Measurement of direct photons in Au+Au collisions at √s NN=200GeV

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, B. Azmoun, V. Babintsev, A. Baldisseri, K. N. Barish, P. D. Barnes, B. Bassalleck, S. Bathe, S. BatsouliV. Baublis, F. Bauer, A. Bazilevsky, S. Belikov, R. Bennett, Y. Berdnikov, M. T. Bjorndal, J. G. Boissevain, H. Borel, K. Boyle, M. L. Brooks, D. S. Brown, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, J. M. Burward-Hoy, S. Butsyk, S. Campbell, J. S. Chai, S. Chernichenko, C. Y. Chi, J. Chiba, M. Chiu, I. J. Choi, T. Chujo, V. Cianciolo, C. R. Cleven, Y. Cobigo, B. A. Cole, M. P. Comets, M. Connors, P. Constantin, M. Csanád, T. Csörgo, T. Dahms, K. Das, G. David, H. Delagrange, A. Denisov, D. D'Enterria, A. Deshpande, E. J. Desmond, O. Dietzsch, A. Dion, J. L. Drachenberg, O. Drapier, A. Drees, A. K. Dubey, A. Durum, V. Dzhordzhadze, Y. V. Efremenko, J. Egdemir, A. Enokizono, H. En'Yo, B. Espagnon, S. Esumi, D. E. Fields, F. Fleuret, S. L. Fokin, B. Forestier, Z. Fraenkel, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukao, S. Y. Fung, S. Gadrat, F. Gastineau, M. Germain, A. Glenn, M. Gonin, J. Gosset, Y. Goto, R. Granier De Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, H. A. Gustafsson, T. Hachiya, A. Hadj Henni, J. S. Haggerty, M. N. Hagiwara, H. Hamagaki, H. Harada, E. P. Hartouni, K. Haruna, M. Harvey, E. Haslum, K. Hasuko, R. Hayano, X. He, M. Heffner, T. K. Hemmick, J. M. Heuser, H. Hiejima, J. C. Hill, R. Hobbs, M. Holmes, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, M. G. Hur, T. Ichihara, H. Iinuma, K. Imai, J. Imrek, M. Inaba, D. Isenhower, L. Isenhower, M. Ishihara, T. Isobe, M. Issah, A. Isupov, B. V. Jacak, J. Jia, J. Jin, O. Jinnouchi, B. M. Johnson, K. S. Joo, D. Jouan, F. Kajihara, S. Kametani, N. Kamihara, M. Kaneta, J. H. Kang, T. Kawagishi, A. V. Kazantsev, S. Kelly, A. Khanzadeev, D. J. Kim, E. Kim, Y. S. Kim, E. Kinney, A. Kiss, E. Kistenev, A. Kiyomichi, C. Klein-Boesing, L. Kochenda, V. Kochetkov, B. Komkov, M. Konno, D. Kotchetkov, A. Kozlov, P. J. Kroon, G. J. Kunde, N. Kurihara, K. Kurita, M. J. Kweon, Y. Kwon, G. S. Kyle, R. Lacey, J. G. Lajoie, A. Lebedev, Y. Le Bornec, S. Leckey, D. M. Lee, M. K. 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, M. D. Malik, V. I. Manko, H. Masui, F. Matathias, M. C. McCain, P. L. McGaughey, Y. Miake, T. E. Miller, A. Milov, S. Mioduszewski, G. C. Mishra, J. T. Mitchell, D. P. Morrison, J. M. Moss, T. V. Moukhanova, D. Mukhopadhyay, J. Murata, S. Nagamiya, Y. Nagata, J. L. Nagle, M. Naglis, T. Nakamura, J. Newby, M. Nguyen, B. E. Norman, A. S. Nyanin, J. Nystrand, E. O'Brien, C. A. Ogilvie, H. Ohnishi, I. D. Ojha, K. Okada, O. O. Omiwade, A. Oskarsson, I. Otterlund, K. Ozawa, R. Pak, D. Pal, 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, R. P. Pisani, M. L. Purschke, A. K. Purwar, H. Qu, 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, P. Rukoyatkin, V. L. Rykov, S. S. Ryu, B. Sahlmueller, N. Saito, T. Sakaguchi, S. Sakai, V. Samsonov, H. D. Sato, S. Sato, S. Sawada, V. Semenov, R. Seto, D. Sharma, T. K. Shea, I. Shein, T. A. Shibata, K. Shigaki, M. Shimomura, T. Shohjoh, K. Shoji, A. Sickles, C. L. Silva, D. Silvermyr, K. S. Sim, C. P. Singh, V. Singh, S. Skutnik, W. C. Smith, 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, J. P. Sullivan, J. Sziklai, T. Tabaru, 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, S. K. Tuli, H. Tydesjö, N. Tyurin, C. Vale, H. Valle, H. W. Van Hecke, J. Velkovska, R. Vértesi, A. A. Vinogradov, E. Vznuzdaev, M. Wagner, X. R. Wang, Y. Watanabe, J. Wessels, S. N. White, N. Willis, D. Winter, C. L. Woody, M. Wysocki, W. Xie, A. Yanovich, S. Yokkaichi, G. R. Young, I. Younus, I. E. Yushmanov, W. A. Zajc, O. Zaudtke, C. Zhang, J. Zimányi, L. Zolin

Research output: Contribution to journalArticle

Abstract

We report the measurement of direct photons at midrapidity in Au+Au collisions at √s NN=200GeV. The direct photon signal was extracted for the transverse momentum range of 4GeV/c<p T<22GeV/ c, using a statistical method to subtract decay photons from the inclusive photon sample. 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. R AA was found to be consistent with unity for all centralities over the entire measured p T range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.

