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1. Event structure and double helicity asymmetry in jet production from polarizedp+pcollisions ats=200 GeV

Author

Maya Hachiya Shimomura, J. H. Kang, J. S. Haggerty, A. Romana, R. Pak, N. Kamihara, Y. I. Makdisi, Y. Nakamiya, G. Baksay, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. L. Charvet, J. Kubart, E. H. Kim, Y. S. Lai, M. J. Tannenbaum, T. E. Miller, D. Mukhopadhyay, R. A. Soltz, John Hill, C. A. Ogilvie, Herve Borel, D. Lynch, S. Rembeczki, X. He, O. O. Omiwade, T. K. Hemmick, M. Grosse Perdekamp, S. P. Sorensen, H. A. Torii, Yasuo Miake, Dylan Walker, Toru Sugitate, L. D. Isenhower, J. Gosset, P. Chung, V. Peresedov, L. Kochenda, S. Yokkaichi, M. Rosati, J. G. Boissevain, Masashi Kaneta, V. L. Rykov, T. Dahms, Charles Maguire, S. Butsyk, A. Kiss, Vladimir Samsonov, L. Aphecetche, C. Pinkenburg, W. S. Emam, H. Kanou, M. Stepanov, G. Roche, Taku Gunji, H. Gong, J. Seele, R. Vértesi, A. V. Kazantsev, F. Kajihara, Z. Yasin, Henner Buesching, S. Batsouli, H. Masui, A. K. Dubey, H. Delagrange, J. Chiba, N. N. Ajitanand, A. A. Bickley, K. Dehmelt, C. R. Cleven, C. Haegemann, Y. Inoue, A. A. Vinogradov, S. Afanasiev, François Fleuret, B. Love, Marcus Hohlmann, V. S. Pantuev, S. Zhou, J. G. Lajoie, T. Hachiya, I. J. Choi, A. Kravitz, D. Winter, D. Yu Peressounko, S. F. Pate, A. Ster, J. Egdemir, Jason Kamin, Jiangyong Jia, Y. Goto, Kiyoshi Tanida, E. Kistenev, J. T. Mitchell, A. G. Litvinenko, R. Seidl, Vladislav Manko, P. MikeÅ, Takao Sakaguchi, Dong-Hun Kim, M. Slunečka, Y. L. Yamaguchi, B. Komkov, Johannes Peter Wessels, S. N. White, Tamas Ferenc Csorgo, A. Hadj Henni, J. L. Nagle, M. Gonin, Jen-Chieh Peng, Jan Rak, R. Lacey, P. Tarján, H. Al-Bataineh, Takahiro Nakamura, S. P. Stoll, J. Newby, O. Zaudtke, S. Belikov, C. Klein-Boesing, Junji Tojo, Mate Csanad, K. Boyle, M. Ouchida, Norio Saito, C. Silvestre, M. A. L. Leite, H. Harada, H. Pereira, K. Nakano, J. Asai, A. Kozlov, M. Virius, R. Seto, N. Grau, Wei Xie, R. Granier de Cassagnac, A. Adare, D. Hornback, Xiong Wang, C. Vale, B. S. Chang, J. E. Frantz, K. Haruna, A. Taranenko, S. S.E. Rosendahl, Susumu Oda, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, T. A. Shibata, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, Kazushi Miki, W. E. Sondheim, K. Okada, Senta Greene, Dong Jo Kim, M. B. Deaton, Y. Tanaka, Hiroaki Ohnishi, V. Papavassiliou, Sébastien Gadrat, Christine Angela Aidala, J. Klay, B. Sahlmueller, H. En'yo, D. Isenhower, A. Toia, P. A. Rukoyatkin, T. Ichihara, Osamu Jinnouchi, A. D. Frawley, T. Tabaru, S. H. Aronson, Shingo Sakai, T. L. Thomas, Alexei Khanzadeev, E. Stenlund, H. Sakata, S. Takagi, B. E. Norman, K. N. Barish, E. O'Brien, Matthew G. Reuter, Takahiro Fusayasu, F. Matathias, K. Das, E. P. Hartouni, M. J. Leitch, A. Durum, K. Shoji, Ryugo S. Hayano, K. O. Eyser, A. K. Purwar, K. Fujiwara, Kensuke Homma, P. W. Stankus, Sergey Fokin, T. C. Awes, Y. Riabov, Kyoichiro Ozawa, Kenta Shigaki, F. Staley, L. Baksay, Rushan Han, V. Babintsev, T. Horaguchi, Jun Kikuchi, Eva Haslum, B. Lenzi, Alexander Malakhov, D. Silvermyr, Alexander Milov, A. Glenn, I. Ravinovich, M. Nguyen, I. Nakagawa, P. Constantin, Steven E. Skutnik, W. Holzmann, H. Pei, M. Mitrovski, L. S. Zolin, W. J. Park, David D'Enterria, A. S. Nyanin, S. Chernichenko, Rachid Nouicer, M. Issah, Y. Nagata, O. Drapier, Frank Ellinghaus, G. S. Kyle, O. Dietzsch, K. S. Sim, V. Dzhordzhadze, E. R. Kinney, E. T. Atomssa, M. K. Lee, Y. Kwon, Xingguo Li, D. P. Morrison, S. Campbell, B. Bassalleck, C. L. Woody, M. Wysocki, H. W. Van Hecke, H. Valle, M. D. Malik, L. TomáÅek, P. D. Barnes, E. Vznuzdaev, A. Yanovich, H. Qu, D. E. Fields, James Alexander, B. V. Jacak, V. E. Semenov, M. Konno, J. Zimányi, H. Hiejima, Tatsuya Chujo, I. Tserruya, R. Averbeck, Robert F. Hobbs, Byung-Sik Hong, T. V. Moukhanova, Yu. Efremenko, S. Bathe, H. Iinuma, V. Singh, Agneta Oskarsson, A. Bazilevsky, Minghui Liu, Hideki Hamagaki, K. Aoki, Julia Velkovska, Y. Berdnikov, G. David, A. P.T. Palounek, M. McCumber, M. N. Wagner, Philippe Rosnet, Y. Akiba, M. Mishra, S. Nagamiya, I. V. Sourikova, E. J. Desmond, Y. Fukao, A. Shevel, Debashish Pal, M. L. Brooks, K. Imai, S. Sawada, Vaclav Vrba, Klaus Johannes Reygers, T. Hester, J. Ying, A. Franz, Alexandre Lebedev, H. A. Gustafsson, M. Togawa, C. Zhang, D. M. Lee, J. Park, V-N. Tram, M. Heffner, Anne Marie Sickles, Kenneth Francis Read, Motoi Inaba, Viktor Riabov, Y. Tsuchimoto, I. E. Yushmanov, G. R. Young, Tadaaki Isobe, R. Bennett, P. L. McGaughey, M. Chiu, M. Finger, B. Azmoun, A. Král, M. J. Kweon, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, K. S. Joo, T. LiÅka, S. Esumi, D. Sharma, Tae-Yeon Lee, Martin Purschke, D. Kotchetkov, A. Morreale, Z. Fraenkel, G. Bunce, A. Churyn, D. Jouan, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, D. Kawall, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, Alberto Baldisseri, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, L. MaÅek, Saskia Mioduszewski, J. Jin, E. M. Takagui, R. S. Towell, I. Garishvili, Akio Kiyomichi, N. Kurihara, C. Y. Chi, Y. J. Mao, and S. Kametani

