Forward Neutral Pion Production In P+P And D+Au Collisions At Root(S)(Nn)=200 Gev

J. Adams,M. Aggarwal, Z. Ahammed,J. Amonett,B. Anderson,D. Arkhipkin,G. Averichev,S. Badyal, Y. Bai,J. Balewski,O. Barannikova,L. Barnby,J. Baudot,S. Bekele,V. Belaga,A. Bellingeri-Laurikainen, R. Bellwied,J. Berger,B. Bezverkhny,S. Bharadwaj,A. Bhasin,A. Bhati,V. Bhatia, H. Bichsel, J. Bielcik, J. Bielcikova,A. Billmeier,L. Bland,C. Blyth,S. L. Blyth,B. Bonner,M. Botje, A. Boucham,J. Bouchet,A. Brandin,A. Bravar,M. Bystersky,R. Cadman,X. Cai, H. Caines, M. Sánchez,O. Catu, D. Cebra,Z. Chajecki,P. Chaloupka,S. Chattopadhyay,H. Chen, J. Chen, Y. Chen,J. Cheng,M. Cherney, A. Chikanian,H. Choi,W. Christie,J. Coffin,T. Cormier,M. Cosentino,J. Cramer,H. Crawford,D. Das,S. Das,M. Daugherity,M. de Moura,T. Dedovich,M. DePhillips,A. Derevschikov,L. Didenko,T. Dietel,S. Dogra,W. Dong, X. Dong,J. Draper,F. Du,A. Dubey,V. Dunin,J. Dunlop,M. Mazumdar,V. Eckardt,W. Edwards,L. Efimov,V. Emelianov,J. Engelage, G. Eppley,B. Erazmus,M. Estienne,P. Fachini,J. Faivre,R. Fatemi,J. Fedorisin,K. Filimonov,P. Filip,E. Finch,V. Fine,Y. Fisyak,K. Fornazier, B. Fox,J. Fu,C. Gagliardi,L. Gaillard,J. Gans,M. Ganti,F. Geurts,V. Ghazikhanian,P. Ghosh,J. Gonzalez,Y. Gorbunov,H. Gos, O. Grachov,O. Grebenyuk,D. Grosnick,S. Guertin, Y. Guo, A. Gupta,N. Gupta,T. Gutierrez,T. Hallman,A. Hamed,J. Harris,M. Heinz,T. Henry,S. Hepplemann, B. Hippolyte, A. Hirsch, E. Hjort,G. Hoffmann,M. Horner,H. Huang,S. Huang,E. Hughes,T. Humanic, G. Igo,A. Ishihara, P. Jacobs,W. Jacobs,H. Jiang, P. Jones,E. Judd, S. Kabana,K. Kang,M. Kaplan,D. Keane,A. Kechechyan,V. Khodyrev, B. Kim,J. Kiryluk,A. Kisiel,E. Kislov,S. Klein,D. Koetke,T. Kollegger,M. Kopytine,L. Kotchenda,K. Kowalik,M. Kramer,P. Kravtsov,V. Kravtsov, K. Krueger,C. Kuhn, A. Kulikov, A. Kumar,R. Kutuev,A. Kuznetsov,R. Lamb,M. Lamont,J. Landgraf,S. Lange,F. Laue, J. Lauret, A. Lebedev, R. Lednicky, C. H. Lee,S. Lehocka,M. LeVine,C. Li,Q. Li, Y. Li, G. Lin,S. Lindenbaum,M. Lisa, F. Liu, H. Liu, J. Liu,L. Liu,Q. Liu,Z. Liu,T. Ljubicic,W. Llope,H. Long,R. Longacre,M. Lopez-Noriega,W. Love,Y. Lu,T. Ludlam, D. Lynn,G. Ma,J. Ma,Y. Ma,D. Magestro,S. Mahajan,D. Mahapatra,R. Majka,L. Mangotra,R. Manweiler,S. Margetis, C. Markert,L. Martin,J. Marx,H. Matis,Yu. Matulenko,C. McClain,T. McShane,Yu. Melnick, A. Meschanin,M. Miller,N. Minaev, C. Mironov, A. Mischke,D. Mishra,J. Mitchell,S. Mioduszewski, B. Mohanty,L. Molnar,C. Moore,D. Morozov,M. Munhoz,B. Nandi,S. Nayak,T. Nayak,J. Nelson,P. Netrakanti, V. Nikitin,L. Nogach,S. Nurushev, G. Odyniec,A. Ogawa,V. Okorokov,M. Oldenburg, D. Olson,S. Pal,Y. Panebratsev, S. Panitkin,A. Pavlinov,T. Pawlak, T. Peitzmann,V. Perevoztchikov,C. Perkins, W. Peryt,V. Petrov,S. Phatak,R. Picha,M. Planinic, J. Pluta,N. Porile,J. Porter,A. Poskanzer,M. Potekhin,E. Potrebenikova,B. Potukuchi,D. Prindle, C. Pruneau, J. Putschke, G. Rakness, R. Raniwala, S. Raniwala,O. Ravel,R. Ray,S. Razin,D. Reichhold,J. Reid,J. Reinnarth, G. Renault,F. Retiere,A. Ridiger,H. Ritter,J. Roberts,O. Rogachevskiy, J. Romero, A. Rose, C. Roy,L. Ruan,M. Russcher,R. Sahoo,I. Sakrejda, S. Salur,J. Sandweiss,M. Sarsour, I. Savin,P. Sazhin,J. Schambach,R. Scharenberg,N. Schmitz,K. Schweda,J. Seger,I. Selyuzhenkov,P. Seyboth,A. Shabetai,E. Shahaliev,M. Shao,W. Shao,M. Sharma,W. Shen,K. Shestermanov,S. Shimanskiy,E Sichtermann,F. Simon,R. Singaraju, N. Smirnov, R. Snellings,G. Sood,P. Sorensen, J. Sowinski,J. Speltz,H. Spinka, B. Srivastava,A. Stadnik,T. Stanislaus,R. Stock,A. Stolpovsky,M. Strikhanov,B. Stringfellow,A. Suaide, E. Sugarbaker, M. Sumbera,B. Surrow,M. Swanger,T. Symons,A. de Toledo,A. Tai, J. Takahashi,A. Tang,T. Tarnowsky,D. Thein,J. Thomas,A. Timmins,S. Timoshenko,M. Tokarev,T. Trainor,S. Trentalange,R. Tribble,O. Tsai,J. Ulery,T. Ullrich,D. Underwood,G. Buren,N. van der Kolk,M. van Leeuwen,A. Molen,R. Varma,I. Vasilevski,A. Vasiliev,R. Vernet,S. Vigdor,Y. Viyogi,S. Vokal,S. Voloshin,W. Waggoner, F. Wang,G. Wang,X. Wang,Y. Wang, Z. Wang,H. Ward,J. Watson,J. Webb,G. Westfall,A. Wetzler,C. Whitten,H. Wieman,S. Wissink,R. Witt,J. Wood,J. Wu,N. Xu,Q. Xu,Z. Xu,P. Yepes,I. K. Yoo,V. Yurevich,I. Zborovsky,H. Zhang, W. Zhang,Y. Zhang,Z. Zhang, C. Zhong,R. Zoulkarneev,Y. Zoulkarneeva,A. Zubarev,J. Zuo

PHYSICAL REVIEW LETTERS（2006）

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摘要

Measurements of the production of forward pi(0) mesons from p+p and d+Au collisions at root s(NN) = 200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as eta increases, decreasing to similar to 30% of the p+p yield at =4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward pi(0) with charged hadrons at eta approximate to 0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.

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