Enhanced production of direct photons in Au + Au collisions at square root(S(NN)) = 200 GeV and implications for the initial temperature.

  title={Enhanced production of direct photons in Au + Au collisions at square root(S(NN)) = 200 GeV and implications for the initial temperature.},
  author={A. M. Adare and Sergei Afanasiev and Christine A. Aidala and N. N. Ajitanand and Yasuyuki Akiba and Hussein Al-Bataineh and James G. Alexander and A. Al-Jamel and Katsutoshi Aoki and L. Aphecetche and R. L. Armendariz and S. H. Aronson and Junpei Asai and Ermias Atomssa and Ralf Averbeck and Terry C. Awes and Babek Azmoun and Valentin P. Babintsev and G. Baksay and L{\'a}szl{\'o} Baksay and A. Baldisseri and Kenneth N Barish and Penelope D Barnes and B. Bassalleck and Stefan Bathe and S. Batsouli and V. V. Baublis and Florian Bauer and Alexander Bazilevsky and Stanislav Belikov and Richard A O Bennett and Yu S Berdnikov and Abigail Bickley and Michael T Bjorndal and J. G. Boissevain and H. Borel and Kieran Boyle and Michael L Brooks and David S. Brown and Denis Bucher and H. Georg Buesching and V. Bumazhnov and G. Bunce and J. M. Burward-Hoy and S. V. Butsyk and Scott R. Campbell and J. Chai and B. S. Chang and J. L. Charvet and S A Chernichenko and J. Chiba and C. Y. Chi and Mickey Chiu and I. J. Choi and Tatsuya Chujo and Peter Chee-Keung Chung and A. Churyn and Vincent Cianciolo and C. R. Cleven and Yann Cobigo and Bethany Cole and M. P. Comets and Peter Constantin and M{\'a}t{\'e} Csan{\'a}d and Tam{\'a}s Cs{\"o}rgő and Thomas Dahms and Kaushik K. Das and Gyula D{\'a}vid and M. Brett Deaton and Klaus Dehmelt and H. Delagrange and Alexei Denisov and David d'Enterria and Ashwini Deshpande and E. J. Desmond and O. Dietzsch and Andre R. Dion and Michael Donadelli and J. L. Drachenberg and Olivier Drapier and Axel Drees and Archi Dubey and A. A. Durum and Vasily Dzhordzhadze and Y Efremenko and J. Egdemir and Frank Ellinghaus and Wessam Emam and A. Enokizono and H En'yo and B. Espagnon and Shinichi Esumi and K. Oleg Eyser and D. E. Fields and Markus Finger and François. Fleuret and S. L. Fokin and Benjamin Forestier and Z. Fraenkel and Jamie Frantz and Achim Franz and A. D. Frawley and Kohei Fujiwara and Yoshinori Fukao and S Y Fung and Takahiro Fusayasu and S. Gadrat and Irakli Garishvili and F. Gastineau and Mark Germain and A. Bednarcyk Glenn and Hao Gong and M. Gonin and Jean Gosset and Yoshiaki Goto and R. Granier de Cassagnac and Nathan Grau and Shamola Greene and Maria T Grosse Perdekamp and Tomohiko Gunji and H. A. Gustafsson and T. Hachiya and A Hadj Henni and C. Haegemann and John S. Haggerty and Manabu Hagiwara and Hideki Hamagaki and Runze Han and Hiroshi Harada and Edward P. Hartouni and Koichi Haruna and Matthew I. Harvey and E. Haslum and Kazumi Hasuko and Ryugo S. Hayano and Michelle Heffner and Thomas K. Hemmick and Tom Hester and Johann M. Heuser and Xiuxiu He and H. Hiejima and J. Colin Hill and Roderick Hobbs and M. Hohlmann and M. Holmes and W. Holzmann and Kensuke Homma and Boeui Hong and Takahiro Horaguchi and David Hornback and Min Goo Hur and Takashi Ichihara and Kenichi Imai and Michi-aki Inaba and Yusuke Inoue and Donald Isenhower and L. D. Isenhower and Masafumi Ishihara and Toshiaki Isobe and Michael Issah and A. Yu. Isupov and Barbara Jacak and Jiangyong Jia and Jin Zhang Jin and Osamu Jinnouchi and Bryan M. Johnson and Koan Sik Joo and Dr B. Jouan and Fumie Kajihara and Shigeki Kametani and N. Kamihara and June Kamin and Masashi Kaneta and J. H. Kang and Hodaka Kanou and Tetsuya Kawagishi and D. Kawall and Anatolij Kazantsev and Sean Uberoi Kelly and A. V. Khanzadeev and Jun Kikuchi and Daegeun Kim and Diana J. Kim and E. J. Kim and Y G Kim and Ellyne Kinney and Annam{\'a}ria Kiss and Edward Kistenev and A. Kiyomichi and Jennifer L. Klay and Christian Klein-B{\"o}sing and Leonid Kochenda and Valeri Kochetkov and B D Komkov and Masae Konno and D. Kotchetkov and A. D. Kozlov and Adam Kr{\'a}l and Alan Kravitz and Pieter J Kroon and J. Kubart and Gerd J. Kunde and Naoki Kurihara and K. Kurita and M. J. Kweon and Youngjoon Kwon and Gregory Kyle and Roy Lacey and Y S Lai and John G. Lajoie and A. Lebedev and Y. Le Bornec and Sarah Leckey and Dongwon Lee and Mi Kyung Lee and T. Lee and Michael