Phys. Rev. Lett. 86, 3963 - 3968 (2001)
Production of χc1 and χc2 in pp̅ Collisions at sqrt[s] = 1.8 TeV
T. Affolder et al. (CDF Collaboration)
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T. Affolder23, H. Akimoto45, A. Akopian38, M. G. Albrow11, P. Amaral8, S. R. Amendolia34, D. Amidei26, K. Anikeev24, J. Antos1, G. Apollinari11, T. Arisawa45, T. Asakawa43, W. Ashmanskas8, F. Azfar31, P. Azzi-Bacchetta32, N. Bacchetta32, M. W. Bailey28, S. Bailey16, P. de Barbaro37, A. Barbaro-Galtieri23, V. E. Barnes36, B. A. Barnett19, S. Baroiant5, M. Barone13, G. Bauer24, F. Bedeschi34, S. Belforte42, W. H. Bell15, G. Bellettini34, J. Bellinger46, D. Benjamin10, J. Bensinger4, A. Beretvas11, J. P. Berge11, J. Berryhill8, B. Bevensee33, A. Bhatti38, M. Binkley11, D. Bisello32, M. Bishai11, R. E. Blair2, C. Blocker4, K. Bloom26, B. Blumenfeld19, S. R. Blusk37, A. Bocci34, A. Bodek37, W. Bokhari33, G. Bolla36, Y. Bonushkin6, D. Bortoletto36, J. Boudreau35, A. Brandl28, S. van den Brink19, C. Bromberg27, M. Brozovic10, N. Bruner28, E. Buckley-Geer11, J. Budagov9, H. S. Budd37, K. Burkett16, G. Busetto32, A. Byon-Wagner11, K. L. Byrum2, P. Calafiura23, M. Campbell26, W. Carithers23, J. Carlson26, D. Carlsmith46, W. Caskey5, J. Cassada37, A. Castro32, D. Cauz42, A. Cerri34, A. W. Chan1, P. S. Chang1, P. T. Chang1, J. Chapman26, C. Chen33, Y. C. Chen1, M.-T. Cheng1, M. Chertok40, G. Chiarelli34, I. Chirikov-Zorin9, G. Chlachidze9, F. Chlebana11, L. Christofek18, M. L. Chu1, Y. S. Chung37, C. I. Ciobanu29, A. G. Clark14, A. Connolly23, J. Conway39, M. Cordelli13, J. Cranshaw41, D. Cronin-Hennessy10, R. Cropp25,25b, R. Culbertson11, D. Dagenhart44, S. D'Auria15, F. DeJongh11, S. Dell'Agnello13, M. Dell'Orso34, L. Demortier38, M. Deninno3, P. F. Derwent11, T. Devlin39, J. R. Dittmann11, S. Donati34, J. Done40, T. Dorigo16, N. Eddy18, K. Einsweiler23, J. E. Elias11, E. Engels, Jr.35, R. Erbacher11, D. Errede18, S. Errede18, Q. Fan37, R. G. Feild47, J. P. Fernandez11, C. Ferretti34, R. D. Field12, I. Fiori3, B. Flaugher11, G. W. Foster11, M. Franklin16, J. Freeman11, J. Friedman24, Y. Fukui22, I. Furic24, S. Galeotti34, M. Gallinaro38, T. Gao33, M. Garcia-Sciveres23, A. F. Garfinkel36, P. Gatti32, C. Gay47, D. W. Gerdes26, P. Giannetti34, P. Giromini13, V. Glagolev9, D. Glenzinski11, M. Gold28, J. Goldstein11, A. Gordon16, I. Gorelov28, A. T. Goshaw10, Y. Gotra35, K. Goulianos38, C. Green36, G. Grim5, P. Gris11, L. Groer39, C. Grosso-Pilcher8, M. Guenther36, G. Guillian26, J. Guimaraes da Costa16, R. M. Haas12, C. Haber23, E. Hafen24, S. R. Hahn11, C. Hall16, T. Handa17, R. Handler46, W. Hao41, F. Happacher13, K. Hara43, A. D. Hardman36, R. M. Harris11, F. Hartmann20, K. Hatakeyama38, J. Hauser6, J. Heinrich33, A. Heiss20, M. Herndon19, C. Hill5, K. D. Hoffman36, C. Holck33, R. Hollebeek33, L. Holloway18, R. Hughes29, J. Huston27, J. Huth16, H. Ikeda43, J. Incandela11, G. Introzzi34, J. Iwai45, Y. Iwata17, E. James26, H. Jensen11, M. Jones33, U. Joshi11, H. Kambara14, T. Kamon40, T. Kaneko43, K. Karr44, H. Kasha47, Y. Kato30, T. A. Keaffaber36, K. Kelley24, M. Kelly26, R. D. Kennedy11, R. Kephart11, D. Khazins10, T. Kikuchi43, B. Kilminster37, B. J. Kim21,21b,21c, D. H. Kim21,21b,21c, H. S. Kim18, M. J. Kim21,21b,21c, S. H. Kim43, Y. K. Kim23, M. Kirby10, M. Kirk4, L. Kirsch4, S. Klimenko12, P. Koehn29, A. Köngeter20, K. Kondo45, J. Konigsberg12, K. Kordas25,25b, A. Korn24, A. Korytov12, E. Kovacs2, J. Kroll33, M. Kruse37, S. E. Kuhlmann