Original languageEnglish (US)
Article number152302
JournalPhysical review letters
Volume109
Issue number15
DOIs
StatePublished - Oct 9 2012

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collisions
photons
partons
unity
transverse momentum
bremsstrahlung
fragmentation
distribution functions
retarding
quarks
nuclei
decay
predictions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Jamel, A., Alexander, J., ... Zolin, L. (2012). Measurement of direct photons in Au+Au collisions at √s NN=200GeV. Physical review letters, 109(15), [152302]. https://doi.org/10.1103/PhysRevLett.109.152302

Measurement of direct photons in Au+Au collisions at √s NN=200GeV. / Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Al-Jamel, A.; Alexander, J.; Aoki, K.; Aphecetche, L.; Armendariz, R.; Aronson, S. H.; Averbeck, R.; Awes, T. C.; Azmoun, B.; Babintsev, V.; Baldisseri, A.; Barish, K. N.; Barnes, P. D.; Bassalleck, B.; Bathe, S.; Batsouli, S.; Baublis, V.; Bauer, F.; Bazilevsky, A.; Belikov, S.; Bennett, R.; Berdnikov, Y.; Bjorndal, M. T.; Boissevain, J. G.; Borel, H.; Boyle, K.; Brooks, M. L.; Brown, D. S.; Bucher, D.; Buesching, H.; Bumazhnov, V.; Bunce, G.; Burward-Hoy, J. M.; Butsyk, S.; Campbell, S.; Chai, J. S.; Chernichenko, S.; Chi, C. Y.; Chiba, J.; Chiu, M.; Choi, I. J.; Chujo, T.; Cianciolo, V.; Cleven, C. R.; Cobigo, Y.; Cole, B. A.; Comets, M. P.; Connors, M.; Constantin, P.; Csanád, M.; Csörgo, T.; Dahms, T.; Das, K.; David, G.; Delagrange, H.; Denisov, A.; D'Enterria, D.; Deshpande, A.; Desmond, E. J.; Dietzsch, O.; Dion, A.; Drachenberg, J. L.; Drapier, O.; Drees, A.; Dubey, A. K.; Durum, A.; Dzhordzhadze, V.; Efremenko, Y. V.; Egdemir, J.; Enokizono, A.; En'Yo, H.; Espagnon, B.; Esumi, S.; Fields, D. E.; Fleuret, F.; Fokin, S. L.; Forestier, B.; Fraenkel, Z.; Frantz, J. E.; Franz, A.; Frawley, A. D.; Fukao, Y.; Fung, S. Y.; Gadrat, S.; Gastineau, F.; Germain, M.; Glenn, A.; Gonin, M.; Gosset, J.; Goto, Y.; Granier De Cassagnac, R.; Grau, N.; Greene, S. V.; Grosse Perdekamp, M.; Gunji, T.; Gustafsson, H. A.; Hachiya, T.; Hadj Henni, A.; Haggerty, J. S.; Hagiwara, M. N.; Hamagaki, H.; Harada, H.; Hartouni, E. P.; Haruna, K.; Harvey, M.; Haslum, E.; Hasuko, K.; Hayano, R.; He, X.; Heffner, M.; Hemmick, T. K.; Heuser, J. M.; Hiejima, H.; Hill, J. C.; Hobbs, R.; Holmes, M.; Holzmann, W.; Homma, K.; Hong, B.; Horaguchi, T.; Hur, M. G.; Ichihara, T.; Iinuma, H.; Imai, K.; Imrek, J.; Inaba, M.; Isenhower, D.; Isenhower, L.; Ishihara, M.; Isobe, T.; Issah, M.; Isupov, A.; Jacak, B. V.; Jia, J.; Jin, J.; Jinnouchi, O.; Johnson, B. M.; Joo, K. S.; Jouan, D.; Kajihara, F.; Kametani, S.; Kamihara, N.; Kaneta, M.; Kang, J. H.; Kawagishi, T.; Kazantsev, A. V.; Kelly, S.; Khanzadeev, A.; Kim, D. J.; Kim, E.; Kim, Y. S.; Kinney, E.; Kiss, A.; Kistenev, E.; Kiyomichi, A.; Klein-Boesing, C.; Kochenda, L.; Kochetkov, V.; Komkov, B.; Konno, M.; Kotchetkov, D.; Kozlov, A.; Kroon, P. J.; Kunde, G. J.; Kurihara, N.; Kurita, K.; Kweon, M. J.; Kwon, Y.; Kyle, G. S.; Lacey, R.; Lajoie, J. G.; Lebedev, A.; Le Bornec, Y.; Leckey, S.; Lee, D. M.; Lee, M. K.; Leitch, M. J.; Leite, M. A.L.; Li, X. H.; Lim, H.; Litvinenko, A.; Liu, M. X.; Maguire, C. F.; Makdisi, Y. I.; Malakhov, A.; Malik, M. D.; Manko, V. I.; Masui, H.; Matathias, F.; McCain, M. C.; McGaughey, P. L.; Miake, Y.; Miller, T. E.; Milov, A.; Mioduszewski, S.; Mishra, G. C.; Mitchell, J. T.; Morrison, D. P.; Moss, J. M.; Moukhanova, T. V.; Mukhopadhyay, D.; Murata, J.; Nagamiya, S.; Nagata, Y.; Nagle, J. L.; Naglis, M.; Nakamura, T.; Newby, J.; Nguyen, M.; Norman, B. E.; Nyanin, A. S.; Nystrand, J.; O'Brien, E.; Ogilvie, C. A.; Ohnishi, H.; Ojha, I. D.; Okada, K.; Omiwade, O. O.; Oskarsson, A.; Otterlund, I.; Ozawa, K.; Pak, R.; Pal, D.; Palounek, A. P.T.; Pantuev, V.; Papavassiliou, V.; Park, J.; Park, W. J.; Pate, S. F.; Pei, H.; Peng, J. C.; Pereira, H.; Peresedov, V.; Peressounko, D. Yu; Pinkenburg, C.; Pisani, R. P.; Purschke, M. L.; Purwar, A. K.; Qu, H.; Rak, J.; Ravinovich, I.; Read, K. F.; Reuter, M.; Reygers, K.; Riabov, V.; Riabov, Y.; Roche, G.; Romana, A.; Rosati, M.; Rosendahl, S. S.E.; Rosnet, P.; Rukoyatkin, P.; Rykov, V. L.; Ryu, S. S.; Sahlmueller, B.; Saito, N.; Sakaguchi, T.; Sakai, S.; Samsonov, V.; Sato, H. D.; Sato, S.; Sawada, S.; Semenov, V.; Seto, R.; Sharma, D.; Shea, T. K.; Shein, I.; Shibata, T. A.; Shigaki, K.; Shimomura, M.; Shohjoh, T.; Shoji, K.; Sickles, A.; Silva, C. L.; Silvermyr, D.; Sim, K. S.; Singh, C. P.; Singh, V.; Skutnik, S.; Smith, W. C.; Soldatov, A.; Soltz, R. A.; Sondheim, W. E.; Sorensen, S. P.; Sourikova, I. V.; Staley, F.; Stankus, P. W.; Stenlund, E.; Stepanov, M.; Ster, A.; Stoll, S. P.; Sugitate, T.; Suire, C.; Sullivan, J. P.; Sziklai, J.; Tabaru, T.; Takagi, S.; Takagui, E. M.; Taketani, A.; Tanaka, K. H.; Tanaka, Y.; Tanida, K.; Tannenbaum, M. J.; Taranenko, A.; Tarján, P.; Thomas, T. L.; Togawa, M.; Tojo, J.; Torii, H.; Towell, R. S.; Tram, V. N.; Tserruya, I.; Tsuchimoto, Y.; Tuli, S. K.; Tydesjö, H.; Tyurin, N.; Vale, C.; Valle, H.; Van Hecke, H. W.; Velkovska, J.; Vértesi, R.; Vinogradov, A. A.; Vznuzdaev, E.; Wagner, M.; Wang, X. R.; Watanabe, Y.; Wessels, J.; White, S. N.; Willis, N.; Winter, D.; Woody, C. L.; Wysocki, M.; Xie, W.; Yanovich, A.; Yokkaichi, S.; Young, G. R.; Younus, I.; Yushmanov, I. E.; Zajc, W. A.; Zaudtke, O.; Zhang, C.; Zimányi, J.; Zolin, L.

