani and James Alexander and Aaron Angerami and K. Aoki and N. Apadula and Yoki Aramaki and H. Asano and Elke C. Aschenauer and Ermias T. Atomssa and R. Averbeck and Terry C. Awes and B. Azmoun and V. V. Babintsev and M. Bai and Gyongyi Baksay and L{\'a}szl{\'o} Baksay and Benjamin Bannier and Kenneth N. Barish and Bernd Bassalleck and Austin Thomas Basye and Stefan Bathe and V. V. Baublis and C. Baumann and Stephen Baumgart and Alexander V. Bazilevsky and Sergey Belikov and Ronald John Belmont and R. Bennett and A. Ya. Berdnikov and Yaroslav A. Berdnikov and Abigail A. Bickley and Xiaojin Bing and D. Blau and J Bok and Kieran Boyle and Michael L. Brooks and H. Georg Buesching and Vladimir Bumazhnov and Gerry M. Bunce and Sergei V. Butsyk and Carlos Mu{\~n}oz Camacho and Sarah Campbell and Philippe Castera and C-H. Chen and C. Y. Chi and M. Chiu and I. J. Choi and J. B. Choi and S. Choi and Rajani Kant Choudhury and P. H. L. Christiansen and T. Chujo and P. Chung and Ondřej Chv{\'a}la and Vince Cianciolo and Zvi Hirsh Citron and Brian A. Cole and Megan Elizabeth Connors and Paul Constantin and M'at'e Csan'ad and Tam'as CsorgHo and Torsten Dahms and Sachiko Dairaku and I. C. Danchev and Kushal Das and Animesh Datta and Michael Daugherity and G. David and A. Denisov and Abhay Deshpande and Edmond Desmond and K. V. Dharmawardane and Ol{\'a}cio Dietzsch and L. Ding and Alan Dion and Marisilvia Donadelli and Olivier Drapier and Alexander Drees and Kirsten Drees and J. Matthew Durham and A. Durum and Deepanwita Dutta and Luca D'Orazio and Steve Edwards and Y. Efremenko and Frank Ellinghaus and Tatia Engelmore and Akitomo Enokizono and Hideto En’yo and Shin-ichi Esumi and Kjeld Oleg Eyser and Brett Fadem and D. Fields and Michael Finger and Jr. and François Fleuret and S. L. Fokin and Zeev Fraenkel and Janet Elizabeth Frantz and A. Franz and A. D. Frawley and K. Fujiwara and Yoshinori Fukao and Takahiro Fusayasu and K. Gainey and C. Gal and Archil Garishvili and Irakli Garishvili and Andrew Glenn and Haowei Gong and X. Gong and Michel Gonin and Y. Goto and Rapha{\"e}l Granier de Cassagnac and Nathan Grau and Senta Victoria Greene and M. Grosse Perdekamp and T. Gunji and L. Guo and Hilda Gustafsson and T. Hachiya and J. S. Haggerty and Kevin Insik Hahn and H. Hamagaki and Joshua Hamblen and R. Han and Jonathan Hanks and E. P. Hartouni and Keiko Hashimoto and Eva Haslum and Ryugo Hayano and X. He and Michelle Heffner and Thomas K. Hemmick and Torrie Hester and J. Colin Hill and Marcus Hohlmann and Richard S. Hollis and W. Holzmann and Kensuke Homma and B. Hong and Takuma Horaguchi and Yasuto Hori and Donald Eric Hornback and S. L. Huang and Takashi Ichihara and Ryoichi Ichimiya and J. Ide and H. Iinuma and Yu Ikeda and Kenichi Imai and Jozsef Imrek and M. Inaba and Aneta Iordanova and Donald Isenhower and Mamoru Ishihara and T. Isobe and Michael Issah and A. Isupov and D. Ivanischev and Dmitry Ivanishchev and Barbara Jacak and Mohammad Javani and Jiangyong Jia and X. S. Jiang and J. Jin and B. M. Johnson and K. S. Joo and Denis Jouan and Daniel Jumper and Fumie Kajihara and Shigeki Kametani and Noriya Kamihara and J Kamin and Steven Kaneti and B. H. Kang and J. H. Kang and J. Kang and J. S. Kapustinsky and Kenichi Karatsu and M. Kasai and D. Kawall and Masatoshi Kawashima and A. V. Kazantsev and Todd Kempel and Alexei Khanzadeev and Kotaro M. Kijima and B. Kim and C. Kim and D. H. Kim and D. J. Kim and E. J. Kim and E-J. Kim and H. J. Kim and K.‐B. Kim and S. H. Kim and Y.