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, media_common.quotation_subject, Lambda, 01 natural sciences, 7. Clean energy, Helicity, Asymmetry, Charged particle, Gluon, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Event generator, media_common
Abstract

We report on the event structure and double helicity asymmetry (A(LL)) of jet production in longitudinally polarized p + p collisions at root s = 200 GeV. Photons and charged particles were measured by the PHENIX experiment at midrapidity vertical bar eta vertical bar 2 GeV/c) photon in the event. Event structure, such as multiplicity, p(T) density and thrust in the PHENIX acceptance, were measured and compared with the results from the PYTHIA event generator and the GEANT detector simulation. The shape of jets and the underlying event were well reproduced at this collision energy. For the measurement of jet A(LL), photons and charged particles were clustered with a seed-cone algorithm to obtain the cluster pT sum (p(T)(reco)). The effect of detector response and the underlying events on p(T)(reco) was evaluated with the simulation. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order and perturbative quantum chromodynamics jet production cross section. For 4 = 49% we measured Lambda(LL) = -0.0014 +/- 0.0037(stat) at the lowest p(T)(reco) bin (4-5 GeV= c) and -0.0181 +/- 0.0282(stat) at the highest p(T)(reco) bin (10-12 GeV= c) with a beam polarization scale error of 9.4% and a pT scale error of 10%. Jets in the measured p(T)(reco) range arise primarily from hard-scattered gluons with momentum fraction 0: 02 < x < 0: 3 according to PYTHIA. The measured A(LL) is compared with predictions that assume various Delta G(x) distributions based on the Gluck-Reya-Stratmann-Vogelsang parameterization. The present result imposes the limit -a.1 < integral(0.3)(0.02) dx Delta G(x, mu(2) = GeV2) < 0.4 at 95% confidence level or integral(0.3)(0.002) dx Delta G(x, mu(2) = 1 GeV2) < 0.5 at 99% confidence level.

