Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV

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 & 370 others 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, P. Chand, 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. Csörgo, 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, J. Egdemir, F. Ellinghaus, T. Engelmore, A. Enokizono, H. En'Yo, S. Esumi, K. O. Eyser, B. Fadem, D. E. Fields, M. Finger, M. Finger, 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, M. Heffner, T. K. Hemmick, T. Hester, X. He, J. C. Hill, M. Hohlmann, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, D. Hornback, S. Huang, T. Ichihara, R. Ichimiya, 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, Ju Hwan 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, A. Kiss, E. Kistenev, J. Klay, C. Klein-Boesing, L. Kochenda, V. Kochetkov, B. Komkov, M. Konno, J. Koster, A. Kozlov, A. Král, A. Kravitz, G. J. Kunde, K. Kurita, M. Kurosawa, M. J. Kweon, Youngil 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, P. Liebing, T. Liška, A. Litvinenko, H. Liu, M. X. Liu, X. Li, 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, H. Okada, K. Okada, M. Oka, 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, M. Reuter, 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, S. Taneja, 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. Vertesi, A. A. Vinogradov, M. Virius, V. Vrba, E. Vznuzdaev, D. Walker, X. R. Wang, Y. Watanabe, F. Wei, J. Wessels, S. N. White, S. Williamson, 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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Abstract

The double helicity asymmetry in neutral pion production for pT=1 to 12GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of -0.7<ΔG[0. 02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.

Original languageEnglish
Article number012003
JournalPhysical Review Letters
Volume103
Issue number1
DOIs
Publication statusPublished - 2009 Aug 6

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asymmetry
collisions
protons
predictions
inelastic scattering
pions
quantum chromodynamics
momentum