In: Physical review letters, Vol. 109, No. 15, 152302, 09.10.2012.

Research output: Contribution to journalArticle

Afanasiev, S, Aidala, C, Ajitanand, NN, Akiba, Y, Al-Jamel, A, Alexander, J, Aoki, K, Aphecetche, L, Armendariz, R, Aronson, SH, Averbeck, R, Awes, TC, Azmoun, B, Babintsev, V, Baldisseri, A, Barish, KN, Barnes, PD, Bassalleck, B, Bathe, S, Batsouli, S, Baublis, V, Bauer, F, Bazilevsky, A, Belikov, S, Bennett, R, Berdnikov, Y, Bjorndal, MT, Boissevain, JG, Borel, H, Boyle, K, Brooks, ML, Brown, DS, Bucher, D, Buesching, H, Bumazhnov, V, Bunce, G, Burward-Hoy, JM, Butsyk, S, Campbell, S, Chai, JS, Chernichenko, S, Chi, CY, Chiba, J, Chiu, M, Choi, IJ, Chujo, T, Cianciolo, V, Cleven, CR, Cobigo, Y, Cole, BA, Comets, MP, Connors, M, Constantin, P, Csanád, M, Csörgo, T, Dahms, T, Das, K, David, G, Delagrange, H, Denisov, A, D'Enterria, D, Deshpande, A, Desmond, EJ, Dietzsch, O, Dion, A, Drachenberg, JL, Drapier, O, Drees, A, Dubey, AK, Durum, A, Dzhordzhadze, V, Efremenko, YV, Egdemir, J, Enokizono, A, En'Yo, H, Espagnon, B, Esumi, S, Fields, DE, Fleuret, F, Fokin, SL, Forestier, B, Fraenkel, Z, Frantz, JE, Franz, A, Frawley, AD, Fukao, Y, Fung, SY, Gadrat, S, Gastineau, F, Germain, M, Glenn, A, Gonin, M, Gosset, J, Goto, Y, Granier De Cassagnac, R, Grau, N, Greene, SV, Grosse Perdekamp, M, Gunji, T, Gustafsson, HA, Hachiya, T, Hadj Henni, A, Haggerty, JS, Hagiwara, MN, Hamagaki, H, Harada, H, Hartouni, EP, Haruna, K, Harvey, M, Haslum, E, Hasuko, K, Hayano, R, He, X, Heffner, M, Hemmick, TK, Heuser, JM, Hiejima, H, Hill, JC, Hobbs, R, Holmes, M, Holzmann, W, Homma, K, Hong, B, Horaguchi, T, Hur, MG, Ichihara, T, Iinuma, H, Imai, K, Imrek, J, Inaba, M, Isenhower, D, Isenhower, L, Ishihara, M, Isobe, T, Issah, M, Isupov, A, Jacak, BV, Jia, J, Jin, J, Jinnouchi, O, Johnson, BM, Joo, KS, Jouan, D, Kajihara, F, Kametani, S, Kamihara, N, Kaneta, M, Kang, JH, Kawagishi, T, Kazantsev, AV, Kelly, S, Khanzadeev, A, Kim, DJ, Kim, E, Kim, YS, Kinney, E, Kiss, A, Kistenev, E, Kiyomichi, A, Klein-Boesing, C, Kochenda, L, Kochetkov, V, Komkov, B, Konno, M, Kotchetkov, D, Kozlov, A, Kroon, PJ, Kunde, GJ, Kurihara, N, Kurita, K, Kweon, MJ, Kwon, Y, Kyle, GS, Lacey, R, Lajoie, JG, Lebedev, A, Le Bornec, Y, Leckey, S, Lee, DM, Lee, MK, Leitch, MJ, Leite, MAL, Li, XH, Lim, H, Litvinenko, A, Liu, MX, Maguire, CF, Makdisi, YI, Malakhov, A, Malik, MD, Manko, VI, Masui, H, Matathias, F, McCain, MC, McGaughey, PL, Miake, Y, Miller, TE, Milov, A, Mioduszewski, S, Mishra, GC, Mitchell, JT, Morrison, DP, Moss, JM, Moukhanova, TV, Mukhopadhyay, D, Murata, J, Nagamiya, S, Nagata, Y, Nagle, JL, Naglis, M, Nakamura, T, Newby, J, Nguyen, M, Norman, BE, Nyanin, AS, Nystrand, J, O'Brien, E, Ogilvie, CA, Ohnishi, H, Ojha, ID, Okada, K, Omiwade, OO, Oskarsson, A, Otterlund, I, Ozawa, K, Pak, R, Pal, D, Palounek, APT, Pantuev, V, Papavassiliou, V, Park, J, Park, WJ, Pate, SF, Pei, H, Peng, JC, Pereira, H, Peresedov, V, Peressounko, DY, Pinkenburg, C, Pisani, RP, Purschke, ML, Purwar, AK, Qu, H, Rak, J, Ravinovich, I, Read, KF, Reuter, M, Reygers, K, Riabov, V, Riabov, Y, Roche, G, Romana, A, Rosati, M, Rosendahl, SSE, Rosnet, P, Rukoyatkin, P, Rykov, VL, Ryu, SS, Sahlmueller, B, Saito, N, Sakaguchi, T, Sakai, S, Samsonov, V, Sato, HD, Sato, S, Sawada, S, Semenov, V, Seto, R, Sharma, D, Shea, TK, Shein, I, Shibata, TA, Shigaki, K, Shimomura, M, Shohjoh, T, Shoji, K, Sickles, A, Silva, CL, Silvermyr, D, Sim, KS, Singh, CP, Singh, V, Skutnik, S, Smith, WC, Soldatov, A, Soltz, RA, Sondheim, WE, Sorensen, SP, Sourikova, IV, Staley, F, Stankus, PW, Stenlund, E, Stepanov, M, Ster, A, Stoll, SP, Sugitate, T, Suire, C, Sullivan, JP, Sziklai, J, Tabaru, T, Takagi, S, Takagui, EM, Taketani, A, Tanaka, KH, Tanaka, Y, Tanida, K, Tannenbaum, MJ, Taranenko, A, Tarján, P, Thomas, TL, Togawa, M, Tojo, J, Torii, H, Towell, RS, Tram, VN, Tserruya, I, Tsuchimoto, Y, Tuli, SK, Tydesjö, H, Tyurin, N, Vale, C, Valle, H, Van Hecke, HW, Velkovska, J, Vértesi, R, Vinogradov, AA, Vznuzdaev, E, Wagner, M, Wang, XR, Watanabe, Y, Wessels, J, White, SN, Willis, N, Winter, D, Woody, CL, Wysocki, M, Xie, W, Yanovich, A, Yokkaichi, S, Young, GR, Younus, I, Yushmanov, IE, Zajc, WA, Zaudtke, O, Zhang, C, Zimányi, J & Zolin, L 2012, 'Measurement of direct photons in Au+Au collisions at √s NN=200GeV', Physical review letters, vol. 109, no. 15, 152302. https://doi.org/10.1103/PhysRevLett.109.152302
Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Al-Jamel A, Alexander J et al. Measurement of direct photons in Au+Au collisions at √s NN=200GeV. Physical review letters. 2012 Oct 9;109(15). 152302. https://doi.org/10.1103/PhysRevLett.109.152302
Afanasiev, S. ; Aidala, C. ; Ajitanand, N. N. ; Akiba, Y. ; Al-Jamel, A. ; Alexander, J. ; Aoki, K. ; Aphecetche, L. ; Armendariz, R. ; Aronson, S. H. ; Averbeck, R. ; Awes, T. C. ; Azmoun, B. ; Babintsev, V. ; Baldisseri, A. ; Barish, K. N. ; Barnes, P. D. ; Bassalleck, B. ; Bathe, S. ; Batsouli, S. ; Baublis, V. ; Bauer, F. ; Bazilevsky, A. ; Belikov, S. ; Bennett, R. ; Berdnikov, Y. ; Bjorndal, M. T. ; Boissevain, J. G. ; Borel, H. ; Boyle, K. ; Brooks, M. L. ; Brown, D. S. ; Bucher, D. ; Buesching, H. ; Bumazhnov, V. ; Bunce, G. ; Burward-Hoy, J. M. ; Butsyk, S. ; Campbell, S. ; Chai, J. S. ; Chernichenko, S. ; Chi, C. Y. ; Chiba, J. ; Chiu, M. ; Choi, I. J. ; Chujo, T. ; Cianciolo, V. ; Cleven, C. R. ; Cobigo, Y. ; Cole, B. A. ; Comets, M. P. ; Connors, M. ; Constantin, P. ; Csanád, M. ; Csörgo, T. ; Dahms, T. ; Das, K. ; David, G. ; Delagrange, H. ; Denisov, A. ; D'Enterria, D. ; Deshpande, A. ; Desmond, E. J. ; Dietzsch, O. ; Dion, A. ; Drachenberg, J. L. ; Drapier, O. ; Drees, A. ; Dubey, A. K. ; Durum, A. ; Dzhordzhadze, V. ; Efremenko, Y. V. ; Egdemir, J. ; Enokizono, A. ; En'Yo, H. ; Espagnon, B. ; Esumi, S. ; Fields, D. E. ; Fleuret, F. ; Fokin, S. L. ; Forestier, B. ; Fraenkel, Z. ; Frantz, J. E. ; Franz, A. ; Frawley, A. D. ; Fukao, Y. ; Fung, S. Y. ; Gadrat, S. ; Gastineau, F. ; Germain, M. ; Glenn, A. ; Gonin, M. ; Gosset, J. ; Goto, Y. ; Granier De Cassagnac, R. ; Grau, N. ; Greene, S. V. ; Grosse Perdekamp, M. ; Gunji, T. ; Gustafsson, H. A. ; Hachiya, T. ; Hadj Henni, A. ; Haggerty, J. S. ; Hagiwara, M. N. ; Hamagaki, H. ; Harada, H. ; Hartouni, E. P. ; Haruna, K. ; Harvey, M. ; Haslum, E. ; Hasuko, K. ; Hayano, R. ; He, X. ; Heffner, M. ; Hemmick, T. K. ; Heuser, J. M. ; Hiejima, H. ; Hill, J. C. ; Hobbs, R. ; Holmes, M. ; Holzmann, W. ; Homma, K. ; Hong, B. ; Horaguchi, T. ; Hur, M. G. ; Ichihara, T. ; Iinuma, H. ; Imai, K. ; Imrek, J. ; Inaba, M. ; Isenhower, D. ; Isenhower, L. ; Ishihara, M. ; Isobe, T. ; Issah, M. ; Isupov, A. ; Jacak, B. V. ; Jia, J. ; Jin, J. ; Jinnouchi, O. ; Johnson, B. M. ; Joo, K. S. ; Jouan, D. ; Kajihara, F. ; Kametani, S. ; Kamihara, N. ; Kaneta, M. ; Kang, J. H. ; Kawagishi, T. ; Kazantsev, A. V. ; Kelly, S. ; Khanzadeev, A. ; Kim, D. J. ; Kim, E. ; Kim, Y. S. ; Kinney, E. ; Kiss, A. ; Kistenev, E. ; Kiyomichi, A. ; Klein-Boesing, C. ; Kochenda, L. ; Kochetkov, V. ; Komkov, B. ; Konno, M. ; Kotchetkov, D. ; Kozlov, A. ; Kroon, P. J. ; Kunde, G. J. ; Kurihara, N. ; Kurita, K. ; Kweon, M. J. ; Kwon, Y. ; Kyle, G. S. ; Lacey, R. ; Lajoie, J. G. ; Lebedev, A. ; Le Bornec, Y. ; Leckey, S. ; Lee, D. M. ; Lee, M. K. ; Leitch, M. J. ; Leite, M. A.L. ; Li, X. H. ; Lim, H. ; Litvinenko, A. ; Liu, M. X. ; Maguire, C. F. ; Makdisi, Y. I. ; Malakhov, A. ; Malik, M. D. ; Manko, V. I. ; Masui, H. ; Matathias, F. ; McCain, M. C. ; McGaughey, P. L. ; Miake, Y. ; Miller, T. E. ; Milov, A. ; Mioduszewski, S. ; Mishra, G. C. ; Mitchell, J. T. ; Morrison, D. P. ; Moss, J. M. ; Moukhanova, T. V. ; Mukhopadhyay, D. ; Murata, J. ; Nagamiya, S. ; Nagata, Y. ; Nagle, J. L. ; Naglis, M. ; Nakamura, T. ; Newby, J. ; Nguyen, M. ; Norman, B. E. ; Nyanin, A. S. ; Nystrand, J. ; O'Brien, E. ; Ogilvie, C. A. ; Ohnishi, H. ; Ojha, I. D. ; Okada, K. ; Omiwade, O. O. ; Oskarsson, A. ; Otterlund, I. ; Ozawa, K. ; Pak, R. ; Pal, D. ; Palounek, A. P.T. ; Pantuev, V. ; Papavassiliou, V. ; Park, J. ; Park, W. J. ; Pate, S. F. ; Pei, H. ; Peng, J. C. ; Pereira, H. ; Peresedov, V. ; Peressounko, D. Yu ; Pinkenburg, C. ; Pisani, R. P. ; Purschke, M. L. ; Purwar, A. K. ; Qu, H. ; Rak, J. ; Ravinovich, I. ; Read, K. F. ; Reuter, M. ; Reygers, K. ; Riabov, V. ; Riabov, Y. ; Roche, G. ; Romana, A. ; Rosati, M. ; Rosendahl, S. S.E. ; Rosnet, P. ; Rukoyatkin, P. ; Rykov, V. L. ; Ryu, S. S. ; Sahlmueller, B. ; Saito, N. ; Sakaguchi, T. ; Sakai, S. ; Samsonov, V. ; Sato, H. D. ; Sato, S. ; Sawada, S. ; Semenov, V. ; Seto, R. ; Sharma, D. ; Shea, T. K. ; Shein, I. ; Shibata, T. A. ; Shigaki, K. ; Shimomura, M. ; Shohjoh, T. ; Shoji, K. ; Sickles, A. ; Silva, C. L. ; Silvermyr, D. ; Sim, K. S. ; Singh, C. P. ; Singh, V. ; Skutnik, S. ; Smith, W. C. ; Soldatov, A. ; Soltz, R. A. ; Sondheim, W. E. ; Sorensen, S. P. ; Sourikova, I. V. ; Staley, F. ; Stankus, P. W. ; Stenlund, E. ; Stepanov, M. ; Ster, A. ; Stoll, S. P. ; Sugitate, T. ; Suire, C. ; Sullivan, J. P. ; Sziklai, J. ; Tabaru, T. ; Takagi, S. ; Takagui, E. M. ; Taketani, A. ; Tanaka, K. H. ; Tanaka, Y. ; Tanida, K. ; Tannenbaum, M. J. ; Taranenko, A. ; Tarján, P. ; Thomas, T. L. ; Togawa, M. ; Tojo, J. ; Torii, H. ; Towell, R. S. ; Tram, V. N. ; Tserruya, I. ; Tsuchimoto, Y. ; Tuli, S. K. ; Tydesjö, H. ; Tyurin, N. ; Vale, C. ; Valle, H. ; Van Hecke, H. W. ; Velkovska, J. ; Vértesi, R. ; Vinogradov, A. A. ; Vznuzdaev, E. ; Wagner, M. ; Wang, X. R. ; Watanabe, Y. ; Wessels, J. ; White, S. N. ; Willis, N. ; Winter, D. ; Woody, C. L. ; Wysocki, M. ; Xie, W. ; Yanovich, A. ; Yokkaichi, S. ; Young, G. R. ; Younus, I. ; Yushmanov, I. E. ; Zajc, W. A. ; Zaudtke, O. ; Zhang, C. ; Zimányi, J. ; Zolin, L. / Measurement of direct photons in Au+Au collisions at √s NN=200GeV. In: Physical review letters. 2012 ; Vol. 109, No. 15.
@article{99c5585afc7a492bb02babc10f4104bb,
title = "Measurement of direct photons in Au+Au collisions at √s NN=200GeV",
abstract = "We report the measurement of direct photons at midrapidity in Au+Au collisions at √s NN=200GeV. The direct photon signal was extracted for the transverse momentum range of 4GeV/cT<22GeV/ c, using a statistical method to subtract decay photons from the inclusive photon sample. 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. R AA was found to be consistent with unity for all centralities over the entire measured p T range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.",
author = "S. Afanasiev and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and A. Al-Jamel and J. Alexander and K. Aoki and L. Aphecetche and R. Armendariz and Aronson, {S. H.} and R. Averbeck and Awes, {T. C.} and B. Azmoun and V. Babintsev and A. Baldisseri and Barish, {K. N.} and Barnes, {P. D.} and B. Bassalleck and S. Bathe and S. Batsouli and V. Baublis and F. Bauer and A. Bazilevsky and S. Belikov and R. Bennett and Y. Berdnikov and Bjorndal, {M. T.} and Boissevain, {J. G.} and H. Borel and K. Boyle and Brooks, {M. L.} and Brown, {D. S.} and D. Bucher and H. Buesching and V. Bumazhnov and G. Bunce and Burward-Hoy, {J. M.} and S. Butsyk and S. Campbell and Chai, {J. S.} and S. Chernichenko and Chi, {C. Y.} and J. Chiba and M. Chiu and Choi, {I. J.} and T. Chujo and V. Cianciolo and Cleven, {C. R.} and Y. Cobigo and Cole, {B. A.} and Comets, {M. P.} and M. Connors and P. Constantin and M. Csan{\'a}d and T. Cs{\"o}rgo and T. Dahms and K. Das and G. David and H. Delagrange and A. Denisov and D. D'Enterria and A. Deshpande and Desmond, {E. J.} and O. Dietzsch and A. Dion and Drachenberg, {J. L.} and O. Drapier and A. Drees and Dubey, {A. K.} and A. Durum and V. Dzhordzhadze and Efremenko, {Y. V.} and J. Egdemir and A. Enokizono and H. En'Yo and B. Espagnon and S. Esumi and Fields, {D. E.} and F. Fleuret and Fokin, {S. L.} and B. Forestier and Z. Fraenkel and Frantz, {J. E.} and A. Franz and Frawley, {A. D.} and Y. Fukao and Fung, {S. Y.} and S. Gadrat and F. Gastineau and M. Germain and A. Glenn and M. Gonin and J. Gosset and Y. Goto and {Granier De Cassagnac}, R. and N. Grau and Greene, {S. V.} and {Grosse Perdekamp}, M. and T. Gunji and Gustafsson, {H. A.} and T. Hachiya and {Hadj Henni}, A. and Haggerty, {J. S.} and Hagiwara, {M. N.} and H. Hamagaki and H. Harada and Hartouni, {E. P.