Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at sqrt[s]=200 GeV

J Adams; C Adler; M M Aggarwal; Z Ahammed; J Amonett; B D Anderson; M Anderson; D Arkhipkin; G S Averichev; S K Badyal; J Balewski; O Barannikova; L S Barnby; J Baudot; S Bekele; V V Belaga; R Bellwied; J Berger; B I Bezverkhny; S Bhardwaj; P Bhaskar; A K Bhati; H Bichsel; A Billmeier; L C Bland; C O Blyth; B E Bonner; M Botje; A Boucham; A Brandin; A Bravar; R V Cadman; X Z Cai; H Caines; M Calderón de la Barca Sánchez; J Carroll; J Castillo; M Castro; D Cebra; P Chaloupka; S Chattopadhyay; H F Chen; Y Chen; S P Chernenko; M Cherney; A Chikanian; B Choi; W Christie; J P Coffin; T M Cormier; J G Cramer; H J Crawford; D Das; S Das; A A Derevschikov; L Didenko; T Dietel; W J Dong; X Dong; J E Draper; F Du; A K Dubey; V B Dunin; J C Dunlop; M R Dutta Majumdar; V Eckardt; L G Efimov; V Emelianov; J Engelage; G Eppley; B Erazmus; M Estienne; P Fachini; V Faine; J Faivre; R Fatemi; K Filimonov; P Filip; E Finch; Y Fisyak; D Flierl; K J Foley; J Fu; C A Gagliardi; N Gagunashvili; J Gans; M S Ganti; L Gaudichet; M Germain; F Geurts; V Ghazikhanian; P Ghosh; J E Gonzalez; O Grachov; V Grigoriev; S Gronstal; D Grosnick; M Guedon; S M Guertin; A Gupta; E Gushin; T D Gutierrez; T J Hallman; D Hardtke; J W Harris; M Heinz; T W Henry; S Heppelmann; T Herston; B Hippolyte; A Hirsch; E Hjort; G W Hoffmann; M Horsley; H Z Huang; S L Huang; T J Humanic; G Igo; A Ishihara; P Jacobs; W W Jacobs; M Janik; H Jiang; I Johnson; P G Jones; E G Judd; S Kabana; M Kaneta; M Kaplan; D Keane; V Yu Khodyrev; J Kiryluk; A Kisiel; J Klay; S R Klein; A Klyachko; D D Koetke; T Kollegger; M Kopytine; L Kotchenda; A D Kovalenko; M Kramer; P Kravtsov; V I Kravtsov; K Krueger; C Kuhn; A I Kulikov; A Kumar; G J Kunde; C L Kunz; R Kh Kutuev; A A Kuznetsov; M A C Lamont; J M Landgraf; S Lange; C P Lansdell; B Lasiuk; F Laue; J Lauret; A Lebedev; R Lednický; M J LeVine; C Li; Q Li; S J Lindenbaum; M A Lisa; F Liu; L Liu; Z Liu; Q J Liu; T Ljubicic; W J Llope; H Long; R S Longacre; M Lopez-Noriega; W A Love; T Ludlam; D Lynn; J Ma; Y G Ma; D Magestro; S Mahajan; L K Mangotra; D P Mahapatra; R Majka; R Manweiler; S Margetis; C Markert; L Martin; J Marx; H S Matis; Yu A Matulenko; T S McShane; F Meissner; Yu Melnick; A Meschanin; M Messer; M L Miller; Z Milosevich; N G Minaev; C Mironov; D Mishra; J Mitchell; B Mohanty; L Molnar; C F Moore; M J Mora-Corral; D A Morozov; V Morozov; M M de Moura; M G Munhoz; B K Nandi; S K Nayak; T K Nayak; J M Nelson; P Nevski; V A Nikitin; L V Nogach; B Norman; S B Nurushev; G Odyniec; A Ogawa; V Okorokov; M Oldenburg; D Olson; G Paic; S U Pandey; S K Pal; Y Panebratsev; S Y Panitkin; A I Pavlinov; T Pawlak; V Perevoztchikov; C Perkins; W Peryt; V A Petrov; S C Phatak; R Picha; M Planinic; J Pluta; N Porile; J Porter; A M Poskanzer; M Potekhin; E Potrebenikova; B V K S Potukuchi; D Prindle; C Pruneau; J Putschke; G Rai; G Rakness; R Raniwala; S Raniwala; O Ravel; R L Ray; S V Razin; D Reichhold; J G Reid; G Renault; F Retiere; A Ridiger; H G Ritter; J B Roberts; O V Rogachevski; J L Romero; A Rose; C Roy; L J Ruan; R Sahoo; I Sakrejda; S Salur; J Sandweiss; I Savin; J Schambach; R P Scharenberg; N Schmitz; L S Schroeder; K Schweda; J Seger; D Seliverstov; P Seyboth; E Shahaliev; M Shao; M Sharma; K E Shestermanov; S S Shimanskii; R N Singaraju; F Simon; G Skoro; N Smirnov; R Snellings; G Sood; P Sorensen; J Sowinski; H M Spinka; B Srivastava; S Stanislaus; R Stock; A Stolpovsky; M Strikhanov; B Stringfellow; C Struck; A A P Suaide; E Sugarbaker; C Suire; M Sumbera; B Surrow; T J M Symons; A Szanto de Toledo; P Szarwas; A Tai; J Takahashi; A H Tang; D Thein; J H Thomas; V Tikhomirov; M Tokarev; M B Tonjes; T A Trainor; S Trentalange; R E Tribble; M D Trivedi; V Trofimov; O Tsai; T Ullrich; D G Underwood; G Van Buren; A M VanderMolen; A N Vasiliev; M Vasiliev; S E Vigdor; Y P Viyogi; S A Voloshin; W Waggoner; F Wang; G Wang; X L Wang; Z M Wang; H Ward; J W Watson; R Wells; G D Westfall; C Whitten Jr; H Wieman; R Willson; S W Wissink; R Witt; J Wood; J Wu; N Xu; Z Xu; Z Z Xu; E Yamamoto; P Yepes; V I Yurevich; Y V Zanevski; I Zborovský; H Zhang; W M Zhang; Z P Zhang; P A Zołnierczuk; R Zoulkarneev; J Zoulkarneeva; A N Zubarev; STAR Collaboration

