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Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV

Adler, SS; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Al-Jamel, A; Alexander, J; Aoki, K; Aphecetche, L and Armendariz, R, et al. (2004) In Physical Review Letters 93(20: 202002).
Abstract
We present a measurement of the double longitudinal spin asymmetry in inclusive pi(0) production in polarized proton-proton collisions at roots=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.
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Physical Review Letters
volume
93
issue
20: 202002
publisher
American Physical Society
external identifiers
  • pmid:15600917
  • wos:000225068800017
  • scopus:79953318320
ISSN
1079-7114
DOI
10.1103/PhysRevLett.93.202002
language
English
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a5da1d3b-738e-484d-bcf9-98cbf9ca467d (old id 260406)
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2007-08-28 12:23:53
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@article{a5da1d3b-738e-484d-bcf9-98cbf9ca467d,
  abstract     = {We present a measurement of the double longitudinal spin asymmetry in inclusive pi(0) production in polarized proton-proton collisions at roots=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.},
  articleno    = {202002},
  author       = {Adler, SS and Afanasiev, S and Aidala, C and Ajitanand, NN and Akiba, Y and Al-Jamel, A and Alexander, J and Aoki, K and Aphecetche, L and Armendariz, R and Aronson, SH and Averbeck, R and Awes, TC and Babintsev, V and Baldisseri, A and Barish, KN and Barnes, PD and Bassalleck, B and Bathe, S and Batsouli, S and Baublis, V and Bauer, F and Bazilevsky, A and Belikov, S and Bjorndal, MT and Boissevain, JG and Borel, H and Brooks, ML and Brown, DS and Bruner, N and Bucher, D and Buesching, H and Bumazhnov, V and Bunce, G and Burward-Hoy, JM and Butsyk, S and Camard, X and Chand, P and Chang, WC and Chernichenko, S and Chi, CY and Chiba, J and Chiu, M and Choi, IJ and Choudhury, RK and Chujo, T and Cianciolo, V and Cobigo, Y and Cole, BA and Comets, MP and Constantin, P and Csanad, M and Csorgo, T and Cussonneau, JP and d'Enterria, D and Das, K and David, G and Deak, F and Delagrange, H and Denisov, A and Deshpande, A and Desmond, EJ and Devismes, A and Dietzsch, O and Drachenberg, JL and Drapier, O and Drees, A and Durum, A and Dutta, D and Dzhordzhadze, V and Efremenko, YV and En'yo, H and Espagnon, B and Esumi, S and Fields, DE and Finck, C and Fleuret, F and Fokin, SL and Fox, BD and Fraenkel, Z and Frantz, JE and Franz, A and Frawley, AD and Fukao, Y and Fung, SY and Gadrat, S and Germain, M and Glenn, A and Gonin, M and Gosset, J and Goto, Y and de Cassagnac, RG and Grau, N and Greene, SV and Perdekamp, MG and Gustafsson, Hans-Åke and Hachiya, T and Haggerty, JS and Hamagaki, H and Hansen, AG and Hartouni, EP and Harvey, M and Hasuko, K and Hayano, R and He, X and Heffner, M and Hemmick, TK and Heuser, JM and Hidas, P and Hiejima, H and Hill, JC and Hobbs, R and Holzmann, W and Homma, K and Hong, B and Hoover, A and Horaguchi, T and Ichihara, T and Ikonnikov, VV and Imai, K and Inaba, M and Inuzuka, M and Isenhower, D and Isenhower, L and Ishihara, M and Issah, M and Isupov, A and Jacak, BV and Jia, J and Jinnouchi, O and Johnson, BM and Johnson, SC and Joo, KS and Jouan, D and Kajihara, F and Kametani, S and Kamihara, N and Kaneta, M and Kang, JH and Katou, K and Kawabata, T and Kazantsev, A and Kelly, S and Khachaturov, B and Khanzadeev, A and Kikuchi, J and Kim, DJ and Kim, E and Kim, GB and Kim, HJ and Kinney, E and Kiss, A and Kistenev, E and Kiyomichi, A and Klein-Boesing, C and Kobayashi, H and Kochetkov, V and Kohara, R and Komkov, B and Konno, M and Kotchetkov, D and Kozlov, A and Kroon, PJ and Kuberg, CH and Kunde, GJ and Kurita, K and Kweon, MJ and Kwon, Y and Kyle, GS and Lacey, R and Lajoie, JG and Le Bornec, Y and Lebedev, A and Leckey, S and Lee, DM and Leitch, MJ and Leite, MAL and Li, X and Li, XH and Lim, H and Litvinenko, A and Liu, MX and Maguire, CF and Makdisi, YI and Malakhov, A and Manko, VI and Mao, Y and Martinez, G and Masui, H and Matathias, F and Matsumoto, T and McCain, MC and McGaughey, PL and Miake, Y and Miller, TE and Milov, A and Mioduszewski, S and Mishra, GC and Mitchell, JT and Mohanty, AK and Morrison, DP and Moss, JM and Mukhopadhyay, D and Muniruzzaman, M and Nagamiya, S and Nagle, JL and Nakamura, T and Newby, J and Nyanin, AS and Nystrand, Joakim and O'Brien, E and Ogilvie, CA and Ohnishi, H and Ojha, ID and Okada, H and Okada, K and Oskarsson, Anders and Otterlund, Ingvar and Oyama, K and Ozawa, K and Pal, D and Palounek, APT and Pantuev, V and Papavassiliou, V and Park, J and Park, WJ and Pate, SF and Pei, H and Penev, V and Peng, JC and Pereira, H and Peresedov, V and Pierson, A and Pinkenburg, C and Pisani, RP and Purschke, ML and Purwar, AK and Qualls, J and Rak, J and Ravinovich, I and Read, KF and Reuter, M and Reygers, K and Riabov, V and Riabov, Y and Roche, G and Romana, A and Rosati, M and Rosendahl, Sarah and Rosnet, P and Rykov, VL and Ryu, SS and Saito, N and Sakaguchi, T and Sakai, S and Samsonov, V and Sanfratello, L and Santo, R and Sato, HD and Sato, S and Sawada, S and Schutz, Y and Semenov, V and Seto, R and Shea, TK and Shein, I and Shibata, TA and Shigaki, K and Shimomura, M and Sickles, A and Silva, CL and Silvermyr, D and Sim, KS and Soldatov, A and Soltz, RA and Sondheim, WE and Sorensen, S and Sourikova, IV and Staley, F and Stankus, PW and Stenlund, Evert and Stepanov, M and Ster, A and Stoll, SP and Sugitate, T and Sullivan, JP and Takagi, S and Takagui, EM and Taketani, A and Tanaka, KH and Tanaka, Y and Tanida, K and Tannenbaum, MJ and Taranenko, A and Tarjan, P and Thomas, TL and Togawa, M and Tojo, J and Torii, H and Towell, RS and Tram, VN and Tserruya, I and Tsuchimoto, Y and Tydesjö, Henrik and Tyurin, N and Uam, TJ and van Hecke, HW and Velkovska, J and Velkovsky, M and Veszpremi, V and Vinogradov, AA and Volkov, MA and Vznuzdaev, E and Wang, XR and Watanabe, Y and White, SN and Willis, N and Wohn, FK and Woody, CL and Xie, W and Yanovich, A and Yokkaichi, S and Young, GR and Yushmanov, IE and Zajc, WA and Zaudtke, O and Zhang, C and Zhou, S and Zimanyi, J and Zolin, L and Zong, X},
  issn         = {1079-7114},
  language     = {eng},
  number       = {20: 202002},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.93.202002},
  volume       = {93},
  year         = {2004},
}