Measurement of direct photon production in p+p collisions at sqrt[s] = 200 GeV

S S Adler; S Afanasiev; C Aidala; N N Ajitanand; Y Akiba; A Al-Jamel; J Alexander; K Aoki; L Aphecetche; R Armendariz; S H Aronson; R Averbeck; T C Awes; V Babintsev; A Baldisseri; K N Barish; P D Barnes; B Bassalleck; S Bathe; S Batsouli; V Baublis; F Bauer; A Bazilevsky; S Belikov; M T Bjorndal; J G Boissevain; H Borel; M L Brooks; D S Brown; N Bruner; D Bucher; H Buesching; V Bumazhnov; G Bunce; J M Burward-Hoy; S Butsyk; X Camard; P Chand; W C Chang; S Chernichenko; C Y Chi; J Chiba; M Chiu; I J Choi; R K Choudhury; T Chujo; V Cianciolo; Y Cobigo; B A Cole; M P Comets; P Constantin; M Csanád; T Csörgo; J P Cussonneau; D d'Enterria; K Das; G David; F Deák; H Delagrange; A Denisov; A Deshpande; E J Desmond; A Devismes; O Dietzsch; J L Drachenberg; O Drapier; A Drees; A Durum; D Dutta; V Dzhordzhadze; Y V Efremenko; H En'yo; B Espagnon; S Esumi; D E Fields; C Finck; F Fleuret; S L Fokin; B D Fox; Z Fraenkel; J E Frantz; A Franz; A D Frawley; Y Fukao; S-Y Fung; S Gadrat; M Germain; A Glenn; M Gonin; J Gosset; Y Goto; R Granier de Cassagnac; N Grau; S V Greene; M Grosse Perdekamp; H-A Gustafsson; T Hachiya; J S Haggerty; H Hamagaki; A G Hansen; E P Hartouni; M Harvey; K Hasuko; R Hayano; X He; M Heffner; T K Hemmick; J M Heuser; P Hidas; H Hiejima; J C Hill; R Hobbs; W Holzmann; K Homma; B Hong; A Hoover; T Horaguchi; T Ichihara; V V Ikonnikov; K Imai; M Inaba; M Inuzuka; D Isenhower; L Isenhower; M Ishihara; M Issah; A Isupov; B V Jacak; J Jia; O Jinnouchi; B M Johnson; S C Johnson; K S Joo; D Jouan; F Kajihara; S Kametani; N Kamihara; M Kaneta; J H Kang; K Katou; T Kawabata; A V Kazantsev; S Kelly; B Khachaturov; A Khanzadeev; J Kikuchi; D J Kim; E Kim; G-B Kim; H J Kim; E Kinney; A Kiss; E Kistenev; A Kiyomichi; C Klein-Boesing; H Kobayashi; L Kochenda; V Kochetkov; R Kohara; B Komkov; M Konno; D Kotchetkov; A Kozlov; P J Kroon; C H Kuberg; G J Kunde; K Kurita; M J Kweon; Y Kwon; G S Kyle; R Lacey; J G Lajoie; Y Le Bornec; A Lebedev; S Leckey; D M Lee; M J Leitch; M A L Leite; X H Li; H Lim; A Litvinenko; M X Liu; C F Maguire; Y I Makdisi; A Malakhov; V I Manko; Y Mao; G Martinez; H Masui; F Matathias; T Matsumoto; M C McCain; P L McGaughey; Y Miake; T E Miller; A Milov; S Mioduszewski; G C Mishra; J T Mitchell; A K Mohanty; D P Morrison; J M Moss; D Mukhopadhyay; M Muniruzzaman; S Nagamiya; J L Nagle; T Nakamura; J Newby; A S Nyanin; J Nystrand; E O'brien; C A Ogilvie; H Ohnishi; I D Ojha; H Okada; K Okada; A Oskarsson; I Otterlund; K Oyama; K Ozawa; D Pal; A P T Palounek; V Pantuev; V Papavassiliou; J Park; W J Park; S F Pate; H Pei; V Penev; J-C Peng; H Pereira; V Peresedov; A Pierson; C Pinkenburg; R P Pisani; M L Purschke; A K Purwar; J M Qualls; J Rak; I Ravinovich; K F Read; M Reuter; K Reygers; V Riabov; Y Riabov; G Roche; A Romana; M Rosati; S S E Rosendahl; P Rosnet; V L Rykov; S S Ryu; N Saito; T Sakaguchi; S Sakai; V Samsonov; L Sanfratello; R Santo; H D Sato; S Sato; S Sawada; Y Schutz; V Semenov; R Seto; T K Shea; I Shein; T-A Shibata; K Shigaki; M Shimomura; A Sickles; C L Silva; D Silvermyr; K S Sim; 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; J P Sullivan; S Takagi; E M Takagui; A Taketani; K H Tanaka; Y Tanaka; K Tanida; M J Tannenbaum; A Taranenko; P Tarján; T L Thomas; M Togawa; J Tojo; H Torii; R S Towell; V-N Tram; I Tserruya; Y Tsuchimoto; H Tydesjö; N Tyurin; T J Uam; J Velkovska; M Velkovsky; V Veszprémi; A A Vinogradov; M A Volkov; E Vznuzdaev; X R Wang; Y Watanabe; S N White; N Willis; F K Wohn; C L Woody; W Xie; A Yanovich; S Yokkaichi; G R Young; I E Yushmanov; W A Zajc; O Zaudtke; C Zhang; S Zhou; J Zimányi; L Zolin; X Zong; H W Van Hecke; PHENIX Collaboration