} and K. Haruna and M. Harvey and E. Haslum and K. Hasuko and R. Hayano and X. He and M. Heffner and Hemmick, {T. K.} and Heuser, {J. M.} and H. Hiejima and Hill, {J. C.} and R. Hobbs and M. Holmes and W. Holzmann and K. Homma and B. Hong and T. Horaguchi and Hur, {M. G.} and T. Ichihara and H. Iinuma and K. Imai and J. Imrek and M. Inaba and D. Isenhower and L. Isenhower and M. Ishihara and T. Isobe and M. Issah and A. Isupov and Jacak, {B. V.} and J. Jia and J. Jin and O. Jinnouchi and Johnson, {B. M.} and Joo, {K. S.} and D. Jouan and F. Kajihara and S. Kametani and N. Kamihara and M. Kaneta and Kang, {J. H.} and T. Kawagishi and Kazantsev, {A. V.} and S. Kelly and A. Khanzadeev and Kim, {D. J.} and E. Kim and Kim, {Y. S.} and E. Kinney and A. Kiss and E. Kistenev and A. Kiyomichi and C. Klein-Boesing and L. Kochenda and V. Kochetkov and B. Komkov and M. Konno and D. Kotchetkov and A. Kozlov and Kroon, {P. J.} and Kunde, {G. J.} and N. Kurihara and K. Kurita and Kweon, {M. J.} and Y. Kwon and Kyle, {G. S.} and R. Lacey and Lajoie, {J. G.} and A. Lebedev and {Le Bornec}, Y. and S. Leckey and Lee, {D. M.} and Lee, {M. K.} and Leitch, {M. J.} and Leite, {M. A.L.} and Li, {X. H.} and H. Lim and A. Litvinenko and Liu, {M. X.} and Maguire, {C. F.} and Makdisi, {Y. I.} and A. Malakhov and Malik, {M. D.} and Manko, {V. I.} and H. Masui and F. Matathias and McCain, {M. C.} and McGaughey, {P. L.} and Y. Miake and Miller, {T. E.} and A. Milov and S. Mioduszewski and Mishra, {G. C.} and Mitchell, {J. T.} and Morrison, {D. P.} and Moss, {J. M.} and Moukhanova, {T. V.} and D. Mukhopadhyay and J. Murata and S. Nagamiya and Y. Nagata and Nagle, {J. L.} and M. Naglis and T. Nakamura and J. Newby and M. Nguyen and Norman, {B. E.} and Nyanin, {A. S.} and J. Nystrand and E. O'Brien and Ogilvie, {C. A.} and H. Ohnishi and Ojha, {I. D.} and K. Okada and Omiwade, {O. O.} and A. Oskarsson and I. Otterlund and K. Ozawa and R. Pak and D. Pal and Palounek, {A. P.T.} and V. Pantuev and V. Papavassiliou and J. Park and Park, {W. J.} and Pate, {S. F.} and H. Pei and Peng, {J. C.} and H. Pereira and V. Peresedov and Peressounko, {D. Yu} and C. Pinkenburg and Pisani, {R. P.} and Purschke, {M. L.} and Purwar, {A. K.} and H. Qu and J. Rak and I. Ravinovich and Read, {K. F.} and M. Reuter and K. Reygers and V. Riabov and Y. Riabov and G. Roche and A. Romana and M. Rosati and Rosendahl, {S. S.E.} and P. Rosnet and P. Rukoyatkin and Rykov, {V. L.} and Ryu, {S. S.} and B. Sahlmueller and N. Saito and T. Sakaguchi and S. Sakai and V. Samsonov and Sato, {H. D.} and S. Sato and S. Sawada and V. Semenov and R. Seto and D. Sharma and Shea, {T. K.} and I. Shein and Shibata, {T. A.} and K. Shigaki and M. Shimomura and T. Shohjoh and K. Shoji and A. Sickles and Silva, {C. L.} and D. Silvermyr and Sim, {K. S.} and Singh, {C. P.} and V. Singh and S. Skutnik and Smith, {W. C.} and A. Soldatov and Soltz, {R. A.} and Sondheim, {W. E.} and Sorensen, {S. P.} and Sourikova, {I. V.} and F. Staley and Stankus, {P. W.} and E. Stenlund and M. Stepanov and A. Ster and Stoll, {S. P.} and T. Sugitate and C. Suire and Sullivan, {J. P.} and J. Sziklai and T. Tabaru and S. Takagi and Takagui, {E. M.} and A. Taketani and Tanaka, {K. H.} and Y. Tanaka and K. Tanida and Tannenbaum, {M. J.} and A. Taranenko and P. Tarj{\'a}n and Thomas, {T. L.} and M. Togawa and J. Tojo and H. Torii and Towell, {R. S.} and Tram, {V. N.} and I. Tserruya and Y. Tsuchimoto and Tuli, {S. K.} and H. Tydesj{\"o} and N. Tyurin and C. Vale and H. Valle and {Van Hecke}, {H. W.} and J. Velkovska and R. V{\'e}rtesi and Vinogradov, {A. A.} and E. Vznuzdaev and M. Wagner and Wang, {X. R.} and Y. Watanabe and J. Wessels and White, {S. N.} and N. Willis and D. Winter and Woody, {C. L.} and M. Wysocki and W. Xie and A. Yanovich and S. Yokkaichi and Young, {G. R.} and I. Younus and Yushmanov, {I. E.} and Zajc, {W. A.} and O. Zaudtke and C. Zhang and J. Zim{\'a}nyi and L. Zolin",
year = "2012",
month = "10",
day = "9",
doi = "10.1103/PhysRevLett.109.152302",
language = "English (US)",
volume = "109",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "15",

