Phys. Rev. C
76,
054903
(2007)
[13 pages]
Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at √sNN=200 GeV
B. I. Abelev et al. STAR Collaboration
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B. I. Abelev50, J. Adams2, M. M. Aggarwal30, Z. Ahammed45, J. Amonett20, B. D. Anderson20, M. Anderson6, D. Arkhipkin13, G. S. Averichev12, Y. Bai28, J. Balewski17, O. Barannikova9, L. S. Barnby2, J. Baudot18, S. Bekele29, V. V. Belaga12, A. Bellingeri-Laurikainen40, R. Bellwied48, F. Benedosso28, S. Bhardwaj35, A. Bhasin19, A. K. Bhati30, H. Bichsel47, J. Bielcik50, J. Bielcikova50, L. C. Bland3, S.-L. Blyth22, B. E. Bonner36, M. Botje28, J. Bouchet40, A. V. Brandin26, A. Bravar3, M. Bystersky11, R. V. Cadman1, X. Z. Cai39, H. Caines50, M. Calderón de la Barca Sánchez6, J. Castillo28, O. Catu50, D. Cebra6, Z. Chajecki29, P. Chaloupka11, S. Chattopadhyay45, H. F. Chen38, J. H. Chen39, J. Cheng43, M. Cherney10, A. Chikanian50, W. Christie3, J. P. Coffin18, T. M. Cormier48, M. R. Cosentino37, J. G. Cramer47, H. J. Crawford5, D. Das45, S. Das45, M. Daugherity42, M. M. de Moura37, T. G. Dedovich12, M. DePhillips3, A. A. Derevschikov32, L. Didenko3, T. Dietel14, P. Djawotho17, S. M. Dogra19, W. J. Dong7, X. Dong38, J. E. Draper6, F. Du50, V. B. Dunin12, J. C. Dunlop3, M. R. Dutta Mazumdar45, V. Eckardt24, W. R. Edwards22, L. G. Efimov12, V. Emelianov26, J. Engelage5, G. Eppley36, B. Erazmus40, M. Estienne18, P. Fachini3, R. Fatemi23, J. Fedorisin12, K. Filimonov22, P. Filip13, E. Finch50, V. Fine3, Y. Fisyak3, J. Fu49, C. A. Gagliardi41, L. Gaillard2, M. S. Ganti45, V. Ghazikhanian7, P. Ghosh45, J. E. Gonzalez7, Y. G. Gorbunov10, H. Gos46, O. Grebenyuk28, D. Grosnick44, S. M. Guertin7, K. S. F. F. Guimaraes37, Y. Guo48, N. Gupta19, T. D. Gutierrez6, B. Haag6, T. J. Hallman3, A. Hamed48, J. W. Harris50, W. He17, M. Heinz50, T. W. Henry41, S. Hepplemann31, B. Hippolyte18, A. Hirsch33, E. Hjort22, A. M. Hoffman23, G. W. Hoffmann42, M. J. Horner22, H. Z. Huang7, S. L. Huang38, E. W. Hughes4, T. J. Humanic29, G. Igo7, P. Jacobs22, W. W. Jacobs17, P. Jakl11, F. Jia21, H. Jiang7, P. G. Jones2, E. G. Judd5, S. Kabana40, K. Kang43, J. Kapitan11, M. Kaplan8, D. Keane20, A. Kechechyan12, V. Yu. Khodyrev32, B. C. Kim34, J. Kiryluk23, A. Kisiel46, E. M. Kislov12, S. R. Klein22, A. Kocoloski23, D. D. Koetke44, T. Kollegger14, M. Kopytine20, L. Kotchenda26, V. Kouchpil11, K. L. Kowalik22, M. Kramer27, P. Kravtsov26, V. I. Kravtsov32, K. Krueger1, C. Kuhn18, A. I. Kulikov12, A. Kumar30, A. A. Kuznetsov12, M. A. C. Lamont50, J. M. Landgraf3, S. Lange14, S. LaPointe48, F. Laue3, J. Lauret3, A. Lebedev3, R. Lednicky13, C.-H. Lee34, S. Lehocka12, M. J. LeVine3, C. Li38, Q. Li48, Y. Li43, G. Lin50, X. Lin49, S. J. Lindenbaum27, M. A. Lisa29, F. Liu49, H. Liu38, J. Liu36, L. Liu49, Z. Liu49, T. Ljubicic3, W. J. Llope36, H. Long7, R. S. Longacre3, M. Lopez-Noriega29, W. A. Love3, Y. Lu49, T. Ludlam3, D. Lynn3, G. L. Ma39, J. G. Ma7, Y. G. Ma39, D. Magestro29, D. P. Mahapatra15, R. Majka50, L. K. Mangotra19, R. Manweiler44, S. Margetis20, C. Markert42, L. Martin40, H. S. Matis22, Yu. A. Matulenko32, C. J. McClain1, T. S. McShane10, Yu. Melnick32, A. Meschanin32, J. Millane23, M. L. Miller23, N. G. Minaev32, S. Mioduszewski41, C. Mironov20, A. Mischke28, D. K. Mishra15, J. Mitchell36, B. Mohanty22, L. Molnar33, C. F. Moore42, D. A. Morozov32, M. G. Munhoz37, B. K. Nandi16, C. Nattrass50, T. K. Nayak45, J. M. Nelson2, P. K. Netrakanti45, V. A. Nikitin13, L. V. Nogach32, S. B. Nurushev32, G. Odyniec22, A. Ogawa3, V. Okorokov26, M. Oldenburg22, D. Olson22, M. Pachr11, S. K. Pal45, Y. Panebratsev12, S. Y. Panitkin3, A. I. Pavlinov48, T. Pawlak46, T. Peitzmann28, V. Perevoztchikov3, C. Perkins5, W. Peryt46, V. A. Petrov48, S. C. Phatak15, R. Picha6, M. Planinic51, J. Pluta46, N. Poljak51, N. Porile33, J. Porter47, A. M. Poskanzer22, M. Potekhin3, E. Potrebenikova12, B. V. K. S. Potukuchi19, D. Prindle47, C. Pruneau48, J. Putschke22, G. Rakness31, R. Raniwala35, S. Raniwala35, R. L. Ray42, S. V. Razin12, J. Reinnarth40, D. Relyea4, F. Retiere22, A. Ridiger26, H. G. Ritter22, J. B. Roberts36, O. V. Rogachevskiy12, J. L. Romero6, A. Rose22, C. Roy40, L. Ruan22, M. J. Russcher28, R. Sahoo15, T. Sakuma23, S. Salur50, J. Sandweiss50, M. Sarsour41, P. S. Sazhin12, J. Schambach42, R. P. Scharenberg33, N. Schmitz24, K. Schweda22, J. Seger10, I. Selyuzhenkov48, P. Seyboth24, A. Shabetai22, E. Shahaliev12, M. Shao38, M. Sharma30, W. Q. Shen39, S. S. Shimanskiy12, E. Sichtermann22, F. Simon23, R. N. Singaraju45, N. Smirnov50, R. Snellings28, G. Sood44, P. Sorensen3, J. Sowinski17, J. Speltz18, H. M. Spinka1, B. Srivastava33, A. Stadnik12, T. D. S. Stanislaus44, R. Stock14, A. Stolpovsky48, M. Strikhanov26, B. Stringfellow33, A. A. P. Suaide37, E. Sugarbaker29, M. Sumbera11, Z. Sun21, B. Surrow23, M. Swanger10, T. J. M. Symons22, A. Szanto de Toledo37, A. Tai7, J. Takahashi37, A. H. Tang3, T. Tarnowsky33, D. Thein7, J. H. Thomas22, A. R. Timmins2, S. Timoshenko26, M. Tokarev12, T. A. Trainor47, S. Trentalange7, R. E. Tribble41, O. D. Tsai7, J. Ulery33, T. Ullrich3, D. G. Underwood1, G. Van Buren3, N. van der Kolk28, M. van Leeuwen22, A. M. Vander Molen25, R. Varma16, I. M. Vasilevski13, A. N. Vasiliev32, R. Vernet18, S. E. Vigdor17, Y. P. Viyogi15, S. Vokal12, S. A. Voloshin48, W. T. Waggoner10, F. Wang33, G. Wang7, J. S. Wang21, X. L. Wang38, Y. Wang43, J. W. Watson20, J. C. Webb44, G. D. Westfall25, A. Wetzler22, C. Whitten Jr.7, H. Wieman22, S. W. Wissink17, R. Witt50, J. Wood7, J. Wu38, N. Xu22, Q. H. Xu22, Z. Xu3, P. Yepes36, I.-K. Yoo34, V. I. Yurevich12, W. Zhan21, H. Zhang3, W. M. Zhang20, Y. Zhang38, Z. P. Zhang38, Y. Zhao38, C. Zhong39, R. Zoulkarneev13, Y. Zoulkarneeva13, A. N. Zubarev12, and J. X. Zuo39 (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
9University of Illinois, Chicago, USA
10Creighton University, Omaha, Nebraska 68178, USA
11Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
12Laboratory for High Energy (JINR), Dubna, Russia
13Particle Physics Laboratory (JINR), Dubna, Russia
14University of Frankfurt, Frankfurt, Germany
15Institute of Physics, Bhubaneswar 751 005, India
16Indian Institute of Technology, Mumbai, India
17Indiana University, Bloomington, Indiana 47408, USA
18Institut de Recherches Subatomiques, Strasbourg, France