doi:10.1103/PhysRevLett.98.012002

Measurement of direct photon production in p+p collisions at sqrt[s] = 200 GeV

Phys Rev Lett. 2007 Jan 5;98(1):012002. doi: 10.1103/PhysRevLett.98.012002. Epub 2007 Jan 5.

Authors

S S Adler¹, S Afanasiev, C Aidala, N N Ajitanand, Y Akiba, A Al-Jamel, J Alexander, K Aoki, L Aphecetche, R Armendariz, S H Aronson, R Averbeck, T C Awes, V Babintsev, A Baldisseri, K N Barish, P D Barnes, B Bassalleck, S Bathe, S Batsouli, V Baublis, F Bauer, A Bazilevsky, S Belikov, M T Bjorndal, J G Boissevain, H Borel, M L Brooks, D S Brown, N Bruner, D Bucher, H Buesching, V Bumazhnov, G Bunce, J M Burward-Hoy, S Butsyk, X Camard, P Chand, W C Chang, S Chernichenko, C Y Chi, J Chiba, M Chiu, I J Choi, R K Choudhury, T Chujo, V Cianciolo, Y Cobigo, B A Cole, M P Comets, P Constantin, M Csanád, T Csörgo, J P Cussonneau, D d'Enterria, K Das, G David, F Deák, H Delagrange, A Denisov, A Deshpande, E J Desmond, A Devismes, O Dietzsch, J L Drachenberg, O Drapier, A Drees, A Durum, D Dutta, V Dzhordzhadze, Y V Efremenko, H En'yo, B Espagnon, S Esumi, D E Fields, C Finck, F Fleuret, S L Fokin, B D Fox, Z Fraenkel, J E Frantz, A Franz, A D Frawley, Y Fukao, S-Y Fung, S Gadrat, M Germain, A Glenn, M Gonin, J Gosset, Y Goto, R Granier de Cassagnac, N Grau, S V Greene, M Grosse Perdekamp, H-A Gustafsson, T Hachiya, J S Haggerty, H Hamagaki, A G Hansen, E P Hartouni, M Harvey, K Hasuko, R Hayano, X He, M Heffner, T K Hemmick, J M Heuser, P Hidas, H Hiejima, J C Hill, R Hobbs, W Holzmann, K Homma, B Hong, A Hoover, T Horaguchi, T Ichihara, V V Ikonnikov, K Imai, M Inaba, M Inuzuka, D Isenhower, L Isenhower, M Ishihara, M Issah, A Isupov, B V Jacak, J Jia, O Jinnouchi, B M Johnson, S C Johnson, K S Joo, D Jouan, F Kajihara, S Kametani, N Kamihara, M Kaneta, J H Kang, K Katou, T Kawabata, A V Kazantsev, S Kelly, B Khachaturov, A Khanzadeev, J Kikuchi, D J Kim, E Kim, G-B Kim, H J Kim, E Kinney, A Kiss, E Kistenev, A Kiyomichi, C Klein-Boesing, H Kobayashi, L Kochenda, V Kochetkov, R Kohara, B Komkov, M Konno, D Kotchetkov, A Kozlov, P J Kroon, C H Kuberg, G J Kunde, K Kurita, M J Kweon, Y Kwon, G S Kyle, R Lacey, J G Lajoie, Y Le