Published
2011

2. Measurement of neutral mesons inp+pcollisions ats=200 GeVand scaling properties of hadron production

Author

X. He, O. O. Omiwade, L. Aphecetche, K. Sakashita, P. Tarján, V. Peresedov, C. L. Woody, A. Berdnikov, J. Egdemir, Jason Kamin, T. Csörgő, S. P. Stoll, W. A. Zajc, J. Koster, V. S. Pantuev, Senta Greene, V. Baublis, A. Denisov, S. S.E. Rosendahl, Johannes Peter Wessels, V. Cianciolo, Y. Tomita, G. Bunce, A. T. Basye, Maya Hachiya Shimomura, M. Rosati, B. Meredith, Sergey Fokin, I. V. Sourikova, E. H. Kim, B. E. Norman, B. Fadem, E. O'Brien, J. T. Mitchell, A. Churyn, A. V. Kazantsev, S. Batsouli, H. Masui, A. K. Dubey, C. Baumann, Junji Tojo, Anne Marie Sickles, C. P. Singh, D. Jouan, B. M. Johnson, A. Isupov, Y. I. Makdisi, M. B. Deaton, J. Sziklai, Brian Cole, John Hill, R. Seidl, A. A. Bickley, R. A. Soltz, K. Okada, Toru Sugitate, L. D. Isenhower, A. Hadj Henni, M. Grosse Perdekamp, B. Sahlmueller, Y. Tanaka, H. En'yo, G. R. Young, S. Takagi, Vladislav Manko, M. J. Leitch, M. J. Tannenbaum, Beomkyu Kim, K. Boyle, Wei Xie, H. A. Gustafsson, M. Ouchida, M. Slunečka, Mate Csanad, N. Means, J. Asai, K. N. Barish, C. A. Ogilvie, G. S. Kyle, H. Torii, François Fleuret, I. Tserruya, C. Zhang, T. K. Hemmick, James Alexander, Yu. Efremenko, M. Mitrovski, P. Ružička, D. Winter, Yasuo Miake, D. Mukhopadhyay, S. Rembeczki, R. Averbeck, Byung-Sik Hong, K. S. Sim, A. Bazilevsky, T. Ichihara, S. Belikov, L. Tomášek, D. Yu Peressounko, P. Mikeš, A. A. Vinogradov, Viktor Riabov, V. Dzhordzhadze, Y. Kwon, Matthew G. Reuter, Philippe Rosnet, Hiroaki Ohnishi, K. B. Lee, Takahiro Fusayasu, Shingo Sakai, K. A. Drees, T. L. Thomas, F. Staley, L. Baksay, V. Singh, S. Bathe, H. Pei, Alexander Malakhov, L. Kochenda, R. Yang, M. Wysocki, H. Hiejima, M. L. Brooks, H. Iinuma, J. Chiba, Ryugo S. Hayano, Y. Riabov, I. Ravinovich, Takao Sakaguchi, B. Azmoun, A. Král, M. J. Kweon, Agneta Oskarsson, M. K. Lee, Alexandre Lebedev, D. M. Lee, K. Kiriluk, Y. L. Yamaguchi, B. Komkov, Y. Berdnikov, Jiangyong Jia, Y. Goto, B. Love, Robert F. Hobbs, Y. Akiba, C. Klein-Boesing, M. I. Nagy, A. P.T. Palounek, R. Pak, N. Kamihara, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, M. Issah, Kenta Shigaki, M. Nguyen, M. Mishra, S. Nagamiya, A. D. Frawley, T. Tabaru, K. Imai, Norio Saito, M. D. Malik, E. Vznuzdaev, R. Armendariz, M. A. L. Leite, F. Matathias, K. Das, E. P. Hartouni, David D'Enterria, Vaclav Vrba, Klaus Johannes Reygers, A. G. Litvinenko, S. Huang, Kensuke Homma, R. Vértesi, A. S. Nyanin, S. H. Aronson, Kazuyoshi Kurita, T. C. Awes, Kyoichiro Ozawa, T. Liška, Y. Onuki, K. O. Eyser, A. K. Purwar, K. Fujiwara, J. S. Kapustinsky, P. Constantin, S. Chernichenko, D. Roach, Y. Nagata, A. Drees, W. Holzmann, K. M. Kijima, C. R. Cleven, M. Oka, V. Babintsev, Jun Kikuchi, Jan Rak, Rachid Nouicer, B. Bassalleck, C. Haegemann, Y. Inoue, A. Dion, A. Kozlov, J. Kubart, R. Lacey, Ajit Kumar Mohanty, M. Bai, Debashish Pal, M. Konno, R. Seto, K. Haruna, S. Sawada, R. Granier de Cassagnac, T. A. Shibata, A. Adare, T. Sato, J. E. Frantz, Atsushi Taketani, A. Enokizono, Y. Nakamiya, P. Liebing, M. N. Wagner, Y. Fukao, J. Ying, A. Franz, H. W. Van Hecke, A. Shevel, Charles Maguire, Xingguo Li, Alexei Khanzadeev, Tae-Yeon Lee, G. Baksay, K. Dehmelt, E. Stenlund, Martin Purschke, H. Sakata, T. Hester, Kiyoshi Tanida, A. Kiss, O. Dietzsch, Jen-Chieh Peng, E. Kistenev, Z. Yasin, Henner Buesching, E. T. Atomssa, H. Valle, S. P. Sorensen, Dylan Walker, Dipanwita Dutta, D. Isenhower, T. V. Moukhanova, C. M. Camacho, D. Kotchetkov, Marcus Hohlmann, Prashant Shukla, A. Toia, E. J. Desmond, H. Harada, A. Morreale, Julia Velkovska, V-N. Tram, N. Grau, S. F. Pate, Minghui Liu, L. Mašek, Seong H. Kim, D. E. Fields, M. Togawa, J. Park, T. Kempel, Dong-Hun Kim, Xiong Wang, B. V. Jacak, Z. Fraenkel, Motoi Inaba, M. Heffner, J. G. Lajoie, Y. Tsuchimoto, T. Hachiya, R. Bennett, T. Niita, Dong Jo Kim, Osamu Jinnouchi, Kenneth Francis Read, I. E. Yushmanov, H. Al-Bataineh, I. J. Choi, A. Kravitz, M. McCumber, R. K. Choudhury, Tadaaki Isobe, M. Gonin, K. S. Joo, J. L. Charvet, V. Papavassiliou, M. Finger, Sébastien Gadrat, A. Veicht, P. L. McGaughey, A. Sukhanov, H. Pereira, M. Chiu, Y. Morino, T. E. Miller, M. Kurosawa, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, Frank Ellinghaus, S. Esumi, N. N. Ajitanand, E. R. Kinney, Herve Borel, D. P. Morrison, S. Campbell, D. Lynch, D. Sharma, V. E. Semenov, J. Zimányi, R. Ichimiya, Tatsuya Chujo, P. Chung, Eva Haslum, B. Lenzi, Steven E. Skutnik, J. Imrek, V. L. Rykov, T. Dahms, Takahiro Nakamura, S. Dairaku, W. S. Emam, S. Afanasiev, O. Zaudtke, Susumu Oda, A. Ster, H. Kanou, Taku Gunji, H. Gong, J. Seele, M. Virius, F. Kajihara, J. Newby, H. Delagrange, A. Durum, K. Yamaura, S. Zhou, A. Glenn, S. D. Rolnick, D. Hornback, H. Qu, A. Taranenko, Kazushi Miki, Hideki Hamagaki, K. Aoki, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, G. David, Brajesh K. Singh, H. Liu, S. N. White, K. Shoji, Zvi Hirsh Citron, K. Nakano, P. W. Stankus, W. E. Sondheim, D. Ivanischev, Saskia Mioduszewski, P. A. Rukoyatkin, J. Jin, E. M. Takagui, R. S. Towell, I. Garishvili, Akio Kiyomichi, F. Wei, N. Kurihara, C. Y. Chi, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, C. Pinkenburg, M. Stepanov, G. Roche, Y. J. Mao, S. Kametani, T. Horaguchi, J. H. Kang, J. S. Haggerty, A. Romana, Y. S. Lai, A. Yu. Semenov, J. Gosset, S. Butsyk, Vladimir Samsonov, S. Yokkaichi, J. L. Nagle, C. Silvestre, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, R. Tanabe, D. Layton, W. C. Chang, Rushan Han, D. Kawall, H. Themann, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Alberto Baldisseri, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, A. Deshpande, Y. Watanabe, I. Younus, and A. Soldatov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Omega baryon, 01 natural sciences, 7. Clean energy, Omega, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, Tsallis distribution, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the invariant differential cross section for production of K-S(0), omega, eta', and phi mesons in p + p collisions at root s 200 GeV. Measurements of omega and phi production in different decay channels give consistent results. New results for the omega are in agreement with previously published data and extend the measured p(T) coverage. The spectral shapes of all hadron transverse momentum distributions measured by PHENIX are well described by a Tsallis distribution functional form with only two parameters, n and T, determining the high-p(T) and characterizing the low-p(T) regions of the spectra, respectively. The values of these parameters are very similar for all analyzed meson spectra, but with a lower parameter T extracted for protons. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

Published
2011

3. HighpTdirect photon andπ0triggered azimuthal jet correlations and measurement ofkTfor isolated direct photons inp+pcollisions ats=200 GeV