}

TY - JOUR

T1 - Measurement of direct photons in Au+Au collisions at √s NN=200GeV

AU - Afanasiev, S.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Al-Jamel, A.

AU - Alexander, J.

AU - Aoki, K.

AU - Aphecetche, L.

AU - Armendariz, R.

AU - Aronson, S. H.

AU - Averbeck, R.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Baldisseri, A.

AU - Barish, K. N.

AU - Barnes, P. D.

AU - Bassalleck, B.

AU - Bathe, S.

AU - Batsouli, S.

AU - Baublis, V.

AU - Bauer, F.

AU - Bazilevsky, A.

AU - Belikov, S.

AU - Bennett, R.

AU - Berdnikov, Y.

AU - Bjorndal, M. T.

AU - Boissevain, J. G.

AU - Borel, H.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Brown, D. S.

AU - Bucher, D.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Bunce, G.

AU - Burward-Hoy, J. M.

AU - Butsyk, S.

AU - Campbell, S.

AU - Chai, J. S.

AU - Chernichenko, S.

AU - Chi, C. Y.

AU - Chiba, J.

AU - Chiu, M.

AU - Choi, I. J.

AU - Chujo, T.

AU - Cianciolo, V.

AU - Cleven, C. R.

AU - Cobigo, Y.

AU - Cole, B. A.

AU - Comets, M. P.

AU - Connors, M.

AU - Constantin, P.

AU - Csanád, M.

AU - Csörgo, T.

AU - Dahms, T.

AU - Das, K.

AU - David, G.

AU - Delagrange, H.

AU - Denisov, A.

AU - D'Enterria, D.

AU - Deshpande, A.

AU - Desmond, E. J.

AU - Dietzsch, O.

AU - Dion, A.

AU - Drachenberg, J. L.

AU - Drapier, O.

AU - Drees, A.

AU - Dubey, A. K.

AU - Durum, A.

AU - Dzhordzhadze, V.

AU - Efremenko, Y. V.

AU - Egdemir, J.

AU - Enokizono, A.

AU - En'Yo, H.

AU - Espagnon, B.

AU - Esumi, S.

AU - Fields, D. E.

AU - Fleuret, F.

AU - Fokin, S. L.

AU - Forestier, B.

AU - Fraenkel, Z.

AU - Frantz, J. E.

AU - Franz, A.

AU - Frawley, A. D.

AU - Fukao, Y.

AU - Fung, S. Y.

AU - Gadrat, S.

AU - Gastineau, F.

AU - Germain, M.

AU - Glenn, A.

AU - Gonin, M.

AU - Gosset, J.

AU - Goto, Y.

AU - Granier De Cassagnac, R.

AU - Grau, N.

AU - Greene, S. V.

AU - Grosse Perdekamp, M.

AU - Gunji, T.

AU - Gustafsson, H. A.

AU - Hachiya, T.

AU - Hadj Henni, A.

AU - Haggerty, J. S.

AU - Hagiwara, M. N.

AU - Hamagaki, H.

AU - Harada, H.

AU - Hartouni, E. P.

AU - Haruna, K.

AU - Harvey, M.

AU - Haslum, E.

AU - Hasuko, K.

AU - Hayano, R.

AU - He, X.

AU - Heffner, M.

AU - Hemmick, T. K.

AU - Heuser, J. M.

