Phys. Rev. Lett.
74,
850–854
(1995)
Charge Asymmetry in W-Boson Decays Produced in pp̅ Collisions at √s=1.8 TeV
F. Abe et al.
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F. Abe13, M. G. Albrow7, D. Amidei16, J. Antos28, C. Anway-Wiese4, G. Apollinari26, H. Areti7, M. Atac7, P. Auchincloss25, F. Azfar21, P. Azzi20, N. Bacchetta18, W. Badgett16, M. W. Bailey18, J. Bao34, P. de Barbaro25, A. Barbaro-Galtieri14, V. E. Barnes24, B. A. Barnett12, P. Bartalini23, G. Bauer15, T. Baumann9, F. Bedeschi23, S. Behrends3, S. Belforte23, G. Bellettini23, J. Bellinger33, D. Benjamin32, J. Benlloch15, J. Bensinger3, D. Benton21, A. Beretvas7, J. P. Berge7, S. Bertolucci8, A. Bhatti26, K. Biery11, M. Binkley7, F. Bird29, D. Bisello20, R. E. Blair1, C. Blocker29, A. Bodek25, W. Bokhari15, V. Bolognesi23, D. Bortoletto24, C. Boswell12, T. Boulos14, G. Brandenburg9, E. Buckley-Geer7, H. S. Budd25, K. Burkett16, G. Busetto20, A. Byon-Wagner7, K. L. Byrum1, J. Cammerata12, C. Campagnari7, M. Campbell16, A. Caner7, W. Carithers14, D. Carlsmith33, A. Castro20, Y. Cen21, F. Cervelli23, J. Chapman16, M. -T. Cheng28, G. Chiarelli8, T. Chikamatsu31, S. Cihangir7, A. G. Clark23, M. Cobal23, M. Contreras5, J. Conway27, J. Cooper7, M. Cordelli8, D. Crane1, J. D. Cunningham3, T. Daniels15, F. DeJongh7, S. Delchamps7, S. Dell'Agnello23, M. Dell'Orso23, L. Demortier26, B. Denby23, M. Deninno2, P. F. Derwent16, T. Devlin27, M. Dickson25, S. Donati23, R. B. Drucker14, A. Dunn16, K. Einsweiler14, J. E. Elias7, R. Ely14, E. Engels, Jr.22, S. Eno5, D. Errede10, S. Errede10, Q. Fan25, B. Farhat15, I. Fiori2, B. Flaugher7, G. W. Foster7, M. Franklin9, M. Frautschi18, J. Freeman7, J. Friedman15, H. Frisch5, A. Fry29, T. A. Fuess1, Y. Fukui13, S. Funaki31, G. Gagliardi23, S. Galeotti23, M. Gallinaro20, A. F. Garfinkel24, S. Geer7, D. W. Gerdes16, P. Giannetti23, N. Giokaris26, P. Giromini8, L. Gladney21, D. Glenzinski12, M. Gold18, J. Gonzalez21, A. Gordon9, A. T. Goshaw6, K. Goulianos26, H. Grassmann6, A. Grewal21, G. Grieco23, L. Groer27, C. Grosso-Pilcher5, C. Haber14, S. R. Hahn7, R. Hamilton9, R. Handler33, R. M. Hans34, K. Hara31, B. Harral21, R. M. Harris7, S. A. Hauger6, J. Hauser4, C. Hawk27, J. Heinrich21, D. Cronin-Hennessy6, R. Hollebeek21, L. Holloway10, A. Hölscher11, S. Hong16, G. Houk21, P. Hu22, B. T. Huffman22, R. Hughes25, P. Hurst9, J. Huston17, J. Huth9, J. Hylen7, M. Incagli23, J. Incandela7, H. Iso31, H. Jensen7, C. P. Jessop9, U. Joshi7, R. W. Kadel14, E. Kajfasz7, T. Kamon30, T. Kaneko31, D. A. Kardelis10, H. Kasha34, Y. Kato19, L. Keeble30, R. D. Kennedy27, R. Kephart7, P. Kesten14, D. Kestenbaum9, R. M. Keup10, H. Keutelian7, F. Keyvan4, D. H. Kim7, H. S. Kim11, S. B. Kim16, S. H. Kim31, Y. K. Kim14, L. Kirsch3, P. Koehn25, K. Kondo31, J. Konigsberg9, S. Kopp5, K. Kordas11, W. Koska7, E. Kovacs7, W. Kowald6, M. Krasberg16, J. Kroll7, M. Kruse24, S. E. Kuhlmann1, E. Kuns27, A. T. Laasanen24, N. Labanca23, S. Lammel4, J. I. Lamoureux3, T. LeCompte10, S. Leone23, J. D. Lewis7, P. Limon7, M. Lindgren4, T. M. Liss10, N. Lockyer21, C. Loomis27, O. Long21, M. Loreti20, E. H. Low21, J. Lu30, D. Lucchesi23, C. B. Luchini10, P. Lukens7, P. Maas33, K. Maeshima7, A. Maghakian26, P. Maksimovic15, M. Mangano23, J. Mansour17, M. Mariotti23, J. P. Marriner7, A. Martin10, J. A. J. Matthews18, R. Mattingly15, P. McIntyre30, P. Melese26, A. Menzione23, E. Meschi23, G. Michail9, S. Mikamo13, M. Miller5, R. Miller17, T. Mimashi31, S. Miscetti8, M. Mishina13, H. Mitsushio31, S. Miyashita31, Y. Morita13, S. Moulding26, J. Mueller27, A. Mukherjee7, T. Muller4, P. Musgrave11, L. F. Nakae29, I. Nakano31, C. Nelson7, D. Neuberger4, C. Newman-Holmes7, L. Nodulman1, S. Ogawa31, S. H. Oh6, K. E. Ohl34, R. Oishi31, T. Okusawa19, C. Pagliarone23, R. Paoletti23, V. Papadimitriou7, S. Park7, J. Patrick7, G. Pauletta23, M. Paulini14, L. Pescara20, M. D. Peters14, T. J. Phillips6, G. Piacentino2, M. Pillai25, R. Plunkett7, L. Pondrom33, N. Produit14, J. Proudfoot1, F. Ptohos9, G. Punzi23, K. Ragan11, F. Rimondi2, L. Ristori23, M. Roach-Bellino32, W. J. Robertson6, T. Rodrigo7, J. Romano5, L. Rosenson15, W. K. Sakumoto25, D. Saltzberg5, A. Sansoni8, V. Scarpine30, A. Schindler14, P. Schlabach9, E. E. Schmidt7, M. P. Schmidt34, O. Schneider14, G. F. Sciacca23