‐J. Kim and Y. K. Kim and E R Kinney and Kristin Kiriluk and 'A. Kiss and Edouard Kistenev and J. Klatsky and David William Kleinjan and Paul Kline and Leonid Kochenda and Yusuke Komatsu and B. G. Komkov and Masahiro Konno and Jeremy Koster and Dmitri Kotchetkov and Dmitry Kotov and Alex Kozlov and A. Kr'al and Ashley Kravitz and Filip Krizek and Gerd J. Kunde and Kentarou Kurita and M. Kurosawa and Y. K. Kwon and G. S. Kyle and Roy Lacey and Y. S. Lai and John G. Lajoie and Alexandre Lebedev and B. Lee and D. M. Lee and J. H. W. Lee and K. B. Lee and K. B. Lee and K. S. Lee and S. H. Lee and S. R. Lee and M. J. Leitch and M. A. L. Leite and Martin Leitgab and E. Leitner and Bruno Lenzi and Benji Lewis and X. Li and Patricia Liebing and S. H. Lim and L. A. Linden Levy and T. Livska and A. Litvinenko and H. Liu and M. Liu and B. Love and R. Luechtenborg and D. Lynch and Charles Maguire and Yousef I. Makdisi and Mihael Makek and Alexander I. Malakhov and Michael D. Malik and Andrew Manion and V. Manko and E. J. Mannel and Y. J. Mao and H. Masui and Shin’ichi Masumoto and Felix Matathias and Michael P. McCumber and Patrick McGaughey and Don Mcglinchey and Cameron McKinney and Nathan Means and M. Mendoza and B. D. Meredith and Yasuo. Miake and Tsutomu Mibe and Alice C. Mignerey and P. Mikevs and Kazushi Miki and Alexander Milov and Debadeepti Mishra and M. Mishra and J. T. Mitchell and Yoshiyuki Miyachi and Shou Miyasaka and Ajit Kumar Mohanty and H. J. Moon and Yoshiki Morino and Astrid Morreale and Dave Morrison and Steven Motschwiller and T. V. Moukhanova and T. Murakami and Jiro Murata and Tomofumi Nagae and Shoji Nagamiya and James Lawrence Nagle and Maxim Naglis and Marton Imre Nagy and I. Nakagawa and Yoshihide Nakamiya and K. Nakamura and T. Nakamura and Katsumaro Nakano and C. Nattrass and A. Nederlof and Julie Newby and Marguerite Nguyen and M. Nihashi and Rachid Nouicer and Norbert Novitzky and Alexander Nyanin and E. O’Brien and Susumu X. Oda and Craig A. Ogilvie and M. Oka and Kensuke Okada and Y. Onuki and Anders Nils Erik Oskarsson and Misaki Ouchida and K. Ozawa and R. Pak and Vladislav Pantuev and Vassilios G. Papavassiliou and B. H. Park and Il Han Park and J. Park and S. K. Park and W. J. Park and Stephen F. Pate and Laura Patel and Hua Pei and J. C. Peng and H. Pereira and V. F. Peresedov and D. Y.-U. Peressounko and Richard Petti and C. Pinkenburg and R. P. Pisani and Manuel Proissl and Martin L. Purschke and Anuj Kumar Purwar and H. Qu and Jan Rak and A. Rakotozafindrabe and Ilia Ravinovich and K. F. Read and K. Reygers and Damian Reynolds and Viktor Riabov and Yu. G. Riabov and Emily D. Richardson and Nowo Riveli and D. Roach and G. Roche and Sky Deva Rolnick and M. Rosati and Christopher Rosen and S. S. E. Rosendahl and Philippe Rosnet and Pavel A. Rukoyatkin and P. Ruvzivcka and Baldo Sahlmueller and Norihito Saito and Takeshi Sakaguchi and Kazuki Sakashita and Vladislav Samsonov and Masato Sano and S. Sano and M. Sarsour and T. Sato and S Sawada and Kenneth Sedgwick and Jens-Christian Seele and Ralf Seidl and A. Yu. Semenov and Abhisek Sen and Ryosuke Seto and D. Sharma and I R Shein and Toshi-aki Shibata and Kohtaro Shigaki and Maya Hachiya Shimomura and K. Shoji and P. Shukla and Anne Marie Sickles and C. L. Silva and D. Silvermyr and Catherine Micaela Silvestre and Kwang Souk Sim and Brajesh K. Singh and C. P. Singh and Vikram Singh and M. Slunevcka and Ron A. Soltz and Walter Sondheim and Soren Pontoppidan Sorensen and Mittal Soumya and Irina Sourikova and N. A. Sparks and P. W. Stankus and E. Stenlund and Michael Stepanov and Andr{\'a}s Ster and S. P. Stoll and Toru Sugitate and A. N. Sukhanov and J Sun and J{\'a}nos Sziklai and E. M. Takagui and Atsushi Takahara and Atsushi Taketani and R. Tanabe and Y. Tanaka and Shantam Taneja and Kiyoshi Tanida and Michael J. Tannenbaum and S. Tarafdar and Arkadij Taranenko and P. Tarj'an and E. Tennant and Hermann Themann and T. L. Thomas and Takahito Todoroki and Manabu Togawa and Alberica Toia and L. Tom'avsek and M. Tom'avsek and H. Torii and R. S. Towell and Itzhak Tserruya and Yuji Tsuchimoto and Tomoya Tsuji and C. Vale and H. Valle and H. W. van Hecke and Márton Vargyas and E. Vazquez-Zambrano and Aaron Veicht and Julia Velkovska and R'obert V'ertesi and A. A. Vinogradov and Miroslav Virius and A. Vossen and V{\'a}clav Vrba and E. A. Vznuzdaev and X. R. Wang and Daisuke Watanabe and K. Watanabe and Y. S. Watanabe and Y. S. Watanabe and Feng Wei and Rui Wei and J. P. Wessels and Scott Whitaker and S. White and David Winter and Scott Wolin and J. P. Wood and Craig Woody and R. M. Wright and Matthew Wysocki and Wei Xie and Yasuhiro Yamaguchi and K. Yamaura and R. Yang and A. A. Yanovich and J. Ying and Satoshi Yokkaichi and Z. You and Glenn R. Young and Imran Younus and I. E. Yushmanov and William A. Zajc and A. Zelenski and C Zhang and S. J. Zhou and L. S. Zolin},