Bornec, A Lebedev, S Leckey, D M Lee, M J Leitch, M A L Leite, X H Li, H Lim, A Litvinenko, M X Liu, C F Maguire, Y I Makdisi, A Malakhov, V I Manko, Y Mao, G Martinez, H Masui, F Matathias, T Matsumoto, M C McCain, P L McGaughey, Y Miake, T E Miller, A Milov, S Mioduszewski, G C Mishra, J T Mitchell, A K Mohanty, D P Morrison, J M Moss, D Mukhopadhyay, M Muniruzzaman, S Nagamiya, J L Nagle, T Nakamura, J Newby, A S Nyanin, J Nystrand, E O'brien, C A Ogilvie, H Ohnishi, I D Ojha, H Okada, K Okada, A Oskarsson, I Otterlund, K Oyama, K Ozawa, D Pal, A P T Palounek, V Pantuev, V Papavassiliou, J Park, W J Park, S F Pate, H Pei, V Penev, J-C Peng, H Pereira, V Peresedov, A Pierson, C Pinkenburg, R P Pisani, M L Purschke, A K Purwar, J M Qualls, J Rak, I Ravinovich, K F Read, M Reuter, K Reygers, V Riabov, Y Riabov, G Roche, A Romana, M Rosati, S S E Rosendahl, P Rosnet, V L Rykov, S S Ryu, N Saito, T Sakaguchi, S Sakai, V Samsonov, L Sanfratello, R Santo, H D Sato, S Sato, S Sawada, Y Schutz, V Semenov, R Seto, T K Shea, I Shein, T-A Shibata, K Shigaki, M Shimomura, A Sickles, C L Silva, D Silvermyr, K S Sim, 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, J P Sullivan, S Takagi, E M Takagui, A Taketani, K H Tanaka, Y Tanaka, K Tanida, M J Tannenbaum, A Taranenko, P Tarján, T L Thomas, M Togawa, J Tojo, H Torii, R S Towell, V-N Tram, I Tserruya, Y Tsuchimoto, H Tydesjö, N Tyurin, T J Uam, J Velkovska, M Velkovsky, V Veszprémi, A A Vinogradov, M A Volkov, E Vznuzdaev, X R Wang, Y Watanabe, S N White, N Willis, F K Wohn, C L Woody, W Xie, A Yanovich, S Yokkaichi, G R Young, I E Yushmanov, W A Zajc, O Zaudtke, C Zhang, S Zhou, J Zimányi, L Zolin, X Zong, H W Van Hecke; PHENIX Collaboration

Affiliation

¹ Brookhaven National Laboratory, Upton, NY 11973-5000, USA.

PMID: 17358469
DOI: 10.1103/PhysRevLett.98.012002

Abstract

Cross sections for midrapidity production of direct photons in p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for transverse momenta of 3 < pT < 16 GeV/c. Next-to-leading order perturbative QCD (pQCD) describes the data well for pT >5 GeV/c, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for pT >7 GeV/c.