Phys. Rev. Lett.
97,
152302
(2006)
[6 pages]
Forward Neutral Pion Production in p+p and d+Au Collisions at √sNN=200 GeV
J. Adams et al. STAR Collaboration
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J. Adams2, M. M. Aggarwal28, Z. Ahammed43, J. Amonett19, B. D. Anderson19, D. Arkhipkin12, G. S. Averichev11, S. K. Badyal18, Y. Bai26, J. Balewski16, O. Barannikova31, L. S. Barnby2, J. Baudot17, S. Bekele27, V. V. Belaga11, A. Bellingeri-Laurikainen38, R. Bellwied46, J. Berger13, B. I. Bezverkhny48, S. Bharadwaj33, A. Bhasin18, A. K. Bhati28, V. S. Bhatia28, H. Bichsel45, J. Bielcik48, J. Bielcikova48, A. Billmeier46, L. C. Bland3, C. O. Blyth2, S-L. Blyth20, B. E. Bonner34, M. Botje26, A. Boucham38, J. Bouchet38, A. V. Brandin24, A. Bravar3, M. Bystersky10, R. V. Cadman1, X. Z. Cai37, H. Caines48, M. Calderón de la Barca Sánchez16, O. Catu48, D. Cebra6, Z. Chajecki27, P. Chaloupka10, S. Chattopadhyay43, H. F. Chen36, J. H. Chen37, Y. Chen7, J. Cheng41, M. Cherney9, A. Chikanian48, H. A. Choi32, W. Christie3, J. P. Coffin17, T. M. Cormier46, M. R. Cosentino35, J. G. Cramer45, H. J. Crawford5, D. Das43, S. Das43, M. Daugherity40, M. M. de Moura35, T. G. Dedovich11, M. DePhillips3, A. A. Derevschikov30, L. Didenko3, T. Dietel13, S. M. Dogra18, W. J. Dong7, X. Dong36, J. E. Draper6, F. Du48, A. K. Dubey14, V. B. Dunin11, J. C. Dunlop3, M. R. Dutta Mazumdar43, V. Eckardt22, W. R. Edwards20, L. G. Efimov11, V. Emelianov24, J. Engelage5, G. Eppley34, B. Erazmus38, M. Estienne38, P. Fachini3, J. Faivre17, R. Fatemi21, J. Fedorisin11, K. Filimonov20, P. Filip10, E. Finch48, V. Fine3, Y. Fisyak3, K. S. F. Fornazier35, B. D. Fox3, J. Fu41, C. A. Gagliardi39, L. Gaillard2, J. Gans48, M. S. Ganti43, F. Geurts34, V. Ghazikhanian7, P. Ghosh43, J. E. Gonzalez7, Y. G. Gorbunov9, H. Gos44, O. Grachov46, O. Grebenyuk26, D. Grosnick42, S. M. Guertin7, Y. Guo46, A. Gupta18, N. Gupta18, T. D. Gutierrez6, T. J. Hallman3, A. Hamed46, J. W. Harris48, M. Heinz48, T. W. Henry39, S. Hepplemann29, B. Hippolyte17, A. Hirsch31, E. Hjort20, G. W. Hoffmann40, M. J. Horner20, H. Z. Huang7, S. L. Huang36, E. W. Hughes4, T. J. Humanic27, G. Igo7, A. Ishihara40, P. Jacobs20, W. W. Jacobs16, H. Jiang7, P. G. Jones2, E. G. Judd5, S. Kabana38, K. Kang41, M. Kaplan8, D. Keane19, A. Kechechyan11, V. Yu. Khodyrev30, B. C. Kim32, J. Kiryluk21, A. Kisiel44, E. M. Kislov11, S. R. Klein20, D. D. Koetke42, T. Kollegger13, M. Kopytine19, L. Kotchenda24, K. L. Kowalik20, M. Kramer25, P. Kravtsov24, V. I. Kravtsov30, K. Krueger1, C. Kuhn17, A. I. Kulikov11, A. Kumar28, R. Kh. Kutuev12, A. A. Kuznetsov11, R. Lamb3, M. A. C. Lamont48, J. M. Landgraf3, S. Lange13, F. Laue3, J. Lauret3, A. Lebedev3, R. Lednicky11, C-H. Lee32, S. Lehocka11, M. J. LeVine3, C. Li36, Q. Li46, Y. Li41, G. Lin48, S. J. Lindenbaum25, M. A. Lisa27, F. Liu47, H. Liu36, J. Liu34, L. Liu47, Q. J. Liu45, Z. Liu47, T. Ljubicic3, W. J. Llope34, H. Long7, R. S. Longacre3, M. Lopez-Noriega27, W. A. Love3, Y. Lu47, T. Ludlam3, D. Lynn3, G. L. Ma37, J. G. Ma7, Y. G. Ma37, D. Magestro27, S. Mahajan18, D. P. Mahapatra14, R. Majka48, L. K. Mangotra18, R. Manweiler42, S. Margetis19, C. Markert19, L. Martin38, J. N. Marx20, H. S. Matis20, Yu. A. Matulenko30, C. J. McClain1, T. S. McShane9, Yu. Melnick30, A. Meschanin30, M. L. Miller21, N. G. Minaev30, C. Mironov19, A. Mischke26, D. K. Mishra14, J. Mitchell34, S. Mioduszewski39, B. Mohanty43, L. Molnar31, C. F. Moore40, D. A. Morozov30, M. G. Munhoz35, B. K. Nandi43, S. K. Nayak18, T. K. Nayak43, J. M. Nelson2, P. K. Netrakanti43, V. A. Nikitin12, L. V. Nogach30, S. B. Nurushev30, G. Odyniec20, A. Ogawa3, V. Okorokov24, M. Oldenburg20, D. Olson20, S. K. Pal43, Y. Panebratsev11, S. Y. Panitkin3, A. I. Pavlinov46, T. Pawlak44, T. Peitzmann26, V. Perevoztchikov3, C. Perkins5, W. Peryt44, V. A. Petrov46, S. C. Phatak14, R. Picha6, M. Planinic49, J. Pluta44, N. Porile31, J. Porter45, A. M. Poskanzer20, M. Potekhin3, E. Potrebenikova11, B. V. K. S. Potukuchi18, D. Prindle45, C. Pruneau46, J. Putschke20, G. Rakness3,29, R. Raniwala33, S. Raniwala33, O. Ravel38, R. L. Ray40, S. V. Razin11, D. Reichhold31, J. G. Reid45, J. Reinnarth38, G. Renault38, F. Retiere20, A. Ridiger24, H. G. Ritter20, J. B. Roberts34, O. V. Rogachevskiy11, J. L. Romero6, A. Rose20, C. Roy38, L. Ruan20, M. J. Russcher26, R. Sahoo14, I. Sakrejda20, S. Salur48, J. Sandweiss48, M. Sarsour39, I. Savin12, P. S. Sazhin11, J. Schambach40, R. P. Scharenberg31, N. Schmitz22, K. Schweda20, J. Seger9, I. Selyuzhenkov46, P. Seyboth22, A. Shabetai20, E. Shahaliev11, M. Shao36, W. Shao4, M. Sharma28, W. Q. Shen37, K. E. Shestermanov30, S. S. Shimanskiy11, E Sichtermann20, F. Simon43, R. N. Singaraju43, N. Smirnov48, R. Snellings26, G. Sood42, P. Sorensen3, J. Sowinski16, J. Speltz17, H. M. Spinka1, B. Srivastava31, A. Stadnik11, T. D. S. Stanislaus42, R. Stock13, A. Stolpovsky46, M. Strikhanov24, B. Stringfellow31, A. A. P. Suaide35, E. Sugarbaker27, M. Sumbera10, B. Surrow21, M. Swanger9, T. J. M. Symons20, A. Szanto de Toledo35, A. Tai7, J. Takahashi35, A. H. Tang26, T. Tarnowsky31, D. Thein7, J. H. Thomas20, A. R. Timmins2, S. Timoshenko24, M. Tokarev11, T. A. Trainor45, S. Trentalange7, R. E. Tribble39, O. D. Tsai7, J. Ulery31, T. Ullrich3, D. G. Underwood1, G. Van Buren3, N. van der Kolk26, M. van Leeuwen20, A. M. Vander Molen23, R. Varma15, I. M. Vasilevski12, A. N. Vasiliev30, R. Vernet17, S. E. Vigdor16, Y. P. Viyogi43, S. Vokal11, S. A. Voloshin46, W. T. Waggoner9, F. Wang31, G. Wang19, G. Wang4, X. L. Wang36, Y. Wang40, Y. Wang41, Z. M. Wang36, H. Ward40, J. W. Watson19, J. C. Webb16, G. D. Westfall23, A. Wetzler20, C. Whitten, Jr.7, H. Wieman20, S. W. Wissink16, R. Witt48, J. Wood7, J. Wu36, N. Xu20, Q. H. Xu20, Z. Xu3, Z. Z. Xu36, P. Yepes34, I-K. Yoo32, V. I. Yurevich11, I. Zborovsky10, H. Zhang3, W. M. Zhang19, Y. Zhang36, Z. P. Zhang36, C. Zhong37, R. Zoulkarneev12, Y. Zoulkarneeva12, A. N. Zubarev11, and J. X. Zuo37 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Birmingham, Birmingham, United Kingdom
3Brookhaven National Laboratory, Upton, New York 11973, USA