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Adare, A. ; Afanasiev, S. ; Aidala, C. ; Ajitanand, N. N. ; Akiba, Y. ; Al-Bataineh, H. ; Alexander, J. ; Aoki, K. ; Aphecetche, L. ; Asai, J. ; Atomssa, E. T. ; Averbeck, R. ; Awes, T. C. ; Azmoun, B. ; Babintsev, V. ; Bai, M. ; Baksay, G. ; Baksay, L. ; Baldisseri, A. ; Barish, K. N. ; Barnes, P. D. ; Bassalleck, B. ; Basye, A. T. ; Bathe, S. ; Batsouli, S. ; Baublis, V. ; Baumann, C. ; Bazilevsky, A. ; Belikov, S. ; Bennett, R. ; Berdnikov, A. ; Berdnikov, Y. ; Bickley, A. A. ; Boissevain, J. G. ; Borel, H. ; Boyle, K. ; Brooks, M. L. ; Buesching, H. ; Bumazhnov, V. ; Bunce, G. ; Butsyk, S. ; Camacho, C. M. ; Campbell, S. ; Chand, P. ; Chang, B. S. ; Chang, W. C. ; Charvet, J. L. ; Chernichenko, S. ; Chi, C. Y. ; Chiu, M. ; Choi, I. J. ; Choudhury, R. K. ; Chujo, T. ; Chung, P. ; Churyn, A. ; Cianciolo, V. ; Citron, Z. ; Cole, B. A. ; Constantin, P. ; Csanád, M. ; Csörgo, T. ; Dahms, T. ; Dairaku, S. ; Das, K. ; David, G. ; Denisov, A. ; D'Enterria, D. ; Deshpande, A. ; Desmond, E. J. ; Dietzsch, O. ; Dion, A. ; Donadelli, M. ; Drapier, O. ; Drees, A. ; Drees, K. A. ; Dubey, A. K. ; Durum, A. ; Dutta, D. ; Dzhordzhadze, V. ; Efremenko, Y. V. ; Egdemir, J. ; Ellinghaus, F. ; Engelmore, T. ; Enokizono, A. ; En'Yo, H. ; Esumi, S. ; Eyser, K. O. ; Fadem, B. ; Fields, D. E. ; Finger, M. ; Finger, M. ; Fleuret, F. ; Fokin, S. L. ; Fraenkel, Z. ; Frantz, J. E. ; Franz, A. ; Frawley, A. D. ; Fujiwara, K. ; Fukao, Y. ; Fusayasu, T. ; Garishvili, I. ; Glenn, A. ; Gong, H. ; Gonin, M. ; Gosset, J. ; Goto, Y. ; De Cassagnac, R. Granier ; Grau, N. ; Greene, S. V. ; Perdekamp, M. Grosse ; Gunji, T. ; Gustafsson, H. Å ; Henni, A. Hadj ; Haggerty, J. S. ; Hamagaki, H. ; Han, R. ; Hartouni, E. P. ; Haruna, K. ; Haslum, E. ; Hayano, R. ; Heffner, M. ; Hemmick, T. K. ; Hester, T. ; He, X. ; Hill, J. C. ; Hohlmann, M. ; Holzmann, W. ; Homma, K. ; Hong, B. ; Horaguchi, T. ; Hornback, D. ; Huang, S. ; Ichihara, T. ; Ichimiya, R. ; Ikeda, Y. ; Imai, K. ; Imrek, J. ; Inaba, M. ; Isenhower, D. ; Ishihara, M. ; Isobe, T. ; Issah, M. ; Isupov, A. ; Ivanischev, D. ; Jacak, B. V. ; Jia, J. ; Jin, J. ; Johnson, B. M. ; Joo, K. S. ; Jouan, D. ; Kajihara, F. ; Kametani, S. ; Kamihara, N. ; Kamin, J. ; Kang, Ju Hwan ; Kapustinsky, J. ; Kawall, D. ; Kazantsev, A. V. ; Kempel, T. ; Khanzadeev, A. ; Kijima, K. M. ; Kikuchi, J. ; Kim, B. I. ; Kim, D. H. ; Kim, D. J. ; Kim, E. ; Kim, S. H. ; Kinney, E. ; Kiriluk, K. ; Kiss, A. ; Kistenev, E. ; Klay, J. ; Klein-Boesing, C. ; Kochenda, L. ; Kochetkov, V. ; Komkov, B. ; Konno, M. ; Koster, J. ; Kozlov, A. ; Král, A. ; Kravitz, A. ; Kunde, G. J. ; Kurita, K. ; Kurosawa, M. ; Kweon, M. J. ; Kwon, Youngil ; Kyle, G. S. ; Lacey, R. ; Lai, Y. S. ; Lajoie, J. G. ; Layton, D. ; Lebedev, A. ; Lee, D. M. ; Lee, K. B. ; Lee, T. ; Leitch, M. J. ; Leite, M. A.L. ; Lenzi, B. ; Liebing, P. ; Liška, T. ; Litvinenko, A. ; Liu, H. ; Liu, M. X. ; Li, X. ; Love, B. ; Lynch, D. ; Maguire, C. F. ; Makdisi, Y. I. ; Malakhov, A. ; Malik, M. D. ; Manko, V. I. ; Mannel, E. ; Mao, Y. ; Mašek, L. ; Masui, H. ; Matathias, F. ; McCumber, M. ; McGaughey, P. L. ; Means, N. ; Meredith, B. ; Miake, Y. ; Mikeš, P. ; Miki, K. ; Milov, A. ; Mishra, M. ; Mitchell, J. T. ; Mohanty, A. K. ; Morino, Y. ; Morreale, A. ; Morrison, D. P. ; Moukhanova, T. V. ; Mukhopadhyay, D. ; Murata, J. ; Nagamiya, S. ; Nagle, J. L. ; Naglis, M. ; Nagy, M. I. ; Nakagawa, I. ; Nakamiya, Y. ; Nakamura, T. ; Nakano, K. ; Newby, J. ; Nguyen, M. ; Niita, T. ; Nouicer, R. ; Nyanin, A. S. ; O'Brien, E. ; Oda, S. X. ; Ogilvie, C. A. ; Okada, H. ; Okada, K. ; Oka, M. ; Onuki, Y. ; Oskarsson, A. ; Ouchida, M. ; Ozawa, K. ; Pak, R. ; 