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Measurement of the polarization of the upsilon(1S) and upsilon(2S) states in pp collisions at square root[s]=1.96 TeV.

V M Abazov, B Abbott, M Abolins, B S Acharya, M Adams, T Adams, E Aguilo, S H Ahn, M Ahsan, G D Alexeev, G Alkhazov, A Alton, G Alverson, G A Alves, M Anastasoaie, L S Ancu, T Andeen, S Anderson, B Andrieu, M S Anzelc, M Aoki, Y Arnoud, M Arov, M Arthaud, A Askew, B Asman, A C S Assis Jesus, O Atramentov, C Avila, F Badaud, A Baden, L Bagby, B Baldin, D V Bandurin, P Banerjee, S Banerjee, E Barberis, A-F Barfuss, P Bargassa, P Baringer, J Barreto, J F Bartlett, U Bassler, D Bauer, S Beale, A Bean, M Begalli, M Begel, C Belanger-Champagne, L Bellantoni, A Bellavance, J A Benitez, S B Beri, G Bernardi, R Bernhard, I Bertram, M Besançon, R Beuselinck, V A Bezzubov, P C Bhat, V Bhatnagar, C Biscarat, G Blazey, F Blekman, S Blessing, D Bloch, K Bloom, A Boehnlein, D Boline, T A Bolton, E E Boos, G Borissov, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, D Brown, N J Buchanan, D Buchholz, M Buehler, V Buescher, V Bunichev, S Burdin, S Burke, T H Burnett, C P Buszello, J M Butler, P Calfayan, S Calvet, J Cammin, W Carvalho, B C K Casey, H Castilla-Valdez, S Chakrabarti, D Chakraborty, K Chan, K M Chan, A Chandra, F Charles, E Cheu, F Chevallier, D K Cho, S Choi, B Choudhary, L Christofek, T Christoudias, S Cihangir, D Claes, J Clutter, M Cooke, W E Cooper, M Corcoran, F Couderc, M-C Cousinou, S Crépé-Renaudin, D Cutts, M Cwiok, H da Motta, A Das, G Davies, K De, S J de Jong, E De La Cruz-Burelo, C De Oliveira Martins, J D Degenhardt, F Déliot, M Demarteau, R Demina, D Denisov, S P Denisov, S Desai, H T Diehl, M Diesburg, A Dominguez, H Dong, L V Dudko, L Duflot, S R Dugad, D Duggan, A Duperrin, J Dyer, A Dyshkant, M Eads, D Edmunds, J Ellison, V D Elvira, Y Enari, S Eno, P Ermolov, H Evans, A Evdokimov, V N Evdokimov, A V Ferapontov, T Ferbel, F Fiedler, F Filthaut, W Fisher, H E Fisk, M Fortner, H Fox, S Fu, S Fuess, T Gadfort, C F Galea, E Gallas, C Garcia, A Garcia-Bellido, V Gavrilov, P Gay, W Geist, D Gelé, C E Gerber, Y Gershtein, D Gillberg, G Ginther, N Gollub, B Gómez, A Goussiou, P D Grannis, H Greenlee, Z D Greenwood, E M Gregores, G Grenier, Ph Gris, J-F Grivaz, A Grohsjean, S Grünendahl, M W Grünewald, F Guo, J Guo, G Gutierrez, P Gutierrez, A Haas, N J Hadley, P Haefner, S Hagopian, J Haley, I Hall, R E Hall, L Han, K Harder, A Harel, J M Hauptman, R Hauser, J Hays, T Hebbeker, D Hedin, J G Hegeman, A P Heinson, U Heintz, C Hensel, K Herner, G Hesketh, M D Hildreth, R Hirosky, J D Hobbs, B Hoeneisen, H Hoeth, M Hohlfeld, S J Hong, S Hossain, P Houben, Y Hu, Z Hubacek, V Hynek, I Iashvili, R Illingworth, A S Ito, S Jabeen, M Jaffré, S Jain, K Jakobs, C Jarvis, R Jesik, K Johns, C Johnson, M Johnson, A Jonckheere, P Jonsson, A Juste, E Kajfasz, J M Kalk, D Karmanov, P A Kasper, I Katsanos, D Kau, V Kaushik, R Kehoe, S Kermiche, N Khalatyan, A Khanov, A Kharchilava, Y M Kharzheev, D Khatidze, T J Kim, M H Kirby, M Kirsch, B Klima, J M Kohli, J-P Konrath, A V Kozelov, J Kraus, D Krop, T Kuhl, A Kumar, A Kupco, T Kurca, V A Kuzmin, J Kvita, F Lacroix, D Lam, S Lammers, G Landsberg, P Lebrun, W M Lee, A Leflat, J Lellouch, J Leveque, J Li, L Li, Q Z Li, S M Lietti, J G R Lima, D Lincoln, J Linnemann, V V Lipaev, R Lipton, Y Liu, Z Liu, A Lobodenko, M Lokajicek, P Love, H J Lubatti, R Luna, A L Lyon, A K A