2, K. Kurino17, T. Kuwabara43, A. T. Laasanen36, N. Lai8, S. Lami38, S. Lammel11, J. I. Lamoureux4, J. Lancaster10, M. Lancaster23, R. Lander5, G. Latino34, T. LeCompte2, A. M. Lee, IV10, K. Lee41, S. Leone34, J. D. Lewis11, M. Lindgren6, T. M. Liss18, J. B. Liu37, Y. C. Liu1, N. Lockyer33, J. Loken31, M. Loreti32, D. Lucchesi32, P. Lukens11, S. Lusin46, L. Lyons31, J. Lys23, R. Madrak16, K. Maeshima11, P. Maksimovic16, L. Malferrari3, M. Mangano34, M. Mariotti32, G. Martignon32, A. Martin47, J. A. J. Matthews28, J. Mayer25,25b, P. Mazzanti3, K. S. McFarland37, P. McIntyre40, E. McKigney33, M. Menguzzato32, A. Menzione34, C. Mesropian38, A. Meyer11, T. Miao11, R. Miller27, J. S. Miller26, H. Minato43, S. Miscetti13, M. Mishina22, G. Mitselmakher12, N. Moggi3, E. Moore28, R. Moore26, Y. Morita22, T. Moulik24, M. Mulhearn24, A. Mukherjee11, T. Muller20, A. Munar34, P. Murat11, S. Murgia27, J. Nachtman6, S. Nahn47, H. Nakada43, T. Nakaya8, I. Nakano17, C. Nelson11, T. Nelson11, C. Neu29, D. Neuberger20, C. Newman-Holmes11, C.-Y. P. Ngan24, H. Niu4, L. Nodulman2, A. Nomerotski12, S. H. Oh10, T. Ohmoto17, T. Ohsugi17, R. Oishi43, T. Okusawa30, J. Olsen46, W. Orejudos23, C. Pagliarone34, F. Palmonari34, R. Paoletti34, V. Papadimitriou41, S. P. Pappas47, D. Partos4, J. Patrick11, G. Pauletta42, M. Paulini23 *, C. Paus24, L. Pescara32, T. J. Phillips10, G. Piacentino34, K. T. Pitts18, A. Pompos36, L. Pondrom46, G. Pope35, M. Popovic25,25b, F. Prokoshin9, J. Proudfoot2, F. Ptohos13, O. Pukhov9, G. Punzi34, K. Ragan25,25b, A. Rakitine24, D. Reher23, A. Reichold31, A. Ribon32, W. Riegler16, F. Rimondi3, L. Ristori34, M. Riveline25,25b, W. J. Robertson10, A. Robinson25,25b, T. Rodrigo7, S. Rolli44, L. Rosenson24, R. Roser11, R. Rossin32, A. Roy24, A. Safonov38, R. St. Denis15, W. K. Sakumoto37, D. Saltzberg6, C. Sanchez29, A. Sansoni13, L. Santi42, H. Sato43, P. Savard25,25b, P. Schlabach11, E. E. Schmidt11, M. P. Schmidt47, M. Schmitt16, L. Scodellaro32, A. Scott6, A. Scribano34, S. Segler11, S. Seidel28, Y. Seiya43, A. Semenov9, F. Semeria3, T. Shah24, M. D. Shapiro23, P. F. Shepard35, T. Shibayama43, M. Shimojima43, M. Shochet8, J. Siegrist23, G. Signorelli34, A. Sill41, P. Sinervo25,25b, P. Singh18, A. J. Slaughter47, K. Sliwa44, C. Smith19, F. D. Snider11, A. Solodsky38, J. Spalding11, T. Speer14, P. Sphicas24, F. Spinella34, M. Spiropulu16, L. Spiegel11, J. Steele46, A. Stefanini34, J. Strologas18, F. Strumia14, D. Stuart11, K. Sumorok24, T. Suzuki43, T. Takano30, R. Takashima17, K. Takikawa43, P. Tamburello10, M. Tanaka43, B. Tannenbaum6, W. Taylor25,25b, M. Tecchio26, R. Tesarek11, P. K. Teng1, K. Terashi38, S. Tether24, A. S. Thompson15, R. Thurman-Keup2, P. Tipton37, S. Tkaczyk11, K. Tollefson37, A. Tollestrup11, H. Toyoda30, W. Trischuk25,25b, J. F. de Troconiz16, J. Tseng24, N. Turini34, F. Ukegawa43, T. Vaiciulis37, J. Valls39, S. Vejcik, III11, G. Velev11, R. Vidal11, R. Vilar7, I. Volobouev23, D. Vucinic24, R. G. Wagner2, R. L. Wagner11, J. Wahl8, N. B. Wallace39, A. M. Walsh39, C. Wang10, M. J. Wang1, T. Watanabe43, D. Waters31, T. Watts39, R. Webb40, H. Wenzel20, W. C. Wester, III11, A. B. Wicklund, E. Wicklund11, T. Wilkes5, H. H. Williams33, P. Wilson11, B. L. Winer29, D. Winn26, S. Wolbers11, D. Wolinski26, J. Wolinski27, S. Wolinski26, S. Worm28, X. Wu14, J. Wyss34, A. Yagil11, W. Yao23, G. P. Yeh11, P. Yeh1, J. Yoh11, C. Yosef27, T. Yoshida30, I. Yu21,21b,21c, S. Yu33, Z. Yu47, A. Zanetti42, F. Zetti23, and S. Zucchelli3 (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
