Phys. Rev. Lett.
78,
2698–2703
(1997)
Observation of Diffractive W-Boson Production at the Fermilab Tevatron
F. Abe et al. (CDF Collaboration)
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F. Abe16, H. Akimoto35, A. Akopian30, M. G. Albrow7, S. R. Amendolia26, D. Amidei19, J. Antos32, S. Aota35, G. Apollinari30, T. Asakawa35, W. Ashmanskas17, M. Atac7, F. Azfar25, P. Azzi-Bacchetta24, N. Bacchetta24, W. Badgett19, S. Bagdasarov30, M. W. Bailey21, J. Bao38, P. de Barbaro29, A. Barbaro-Galtieri17, V. E. Barnes28, B. A. Barnett15, M. Barone26, E. Barzi9, G. Bauer18, T. Baumann11, F. Bedeschi26, S. Behrends3, S. Belforte26, G. Bellettini26, J. Bellinger37, D. Benjamin34, J. Benlloch18, J. Bensinger3, D. Benton25, A. Beretvas7, J. P. Berge7, J. Berryhill5, S. Bertolucci9, B. Bevensee25, A. Bhatti30, K. Biery7, M. Binkley7, D. Bisello24, R. E. Blair1, C. Blocker3, A. Bodek29, W. Bokhari18, V. Bolognesi2, G. Bolla24, D. Bortoletto28, J. Boudreau27, L. Breccia2, C. Bromberg20, N. Bruner21, E. Buckley-Geer7, H. S. Budd29, K. Burkett19, G. Busetto24, A. Byon-Wagner7, K. L. Byrum1, J. Cammerata15, C. Campagnari7, M. Campbell19, A. Caner26, W. Carithers17, D. Carlsmith37, A. Castro24, D. Cauz26, Y. Cen29, F. Cervelli26, P. S. Chang32, P. T. Chang32, H. Y. Chao32, J. Chapman19, M.-T. Cheng32, G. Chiarelli26, T. Chikamatsu35, C. N. Chiou32, L. Christofek13, S. Cihangir7, A. G. Clark10, M. Cobal26, E. Cocca26, M. Contreras5, J. Conway31, J. Cooper7, M. Cordelli9, C. Couyoumtzelis10, D. Crane1, D. Cronin-Hennessy6, R. Culbertson5, T. Daniels18, F. DeJongh7, S. Delchamps7, S. Dell'Agnello26, M. Dell'Orso26, R. Demina7, L. Demortier30, M. Deninno2, P. F. Derwent7, T. Devlin31, J. R. Dittmann6, S. Donati26, J. Done33, T. Dorigo24, A. Dunn19, N. Eddy19, K. Einsweiler17, J. E. Elias7, R. Ely17, E. Engels, Jr.27, D. Errede13, S. Errede13, Q. Fan29, G. Feild38, C. Ferretti26, I. Fiori2, B. Flaugher7, G. W. Foster7, M. Franklin11, M. Frautschi34, J. Freeman7, J. Friedman18, H. Frisch5, Y. Fukui16, S. Funaki35, S. Galeotti26, M. Gallinaro24, O. Ganel34, M. Garcia-Sciveres17, A. F. Garfinkel28, C. Gay11, S. Geer7, D. W. Gerdes15, P. Giannetti26, N. Giokaris30, P. Giromini9, G. Giusti26, L. Gladney25, D. Glenzinski15, M. Gold21, J. Gonzalez25, A. Gordon11, A. T. Goshaw6, Y. Gotra24, K. Goulianos30, H. Grassmann26, L. Groer31, C. Grosso-Pilcher5, G. Guillian19, R. S. Guo32, C. Haber17, E. Hafen18, S. R. Hahn7, R. Hamilton11, R. Handler37, R. M. Hans38, F. Happacher26, K. Hara35, A. D. Hardman28, B. Harral25, R. M. Harris7, S. A. Hauger6, J. Hauser4, C. Hawk31, E. Hayashi35, J. Heinrich25, K. D. Hoffman28, M. Hohlmann5, C. Holck25, R. Hollebeek25, L. Holloway13, A. Hölscher14, S. Hong19, G. Houk25, P. Hu27, B. T. Huffman27, R. Hughes22, J. Huston20, J. Huth11, J. Hylen7, H. Ikeda35, M. Incagli26, J. Incandela7, G. Introzzi26, J. Iwai35, Y. Iwata12, H. Jensen7, U. Joshi7, R. W. Kadel17, E. Kajfasz24, H. Kambara10, T. Kamon33, T. Kaneko35, K. Karr36, H. Kasha38, Y. Kato23, T. A. Keaffaber28, L. Keeble9, K. Kelley18, R. D. Kennedy7, R. Kephart