Maciel, D Mackin, R J Madaras, P Mättig, C Magass, A Magerkurth, P K Mal, H B Malbouisson, S Malik, V L Malyshev, H S Mao, Y Maravin, B Martin, R McCarthy, A Melnitchouk, L Mendoza, P G Mercadante, M Merkin, K W Merritt, A Meyer, J Meyer, T Millet, J Mitrevski, R K Mommsen, N K Mondal, R W Moore, T Moulik, G S Muanza, M Mulhearn, O Mundal, L Mundim, E Nagy, M Naimuddin, M Narain, N A Naumann, H A Neal, J P Negret, P Neustroev, H Nilsen, H Nogima, S F Novaes, T Nunnemann, V O'Dell, D C O'Neil, G Obrant, C Ochando, D Onoprienko, N Oshima, N Osman, J Osta, R Otec, G J Otero Y Garzón, M Owen, P Padley, M Pangilinan, N Parashar, S-J Park, S K Park, J Parsons, R Partridge, N Parua, A Patwa, G Pawloski, B Penning, M Perfilov, K Peters, Y Peters, P Pétroff, M Petteni, R Piegaia, J Piper, M-A Pleier, P L M Podesta-Lerma, V M Podstavkov, Y Pogorelov, M-E Pol, P Polozov, B G Pope, A V Popov, C Potter, W L Prado da Silva, H B Prosper, S Protopopescu, J Qian, A Quadt, B Quinn, A Rakitine, M S Rangel, K Ranjan, P N Ratoff, P Renkel, S Reucroft, P Rich, J Rieger, M Rijssenbeek, I Ripp-Baudot, F Rizatdinova, S Robinson, R F Rodrigues, M Rominsky, C Royon, P Rubinov, R Ruchti, G Safronov, G Sajot, A Sánchez-Hernández, M P Sanders, B Sanghi, A Santoro, G Savage, L Sawyer, T Scanlon, D Schaile, R D Schamberger, Y Scheglov, H Schellman, T Schliephake, C Schwanenberger, A Schwartzman, R Schwienhorst, J Sekaric, H Severini, E Shabalina, M Shamim, V Shary, A A Shchukin, R K Shivpuri, V Siccardi, V Simak, V Sirotenko, P Skubic, P Slattery, D Smirnov, G R Snow, J Snow, S Snyder, S Söldner-Rembold, L Sonnenschein, A Sopczak, M Sosebee, K Soustruznik, B Spurlock, J Stark, J Steele, V Stolin, D A Stoyanova, J Strandberg, S Strandberg, M A Strang, E Strauss, M Strauss, R Ströhmer, D Strom, L Stutte, S Sumowidagdo, P Svoisky, A Sznajder, P Tamburello, A Tanasijczuk, W Taylor, J Temple, B Tiller, F Tissandier, M Titov, V V Tokmenin, T Toole, I Torchiani, T Trefzger, D Tsybychev, B Tuchming, C Tully, P M Tuts, R Unalan, L Uvarov, S Uvarov, S Uzunyan, B Vachon, P J van den Berg, R Van Kooten, W M van Leeuwen, N Varelas, E W Varnes, I A Vasilyev, M Vaupel, P Verdier, L S Vertogradov, M Verzocchi, F Villeneuve-Seguier, P Vint, P Vokac, E Von Toerne, M Voutilainen, R Wagner, H D Wahl, L Wang, M H L S Wang, J Warchol, G Watts, M Wayne, G Weber, M Weber, L Welty-Rieger, A Wenger, N Wermes, M Wetstein, A White, D Wicke, G W Wilson, S J Wimpenny, M Wobisch, D R Wood, T R Wyatt, Y Xie, S Yacoob, R Yamada, M Yan, T Yasuda, Y A Yatsunenko, K Yip, H D Yoo, S W Youn, J Yu, C Zeitnitz, T Zhao, B Zhou, J Zhu, M Zielinski, D Zieminska, A Zieminski, L Zivkovic, V Zutshi, E G Zverev

Joint Institute for Nuclear Research, Dubna, Russia.
Physical Review Letters (Impact Factor: 7.94). 11/2008; 101(18):182004.
Source: PubMed

ABSTRACT We present a study of the polarization of the Upsilon(1S) and Upsilon(2S) states using a 1.3 fb;{-1} data sample collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron Collider. We measure the polarization parameter alpha=(sigma_{T}-2sigma_{L})/(sigma_{T}+2sigma_{L}), where sigma_{T} and sigma_{L} are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum (p_{T};{Upsilon}) for the Upsilon(1S) and Upsilon(2S). Significant p_{T};{Upsilon}-dependent longitudinal polarization is observed for the Upsilon(1S). A comparison with theoretical models is presented.

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