2Argonne National Laboratory, Argonne, Illinois 60439
3Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
4Brandeis University, Waltham, Massachusetts 02254
5University of California at Davis, Davis, California 95616
6University of California at Los Angeles, Los Angeles, California 90024
7Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
8Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
9Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
10Duke University, Durham, North Carolina 27708
11Fermi National Accelerator Laboratory, Batavia, Illinois 60510
12University of Florida, Gainesville, Florida 32611
13Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
14University of Geneva, CH-1211 Geneva 4, Switzerland
15Glasgow University, Glasgow G12 8QQ, United Kingdom
16Harvard University, Cambridge, Massachusetts 02138
17Hiroshima University, Higashi-Hiroshima 724, Japan
18University of Illinois, Urbana, Illinois 61801
19The Johns Hopkins University, Baltimore, Maryland 21218
20Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
21aCenter for High Energy Physics, Kyungpook National University, Taegu 702-701, Korea,
21bSeoul National University, Seoul 151-742, Korea,
21cand SungKyunKwan University, Suwon 440-746, Korea
22High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
23Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720
24Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
25aInstitute of Particle Physics, McGill University, Montreal H3A 2T8, Canada,
25band University of Toronto, Toronto M5S 1A7, Canada
26University of Michigan, Ann Arbor, Michigan 48109
27Michigan State University, East Lansing, Michigan 48824
28University of New Mexico, Albuquerque, New Mexico 87131
29The Ohio State University, Columbus, Ohio 43210
30Osaka City University, Osaka 588, Japan
31University of Oxford, Oxford OX1 3RH, United Kingdom
32Universita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
33University of Pennsylvania, Philadelphia, Pennsylvania 19104
34Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
35University of Pittsburgh, Pittsburgh, Pennsylvania 15260
36Purdue University, West Lafayette, Indiana 47907
37University of Rochester, Rochester, New York 14627
38Rockefeller University, New York, New York 10021
39Rutgers University, Piscataway, New Jersey 08855
40Texas A&M University, College Station, Texas 77843
41Texas Tech University, Lubbock, Texas 79409
42Istituto Nazionale di Fisica Nucleare, University of Trieste, Udine, Italy
43University of Tsukuba, Tsukuba, Ibaraki 305, Japan
44Tufts University, Medford, Massachusetts 02155
45Waseda University, Tokyo 169, Japan
46University of Wisconsin, Madison, Wisconsin 53706
47Yale University, New Haven, Connecticut 06520
Received 30 October 2000
We have measured the ratio of prompt production rates of the charmonium states χc1 and χc2 in 110 pb-1 of pp̅ collisions at sqrt[s] = 1.8 TeV. The photon from their decay into J/ψγ is reconstructed through conversion into e+e- pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections σχc2 / σχc1 = 0.96±0.27(stat)±0.11(syst) for events with pT(J/ψ)>4.0 GeV/c, |η(J/ψ)|<0.6, and pT(γ)>1.0 GeV/c.
©2001 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.86.3963
DOI: 10.1103/PhysRevLett.86.3963
PACS: 13.85.Ni, 14.40.Gx
* Present address: Carnegie Mellon University, Pittsburgh, Pennsylvania 15213.
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