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. ; Purschke, M. L. ; Purwar, A. K. ; Qu, H. ; Rak, J. ; Rakotozafindrabe, A. ; Ravinovich, I. ; Read, K. F. ; Rembeczki, S. ; Reuter, M. ; Reygers, K. ; Riabov, V. ; Riabov, Y. ; Roach, D. ; Roche, G. ; Rolnick, S. D. ; Rosati, M. ; Rosendahl, S. S.E. ; Rosnet, P. ; Rukoyatkin, P. ; Ružička, P. ; Rykov, V. L. ; Sahlmueller, B. ; Saito, N. ; Sakaguchi, T. ; Sakai, S. ; Sakashita, K. ; Samsonov, V. ; Sato, T. ; Sawada, S. ; Sedgwick, K. ; Seele, J. ; Seidl, R. ; Semenov, A. Yu ; Semenov, V. ; Seto, R. ; Sharma, D. ; Shein, I. ; Shibata, T. A. ; Shigaki, K. ; Shimomura, M. ; Shoji, K. ; Shukla, P. ; Sickles, A. ; Silva, C. L. ; Silvermyr, D. ; Silvestre, C. ; Sim, K. S. ; Singh, B. K. ; Singh, C. P. ; Singh, V. ; Slunečka, M. ; 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. ; Sukhanov, A. ; Sziklai, J. ; Takagui, E. M. ; Taketani, A. ; Tanabe, R. ; Tanaka, Y. ; Taneja, S. ; Tanida, K. ; Tannenbaum, M. J. ; Taranenko, A. ; Tarján, P. ; Themann, H. ; Thomas, T. L. ; Togawa, M. ; Toia, A. ; Tomášek, L. ; Tomita, Y. ; Torii, H. ; Towell, R. S. ; Tram, V. N. ; Tserruya, I. ; Tsuchimoto, Y. ; Vale, C. ; Valle, H. ; Van Hecke, H. W. ; Veicht, A. ; Velkovska, J. ; Vertesi, R. ; Vinogradov, A. A. ; Virius, M. ; Vrba, V. ; Vznuzdaev, E. ; Walker, D. ; Wang, X. R. ; Watanabe, Y. ; Wei, F. ; Wessels, J. ; White, S. N. ; Williamson, S. ; Winter, D. ; Woody, C. L. ; Wysocki, M. ; Xie, W. ; Yamaguchi, Y. L. ; Yamaura, K. ; Yang, R. ; Yanovich, A. ; Ying, J. ; Yokkaichi, S. ; Young, G. R. ; Younus, I. ; Yushmanov, I. E. ; Zajc, W. A. ; Zaudtke, O. ; Zhang, C. ; Zhou, S. ; Zolin, L. / Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV. In: Physical Review Letters. 2009 ; Vol. 103, No. 1.
@article{023932ed294b49dc9fc48fb7302d7c3d,
title = "Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV",
abstract = "The double helicity asymmetry in neutral pion production for pT=1 to 12GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of -0.7<ΔG[0. 02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.",
author = "A. Adare and S. Afanasiev and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and H. Al-Bataineh and J. Alexander and K. Aoki and L. Aphecetche and J. Asai and Atomssa, {E. T.} and R. Averbeck and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and G. Baksay and L. Baksay and A. Baldisseri and Barish, {K. N.} and Barnes, {P. D.} and B. Bassalleck and Basye, {A. T.} and S. Bathe and S. Batsouli and V. Baublis and C. Baumann and A. Bazilevsky and S. Belikov and R. Bennett and A. Berdnikov and Y. Berdnikov and Bickley, {A. A.} and Boissevain, {J. G.} and H. Borel and K. Boyle and Brooks, {M. L.} and H. Buesching and V. Bumazhnov and G. Bunce and S. Butsyk and Camacho, {C. M.} and S. Campbell and P. Chand and Chang, {B. S.} and Chang, {W. C.} and Charvet, {J. L.} and S. Chernichenko and Chi, {C. Y.} and M. Chiu and Choi, {I. J.} and Choudhury, {R. K.} and T. Chujo and P. Chung and A. Churyn and V. Cianciolo and Z. Citron and Cole, {B. A.} and P. Constantin and M. Csan{\'a}d and T. Cs{\"o}rgo and T. Dahms and S. Dairaku and K. Das and G. David and A. Denisov and D. D'Enterria and A. Deshpande and Desmond, {E. J.} and O. Dietzsch and A. Dion and M. Donadelli and O. Drapier and A. Drees and Drees, {K. A.} and Dubey, {A. K.} and A. Durum and D. Dutta and V. Dzhordzhadze and Efremenko, {Y. V.} and J. Egdemir and F. Ellinghaus and T. Engelmore and A. Enokizono and H. En'Yo and S. Esumi and Eyser, {K. O.} and B. Fadem and Fields, {D. E.} and M. Finger and M. Finger and F. Fleuret and Fokin, {S. L.} and Z. Fraenkel and Frantz, {J. E.} and A. Franz and Frawley, {A. D.} and K. Fujiwara and Y. Fukao and T. Fusayasu and I. Garishvili and A. Glenn and H. Gong and M. Gonin and J. Gosset and Y. Goto and {De Cassagnac}, {R. Granier} and N. Grau and Greene, {S. V.} and Perdekamp, {M. Grosse} and T. Gunji and Gustafsson, {H. {\AA}} and Henni, {A. Hadj} and Haggerty, {J. S.} and H. Hamagaki and R. Han and Hartouni, {E. P.} and K. Haruna and E. Haslum and R. Hayano and M. Heffner and Hemmick, {T. K.} and T. Hester and X. He and Hill, {J. C.