Author

Ajit Kumar Mohanty, P. Tarján, T. A. Shibata, T. Sato, David D'Enterria, S. Bathe, Agneta Oskarsson, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, Frank Ellinghaus, Y. Nakamiya, Y. Berdnikov, Y. Akiba, A. V. Kazantsev, E. R. Kinney, D. P. Morrison, S. Campbell, M. Mishra, D. Isenhower, A. Toia, S. Nagamiya, V. E. Semenov, M. N. Wagner, J. Zimányi, C. Baumann, D. Lynch, Tatsuya Chujo, G. Baksay, L. Tomášlek, C. P. Singh, Tae-Yeon Lee, Martin Purschke, L. Mašek, Vaclav Vrba, Klaus Johannes Reygers, I. Tserruya, Yu. Efremenko, S. Butsyk, Vladimir Samsonov, K. Dehmelt, Jen-Chieh Peng, Senta Greene, B. M. Johnson, Xiong Wang, V. Singh, Dong Jo Kim, G. S. Kyle, Osamu Jinnouchi, A. Veicht, James Alexander, A. Isupov, C. Suire, Y. Fukao, T. Niita, A. Shevel, A. T. Basye, B. E. Norman, Maya Hachiya Shimomura, M. Naglis, C. L. Silva, P. Mikeš, J. Sziklai, Y. J. Mao, J. T. Mitchell, S. Kametani, T. Horaguchi, V. L. Rykov, T. Dahms, R. Averbeck, Byung-Sik Hong, Brian Cole, D. Kotchetkov, T. Hester, B. Fadem, I. Ravinovich, Y. I. Makdisi, E. O'Brien, A. Bazilevsky, R. Seidl, J. L. Charvet, Vladislav Manko, M. Slunečka, M. Mitrovski, Philippe Rosnet, B. Love, R. S. Towell, A. Morreale, I. Garishvili, Akio Kiyomichi, F. Wei, Masayasu Ishihara, Y. Nagata, K. O. Eyser, A. K. Purwar, M. Bai, K. Fujiwara, Z. Fraenkel, S. Belikov, Tamas Ferenc Csorgo, R. A. Soltz, H. Borel, E. J. Desmond, T. C. Awes, Kyoichiro Ozawa, T. Liška, T. E. Miller, M. Kurosawa, Jun Kikuchi, H. Iinuma, Alexandre Lebedev, O. Dietzsch, N. Kurihara, E. T. Atomssa, M. J. Tannenbaum, A. G. Litvinenko, D. M. Lee, C. Vale, B. S. Chang, J. L. Nagle, M. Togawa, K. S. Sim, V. Dzhordzhadze, M. Grosse Perdekamp, H. Torii, J. Park, Christine Angela Aidala, R. K. Choudhury, J. Klay, Y. Kwon, H. Valle, Susumu Sato, C. Y. Chi, V-N. Tram, N. Grau, Dipanwita Dutta, Tadaaki Isobe, A. P.T. Palounek, C. A. Ogilvie, K. S. Joo, M. E. Connors, P. Chung, R. Yang, R. Bennett, J. H. Kang, J. S. Haggerty, A. Romana, D. Mukhopadhyay, A. Kozlov, S. Rembeczki, J. Imrek, H. Hiejima, C. L. Woody, A. Berdnikov, K. A. Drees, F. Staley, K. Kiriluk, T. K. Hemmick, M. Wysocki, S. Taneja, R. Seto, K. Haruna, Y. Tsuchimoto, F. Matathias, Saskia Mioduszewski, M. Finger, H. A. Gustafsson, H. W. Van Hecke, Yasuo Miake, P. L. McGaughey, Eva Haslum, J. Chiba, W. S. Emam, M. K. Lee, B. Lenzi, H. Liu, Kensuke Homma, K. Imai, K. Shoji, Motoi Inaba, Julia Velkovska, I. E. Yushmanov, M. Chiu, M. Rosati, P. Constantin, S. Chernichenko, E. H. Kim, S. Dairaku, X. He, O. O. Omiwade, C. Zhang, Alexei Khanzadeev, H. Kanou, Taku Gunji, H. Gong, J. Seele, O. Zaudtke, D. Sharma, D. Winter, D. Kawall, S. Afanasiev, P. W. Stankus, L. Kochenda, B. Bassalleck, A. Ster, H. Themann, J. Jin, M. Konno, V. Peresedov, E. Stenlund, H. Sakata, E. M. Takagui, Takao Sakaguchi, R. Ichimiya, P. Ružička, D. Yu Peressounko, A. Kiss, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, C. Klein-Boesing, J. Newby, J. Koster, F. Kajihara, H. Delagrange, Anne Marie Sickles, M. Virius, B. Azmoun, A. Král, M. J. Kweon, K. Sakashita, A. D. Frawley, T. Tabaru, Robert F. Hobbs, Andry Malala Rakotozafindrabe, Viktor Riabov, Y. S. Lai, S. Batsouli, H. Masui, A. K. Dubey, Z. Yasin, Henner Buesching, V. I. Kochetkov, S. Huang, S. H. Aronson, A. A. Bickley, R. Tanabe, D. Layton, V. S. Pantuev, J. Murata, I. V. Sourikova, J. Egdemir, D. Hornback, Minghui Liu, A. A. Vinogradov, S. Takagi, Jason Kamin, S. Esumi, M. Heffner, S. Zhou, W. Holzmann, K. N. Barish, A. Baldisseri, S. D. Rolnick, M. Oka, C. R. Cleven, G. R. Young, C. Haegemann, Y. Inoue, Junji Tojo, S. P. Stoll, Kenneth Francis Read, A. Taranenko, Jiangyong Jia, Y. Goto, Y. L. Yamaguchi, B. Komkov, A. Dion, T. V. Moukhanova, Gerd Joachim Kunde, I. Shein, W. C. Chang, W. A. Zajc, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, A. Glenn, Kazushi Miki, V. Baublis, A. Denisov, V. Cianciolo, K. Das, R. Vértesi, Y. Onuki, Atsushi Taketani, Marcus Hohlmann, Brajesh K. Singh, S. S.E. Rosendahl, G. Bunce, A. Enokizono, M. Ouchida, T. Kempel, Dong-Hun Kim, K. Sedgwick, P. Liebing, Norio Saito, T. Ichihara, M. A. L. Leite, A. Deshpande, Y. Tomita, Jan Rak, Sergey Fokin, M. L. Brooks, Rushan Han, K. Okada, E. P. Hartouni, R. Lacey, N. Means, J. Asai, B. Sahlmueller, A. Churyn, D. Jouan, Debashish Pal, C. Pinkenburg, R. Granier de Cassagnac, A. Adare, J. E. Frantz, H. En'yo, M. J. Leitch, Steven E. Skutnik, R. Pak, N. Kamihara, S. Sawada, Y. Watanabe, J. S. Kapustinsky, M. Stepanov, G. Roche, A. Yu. Semenov, V. Babintsev, I. Younus, Shingo Sakai, T. L. Thomas, R. Armendariz, J. Ying, A. Franz, H. Qu, Kazuyoshi Kurita, A. Soldatov, J. Gosset, Matthew G. Reuter, A. Drees, Takahiro Fusayasu, J. Kubart, Ryugo S. Hayano, Hideki Hamagaki, K. Aoki, G. David, Y. Riabov, Kenta Shigaki, S. Yokkaichi, M. Nguyen, A. S. Nyanin, Rachid Nouicer, Alexander Malakhov, C. M. Camacho, Prashant Shukla, S. F. Pate, D. Silvermyr, H. Al-Bataineh, L. S. Zolin, W. J. Park, V. Papavassiliou, Sébastien Gadrat, P. D. Barnes, A. Yanovich, S. N. White, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, P. A. Rukoyatkin, B. Meredith, John Hill, Toru Sugitate, L. D. Isenhower, François Fleuret, Hiroaki Ohnishi, K. B. Lee, D. Roach, K. M. Kijima, Xingguo Li, M. Gonin, A. Sukhanov, H. Pereira, Y. Morino, D. E. Fields, B. V. Jacak, M. B. Deaton, Y. Tanaka, M. McCumber, A. Hadj Henni, S. P. Sorensen, Dylan Walker, Beomkyu Kim, K. Boyle, Seong H. Kim, Wei Xie, J. G. Lajoie, T. Hachiya, N. N. Ajitanand, L. Baksay, I. J. Choi, A. Kravitz, Takahiro Nakamura, Charles Maguire, Susumu Oda, A. Durum, Catherine Micaela Silvestre, K. Yamaura, Kiyoshi Tanida, E. Kistenev, H. Harada, H. Pei, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, L. Aphecetche, Johannes Peter Wessels, and Mate Csanad

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Photon, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Compton scattering, Elementary particle, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

Correlations of charged hadrons of 1< p(T) < 10 Gev/c with high pT direct photons and pi(0) mesons in the range 5< p(T) < 15 Gev/c are used to study jet fragmentation in the gamma + jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k(T), is obtained by comparing to a model incorporating a Gaussian kT smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.

Published
2010

4. Double-helicity dependence of jet properties from dihadrons in longitudinally polarizedp+pcollisions ats=200 GeV

Author

J. Chiba, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, David D'Enterria, Takao Sakaguchi, C. Klein-Boesing, B. Azmoun, M. B. Deaton, A. Král, M. J. Kweon, C. Pinkenburg, A. D. Frawley, T. Tabaru, A. Kiss, I. Tserruya, Tadaaki Isobe, D. E. Fields, Y. Onuki, Y. Tanaka, Yu. Efremenko, S. Huang, Jan Rak, M. Stepanov, R. Lacey, G. Roche, S. P. Sorensen, Robert F. Hobbs, V. Singh, R. Granier de Cassagnac, S. H. Aronson, A. Adare, M. N. Wagner, Z. Yasin, P. L. McGaughey, B. V. Jacak, W. Holzmann, M. Oka, Dylan Walker, M. Chiu, Henner Buesching, K. A. Drees, Y. J. Mao, A. Dion, K. S. Sim, Y. Nakamiya, V. Dzhordzhadze, S. Kametani, T. Horaguchi, Y. Kwon, R. Yang, H. Hiejima, M. McCumber, Anne Marie Sickles, K. Imai, Seong H. Kim, M. Ouchida, N. Means, J. Asai, Debashish Pal, S. Sawada, J. H. Kang, J. S. Haggerty, G. R. Young, Marcus Hohlmann, F. Staley, L. Baksay, J. G. Lajoie, G. Baksay, A. Romana, Atsushi Taketani, A. Enokizono, P. Liebing, T. Hachiya, J. Ying, A. Franz, A. V. Kazantsev, C. R. Cleven, Ajit Kumar Mohanty, C. Haegemann, Y. Inoue, T. A. Shibata, Alexander Milov, I. Nakagawa, Maya Hachiya Shimomura, Y. I. Makdisi, Shingo Sakai, T. Engelmore, T. Sato, R. A. Soltz, Y. Fukao, Tae-Yeon Lee, A. Shevel, Martin Purschke, C. M. Camacho, Prashant Shukla, L. Tomášek, P. Mikeš, R. Pak, W. A. Zajc, C. Silvestre, T. Hester, T. Kempel, Dong-Hun Kim, O. Drapier, Frank Ellinghaus, E. R. Kinney, I. J. Choi, D. P. Morrison, S. Campbell, A. Kravitz, H. Pei, S. F. Pate, R. Vértesi, N. Kamihara, Marisilvia Donadelli, D. Isenhower, A. Toia, V. E. Semenov, D. Kotchetkov, J. Zimányi, V. Baublis, R. Armendariz, O. Dietzsch, A. Denisov, E. T. Atomssa, H. Valle, Y. S. Lai, V. Bumazhnov, M. P. Comets, Tatsuya Chujo, V. Cianciolo, M. J. Tannenbaum, T. C. Awes, Kyoichiro Ozawa, T. Liška, X. He, O. O. Omiwade, H. Al-Bataineh, Hiroaki Ohnishi, K. B. Lee, A. Yu. Semenov, L. Mašek, A. Morreale, M. Grosse Perdekamp, Andry Malala Rakotozafindrabe, L. Aphecetche, K. O. Eyser, A. K. Purwar, K. Fujiwara, H. Torii, C. L. Woody, A. Berdnikov, J. Gosset, J. T. Mitchell, Y. Tomita, Jun Kikuchi, Kazuyoshi Kurita, A. Drees, V-N. Tram, N. Grau, Dipanwita Dutta, N. N. Ajitanand, T. Niita, D. Mukhopadhyay, Sergey Fokin, S. Rembeczki, K. Dehmelt, R. Tanabe, D. Layton, Z. Fraenkel, Jen-Chieh Peng, R. Seidl, Vladislav Manko, K. Das, Minghui Liu, J. L. Charvet, J. Kubart, J. E. Frantz, V. Papavassiliou, K. Sakashita, Motoi Inaba, V. Peresedov, Julia Velkovska, Sébastien Gadrat, Takahiro Nakamura, M. Slunečka, H. Liu, M. K. Lee, R. K. Choudhury, Xiong Wang, Eva Haslum, Dong Jo Kim, E. P. Hartouni, B. Lenzi, Kenneth Francis Read, T. E. Miller, M. Kurosawa, J. Egdemir, W. C. Chang, Osamu Jinnouchi, Jason Kamin, E. J. Desmond, D. Roach, S. Yokkaichi, K. M. Kijima, S. Belikov, K. Shoji, M. Mitrovski, Susumu Oda, B. Meredith, H. W. Van Hecke, A. Durum, J. Koster, I. V. Sourikova, Charles Maguire, S. Afanasiev, A. Ster, T. L. Thomas, A. Veicht, S. P. Stoll, M. Rosati, Rushan Han, P. Chung, J. Imrek, M. Togawa, J. Park, V. S. Pantuev, S. Butsyk, Vladimir Samsonov, J. Newby, H. A. Gustafsson, M. Wysocki, S. Bathe, Johannes Peter Wessels, Agneta Oskarsson, Ryugo S. Hayano, S. S.E. Rosendahl, G. Bunce, K. Yamaura, E. Kistenev, Xingguo Li, M. Gonin, W. S. Emam, S. Batsouli, H. Kanou, Y. Tsuchimoto, Y. Riabov, Y. Berdnikov, Y. Akiba, P. W. Stankus, M. Mishra, D. Hornback, A. Churyn, Kenta Shigaki, H. Masui, A. K. Dubey, Taku Gunji, H. Gong, J. Seele, M. Nguyen, M. Heffner, D. Jouan, A. A. Vinogradov, C. Zhang, C. Vale, I. E. Yushmanov, Junji Tojo, F. Kajihara, S. Nagamiya, A. Hadj Henni, Alexei Khanzadeev, Tamas Ferenc Csorgo, H. Harada, J. L. Nagle, Vaclav Vrba, Klaus Johannes Reygers, A. S. Nyanin, A. Taranenko, E. Stenlund, B. S. Chang, Kazushi Miki, Rachid Nouicer, H. Delagrange, Jiangyong Jia, Y. Goto, D. Winter, H. Sakata, D. Yu Peressounko, A. A. Bickley, P. Tarján, A. Sukhanov, K. Okada, H. Pereira, Y. Morino, Christine Angela Aidala, J. Klay, Brajesh K. Singh, C. A. Ogilvie, P. Ružička, T. K. Hemmick, B. Sahlmueller, John Hill, H. En'yo, M. J. Leitch, Beomkyu Kim, K. Boyle, S. Zhou, Yasuo Miake, B. Love, Wei Xie, Steven E. Skutnik, T. V. Moukhanova, S. D. Rolnick, L. Kochenda, Viktor Riabov, A. G. Litvinenko, F. Matathias, Toru Sugitate, L. D. Isenhower, Senta Greene, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, A. Kozlov, R. Seto, K. Haruna, A. T. Basye, Kensuke Homma, B. E. Norman, B. Fadem, H. Qu, S. Takagi, E. O'Brien, K. N. Barish, P. Constantin, S. Chernichenko, Hideki Hamagaki, K. Aoki, M. L. Brooks, G. David, François Fleuret, B. Bassalleck, H. Iinuma, T. Ichihara, M. Konno, Matthew G. Reuter, Takahiro Fusayasu, A. P.T. Palounek, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, S. N. White, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, P. A. Rukoyatkin, E. H. Kim, I. Ravinovich, Y. Nagata, Y. L. Yamaguchi, M. Bai, B. Komkov, E. C. Aschenauer, Norio Saito, M. A. L. Leite, R. Bennett, J. S. Kapustinsky, M. Finger, S. Dairaku, V. Babintsev, O. Zaudtke, G. S. Kyle, James Alexander, M. Virius, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Philippe Rosnet, A. Glenn, Alexandre Lebedev, D. M. Lee, Herve Borel, D. Lynch, K. Kiriluk, V. L. Rykov, T. Dahms, K. S. Joo, S. Esumi, D. Sharma, Saskia Mioduszewski, R. Ichimiya, J. Jin, E. M. Takagui, C. Baumann, M. Naglis, C. P. Singh, C. L. Silva, B. M. Johnson, A. Isupov, C. Suire, Masayasu Ishihara, J. Sziklai, Susumu Sato, Brian Cole, R. S. Towell, I. Garishvili, Akio Kiyomichi, F. Wei, A. Deshpande, N. Kurihara, C. Y. Chi, Y. Watanabe, I. Younus, A. Soldatov, D. Kawall, K. Tanida, H. Themann, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Alberto Baldisseri, and Mate Csanad

