Forward neutral-pion transverse single-spin asymmetries in p + p collisions at sqrt[s] = 200 GeV

B I Abelev; M M Aggarwal; Z Ahammed; B D Anderson; D Arkhipkin; G S Averichev; Y Bai; J Balewski; O Barannikova; L S Barnby; J Baudot; S Baumgart; D R Beavis; R Bellwied; F Benedosso; R R Betts; S Bhardwaj; A Bhasin; A K Bhati; H Bichsel; J Bielcik; J Bielcikova; L C Bland; S-L Blyth; M Bombara; B E Bonner; M Botje; J Bouchet; E Braidot; A V Brandin; S Bueltmann; T P Burton; M Bystersky; X Z Cai; H Caines; M Calderón de la Barca Sánchez; J Callner; O Catu; D Cebra; M C Cervantes; Z Chajecki; P Chaloupka; S Chattopadhyay; H F Chen; J H Chen; J Y Chen; J Cheng; M Cherney; A Chikanian; K E Choi; W Christie; S U Chung; R F Clarke; M J M Codrington; J P Coffin; T M Cormier; M R Cosentino; J G Cramer; H J Crawford; D Das; S Dash; M Daugherity; M M de Moura; T G Dedovich; M DePhillips; A A Derevschikov; R Derradi de Souza; L Didenko; T Dietel; P Djawotho; S M Dogra; X Dong; J L Drachenberg; J E Draper; F Du; J C Dunlop; M R Dutta Mazumdar; W R Edwards; L G Efimov; E Elhalhuli; V Emelianov; J Engelage; G Eppley; B Erazmus; M Estienne; L Eun; P Fachini; R Fatemi; J Fedorisin; A Feng; P Filip; E Finch; V Fine; Y Fisyak; J Fu; C A Gagliardi; L Gaillard; M S Ganti; E Garcia-Solis; V Ghazikhanian; P Ghosh; Y N Gorbunov; A Gordon; H Gos; O Grebenyuk; D Grosnick; B Grube; S M Guertin; K S F F Guimaraes; A Gupta; N Gupta; W Guryn; B Haag; T J Hallman; A Hamed; J W Harris; W He; M Heinz; T W Henry; S Heppelmann; B Hippolyte; A Hirsch; E Hjort; A M Hoffman; G W Hoffmann; D J Hofman; R S Hollis; M J Horner; H Z Huang; E W Hughes; T J Humanic; G Igo; A Iordanova; P Jacobs; W W Jacobs; P Jakl; F Jin; P G Jones; E G Judd; S Kabana; K Kajimoto; K Kang; J Kapitan; M Kaplan; D Keane; A Kechechyan; D Kettler; V Yu Khodyrev; J Kiryluk; A Kisiel; S R Klein; A G Knospe; A Kocoloski; D D Koetke; T Kollegger; M Kopytine; L Kotchenda; V Kouchpil; K L Kowalik; P Kravtsov; V I Kravtsov; K Krueger; C Kuhn; A Kumar; P Kurnadi; M A C Lamont; J M Landgraf; J Langdon; S Lange; S LaPointe; F Laue; J Lauret; A Lebedev; R Lednicky; C-H Lee; M J LeVine; C Li; Q Li; Y Li; G Lin; X Lin; S J Lindenbaum; M A Lisa; F Liu; H Liu; J Liu; L Liu; T Ljubicic; W J Llope; R S Longacre; W A Love; Y Lu; T Ludlam; D Lynn; G L Ma; J G Ma; Y G Ma; D P Mahapatra; R Majka; L K Mangotra; R Manweiler; S Margetis; C Markert; H S Matis; Yu A Matulenko; T S McShane; A Meschanin; J Millane; C Miller; M L Miller; N G Minaev; S Mioduszewski; A Mischke; J Mitchell; B Mohanty; D A Morozov; M G Munhoz; B K Nandi; C Nattrass; T K Nayak; J M Nelson; C Nepali; P K Netrakanti; M J Ng; L V Nogach; S B Nurushev; G Odyniec; A Ogawa; H Okada; V Okorokov; D Olson; M Pachr; S K Pal; Y Panebratsev; A I Pavlinov; T Pawlak; T Peitzmann; V Perevoztchikov; C Perkins; W Peryt; S C Phatak; M Planinic; J Pluta; N Poljak; N Porile; A M Poskanzer; M Potekhin; B V K S Potukuchi; D Prindle; C Pruneau; N K Pruthi; J Putschke; I A Qattan; G Rakness; R Raniwala; S Raniwala; R L Ray; D Relyea; A Ridiger; H G Ritter; J B Roberts; O V Rogachevskiy; J L Romero; A Rose; C Roy; L Ruan; M J Russcher; V Rykov; R Sahoo; I Sakrejda; T Sakuma; S Salur; J Sandweiss; M Sarsour; J Schambach; R P Scharenberg; N Schmitz; J Seger; I Selyuzhenkov; P Seyboth; A Shabetai; E Shahaliev; M Shao; M Sharma; X-H Shi; E P Sichtermann; F Simon; R N Singaraju; M J Skoby; N Smirnov; R Snellings; P Sorensen; J Sowinski; J Speltz; H M Spinka; B Srivastava; A Stadnik; T D S Stanislaus; D Staszak; R Stock; M Strikhanov; B Stringfellow; A A P Suaide; M C Suarez; N L Subba; M Sumbera; X M Sun; Z Sun; B Surrow; T J M Symons; A Szanto de Toledo; J Takahashi; A H Tang; Z Tang; T Tarnowsky; J Tatarowicz; D Thein; J H Thomas; J Tian; A R Timmins; S Timoshenko; M Tokarev; T A Trainor; V N Tram; A L Trattner; S Trentalange; R E Tribble; O D Tsai; J Ulery; T Ullrich; D G Underwood; G Van Buren; N van der Kolk; M van Leeuwen; A M Vander Molen; R Varma; G M S Vasconcelos; I M Vasilevski; A N Vasiliev; R Vernet; F Videbaek; S E Vigdor; Y P Viyogi; S Vokal; S A Voloshin; M Wada; W T Waggoner; F Wang; G Wang; J S Wang; Q Wang; X Wang; X L Wang; Y Wang; J C Webb; G D Westfall; C Whitten Jr; H Wieman; S W Wissink; R Witt; J Wu; Y Wu; N Xu; Q H Xu; Z Xu; P Yepes; I-K Yoo; Q Yue; N Zachariou; M Zawisza; W Zhan; H Zhang; S Zhang; W M Zhang; Y Zhang; Z P Zhang; Y Zhao; C Zhong; J Zhou; R Zoulkarneev; Y Zoulkarneeva; J X Zuo; STAR Collaboration