} and M. Hohlmann and W. Holzmann and K. Homma and B. Hong and T. Horaguchi and D. Hornback and S. Huang and T. Ichihara and R. Ichimiya and Y. Ikeda and K. Imai and J. Imrek and M. Inaba and D. Isenhower and M. Ishihara and T. Isobe and M. Issah and A. Isupov and D. Ivanischev and Jacak, {B. V.} and J. Jia and J. Jin and Johnson, {B. M.} and Joo, {K. S.} and D. Jouan and F. Kajihara and S. Kametani and N. Kamihara and J. Kamin and Kang, {Ju Hwan} and J. Kapustinsky and D. Kawall and Kazantsev, {A. V.} and T. Kempel and A. Khanzadeev and Kijima, {K. M.} and J. Kikuchi and Kim, {B. I.} and Kim, {D. H.} and Kim, {D. J.} and E. Kim and Kim, {S. H.} and E. Kinney and K. Kiriluk and A. Kiss and E. Kistenev and J. Klay and C. Klein-Boesing and L. Kochenda and V. Kochetkov and B. Komkov and M. Konno and J. Koster and A. Kozlov and A. Kr{\'a}l and A. Kravitz and Kunde, {G. J.} and K. Kurita and M. Kurosawa and Kweon, {M. J.} and Youngil Kwon and Kyle, {G. S.} and R. Lacey and Lai, {Y. S.} and Lajoie, {J. G.} and D. Layton and A. Lebedev and Lee, {D. M.} and Lee, {K. B.} and T. Lee and Leitch, {M. J.} and Leite, {M. A.L.} and B. Lenzi and P. Liebing and T. Liška and A. Litvinenko and H. Liu and Liu, {M. X.} and X. Li and B. Love and D. Lynch and Maguire, {C. F.} and Makdisi, {Y. I.} and A. Malakhov and Malik, {M. D.} and Manko, {V. I.} and E. Mannel and Y. Mao and L. Mašek and H. Masui and F. Matathias and M. McCumber and McGaughey, {P. L.} and N. Means and B. Meredith and Y. Miake and P. Mikeš and K. Miki and A. Milov and M. Mishra and Mitchell, {J. T.} and Mohanty, {A. K.} and Y. Morino and A. Morreale and Morrison, {D. P.} and Moukhanova, {T. V.} and D. Mukhopadhyay and J. Murata and S. Nagamiya and Nagle, {J. L.} and M. Naglis and Nagy, {M. I.} and I. Nakagawa and Y. Nakamiya and T. Nakamura and K. Nakano and J. Newby and M. Nguyen and T. Niita and R. Nouicer and Nyanin, {A. S.} and E. O'Brien and Oda, {S. X.} and Ogilvie, {C. A.} and H. Okada and K. Okada and M. Oka and Y. Onuki and A. Oskarsson and M. Ouchida and K. Ozawa and R. Pak 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 Purschke, {M. L.} and Purwar, {A. K.} and H. Qu and J. Rak and A. Rakotozafindrabe and I. Ravinovich and Read, {K. F.} and S. Rembeczki and M. Reuter and K. Reygers and V. Riabov and Y. Riabov and D. Roach and G. Roche and Rolnick, {S. D.} and M. Rosati and Rosendahl, {S. S.E.} and P. Rosnet and P. Rukoyatkin and P. Ružička and Rykov, {V. L.} and B. Sahlmueller and N. Saito and T. Sakaguchi and S. Sakai and K. Sakashita and V. Samsonov and T. Sato and S. Sawada and K. Sedgwick and J. Seele and R. Seidl and Semenov, {A. Yu} and V. Semenov and R. Seto and D. Sharma and I. Shein and Shibata, {T. A.} and K. Shigaki and M. Shimomura and K. Shoji and P. Shukla and A. Sickles and Silva, {C. L.} and D. Silvermyr and C. Silvestre and Sim, {K. S.} and Singh, {B. K.} and Singh, {C. P.} and V. Singh and M. Slunečka 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 A. Sukhanov and J. Sziklai and Takagui, {E. M.} and A. Taketani and R. Tanabe and Y. Tanaka and S. Taneja and K. Tanida and Tannenbaum, {M. J.} and A. Taranenko and P. Tarj{\'a}n and H. Themann and Thomas, {T. L.} and M. Togawa and A. Toia and L. Tom{\'a}šek and Y. Tomita and H. Torii and Towell, {R. S.} and Tram, {V. N.} and I. Tserruya and Y. Tsuchimoto and C. Vale and H. Valle and {Van Hecke}, {H. W.} and A. Veicht and J. Velkovska and R. Vertesi and Vinogradov, {A. A.} and M. Virius and V. Vrba and E. Vznuzdaev and D. Walker and Wang, {X. R.} and Y. Watanabe and F. Wei and J. Wessels and White, {S. N.} and S. Williamson and D. Winter and Woody, {C. L.} and M. Wysocki and W. Xie and Yamaguchi, {Y. L.} and K. Yamaura and R. Yang and A. Yanovich and J. Ying 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 S. Zhou and L. Zolin",
year = "2009",
month = "8",
day = "6",
doi = "10.1103/PhysRevLett.103.012003",
language = "English",
volume = "103",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "1",