, A. Scribano23, S. Segler7, S. Seidel18, Y. Seiya31, G. Sganos11, A. Sgolacchia2, M. Shapiro14, N. M. Shaw24, Q. Shen24, P. F. Shepard22, M. Shimojima31, M. Shochet5, J. Siegrist29, A. Sill7, P. Sinervo11, P. Singh22, J. Skarha12, K. Sliwa32, D. A. Smith23, F. D. Snider12, L. Song7, T. Song16, J. Spalding7, L. Spiegel7, P. Sphicas15, A. Spies12, L. Stanco20, J. Steele33, A. Stefanini23, K. Strahl11, J. Strait7, D. Stuart7, G. Sullivan5, K. Sumorok15, R. L. Swartz, Jr.10, T. Takahashi19, K. Takikawa31, F. Tartarelli23, W. Taylor11, Y. Teramoto19, S. Tether15, D. Theriot7, J. Thomas29, T. L. Thomas18, R. Thun16, M. Timko32, P. Tipton25, A. Titov26, S. Tkaczyk7, K. Tollefson25, A. Tollestrup7, J. Tonnison24, J. F. de Troconiz9, J. Tseng12, M. Turcotte29, N. Turini2, N. Uemura31, F. Ukegawa21, G. Unal21, S. van den Brink22, S. Vejcik, III16, R. Vidal7, M. Vondracek10, R. G. Wagner1, R. L. Wagner7, N. Wainer7, R. C. Walker25, G. Wang23, J. Wang5, M. J. Wang28, Q. F. Wang26, A. Warburton11, G. Watts25, T. Watts27, R. Webb30, C. Wendt33, H. Wenzel14, W. C. Wester, III14, T. Westhusing10, A. B. Wicklund1, E. Wicklund7, R. Wilkinson21, H. H. Williams21, P. Wilson5, B. L. Winer25, J. Wolinski30, D. Y. Wu16, X. Wu23, J. Wyss20, A. Yagil7, W. Yao14, K. Yasuoka31, Y. Ye11, G. P. Yeh7, P. Yeh28, M. Yin6, J. Yoh7, T. Yoshida19, D. Yovanovitch7, I. Yu34, J. C. Yun7, A. Zanetti23, F. Zetti23, L. Zhang33, S. Zhang16, W. Zhang21, and S. Zucchelli2
1Argonne National Laboratory, Argonne, Illinois 60439
2Istituto Nazionale di Fisica Nucleare, University of Bologna, 1-40126 Bologna, Italy
3Brandeis University, Waltham, Massachusetts 02254
4University of California at Los Angeles, Los Angeles, California 90024
5University of Chicago, Chicago, Illinois 60637
6Duke University, Durham, North Carolina 27708
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510
8Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
9Harvard University, Cambridge, Massachusetts 02138
10University of Illinois, Urbana, Illinois 61801
11Institute of Particle Physics, McGill University, Montreal H3A 2T8, Canada and University of Toronto, Toronto M5S 1A7, Canada
12The Johns Hopkins University, Baltimore, Maryland 21218
13National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305, Japan
14Lawrence Berkeley Laboratory, Berkeley, California 94720
15Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
16University of Michigan, Ann Arbor, Michigan 48109
17Michigan State University, East Lansing, Michigan 48824
18University of New Mexico, Albuquerque, New Mexico 87131
19Osaka City University, Osaka 588, Japan
20Universita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
21University of Pennsylvania, Philadelphia, Pennsylvania 19104
22University of Pittsburgh, Pittsburgh, Pennsylvania 15260
23Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
24Purdue University, West Lafayette, Indiana 47907
25University of Rochester, Rochester, New York 14627
26Rockefeller University, New York, New York 10021
27Rutgers University, Piscataway, New Jersey 08854
28Academia Sinica, Taiwan 11529, Republic of China
29Superconducting Super Collider Laboratory, Dallas, Texas 75237
30Texas A&M University, College Station, Texas 77843
31University of Tsukuba, Tsukuba, Ibaraki 305, Japan
32Tufts University, Medford, Massachusetts 02155
33University of Wisconsin, Madison, Wisconsin 53706
34Yale University, New Haven, Connecticut 06511
Received 12 September 1994; published in the issue dated 6 February 1995
Charge asymmetry has been measured using 19 039 W decays recorded by the Collider Detector at Fermilab during the 1992-93 run of the Tevatron Collider. The asymmetry is sensitive to the ratio of d and u quark distributions to x<0.01 at Q2≈MW2, where nonperturbative effects are minimal. It is found that of the two current sets of parton distributions, those of Martin, Roberts, and Stirling are favored over the sets most recently produced by the CTEQ Collaboration. The W asymmetry data provide stronger constraints on d/u ratio than the recent measurements of F2μn/F2μp which are limited by uncertainties originating from deuteron corrections.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.850
DOI:
10.1103/PhysRevLett.74.850
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