doi:10.1103/PhysRevLett.101.222001

Forward neutral-pion transverse single-spin asymmetries in p + p collisions at sqrt[s] = 200 GeV

Phys Rev Lett. 2008 Nov 28;101(22):222001. doi: 10.1103/PhysRevLett.101.222001. Epub 2008 Nov 25.

Authors

B I Abelev¹, M M Aggarwal, Z Ahammed, B D Anderson, D Arkhipkin, G S Averichev, Y Bai, J Balewski, O Barannikova, L S Barnby, J Baudot, S Baumgart, D R Beavis, R Bellwied, F Benedosso, R R Betts, S Bhardwaj, A Bhasin, A K Bhati, H Bichsel, J Bielcik, J Bielcikova, L C Bland, S-L Blyth, M Bombara, B E Bonner, M Botje, J Bouchet, E Braidot, A V Brandin, S Bueltmann, T P Burton, M Bystersky, X Z Cai, H Caines, M Calderón de la Barca Sánchez, J Callner, O Catu, D Cebra, M C Cervantes, Z Chajecki, P Chaloupka, S Chattopadhyay, H F Chen, J H Chen, J Y Chen, J Cheng, M Cherney, A Chikanian, K E Choi, W Christie, S U Chung, R F Clarke, M J M Codrington, J P Coffin, T M Cormier, M R Cosentino, J G Cramer, H J Crawford, D Das, S Dash, M Daugherity, M M de Moura, T G Dedovich, M DePhillips, A A Derevschikov, R Derradi de Souza, L Didenko, T Dietel, P Djawotho, S M Dogra, X Dong, J L Drachenberg, J E Draper, F Du, J C Dunlop, M R Dutta Mazumdar, W R Edwards, L G Efimov, E Elhalhuli, V Emelianov, J Engelage, G Eppley, B Erazmus, M Estienne, L Eun, P Fachini, R Fatemi, J Fedorisin, A Feng, P Filip, E Finch, V Fine, Y Fisyak, J Fu, C A Gagliardi, L Gaillard, M S Ganti, E Garcia-Solis, V Ghazikhanian, P Ghosh, Y N Gorbunov, A Gordon, H Gos, O Grebenyuk, D Grosnick, B Grube, S M Guertin, K S F F Guimaraes, A Gupta, N Gupta, W Guryn, B Haag, T J Hallman, A Hamed, J W Harris, W He, M Heinz, T W Henry, S Heppelmann, B Hippolyte, A Hirsch, E Hjort, A M Hoffman, G W Hoffmann, D J Hofman, R S Hollis, M J Horner, H Z Huang, E W Hughes, T J Humanic, G Igo, A Iordanova, P Jacobs, W W Jacobs, P Jakl, F Jin, P G Jones, E G Judd, S Kabana, K Kajimoto, K Kang, J Kapitan, M Kaplan, D Keane, A Kechechyan, D Kettler, V Yu Khodyrev, J Kiryluk, A Kisiel, S R Klein, A G Knospe, A Kocoloski, D D Koetke, T Kollegger, M Kopytine, L Kotchenda, V Kouchpil, K L Kowalik, P Kravtsov, V I Kravtsov, K Krueger, C Kuhn, A Kumar, P Kurnadi, M A C Lamont, J M Landgraf, J Langdon, S Lange, S LaPointe, F Laue, J Lauret, A Lebedev, R Lednicky, C-H Lee, M J LeVine, C Li, Q Li, Y Li, G Lin, X Lin, S J Lindenbaum, M A Lisa, F Liu, H Liu, J Liu, L Liu, T Ljubicic, W J Llope, R S Longacre, W A Love, Y Lu, T Ludlam, D Lynn, G L Ma, J G Ma, Y G Ma, D P Mahapatra, R Majka, L K Mangotra, R Manweiler, S Margetis, C Markert, H S Matis, Yu A Matulenko, T S McShane, A