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Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at Midrapidity

The differential cross section for the production of direct photons in p+p collisions at sqrt(s)=200 GeV at midrapidity was measured in the PHENIX detector at the Relativistic Heavy Ion Collider. Inclusive-direct photons were measured in the transverse-momentum range from 5.5--25 GeV/c, extending the range beyond previous measurements. Event structure was studied with an isolation criterion. Next-to-leading-order perturbative-quantum-chromodynamics calculations give a good description of the spectrum. When the cross section is expressed versus x_T, the PHENIX data are seen to be in agreement with measurements from other experiments at different center-of-mass energies.

preprint2012arXivOpen access

A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell B. S. Chang W. C. Chang J. -L. Charvet S. Chernichenko C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron B. A. Cole P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku K. Das G. David A. Denisov D. d'Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger Jr F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H. -Å. Gustafsson A. Hadj Henni J. S. Haggerty H. Hamagaki R. Han E. P. Hartouni K. Haruna E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky D. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. I. Kim D. H. Kim D. J. Kim E. Kim S. H. Kim E. Kinney K. Kiriluk Á. Kiss E. Kistenev J. Klay C. Klein-Boesing L. Kochenda B. Komkov M. Konno J. Koster A. Kozlov A. Král A. Kravitz G. J. Kunde K. Kurita M. Kurosawa M. J. Kweon Y. Kwon G. S. Kyle R. Lacey Y. S. Lai J. G. Lajoie D. Layton A. Lebedev D. M. Lee K. B. Lee T. Lee M. J. Leitch M. A. L. Leite B. Lenzi X. Li P. Liebing T. Liška A. Litvinenko H. Liu M. X. Liu B. Love D. Lynch C. F. Maguire Y. I. Makdisi A. Malakhov M. D. Malik V. I. Manko E. Mannel Y. Mao L. Mašek H. Masui F. Matathias M. McCumber P. L. McGaughey N. Means B. Meredith Y. Miake P. Mikeš K. Miki A. Milov M. Mishra J. T. Mitchell A. K. Mohanty Y. Morino A. Morreale D. P. Morrison T. V. Moukhanova D. Mukhopadhyay J. Murata S. Nagamiya J. L. Nagle M. Naglis M. I. Nagy I. Nakagawa Y. Nakamiya T. Nakamura K. Nakano J. Newby M. Nguyen T. Niita R. Nouicer A. S. Nyanin E. O'Brien S. X. Oda C. A. Ogilvie M. Oka K. Okada Y. Onuki A. Oskarsson M. Ouchida K. Ozawa R. Pak A. P. T. Palounek V. Pantuev V. Papavassiliou J. Park W. J. Park S. F. Pate H. Pei J. -C. Peng H. Pereira V. Peresedov D. Yu. Peressounko C. Pinkenburg M. L. Purschke A. K. Purwar H. Qu J. Rak A. Rakotozafindrabe I. Ravinovich K. F. Read S. Rembeczki K. Reygers V. Riabov Y. Riabov D. Roach G. Roche S. D. Rolnick M. Rosati S. S. E. Rosendahl P. Rosnet P. Rukoyatkin P. Ružička V. L. Rykov B. Sahlmueller N. Saito T. Sakaguchi S. Sakai K. Sakashita V. Samsonov T. Sato S. Sawada K. Sedgwick J. Seele R. Seidl A. Yu. Semenov V. Semenov R. Seto D. Sharma I. Shein T. -A. Shibata K. Shigaki M. Shimomura K. Shoji P. Shukla A. Sickles C. L. Silva D. Silvermyr C. Silvestre K. S. Sim B. K. Singh C. P. Singh V. Singh M. Slunečka A. Soldatov R. A. Soltz W. E. Sondheim S. P. Sorensen I. V. Sourikova F. Staley P. W. Stankus E. Stenlund M. Stepanov A. Ster S. P. Stoll T. Sugitate C. Suire A. Sukhanov J. Sziklai E. M. Takagui A. Taketani R. Tanabe Y. Tanaka K. Tanida M. J. Tannenbaum A. Taranenko P. Tarján H. Themann T. L. Thomas M. Togawa A. Toia L. Tomášek Y. Tomita H. Torii R. S. Towell V-N. Tram I. Tserruya Y. Tsuchimoto C. Vale H. Valle H. W. van Hecke A. Veicht J. Velkovska R. Vértesi A. A. Vinogradov M. Virius V. Vrba E. Vznuzdaev X. R. Wang Y. Watanabe F. Wei J. Wessels S. N. White D. Winter C. L. Woody M. Wysocki W. Xie Y. L. Yamaguchi K. Yamaura R. Yang A. Yanovich J. Ying S. Yokkaichi G. R. Young I. Younus I. E. Yushmanov W. A. Zajc O. Zaudtke C. Zhang S. Zhou L. Zolin

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Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at Midrapidity

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