19University of Jammu, Jammu 180 001, India
20Kent State University, Kent, Ohio 44242, USA
21Institute of Modern Physics, Lanzhou, People's Republic of China
22Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
23Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
24Max-Planck-Institut für Physik, Munich, Germany
25Michigan State University, East Lansing, Michigan 48824, USA
26Moscow Engineering Physics Institute, Moscow Russia
27City College of New York, New York City, New York 10031, USA
28NIKHEF and Utrecht University, Amsterdam, The Netherlands
29Ohio State University, Columbus, Ohio 43210, USA
30Panjab University, Chandigarh 160 014, India
31Pennsylvania State University, University Park, Pennsylvania 16802, USA
32Institute of High Energy Physics, Protvino, Russia
33Purdue University, West Lafayette, Indiana 47907, USA
34Pusan National University, Pusan, Republic of Korea
35University of Rajasthan, Jaipur 302 004, India
36Rice University, Houston, Texas 77251, USA
37Universidade de Sao Paulo, Sao Paulo, Brazil
38University of Science & Technology of China, Hefei 230026, People's Republic of China
39Shanghai Institute of Applied Physics, Shanghai 201800, People's Republic of China
40SUBATECH, Nantes, France
41Texas A&M University, College Station, Texas 77843, USA
42University of Texas, Austin, Texas 78712, USA
43Tsinghua University, Beijing 100084, People's Republic of China
44Valparaiso University, Valparaiso, Indiana 46383, USA
45Variable Energy Cyclotron Centre, Kolkata 700 064, India
46Warsaw University of Technology, Warsaw, Poland
47University of Washington, Seattle, Washington 98195, USA
48Wayne State University, Detroit, Michigan 48201, USA
49Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, People's Republic of China
50Yale University, New Haven, Connecticut 06520, USA
51University of Zagreb, Zagreb, HR-10002, Croatia
Received 14 September 2006; published 5 November 2007
We determine rapidity asymmetry in the production of charged pions, protons, and antiprotons for large transverse momentum (pT) for d+Au collisions at √sNN=200 GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity (Au beam direction) to those at forward rapidity (d beam direction). The identified hadrons are measured in the rapidity regions |y|<0.5 and 0.5<|y|<1.0 for the pT range 2.5<pT<10 GeV/c. We observe significant rapidity asymmetry for charged pion and proton+antiproton production in both the rapidity regions. The asymmetry is larger for 0.5<|y|<1.0 than for |y|<0.5 and is almost independent of particle type. The measurements are compared to various model predictions employing multiple scattering, energy loss, nuclear shadowing, saturation effects, and recombination and also to a phenomenological parton model. We find that asymmetries are sensitive to model parameters and show model preference. The rapidity dependence of π-/π+ and p̅ /p ratios in peripheral d+Au and forward neutron-tagged events are used to study the contributions of valence quarks and gluons to particle production at high pT.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.054903
DOI:
10.1103/PhysRevC.76.054903
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