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Drell–Yan process, 01 natural sciences, Helicity, Baryon, Nuclear physics, Total angular momentum quantum number, 0103 physical sciences, Proton spin crisis, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Spin (physics)
Abstract

It has been postulated that partonic orbital angular momentum can lead to a significant double-helicity dependence in the net transverse momentum of Drell-Yan dileptons produced in longitudinally polarized p + p collisions. Analogous effects are also expected for dijet production. If confirmed by experiment, this hypothesis, which is based on semiclassical arguments, could lead to a new approach for studying the contributions of orbital angular momentum to the proton spin. We report the first measurement of the double-helicity dependence of the dijet transverse momentum in longitudinally polarized p + p collisions at root s = 200 GeV from data taken by the PHENIX experiment in 2005 and 2006. The analysis deduces the transverse momentum of the dijet from the widths of the near-and far-side peaks in the azimuthal correlation of the dihadrons. When averaged over the transverse momentum of the triggered particle, the difference of the root mean square of the dijet transverse momentum between like-and unlike-helicity collisions is found to be -37 +/- 88(stat) +/- 14(sys)t MeV/c.

Published
2010

5. Jet properties from dihadron correlations inp+pcollisions ats=200 GeV

Author

N. Grau, K. Tanida, B. D. Fox, V. I. Kochetkov, P. W. Stankus, S. Takagi, K. N. Barish, H. Kobayashi, S. Bathe, Kensuke Homma, Gerd Joachim Kunde, B. M. Johnson, R. A. Soltz, I. Shein, S. S. Adler, G. S. Kyle, T. J. Uam, M. Grosse Perdekamp, N. Willis, James Alexander, S. Chernichenko, H. Lim, M. L. Brooks, Y. Akiba, C. H. Kuberg, K. Das, Alberto Baldisseri, R. Averbeck, B. Bassalleck, Byung-Sik Hong, S. Nagamiya, Brian Cole, Alexei Khanzadeev, A. Bazilevsky, Kazuhiro Tanaka, M. Konno, J. Chiba, A. Pierson, Philippe Rosnet, Klaus Johannes Reygers, N. Bruner, X. He, Alexandre Lebedev, E. P. Hartouni, V. Peresedov, H. Masui, D. M. Lee, G. C. Mishra, Takao Sakaguchi, David Olle Rickard Silvermyr, J. Gosset, J. P. Sullivan, X. Zong, Saskia Mioduszewski, Marie Germain, C. L. Silva, Hiroaki Ohnishi, A. G. Litvinenko, A. Kozlov, R. Seto, J. M. Qualls, E. H. Kim, V. Bumazhnov, M. P. Comets, V. Dzhordzhadze, C. Klein-Boesing, Yves Roland Schutz, A. D. Frawley, J. T. Mitchell, O. Dietzsch, S. C. Johnson, P. L. McGaughey, M. J. Kweon, Masayasu Ishihara, Susumu Sato, D. Pal, Y. Le Bornec, T. Ichihara, F. K. Wohn, R. Kohara, D. E. Fields, S. H. Aronson, Sean A. Kelly, Vladislav Manko, E. M. Takagui, R. S. Towell, B. V. Jacak, Viktor Veszpremi, M. Inuzuka, Hideki Hamagaki, Dipanwita Dutta, Matthew G. Reuter, G. David, Akio Kiyomichi, S. Yokkaichi, J. M. Heuser, I. D. Ojha, Alexander Malakhov, M. Muniruzzaman, F. Staley, A. K. Purwar, W. Holzmann, Maya Hachiya Shimomura, T. Chujo, H. W. Van Hecke, J. E. Frantz, X. Camard, T. L. Thomas, M. Rosati, P. Tarján, W. C. Chang, Xingguo Li, L. S. Zolin, Y. I. Makdisi, E. J. Desmond, M. Velkovsky, J. G. Boissevain, Masashi Kaneta, B. Komkov, A. Kiss, C. Y. Chi, Herve Borel, Christine Angela Aidala, Senta Greene, Jean-Pierre Cussonneau, W. J. Park, A. Glenn, K. Katou, Alexander Milov, S. P. Stoll, M. Togawa, Hans-Åke Gustafsson, Atsushi Taketani, J. M. Burward-Hoy, Roy A. Lacey, Y. Tanaka, T. K. Shea, Norio Saito, P. D. Barnes, A. Yanovich, Henner Buesching, C. L. Woody, J. Park, M. J. Tannenbaum, M. Gonin, B. Khachaturov, A. A. Vinogradov, Henrik Tydesjö, T. Matsumoto, C. Pinkenburg, M. A. L. Leite, V.N. Penev, Florian Bauer, E. O'Brien, V. L. Rykov, Jiangyong Jia, Y. Goto, P. Chand, Ryugo