doi:10.1103/PhysRevLett.92.171801

Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at sqrt[s]=200 GeV

Phys Rev Lett. 2004 Apr 30;92(17):171801. doi: 10.1103/PhysRevLett.92.171801. Epub 2004 Apr 29.

Authors

J Adams¹, C Adler, M M Aggarwal, Z Ahammed, J Amonett, B D Anderson, M Anderson, D Arkhipkin, G S Averichev, S K Badyal, J Balewski, O Barannikova, L S Barnby, J Baudot, S Bekele, V V Belaga, R Bellwied, J Berger, B I Bezverkhny, S Bhardwaj, P Bhaskar, A K Bhati, H Bichsel, A Billmeier, L C Bland, C O Blyth, B E Bonner, M Botje, A Boucham, A Brandin, A Bravar, R V Cadman, X Z Cai, H Caines, M Calderón de la Barca Sánchez, J Carroll, J Castillo, M Castro, D Cebra, P Chaloupka, S Chattopadhyay, H F Chen, Y Chen, S P Chernenko, M Cherney, A Chikanian, B Choi, W Christie, J P Coffin, T M Cormier, J G Cramer, H J Crawford, D Das, S Das, A A Derevschikov, L Didenko, T Dietel, W J Dong, X Dong, J E Draper, F Du, A K Dubey, V B Dunin, J C Dunlop, M R Dutta Majumdar, V Eckardt, L G Efimov, V Emelianov, J Engelage, G Eppley, B Erazmus, M Estienne, P Fachini, V Faine, J Faivre, R Fatemi, K Filimonov, P Filip, E Finch, Y Fisyak, D Flierl, K J Foley, J Fu, C A Gagliardi, N Gagunashvili, J Gans, M S Ganti, L Gaudichet, M Germain, F Geurts, V Ghazikhanian, P Ghosh, J E Gonzalez, O Grachov, V Grigoriev, S Gronstal, D Grosnick, M Guedon, S M Guertin, A Gupta, E Gushin, T D Gutierrez, T J Hallman, D Hardtke, J W Harris, M Heinz, T W Henry, S Heppelmann, T Herston, B Hippolyte, A Hirsch, E Hjort, G W Hoffmann, M Horsley, H Z Huang, S L Huang, T J Humanic, G Igo, A Ishihara, P Jacobs, W W Jacobs, M Janik, H Jiang, I Johnson, P G Jones, E G Judd, S Kabana, M Kaneta, M Kaplan, D Keane, V Yu Khodyrev, J Kiryluk, A Kisiel, J Klay, S R Klein, A Klyachko, D D Koetke, T Kollegger, M Kopytine, L Kotchenda, A D Kovalenko, M Kramer, P Kravtsov, V I Kravtsov, K Krueger, C Kuhn, A I Kulikov, A Kumar, G J Kunde, C L Kunz, R Kh Kutuev, A A Kuznetsov, M A C Lamont, J M Landgraf, S Lange, C P Lansdell, B Lasiuk, F Laue, J Lauret, A Lebedev, R Lednický, M J LeVine, C Li, Q Li, S J Lindenbaum, M A Lisa, F Liu, L Liu, Z Liu, Q J Liu, T Ljubicic, W J Llope, H Long, R S Longacre, M Lopez-Noriega, W A Love, T Ludlam, D Lynn, J Ma, Y G Ma, D Magestro, S Mahajan, L K Mangotra, D P Mahapatra, R Majka, R Manweiler, S Margetis, C Markert, L Martin, J Marx, H S Matis, Yu A Matulenko, T S McShane, F Meissner, Yu Melnick, A Meschanin, M Messer, M L Miller, Z Milosevich, N G