}

Adare, A, Afanasiev, S, Aidala, C, Ajitanand, NN, Akiba, Y, Al-Bataineh, H, Alexander, J, Aoki, K, Aphecetche, L, Asai, J, Atomssa, ET, Averbeck, R, Awes, TC, Azmoun, B, Babintsev, V, Bai, M, Baksay, G, Baksay, L, Baldisseri, A, Barish, KN, Barnes, PD, Bassalleck, B, Basye, AT, Bathe, S, Batsouli, S, Baublis, V, Baumann, C, Bazilevsky, A, Belikov, S, Bennett, R, Berdnikov, A, Berdnikov, Y, Bickley, AA, Boissevain, JG, Borel, H, Boyle, K, Brooks, ML, Buesching, H, Bumazhnov, V, Bunce, G, Butsyk, S, Camacho, CM, Campbell, S, Chand, P, Chang, BS, Chang, WC, Charvet, JL, Chernichenko, S, Chi, CY, Chiu, M, Choi, IJ, Choudhury, RK, Chujo, T, Chung, P, Churyn, A, Cianciolo, V, Citron, Z, Cole, BA, Constantin, P, Csanád, M, Csörgo, T, Dahms, T, Dairaku, S, Das, K, David, G, Denisov, A, D'Enterria, D, Deshpande, A, Desmond, EJ, Dietzsch, O, Dion, A, Donadelli, M, Drapier, O, Drees, A, Drees, KA, Dubey, AK, Durum, A, Dutta, D, Dzhordzhadze, V, Efremenko, YV, Egdemir, J, Ellinghaus, F, Engelmore, T, Enokizono, A, En'Yo, H, Esumi, S, Eyser, KO, Fadem, B, Fields, DE, Finger, M, Finger, M, Fleuret, F, Fokin, SL, Fraenkel, Z, Frantz, JE, Franz, A, Frawley, AD, Fujiwara, K, Fukao, Y, Fusayasu, T, Garishvili, I, Glenn, A, Gong, H, Gonin, M, Gosset, J, Goto, Y, De Cassagnac, RG, Grau, N, Greene, SV, Perdekamp, MG, Gunji, T, Gustafsson, HÅ, Henni, AH, Haggerty, JS, Hamagaki, H, Han, R, Hartouni, EP, Haruna, K, Haslum, E, Hayano, R, Heffner, M, Hemmick, TK, Hester, T, He, X, Hill, JC, Hohlmann, M, Holzmann, W, Homma, K, Hong, B, Horaguchi, T, Hornback, D, Huang, S, Ichihara, T, Ichimiya, R, Ikeda, Y, Imai, K, Imrek, J, Inaba, M, Isenhower, D, Ishihara, M, Isobe, T, Issah, M, Isupov, A, Ivanischev, D, Jacak, BV, Jia, J, Jin, J, Johnson, BM, Joo, KS, Jouan, D, Kajihara, F, Kametani, S, Kamihara, N, Kamin, J, Kang, JH, Kapustinsky, J, Kawall, D, Kazantsev, AV, Kempel, T, Khanzadeev, A, Kijima, KM, Kikuchi, J, Kim, BI, Kim, DH, Kim, DJ, Kim, E, Kim, SH, Kinney, E, Kiriluk, K, Kiss, A, Kistenev, E, Klay, J, Klein-Boesing, C, Kochenda, L, Kochetkov, V, Komkov, B, Konno, M, Koster, J, Kozlov, A, Král, A, Kravitz, A, Kunde, GJ, Kurita, K, Kurosawa, M, Kweon, MJ, Kwon, Y, Kyle, GS, Lacey, R, Lai, YS, Lajoie, JG, Layton, D, Lebedev, A, Lee, DM, Lee, KB, Lee, T, Leitch, MJ, Leite, MAL, Lenzi, B, Liebing, P, Liška, T, Litvinenko, A, Liu, H, Liu, MX, Li, X, Love, B, Lynch, D, Maguire, CF, Makdisi, YI, Malakhov, A, Malik, MD, Manko, VI, Mannel, E, Mao, Y, Mašek, L, Masui, H, Matathias, F, McCumber, M, McGaughey, PL, Means, N, Meredith, B, Miake, Y, Mikeš, P, Miki, K, Milov, A, Mishra, M, Mitchell, JT, Mohanty, AK, Morino, Y, Morreale, A, Morrison, DP, Moukhanova, TV, Mukhopadhyay, D, Murata, J, Nagamiya, S, Nagle, JL, Naglis, M, Nagy, MI, Nakagawa, I, Nakamiya, Y, Nakamura, T, Nakano, K, Newby, J, Nguyen, M, Niita, T, Nouicer, R, Nyanin, AS, O'Brien, E, Oda, SX, Ogilvie, CA, Okada, H, Okada, K, Oka, M, Onuki, Y, Oskarsson, A, Ouchida, M, Ozawa, K, Pak, R, Palounek, APT, Pantuev, V, Papavassiliou, V, Park, J, Park, WJ, Pate, SF, Pei, H, Peng, JC, Pereira, H, Peresedov, V, Peressounko, DY, Pinkenburg, C, Purschke, ML, Purwar, AK, Qu, H, Rak, J, Rakotozafindrabe, A, Ravinovich, I, Read, KF, Rembeczki, S, Reuter, M, Reygers, K, Riabov, V, Riabov, Y, Roach, D, Roche, G, Rolnick, SD, Rosati, M, Rosendahl, SSE, Rosnet, P, Rukoyatkin, P, Ružička, P, Rykov, VL, Sahlmueller, B, Saito, N, Sakaguchi, T, Sakai, S, Sakashita, K, Samsonov, V, Sato, T, Sawada, S, Sedgwick, K, Seele, J, Seidl, R, Semenov, AY, Semenov, V, Seto, R, Sharma, D, Shein, I, Shibata, TA, Shigaki, K, Shimomura, M, Shoji, K, Shukla, P, Sickles, A, Silva, CL, Silvermyr, D, Silvestre, C, Sim, KS, Singh, BK, Singh, CP, Singh, V, Slunečka, M, 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, Sukhanov, A, Sziklai, J, Takagui, EM, Taketani, A, Tanabe, R, Tanaka, Y, Taneja, S, Tanida, K, Tannenbaum, MJ, Taranenko, A, Tarján, P, Themann, H, Thomas, TL, Togawa, M, Toia, A, Tomášek, L, Tomita, Y, Torii, H, Towell, RS, Tram, VN, Tserruya, I, Tsuchimoto, Y, Vale, C, Valle, H, Van Hecke, HW, Veicht, A, Velkovska, J, Vertesi, R, Vinogradov, AA, Virius, M, Vrba, V, Vznuzdaev, E, Walker, D, Wang, XR, Watanabe, Y, Wei, F, Wessels, J, White, SN, Williamson, S, Winter, D, Woody, CL, Wysocki, M, Xie, W, Yamaguchi, YL, Yamaura, K, Yang, R, Yanovich, A, Ying, J, Yokkaichi, S, Young, GR, Younus, I, Yushmanov, IE, Zajc, WA, Zaudtke, O, Zhang, C, Zhou, S & Zolin, L 2009, 'Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV', Physical Review Letters, vol. 103, no. 1, 012003. https://doi.org/10.1103/PhysRevLett.103.012003

Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV. / Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Al-Bataineh, H.; Alexander, J.; Aoki, K.; Aphecetche, L.; Asai, J.; Atomssa, E. T.; Averbeck, R.; Awes, T. C.; Azmoun, B.; Babintsev, V.; Bai, M.; Baksay, G.; Baksay, L.; Baldisseri, A.; Barish, K. N.; Barnes, P. D.; Bassalleck, B.; Basye, A. T.; Bathe, S.; Batsouli, S.; Baublis, V.; Baumann, C.; Bazilevsky, A.; Belikov, S.; Bennett, R.; Berdnikov, A.; Berdnikov, Y.; Bickley, A. A.; Boissevain, J. G.; Borel, H.; Boyle, K.; Brooks, M. L.; Buesching, H.; Bumazhnov, V.; Bunce, G.; Butsyk, S.; Camacho, C. M.; Campbell, S.; Chand, P.; Chang, B. S.; Chang, W. C.; Charvet, J. L.; Chernichenko, S.; Chi, C. Y.; Chiu, M.; Choi, I. J.; Choudhury, R. K.; Chujo, T.; Chung, P.; Churyn, A.; Cianciolo, V.; Citron, Z.; Cole, B. A.; Constantin, P.; Csanád, M.; Csörgo, T.; Dahms, T.; Dairaku, S.; Das, K.; David, G.; Denisov, A.; D'Enterria, D.; Deshpande, A.; Desmond, E. J.; Dietzsch, O.; Dion, A.; Donadelli, M.; Drapier, O.; Drees, A.; Drees, K. A.; Dubey, A. K.; Durum, A.; Dutta, D.; Dzhordzhadze, V.; Efremenko, Y. V.; Egdemir, J.; Ellinghaus, F.; Engelmore, T.; Enokizono, A.; En'Yo, H.; Esumi, S.; Eyser, K. O.; Fadem, B.; Fields, D. E.; Finger, M.; Finger, M.; Fleuret, F.; Fokin, S. L.; Fraenkel, Z.; Frantz, J. E.; Franz, A.; Frawley, A. D.; Fujiwara, K.; Fukao, Y.; Fusayasu, T.; Garishvili, I.; Glenn, A.; Gong, H.; Gonin, M.; Gosset, J.; Goto, Y.; De Cassagnac, R. Granier; Grau, N.; Greene, S. V.; Perdekamp, M. Grosse; Gunji, T.; Gustafsson, H. Å; Henni, A. Hadj; Haggerty, J. S.; Hamagaki, H.; Han, R.; Hartouni, E. P.; Haruna, K.; Haslum, E.; Hayano, R.; Heffner, M.; Hemmick, T. K.; Hester, T.; He, X.; Hill, J. C.; Hohlmann, M.; Holzmann, W.; Homma, K.; Hong, B.; Horaguchi, T.; Hornback, D.; Huang, S.; Ichihara, T.; Ichimiya, R.; Ikeda, Y.; Imai, K.; Imrek, J.; Inaba, M.; Isenhower, D.; Ishihara, M.; Isobe, T.; Issah, M.; Isupov, A.; Ivanischev, D.; Jacak, B. V.; Jia, J.; Jin, J.; Johnson, B. M.; Joo, K. S.; Jouan, D.; Kajihara, F.; Kametani, S.; Kamihara, N.; Kamin, J.; Kang, Ju Hwan; Kapustinsky, J.; Kawall, D.; Kazantsev, A. V.; Kempel, T.; Khanzadeev, A.; Kijima, K. M.; Kikuchi, J.; Kim, B. I.; Kim, D. H.; Kim, D. J.; Kim, E.; Kim, S. H.; Kinney, E.; Kiriluk, K.; Kiss, A.; Kistenev, E.; Klay, J.; Klein-Boesing, C.; Kochenda, L.; Kochetkov, V.; Komkov, B.; Konno, M.; Koster, J.; Kozlov, A.; Král, A.; Kravitz, A.; Kunde, G. J.; Kurita, K.; Kurosawa, M.; Kweon, M. J.; Kwon, Youngil; Kyle, G. S.; Lacey, R.; Lai, Y. S.; Lajoie, J. G.; Layton, D.; Lebedev, A.; Lee, D. M.; Lee, K. B.; Lee, T.; Leitch, M. J.; Leite, M. A.L.; Lenzi, B.; Liebing, P.; Liška, T.; Litvinenko, A.; Liu, H.; Liu, M. X.; Li, X.; Love, B.; Lynch, D.; Maguire, C. F.; Makdisi, Y. I.; Malakhov, A.; Malik, M. D.; Manko, V. I.; Mannel, E.; Mao, Y.; Mašek, L.; Masui, H.; Matathias, F.; McCumber, M.; McGaughey, P. L.; Means, N.; Meredith, B.; Miake, Y.; Mikeš, P.; Miki, K.; Milov, A.; Mishra, M.; Mitchell, J. T.; Mohanty, A. K.; Morino, Y.; Morreale, A.; Morrison, D. P.; Moukhanova, T. V.; Mukhopadhyay, D.; Murata, J.; Nagamiya, S.; Nagle, J. L.; Naglis, M.; Nagy, M. I.; Nakagawa, I.; Nakamiya, Y.; Nakamura, T.; Nakano, K.; Newby, J.; Nguyen, M.; Niita, T.; Nouicer, R.; Nyanin, A. S.; O'Brien, E.; Oda, S. X.; Ogilvie, C. A.; Okada, H.; Okada, K.; Oka, M.; Onuki, Y.; Oskarsson, A.; Ouchida, M.; Ozawa, K.; Pak, R.; 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.; Purschke, M. L.; Purwar, A. K.; Qu, H.; Rak, J.; Rakotozafindrabe, A.; Ravinovich, I.; Read, K. F.; Rembeczki, S.; Reuter, M.; Reygers, K.; Riabov, V.; Riabov, Y.; Roach, D.; Roche, G.; Rolnick, S. D.; Rosati, M.; Rosendahl, S. S.E.; Rosnet, P.; Rukoyatkin, P.; Ružička, P.; Rykov, V. L.; Sahlmueller, B.; Saito, N.; Sakaguchi, T.; Sakai, S.; Sakashita, K.; Samsonov, V.; Sato, T.; Sawada, S.; Sedgwick, K.; Seele, J.; Seidl, R.; Semenov, A. Yu; Semenov, V.; Seto, R.; Sharma, D.; Shein, I.; Shibata, T. A.; Shigaki, K.; Shimomura, M.; Shoji, K.; Shukla, P.; Sickles, A.; Silva, C. L.; Silvermyr, D.; Silvestre, C.; Sim, K. S.; Singh, B. K.; Singh, C. P.; Singh, V.; Slunečka, M.; 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.; Sukhanov, A.; Sziklai, J.; Takagui, E. M.; Taketani, A.; Tanabe, R.; Tanaka, Y.; Taneja, S.; Tanida, K.; Tannenbaum, M. J.; Taranenko, A.; Tarján, P.; Themann, H.; Thomas, T. L.; Togawa, M.; Toia, A.; Tomášek, L.; Tomita, Y.; Torii, H.; Towell, R. S.; Tram, V. N.; Tserruya, I.; Tsuchimoto, Y.; Vale, C.; Valle, H.; Van Hecke, H. W.; Veicht, A.; Velkovska, J.; Vertesi, R.; Vinogradov, A. A.; Virius, M.; Vrba, V.; Vznuzdaev, E.; Walker, D.; Wang, X. R.; Watanabe, Y.; Wei, F.; Wessels, J.; White, S. N.; Williamson, S.; Winter, D.; Woody, C. L.; Wysocki, M.; Xie, W.; Yamaguchi, Y. L.; Yamaura, K.; Yang, R.; Yanovich, A.; Ying, J.; Yokkaichi, S.; Young, G. R.; Younus, I.; Yushmanov, I. E.; Zajc, W. A.; Zaudtke, O.; Zhang, C.; Zhou, S.; Zolin, L.