S. Hayano, M. T. Bjorndal, Martin Purschke, N. N. Ajitanand, Anne Marie Sickles, S. Butsyk, Vladimir Samsonov, S. N. White, S. S.E. Rosendahl, G. Bunce, V. V. Ikonnikov, Takahiro Nakamura, Y. Tsuchimoto, D. Bucher, M. Stepanov, G. Roche, Y. J. Mao, K. Hasuko, K. Kurita, S. Kametani, Y. J. Kwon, D. Kotchetkov, I. E. Yushmanov, Z. Fraenkel, L. Sanfratello, Tamas Ferenc Csorgo, W. E. Sondheim, Minghui Liu, Y. Riabov, Pàl Hidas, J. H. Kang, J. S. Haggerty, A. Romana, P. J. Kroon, Kenta Shigaki, V. Babintsev, Hiroyuki Okada, Joakim Nystrand, A. Durum, J. L. Nagle, G. R. Young, R. K. Choudhury, S. Belikov, K. S. Joo, H. Pereira, S. Y. Fung, D. S. Brown, J. L. Drachenberg, Y. Watanabe, D. Jouan, Charles Maguire, S. Leckey, D. Mukhopadhyay, K. Ozawa, S. Esumi, Y. Cobigo, A. S. Nyanin, O. Drapier, E. R. Kinney, D. P. Morrison, I. Ravinovich, Anders Nils Erik Oskarsson, Kenneth Francis Read, S. P. Sorensen, John Hill, K. Oyama, A. V. Kazantsev, Ferenc Deák, N. Kamihara, Ch. Finck, S. Afanasiev, Jason Newby, A. Ster, Josh Moss, Toru Sugitate, L. D. Isenhower, A. Isupov, A. Soldatov, F. Matathias, R. Armendariz, V. E. Semenov, S. S. Ryu, V. S. Pantuev, E. Kistenev, François Fleuret, M. Harvey, J. G. Lajoie, T. Hachiya, K. S. Sim, Junji Tojo, Ahmed Al-Jamel, J. Zimányi, A. Drees, L. Aphecetche, W. A. Zajc, Ingvar Otterlund, K. Okada, I. J. Choi, H. Pei, H. En'yo, P. Constantin, M. A. Volkov, Takeo Kawabata, M. C. McCain, M. J. Leitch, V. Baublis, K. Aoki, M. Heffner, C. A. Ogilvie, T. K. Hemmick, H. Hiejima, Yoichiro Fukao, H. J. Kim, Yasuo Miake, A. Taranenko, A. Denisov, L. Kochenda, V. Cianciolo, K. Imai, T. C. Awes, Jun Kikuchi, Jen-Chieh Peng, Evert Anders Stenlund, Jan Rak, A. G. Hansen, Shingo Sakai, Sergey Fokin, R. Granier de Cassagnac, T. Horaguchi, A. Hoover, I. V. Sourikova, H. Torii, M. Issah, E. Vznuzdaev, C. Zhang, Wei Xie, A. Deshpande, Viktor Riabov, Dong Jo Kim, Osamu Jinnouchi, S. Batsouli, A. P.T. Palounek, I. Tserruya, Yu. Efremenko, G. B. Kim, Hirohiko Sato, J. Velkovska, M. Chiu, Ajit Kumar Mohanty, T. A. Shibata, D. Isenhower, German Martinez, A. Devismes, F. Kajihara, H. Delagrange, S. Zhou, T. E. Miller, R. Santo, Robert F. Hobbs, S. Sawada, A. Franz, B. Espagnon, S. F. Pate, X. R. Wang, V. Papavassiliou, Sébastien Gadrat, Mate Csanad, David D'Enterria, R. P. Pisani, Nikolay Tyurin, V-N. Tram, and Motoi Inaba

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences, Spectral line
Abstract

The properties of jets produced in p+p collisions at root s=200 GeV are measured using the method of two-particle correlations. The trigger particle is a leading particle from a large transverse momentum jet while the associated particle comes from either the same jet or the away-side jet. Analysis of the angular width of the near-side peak in the correlation function determines the jet-fragmentation transverse momentum j(T). The extracted value, root =585 +/- 6(stat)+/- 15(sys) MeV/c, is constant with respect to the trigger particle transverse momentum, and comparable to the previous lower root s measurements. The width of the away-side peak is shown to be a convolution of j(T) with the fragmentation variable, z, and the partonic transverse momentum, k(T). The is determined through a combined analysis of the measured pi(0) inclusive and associated spectra using jet-fragmentation functions measured in e(+)e(-) collisions. The final extracted values of k(T) are then determined to also be independent of the trigger particle transverse momentum, over the range measured, with value of root =2.68 +/- 0.07(stat)+/- 0.34(sys) GeV/c.

Published
2006

6. Improved measurement of double helicity asymmetry in inclulsive midrapidityπ0production for polarizedp+pcollisions ats=200 GeV