  journal={Physical Review C},
The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at √sNN = 200 GeV down to p_ 
Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at sNN =200 GeV
The PHENIX experiment at the BNL Relativistic Heavy Ion Collider has measured second- and third-order Fourier coefficients of the azimuthal distributi
Measurement of Dielectron Invariant Mass Spectra in Au + Au Collisions at p sNN = 200GeV with HBD in PHENIX
Measurement of Dielectron Invariant Mass Spectra in Au+ Au Collisions at p sNN = 200GeV with HBD in PHENIX
Direct photon production at low transverse momentum in proton-proton collisions at s=2.76 and 8 TeV
Measurements of inclusive and direct photon production at midrapidity in pp collisions at s=2.76 and 8 TeV are presented by the ALICE experiment at the LHC. The results are reported in transverse
Synchrotron contribution to photon emission from a quark–gluon plasma
The influence of the magnetic field on the photon emission from the quark–gluon plasma created in AA collisions is studied. It is found that the effect of magnetic field is very small even for very
Direct Photon Measurements with the ALICE Experiment at the LHC
In high-energy hadron collisions, direct photons can be produced in various processes andare of particular interest to study the hot QCD medium since they escape it without being affected.These


Centrality dependence of the direct photon yield and elliptic flow in heavy-ion collisions at sqrt(s)=200 GeV
part with � � 1.5, whereas the partonic contribution scales with an exponent �p � 1.75. Additionally, we provide predictions for the centrality dependence of the direct photon elliptic flow v2(pT).
Observation of direct-photon collective flow in Au + Au collisions at √s(NN)] = 200 GeV.
In the p(T) < 4 GeV/c region dominated by thermal photons, a substantial direct-photon v(2) comparable to that of hadrons is found, whereas model calculations for thermal photons in this kinematic region underpredict the observed v( 2).
Towards azimuthal anisotropy of direct photons
Intensive radiation of magnetic bremsstrahlung type (synchrotron radiation) resulting from the interaction of escaping quarks with the collective confining color field is discussed as a new possible
A clear-cut test of low mass dilepton production mechanism in hadronic collisions
It is pointed out that the dependence of the mean number of low mass dileptons per event on the multiplicity of charged hadrons can disentangle various mechanisms contributing to the low mass
Measurement of direct photons in Au+Au collisions at √(s(NN))=200 GeV.
The direct photon nuclear modification factor R(AA) was calculated as a function of p(T) for different Au+Au collision centralities using the measured p+p direct photon spectrum and compared to theoretical predictions, and was found to be consistent with unity for all centralities over the entire measured p (T) range.
Probing the QCD equation of state with thermal photons in nucleus–nucleus collisions at RHIC
Thermal photon production at mid-rapidity in Au+Au reactions at $\sqrt{s_{NN}}=200 GeV$ is studied in the framework of a hydrodynamical model that describes efficiently the bulk identified hadron
Measurement of Direct-Photon Elliptic Flow in Pb-Pb Collisions at = 2.76 TeV
We present the first measurement of the direct-photon elliptic flow vγ,dir2 in Pb-Pb collisions at = 2.76 TeV with data taken by the ALICE experiment at the LHC. The measurement provides evidence for
Conformal anomaly as a source of soft photons in heavy ion collisions.
A novel photon production mechanism stemming from the conformal anomaly of QCD×QED and the existence of strong (electro)magnetic fields in heavy ion collisions is introduced and leads to the photon production yield that is comparable to the yield from conventional sources.