Minaev, C Mironov, D Mishra, J Mitchell, B Mohanty, L Molnar, C F Moore, M J Mora-Corral, D A Morozov, V Morozov, M M de Moura, M G Munhoz, B K Nandi, S K Nayak, T K Nayak, J M Nelson, P Nevski, V A Nikitin, L V Nogach, B Norman, S B Nurushev, G Odyniec, A Ogawa, V Okorokov, M Oldenburg, D Olson, G Paic, S U Pandey, S K Pal, Y Panebratsev, S Y Panitkin, A I Pavlinov, T Pawlak, V Perevoztchikov, C Perkins, W Peryt, V A Petrov, S C Phatak, R Picha, M Planinic, J Pluta, N Porile, J Porter, A M Poskanzer, M Potekhin, E Potrebenikova, B V K S Potukuchi, D Prindle, C Pruneau, J Putschke, G Rai, G Rakness, R Raniwala, S Raniwala, O Ravel, R L Ray, S V Razin, D Reichhold, J G Reid, G Renault, F Retiere, A Ridiger, H G Ritter, J B Roberts, O V Rogachevski, J L Romero, A Rose, C Roy, L J Ruan, R Sahoo, I Sakrejda, S Salur, J Sandweiss, I Savin, J Schambach, R P Scharenberg, N Schmitz, L S Schroeder, K Schweda, J Seger, D Seliverstov, P Seyboth, E Shahaliev, M Shao, M Sharma, K E Shestermanov, S S Shimanskii, R N Singaraju, F Simon, G Skoro, N Smirnov, R Snellings, G Sood, P Sorensen, J Sowinski, H M Spinka, B Srivastava, S Stanislaus, R Stock, A Stolpovsky, M Strikhanov, B Stringfellow, C Struck, A A P Suaide, E Sugarbaker, C Suire, M Sumbera, B Surrow, T J M Symons, A Szanto de Toledo, P Szarwas, A Tai, J Takahashi, A H Tang, D Thein, J H Thomas, V Tikhomirov, M Tokarev, M B Tonjes, T A Trainor, S Trentalange, R E Tribble, M D Trivedi, V Trofimov, O Tsai, T Ullrich, D G Underwood, G Van Buren, A M VanderMolen, A N Vasiliev, M Vasiliev, S E Vigdor, Y P Viyogi, S A Voloshin, W Waggoner, F Wang, G Wang, X L Wang, Z M Wang, H Ward, J W Watson, R Wells, G D Westfall, C Whitten Jr, H Wieman, R Willson, S W Wissink, R Witt, J Wood, J Wu, N Xu, Z Xu, Z Z Xu, E Yamamoto, P Yepes, V I Yurevich, Y V Zanevski, I Zborovský, H Zhang, W M Zhang, Z P Zhang, P A Zołnierczuk, R Zoulkarneev, J Zoulkarneeva, A N Zubarev; STAR Collaboration

Affiliation

¹ University of Birmingham, Birmingham, United Kingdom.

PMID: 15169138
DOI: 10.1103/PhysRevLett.92.171801

Abstract

Measurements of the production of forward high-energy pi(0) mesons from transversely polarized proton collisions at sqrt[s]=200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at x(F) below about 0.3, and becomes positive and large at higher x(F), similar to the trend in data at sqrt[s]< or =20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with p(T)>1 GeV/c at a polarized proton collider.