J. Leitch and Marco A. L. Leite and B. Lenzi and Hyuneui Lim and Tomas Liska and Alexander Litvinenko and Ming Xiong Liu and Xinhai Li and Brian Love and Doug Lynch and C. F. Maguire and Y. I. Makdisi and Alexey Malakhov and Michael Malik and Vladimir I. Manko and Ying-nan Mao and Libor Masek and Hiroshi Masui and Felix Matathias and Matt Mccain and Michael C. Mccumber and P. L. McGaughey and Yasushi Miake and Peter Mikes and Kenji Miki and Tyrus Miller and Alexander Milov and Saskia Mioduszewski and Govinda C Mishra and Monika R. Mishra and Jerry T. Mitchell and Michael. Mitrovski and Astrid Morreale and Daniel Paul Morrison and James Moss and T. V. Moukhanova and Debsankar Mukhopadhyay and Jiro Murata and S. Nagamiya and Yorito Nagata and James L Nagle and maxim. naglis and Itaru Nakagawa and Y. Nakamiya and Takashi Nakamura and Kenichi Nakano and J E Newby and Minh Vu Chuong Nguyen and Ben B Norman and A. S. Nyanin and Joakim Nystrand and E O'brien and Shigekazu Oda and Craig A. Ogilvie and Hiroyuki Ohnishi and I. D. Ojha and Hiroshi Okada and Kiyoka Okada and Mizuki Oka and O. O. Omiwade and Agneta Oskarsson and I. Otterlund and Masanao Ouchida and Kin'ya Ozawa and Robert Pak and Dipali Pal and A. P. T. Palounek and V. S. Pantuev and Vassili Papavassiliou and J. Park and Woo Jin Park and Stephen F. Pate and H. Pei and J-C Peng and H. Ferrer Pereira and V. F. Peresedov and Dmitri Peressounko and Christopher Pinkenburg and R. P. Pisani and M. L. Purschke and A. K. Purwar and Haidong Qu and Jan Rak and Andry M. Rakotozafindrabe and I. Ravinovich and K. F. Read and S. Rembeczki and Martin Reuter and Klaus Reygers and V O Riabov and Yu Riabov and G. Roche and Andreia Romana and Mario Rosati and S. S. E. Rosendahl and P. Rosnet and P. V. Rukoyatkin and V. L. Rykov and Seong Shick Ryu and Baldo Sahlmueller and Naohito Saito and Takao Sakaguchi and Shiro Sakai and Hideaki Sakata and Vladislav Samsonov and Hideomi Sato and Satoshi Sato and Shoji Sawada and Jens-Christian Seele and Reinhard Seidl and Vadim Semenov and Richard Seto and Deepali Sharma and Terence K Shea and I. V. Shein and Andrey Shevel and T A Shibata and K. Shigaki and Maya Shimomura and T. Shohjoh and Kohei Shoji and Anne Sickles and Cesar Luiz Pinto Ayres Coelho da Silva and D. Silvermyr and Catherine Silvestre and K. S. Sim and Chandan Pal Singh and Vibhor Singh and Steven Eugene Skutnik and M. Slune{\vc}ka and Walter C. Smith and Alexander Soldatov and Ron A. Soltz and Walter Sondheim and Soren P. Sorensen and I. Sourikova and Florent Staley and P. W. Stankus and E. Stenlund and Misha Stepanov and Andr{\'a}s Ster and S. P. Stoll and T. Sugitate and Colby Suire and John P. Sullivan and Janos Sziklai and Tsuguchika Tabaru and Shin-ichiro Takagi and E. M. Takagui and Atsushi Taketani and Koichiro Tanaka and Yu Tanaka and Kiyoshi Tanida and Michael J. Tannenbaum and Arkadij Taranenko and Paul Tarjan and Timothy L. Thomas and Morihiko Togawa and Alberica Toia and Junji Tojo and Ladislav Tom{\'a}{\vs}ek and Hitoshi Torii and Rusty Towell and V-N Tram and Itzhak Tserruya and Yasuo Tsuchimoto and Sagun K Tuli and H. Tydesj{\"o} and Nikolay Tyurin and Chris Vale and H{\'e}ctor Valle and H W van Hecke and Julia Velkovska and R. V{\'e}rtesi and Artem Vinogradov and M. Virius and Vaclav Vrba and E. A. Vznuzdaev and Mike Wagner and David Q. Walker and X. Renshaw Wang and Y. S. Watanabe and Jaap Wessels and Sebastian N. White and Natalie Willis and D. Winter and C. L. Woody and Matthew Wysocki and Wei Xie and Youhei Yamaguchi and Amber Yanovich and Zulfigar bin Yasin and Jiangang Ying and Satoshi Yokkaichi and Glenn R. Young and Ishrat Younus and I. E. Yushmanov and William A Zajc and O. Zaudtke and Chuanwei Zhang and S. J. Zhou and J{\'o}zsef Zim{\'a}nyi and L. S. Zolin},
  journal={Physical review letters},
  volume={104 13},
The production of e+ e- pairs for m(e+ e-)<0.3 GeV/c2 and 1<p(T)<5 GeV/c is measured in p+p and Au+Au collisions at square root(S(NN))=200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au+Au collisions, the excess of the direct photon yield over p+p is exponential in transverse momentum, with an inverse slope T=221+/-19(stat)+/-19(syst) MeV. Hydrodynamical models with… CONTINUE READING
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