4California Institute of Technology, Pasadena, California 91125, USA
5University of California, Berkeley, California 94720, USA
6University of California, Davis, California 95616, USA
7University of California, Los Angeles, California 90095, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Creighton University, Omaha, Nebraska 68178, USA
10Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
11Laboratory for High Energy (JINR), Dubna, Russia
12Particle Physics Laboratory (JINR), Dubna, Russia
13University of Frankfurt, Frankfurt, Germany
14Institute of Physics, Bhubaneswar 751005, India
15Indian Institute of Technology, Mumbai, India
16Indiana University, Bloomington, Indiana 47408, USA
17Institut de Recherches Subatomiques, Strasbourg, France
18University of Jammu, Jammu 180001, India
19Kent State University, Kent, Ohio 44242, USA
20Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
21Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
22Max-Planck-Institut für Physik, Munich, Germany
23Michigan State University, East Lansing, Michigan 48824, USA
24Moscow Engineering Physics Institute, Moscow Russia
25City College of New York, New York City, New York 10031, USA
26NIKHEF and Utrecht University, Amsterdam, The Netherlands
27Ohio State University, Columbus, Ohio 43210, USA
28Panjab University, Chandigarh 160014, India
29Pennsylvania State University, University Park, Pennsylvania 16802, USA
30Institute of High Energy Physics, Protvino, Russia
31Purdue University, West Lafayette, Indiana 47907, USA
32Pusan National University, Pusan, Republic of Korea
33University of Rajasthan, Jaipur 302004, India
34Rice University, Houston, Texas 77251, USA
35Universidade de Sao Paulo, Sao Paulo, Brazil
36University of Science & Technology of China, Hefei 230026, China
37Shanghai Institute of Applied Physics, Shanghai 201800, China
38SUBATECH, Nantes, France
39Texas A&M University, College Station, Texas 77843, USA
40University of Texas, Austin, Texas 78712, USA
41Tsinghua University, Beijing 100084, China
42Valparaiso University, Valparaiso, Indiana 46383, USA
43Variable Energy Cyclotron Centre, Kolkata 700064, India
44Warsaw University of Technology, Warsaw, Poland
45University of Washington, Seattle, Washington 98195, USA
46Wayne State University, Detroit, Michigan 48201, USA
47Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
48Yale University, New Haven, Connecticut 06520, USA
49University of Zagreb, Zagreb, HR-10002, Croatia
Received 9 February 2006; published 11 October 2006
Measurements of the production of forward π0 mesons from p+p and d+Au collisions at √sNN=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 η increases, decreasing to ∼30% of the p+p yield at ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward π0 with charged hadrons at η≈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.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.152302
DOI:
10.1103/PhysRevLett.97.152302
PACS:
24.85.+p, 13.85.Fb, 13.85.Ni, 25.75.Dw
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