In: Physical Review Letters, Vol. 103, No. 1, 012003, 06.08.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV

AU - Adare, A.

AU - Afanasiev, S.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Al-Bataineh, H.

AU - Alexander, J.

AU - Aoki, K.

AU - Aphecetche, L.

AU - Asai, J.

AU - Atomssa, E. T.

AU - Averbeck, R.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Baksay, G.

AU - Baksay, L.

AU - Baldisseri, A.

AU - Barish, K. N.

AU - Barnes, P. D.

AU - Bassalleck, B.

AU - Basye, A. T.

AU - Bathe, S.

AU - Batsouli, S.

AU - Baublis, V.

AU - Baumann, C.

AU - Bazilevsky, A.

AU - Belikov, S.

AU - Bennett, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Bickley, A. A.

AU - Boissevain, J. G.

AU - Borel, H.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Bunce, G.

AU - Butsyk, S.

AU - Camacho, C. M.

AU - Campbell, S.

AU - Chand, P.

AU - Chang, B. S.

AU - Chang, W. C.

AU - Charvet, J. L.

AU - Chernichenko, S.

AU - Chi, C. Y.

AU - Chiu, M.

AU - Choi, I. J.

AU - Choudhury, R. K.

AU - Chujo, T.

AU - Chung, P.

AU - Churyn, A.

AU - Cianciolo, V.

AU - Citron, Z.

AU - Cole, B. A.

AU - Constantin, P.

AU - Csanád, M.

AU - Csörgo, T.

AU - Dahms, T.

AU - Dairaku, S.

AU - Das, K.

AU - David, G.

AU - Denisov, A.

AU - D'Enterria, D.

AU - Deshpande, A.

AU - Desmond, E. J.

AU - Dietzsch, O.

AU - Dion, A.

AU - Donadelli, M.

AU - Drapier, O.

AU - Drees, A.

AU - Drees, K. A.

AU - Dubey, A. K.

AU - Durum, A.

AU - Dutta, D.

AU - Dzhordzhadze, V.

AU - Efremenko, Y. V.

AU - Egdemir, J.

AU - Ellinghaus, F.

AU - Engelmore, T.

AU - Enokizono, A.

AU - En'Yo, H.

AU - Esumi, S.

AU - Eyser, K. O.

AU - Fadem, B.

AU - Fields, D. E.

AU - Finger, M.

AU - Finger, M.

AU - Fleuret, F.

AU - Fokin, S. L.

AU - Fraenkel, Z.

AU - Frantz, J. E.

AU - Franz, A.

AU - Frawley, A. D.

AU - Fujiwara, K.

AU - Fukao, Y.

AU - Fusayasu, T.

AU - Garishvili, I.

AU - Glenn, A.

AU - Gong, H.

AU - Gonin, M.

AU - Gosset, J.

AU - Goto, Y.

AU - De Cassagnac, R. Granier

AU - Grau, N.

AU - Greene, S. V.

AU - Perdekamp, M. Grosse

AU - Gunji, T.

AU - Gustafsson, H. Å

AU - Henni, A. Hadj

AU - Haggerty, J. S.

AU - Hamagaki, H.

AU - Han, R.

AU - Hartouni, E. P.

AU - Haruna, K.

AU - Haslum, E.

AU - Hayano, R.

AU - Heffner, M.

AU - Hemmick, T. K.

AU - Hester, T.

AU - He, X.

AU - Hill, J. C.

AU - Hohlmann, M.

AU - Holzmann, W.

AU - Homma, K.

AU - Hong, B.

AU - Horaguchi, T.

AU - Hornback, D.

AU - Huang, S.

AU - Ichihara, T.

AU - Ichimiya, R.

AU - Ikeda, Y.

AU - Imai, K.

AU - Imrek, J.

AU - Inaba, M.

AU - Isenhower, D.

AU - Ishihara, M.

AU - Isobe, T.

AU - Issah, M.

AU - Isupov, A.

AU - Ivanischev, D.

AU - Jacak, B. V.

AU - Jia, J.

AU - Jin, J.

AU - Johnson, B. M.

AU - Joo, K. S.

AU - Jouan, D.

AU - Kajihara, F.

AU - Kametani, S.

AU - Kamihara, N.

AU - Kamin, J.

AU - Kang, Ju Hwan

AU - Kapustinsky, J.

AU - Kawall, D.

AU - Kazantsev, A. V.

AU - Kempel, T.

AU - Khanzadeev, A.

AU - Kijima, K. M.

AU - Kikuchi, J.

AU - Kim, B. I.

AU - Kim, D. H.

AU - Kim, D. J.

AU - Kim, E.

AU - Kim, S. H.

AU - Kinney, E.

AU - Kiriluk, K.

AU - Kiss, A.

AU - Kistenev, E.

AU - Klay, J.

AU - Klein-Boesing, C.

AU - Kochenda, L.

AU - Kochetkov, V.

AU - Komkov, B.

AU - Konno, M.

AU - Koster, J.

AU - Kozlov, A.

AU - Král, A.

AU - Kravitz, A.

AU - Kunde, G. J.

AU - Kurita, K.

AU - Kurosawa, M.

AU - Kweon, M. J.

AU - Kwon, Youngil

AU - Kyle, G. S.

AU - Lacey, R.

AU - Lai, Y. S.

AU - Lajoie, J. G.

AU - Layton, D.

AU - Lebedev, A.

AU - Lee, D. M.

AU - Lee, K. B.

AU - Lee, T.

AU - Leitch, M. J.

AU - Leite, M. A.L.

AU - Lenzi, B.

AU - Liebing, P.

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PY - 2009/8/6

Y1 - 2009/8/6

N2 - The double helicity asymmetry in neutral pion production for pT=1 to 12GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of -0.7<ΔG[0. 02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.

AB - The double helicity asymmetry in neutral pion production for pT=1 to 12GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of -0.7<ΔG[0. 02,0.3]<0.5 at Δχ2=9 (∼3σ) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.

UR - http://www.scopus.com/inward/record.url?scp=68749098511&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=68749098511&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.103.012003

DO - 10.1103/PhysRevLett.103.012003

M3 - Article

VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 1

M1 - 012003

ER -