Meschanin, J Millane, C Miller, M L Miller, N G Minaev, S Mioduszewski, A Mischke, J Mitchell, B Mohanty, D A Morozov, M G Munhoz, B K Nandi, C Nattrass, T K Nayak, J M Nelson, C Nepali, P K Netrakanti, M J Ng, L V Nogach, S B Nurushev, G Odyniec, A Ogawa, H Okada, V Okorokov, D Olson, M Pachr, S K Pal, Y Panebratsev, A I Pavlinov, T Pawlak, T Peitzmann, V Perevoztchikov, C Perkins, W Peryt, S C Phatak, M Planinic, J Pluta, N Poljak, N Porile, A M Poskanzer, M Potekhin, B V K S Potukuchi, D Prindle, C Pruneau, N K Pruthi, J Putschke, I A Qattan, G Rakness, R Raniwala, S Raniwala, R L Ray, D Relyea, A Ridiger, H G Ritter, J B Roberts, O V Rogachevskiy, J L Romero, A Rose, C Roy, L Ruan, M J Russcher, V Rykov, R Sahoo, I Sakrejda, T Sakuma, S Salur, J Sandweiss, M Sarsour, J Schambach, R P Scharenberg, N Schmitz, J Seger, I Selyuzhenkov, P Seyboth, A Shabetai, E Shahaliev, M Shao, M Sharma, X-H Shi, E P Sichtermann, F Simon, R N Singaraju, M J Skoby, N Smirnov, R Snellings, P Sorensen, J Sowinski, J Speltz, H M Spinka, B Srivastava, A Stadnik, T D S Stanislaus, D Staszak, R Stock, M Strikhanov, B Stringfellow, A A P Suaide, M C Suarez, N L Subba, M Sumbera, X M Sun, Z Sun, B Surrow, T J M Symons, A Szanto de Toledo, J Takahashi, A H Tang, Z Tang, T Tarnowsky, J Tatarowicz, D Thein, J H Thomas, J Tian, A R Timmins, S Timoshenko, M Tokarev, T A Trainor, V N Tram, A L Trattner, S Trentalange, R E Tribble, O D Tsai, J Ulery, T Ullrich, D G Underwood, G Van Buren, N van der Kolk, M van Leeuwen, A M Vander Molen, R Varma, G M S Vasconcelos, I M Vasilevski, A N Vasiliev, R Vernet, F Videbaek, S E Vigdor, Y P Viyogi, S Vokal, S A Voloshin, M Wada, W T Waggoner, F Wang, G Wang, J S Wang, Q Wang, X Wang, X L Wang, Y Wang, J C Webb, G D Westfall, C Whitten Jr, H Wieman, S W Wissink, R Witt, J Wu, Y Wu, N Xu, Q H Xu, Z Xu, P Yepes, I-K Yoo, Q Yue, N Zachariou, M Zawisza, W Zhan, H Zhang, S Zhang, W M Zhang, Y Zhang, Z P Zhang, Y Zhao, C Zhong, J Zhou, R Zoulkarneev, Y Zoulkarneeva, J X Zuo; STAR Collaboration

Affiliation

¹ University of Illinois at Chicago, Chicago, Illinois 60607, USA.

PMID: 19113478
DOI: 10.1103/PhysRevLett.101.222001

Abstract

We report precision measurements of the Feynman x (xF) dependence, and first measurements of the transverse momentum (pT) dependence, of transverse single-spin asymmetries for the production of pi0 mesons from polarized proton collisions at sqrt[s] = 200 GeV. The xF dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the pT dependence at fixed xF are not consistent with these same perturbative QCD-based calculations.