AU - Hiejima, H.

AU - Hill, J. C.

AU - Hobbs, R.

AU - Holmes, M.

AU - Holzmann, W.

AU - Homma, K.

AU - Hong, B.

AU - Horaguchi, T.

AU - Hur, M. G.

AU - Ichihara, T.

AU - Iinuma, H.

AU - Imai, K.

AU - Imrek, J.

AU - Inaba, M.

AU - Isenhower, D.

AU - Isenhower, L.

AU - Ishihara, M.

AU - Isobe, T.

AU - Issah, M.

AU - Isupov, A.

AU - Jacak, B. V.

AU - Jia, J.

AU - Jin, J.

AU - Jinnouchi, O.

AU - Johnson, B. M.

AU - Joo, K. S.

AU - Jouan, D.

AU - Kajihara, F.

AU - Kametani, S.

AU - Kamihara, N.

AU - Kaneta, M.

AU - Kang, J. H.

AU - Kawagishi, T.

AU - Kazantsev, A. V.

AU - Kelly, S.

AU - Khanzadeev, A.

AU - Kim, D. J.

AU - Kim, E.

AU - Kim, Y. S.

AU - Kinney, E.

AU - Kiss, A.

AU - Kistenev, E.

AU - Kiyomichi, A.

AU - Klein-Boesing, C.

AU - Kochenda, L.

AU - Kochetkov, V.

AU - Komkov, B.

AU - Konno, M.

AU - Kotchetkov, D.

AU - Kozlov, A.

AU - Kroon, P. J.

AU - Kunde, G. J.

AU - Kurihara, N.

AU - Kurita, K.

AU - Kweon, M. J.

AU - Kwon, Y.

AU - Kyle, G. S.

AU - Lacey, R.

AU - Lajoie, J. G.

AU - Lebedev, A.

AU - Le Bornec, Y.

AU - Leckey, S.

AU - Lee, D. M.

AU - Lee, M. K.

AU - Leitch, M. J.

AU - Leite, M. A.L.

AU - Li, X. H.

AU - Lim, H.

AU - Litvinenko, A.

AU - Liu, M. X.

AU - Maguire, C. F.

AU - Makdisi, Y. I.

AU - Malakhov, A.

AU - Malik, M. D.

AU - Manko, V. I.

AU - Masui, H.

AU - Matathias, F.

AU - McCain, M. C.

AU - McGaughey, P. L.

AU - Miake, Y.

AU - Miller, T. E.

AU - Milov, A.

AU - Mioduszewski, S.

AU - Mishra, G. C.

AU - Mitchell, J. T.

AU - Morrison, D. P.

AU - Moss, J. M.

AU - Moukhanova, T. V.

AU - Mukhopadhyay, D.

AU - Murata, J.

AU - Nagamiya, S.

AU - Nagata, Y.

AU - Nagle, J. L.

AU - Naglis, M.

AU - Nakamura, T.

AU - Newby, J.

AU - Nguyen, M.

AU - Norman, B. E.

AU - Nyanin, A. S.

AU - Nystrand, J.

AU - O'Brien, E.

AU - Ogilvie, C. A.

AU - Ohnishi, H.

AU - Ojha, I. D.

AU - Okada, K.

AU - Omiwade, O. O.

AU - Oskarsson, A.

AU - Otterlund, I.

AU - Ozawa, K.

AU - Pak, R.

AU - Pal, D.

AU - Palounek, A. P.T.

AU - Pantuev, V.

AU - Papavassiliou, V.

AU - Park, J.

AU - Park, W. J.

AU - Pate, S. F.

AU - Pei, H.

AU - Peng, J. C.

AU - Pereira, H.

AU - Peresedov, V.

AU - Peressounko, D. Yu

AU - Pinkenburg, C.

AU - Pisani, R. P.

AU - Purschke, M. L.

AU - Purwar, A. K.

AU - Qu, H.

AU - Rak, J.

AU - Ravinovich, I.

AU - Read, K. F.

AU - Reuter, M.

AU - Reygers, K.

AU - Riabov, V.

AU - Riabov, Y.

AU - Roche, G.

AU - Romana, A.

AU - Rosati, M.

AU - Rosendahl, S. S.E.

AU - Rosnet, P.

AU - Rukoyatkin, P.

AU - Rykov, V. L.

AU - Ryu, S. S.

AU - Sahlmueller, B.

AU - Saito, N.

AU - Sakaguchi, T.

AU - Sakai, S.

AU - Samsonov, V.

AU - Sato, H. D.

AU - Sato, S.

AU - Sawada, S.

AU - Semenov, V.

AU - Seto, R.

AU - Sharma, D.

AU - Shea, T. K.

AU - Shein, I.

AU - Shibata, T. A.

AU - Shigaki, K.

AU - Shimomura, M.

AU - Shohjoh, T.

AU - Shoji, K.

AU - Sickles, A.

AU - Silva, C. L.

AU - Silvermyr, D.

AU - Sim, K. S.

AU - Singh, C. P.

AU - Singh, V.

AU - Skutnik, S.

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PY - 2012/10/9

Y1 - 2012/10/9

N2 - We report the measurement of direct photons at midrapidity in Au+Au collisions at √s NN=200GeV. The direct photon signal was extracted for the transverse momentum range of 4GeV/cT<22GeV/ c, using a statistical method to subtract decay photons from the inclusive photon sample. 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. R AA was found to be consistent with unity for all centralities over the entire measured p T range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.

AB - We report the measurement of direct photons at midrapidity in Au+Au collisions at √s NN=200GeV. The direct photon signal was extracted for the transverse momentum range of 4GeV/cT<22GeV/ c, using a statistical method to subtract decay photons from the inclusive photon sample. 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. R AA was found to be consistent with unity for all centralities over the entire measured p T range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.

UR - http://www.scopus.com/inward/record.url?scp=84867370476&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84867370476&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.109.152302

DO - 10.1103/PhysRevLett.109.152302

M3 - Article

AN - SCOPUS:84867370476

VL - 109

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 15

M1 - 152302

ER -