Author

M. Issah, M. D. Malik, E. Vznuzdaev, N. N. Ajitanand, O. Dietzsch, J. G. Boissevain, Masashi Kaneta, Takahiro Nakamura, A. Hadj Henni, T. V. Moukhanova, Ferenc Deák, N. Kamihara, K. Katou, K. Boyle, Wei Xie, H. Valle, Maya Hachiya Shimomura, O. Zaudtke, T. Shohjoh, F. Matathias, R. Armendariz, Kazuyoshi Kurita, A. Durum, Y. Cobigo, A. Drees, J. L. Drachenberg, Y. I. Makdisi, I. Ravinovich, D. S. Brown, C. Pinkenburg, Y. Nagata, A. Isupov, S. S. Ryu, Dipanwita Dutta, Julia Velkovska, M. Stepanov, G. Roche, S. F. Pate, Y. Tanaka, L. Aphecetche, Takeo Kawabata, R. Kohara, C. Zhang, C. R. Cleven, J. Egdemir, D. E. Fields, S. Afanasiev, A. Ster, M. J. Tannenbaum, B. V. Jacak, V. V. Ikonnikov, T. K. Shea, R. Bennett, Ahmed Al-Jamel, A. K. Purwar, S. P. Stoll, Johannes Peter Wessels, D. Mukhopadhyay, D. Bucher, C. H. Kuberg, S. C. Johnson, B. Azmoun, M. J. Kweon, S. S.E. Rosendahl, G. Bunce, J. E. Frantz, A. Glenn, J. Chiba, V. L. Rykov, T. Dahms, J. M. Burward-Hoy, Minghui Liu, G. C. Mishra, D. Jouan, X. R. Wang, P. J. Kroon, I. Tserruya, J. Gosset, J. P. Sullivan, Kenneth Francis Read, Y. Le Bornec, T. Ichihara, Takao Sakaguchi, M. Rosati, M. Velkovsky, C. Klein-Boesing, M. A. Volkov, J. G. Lajoie, A. D. Frawley, T. Tabaru, B. D. Fox, V-N. Tram, T. Hachiya, S. H. Aronson, C. A. Ogilvie, Y. J. Kwon, Tadaaki Isobe, W. Holzmann, I. J. Choi, A. A. Vinogradov, Henrik Tydesjö, Hiroaki Ohnishi, V. Singh, J. S. Chai, S. Yokkaichi, J. M. Heuser, T. K. Hemmick, Yasuo Miake, P. L. McGaughey, W. C. Smith, Sean A. Kelly, F. K. Wohn, Matthew G. Reuter, Motoi Inaba, S. Batsouli, G. B. Kim, Jiangyong Jia, Y. Goto, A. Dion, L. Sanfratello, J. M. Qualls, E. J. Desmond, Y. J. Mao, S. Kametani, A. Kiss, Yuri Efremenko, L. Kochenda, Mate Csanad, M. K. Lee, Pàl Hidas, J. H. Kang, K. Ozawa, Charles Maguire, S. Leckey, Atsushi Taketani, Jean-Pierre Cussonneau, J. S. Haggerty, V. Papavassiliou, Sébastien Gadrat, E. H. Kim, A. Romana, M. Heffner, T. Kawagishi, Steven E. Skutnik, A. V. Kazantsev, V. Bumazhnov, M. P. Comets, M. Togawa, Viktor Veszpremi, Henner Buesching, S. Belikov, K. S. Joo, J. Park, I. D. Ojha, Alexander Malakhov, Josh Moss, A. Taranenko, C. L. Woody, Soren Pontoppidan Sorensen, Xingguo Li, Robert F. Hobbs, H. Qu, Florian Bauer, Yoichiro Fukao, Hirohiko Sato, E. Kistenev, M. Gonin, V.N. Penev, S. K. Tuli, David D'Enterria, M. C. McCain, V. S. Pantuev, M. Inuzuka, Hideki Hamagaki, M. Harvey, L. S. Zolin, D. Sharma, Jun Kikuchi, G. David, W. J. Park, H. Pereira, K. Das, B. Khachaturov, Jen-Chieh Peng, R. P. Pisani, Debashish Pal, H. Harada, P. Chand, S. Sawada, Paul Stankus, Junji Tojo, H. Pei, A. Franz, E. P. Hartouni, Y. Tsuchimoto, Senta Greene, Martin Purschke, F. Gastineau, M. T. Bjorndal, T. Matsumoto, A. P.T. Palounek, K. Hasuko, P. D. Barnes, A. Yanovich, Nikolay Tyurin, B. E. Norman, S. Y. Fung, B. Espagnon, P. Tarján, K. Okada, D. Kotchetkov, E. O'Brien, R. A. Soltz, H. Borel, H. J. Kim, I. V. Sourikova, M. Grosse Perdekamp, H. Torii, N. Grau, W. C. Chang, I. E. Yushmanov, Hiroyuki Okada, M. N. Wagner, Joakim Nystrand, K. Shoji, B. Sahlmueller, H. En'yo, P. Constantin, S. Esumi, John Hill, K. Oyama, Z. Fraenkel, A. Pierson, Dong Jo Kim, Roy A. Lacey, Osamu Jinnouchi, M. N. Hagiwara, Eva Haslum, S. S. Adler, M. J. Leitch, David Olle Rickard Silvermyr, G. S. Kyle, T. L. Thomas, Toru Sugitate, L. D. Isenhower, Alexei Khanzadeev, W. A. Zajc, S. Butsyk, R. K. Choudhury, D. Winter, D. Yu Peressounko, Ryugo S. Hayano, Vladimir Samsonov, I. Otterlund, N. Willis, James Alexander, V. Baublis, K. Aoki, François Fleuret, B. Forestier, N. Bruner, E. Stenlund, A. Denisov, R. Averbeck, Byung-Sik Hong, V. Cianciolo, S. N. White, A. Bazilevsky, Alexander Milov, M. Wysocki, Sergey Fokin, Philippe Rosnet, Y. Riabov, Kenta Shigaki, O. Drapier, M. Nguyen, E. R. Kinney, T. Horaguchi, A. Hoover, D. P. Morrison, W. E. Sondheim, Tamas Ferenc Csorgo, S. Campbell, P. A. Rukoyatkin, H. A. Gustafsson, J. L. Nagle, V. E. Semenov, J. Zimányi, Alexandre Lebedev, Tatsuya Chujo, D. M. Lee, Kensuke Homma, Viktor Riabov, A. S. Nyanin, Xiaopeng Zong, S. Chernichenko, H. Lim, B. Komkov, B. Bassalleck, Norio Saito, M. A. L. Leite, M. Konno, H. W. Van Hecke, R. Vértesi, J. T. Mitchell, V. Babintsev, A. G. Hansen, Shingo Sakai, Vladislav Manko, H. Kobayashi, S. Bathe, Terry C Awes, Ch. Finck, Jason Newby, Agneta Oskarsson, X. Camard, Y. Berdnikov, Christine Angela Aidala, Y. Akiba, S. Nagamiya, Kazuhiro Tanaka, Klaus Johannes Reygers, K. S. Sim, H. Hiejima, K. Imai, T. E. Miller, R. Santo, A. Enokizono, M. Holmes, Anne Marie Sickles, M. Chiu, Ajit Kumar Mohanty, T. A. Shibata, D. Isenhower, German Martinez, A. Devismes, Taku Gunji, Jan Rak, F. Kajihara, R. Granier de Cassagnac, H. Delagrange, S. Zhou, A. Baldisseri, Y. S. Kim, C. P. Singh, B. M. Johnson, C. Suire, J. Sziklai, Brian Cole, Saskia Mioduszewski, S. Takagi, K. N. Barish, Yves Roland Schutz, J. Jin, E. M. Takagui, T. J. Uam, M. L. Brooks, R. S. Towell, Akio Kiyomichi, Marie Germain, A. G. Litvinenko, A. Kozlov, G. R. Young, R. Seto, K. Haruna, V. Dzhordzhadze, N. Kurihara, X. He, O. O. Omiwade, V. Peresedov, H. Masui, A. K. Dubey, M. G. Hur, C. Y. Chi, K. Tanida, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, M. Muniruzzaman, and F. Staley

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, 01 natural sciences, 7. Clean energy, Helicity, Asymmetry, Gluon, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Perturbation theory (quantum mechanics), PHENIX detector, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, media_common
Abstract

We present an improved measurement of the double helicity asymmetry for pi(0) production in polarized proton-proton scattering at root s=200 GeV employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The improvements to our previous measurement come from two main factors: Inclusion of a new data set from the 2004 RHIC run with higher beam polarizations than the earlier run and a recalibration of the beam polarization measurements for the earlier run, which resulted in reduced uncertainties and increased beam polarizations. The results are compared to a Next to Leading Order (NLO) perturbative Quantum Chromodynamics (pQCD) calculation with a range of polarized gluon distributions.

Published
2006

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