7, P. Kesten17, D. Kestenbaum11, R. M. Keup13, H. Keutelian7, F. Keyvan4, B. Kharadia13, B. J. Kim29, D. H. Kim7, H. S. Kim14, S. B. Kim19, S. H. Kim35, Y. K. Kim17, L. Kirsch3, P. Koehn29, K. Kondo35, J. Konigsberg8, S. Kopp5, K. Kordas14, A. Korytov8, W. Koska7, E. Kovacs7, W. Kowald6, M. Krasberg19, J. Kroll7, M. Kruse29, T. Kuwabara35, S. E. Kuhlmann1, E. Kuns31, A. T. Laasanen28, S. Lammel7, J. I. Lamoureux3, T. LeCompte1, S. Leone26, J. D. Lewis7, P. Limon7, M. Lindgren4, T. M. Liss13, N. Lockyer25, O. Long25, C. Loomis31, M. Loreti24, J. Lu33, D. Lucchesi26, P. Lukens7, S. Lusin37, J. Lys17, K. Maeshima7, A. Maghakian30, P. Maksimovic18, M. Mangano26, J. Mansour20, M. Mariotti24, J. P. Marriner7, A. Martin38, J. A. J. Matthews21, R. Mattingly18, P. McIntyre33, P. Melese30, A. Menzione26, E. Meschi26, S. Metzler25, C. Miao19, T. Miao7, G. Michail11, R. Miller20, H. Minato35, S. Miscetti9, M. Mishina16, H. Mitsushio35, T. Miyamoto35, S. Miyashita35, N. Moggi26, Y. Morita16, J. Mueller27, A. Mukherjee7, T. Muller4, P. Murat26, H. Nakada35, I. Nakano35, C. Nelson7, D. Neuberger4, C. Newman-Holmes7, C.-Y. Ngan18, M. Ninomiya35, L. Nodulman1, S. H. Oh6, K. E. Ohl38, T. Ohmoto12, T. Ohsugi12, R. Oishi35, M. Okabe35, T. Okusawa23, R. Oliveira25, J. Olsen37, C. Pagliarone2, R. Paoletti26, V. Papadimitriou34, S. P. Pappas38, N. Parashar26, S. Park7, A. Parri9, J. Patrick7, G. Pauletta26, M. Paulini17, A. Perazzo26, L. Pescara24, M. D. Peters17, T. J. Phillips6, G. Piacentino2, M. Pillai29, K. T. Pitts7, R. Plunkett7, L. Pondrom37, J. Proudfoot1, F. Ptohos11, G. Punzi26, K. Ragan14, D. Reher17, A. Ribon24, F. Rimondi2, L. Ristori26, W. J. Robertson6, T. Rodrigo26, S. Rolli26, J. Romano5, L. Rosenson18, R. Roser13, W. K. Sakumoto29, D. Saltzberg5, A. Sansoni9, L. Santi26, H. Sato35, P. Schlabach7, E. E. Schmidt7, M. P. Schmidt38, A. Scribano26, S. Segler7, S. Seidel21, Y. Seiya35, G. Sganos14, M. D. Shapiro17, N. M. Shaw28, Q. Shen28, P. F. Shepard27, M. Shimojima35, M. Shochet5, J. Siegrist17, A. Sill34, P. Sinervo14, P. Singh27, J. Skarha15, K. Sliwa36, F. D. Snider15, T. Song19, J. Spalding7, T. Speer10, P. Sphicas18, F. Spinella26, M. Spiropulu11, L. Spiegel7, L. Stanco24, J. Steele37, A. Stefanini26, K. Strahl14, J. Strait7, R. Ströhmer7, D. Stuart7, G. Sullivan5, A. Soumarokov32, K. Sumorok18, J. Suzuki35, T. Takada35, T. Takahashi23, T. Takano35, K. Takikawa35, N. Tamura12, B. Tannenbaum21, F. Tartarelli26, W. Taylor14, P. K. Teng32, Y. Teramoto23, S. Tether18, D. Theriot7, T. L. Thomas21, R. Thun19, M. Timko36, P. Tipton29, A. Titov30, S. Tkaczyk7, D. Toback5, K. Tollefson29, A. Tollestrup7, W. Trischuk14, J. F. de Troconiz11, S. Truitt19, J. Tseng18, N. Turini26, T. Uchida35, N. Uemura35, F. Ukegawa25, G. Unal25, J. Valls7, S. C. van den Brink27, S. Vejcik III19, G. Velev26, R. Vidal7, M. Vondracek13, D. Vucinic18, R. G. Wagner1, R. L. Wagner7, J. Wahl5, N. B. Wallace26, A. M. Walsh31, C. Wang6, C. H. Wang32, J. Wang5, M. J. Wang32, Q. F. Wang30, A. Warburton14, T. Watts31, R. Webb33, C. Wei6, C. Wendt37, H. Wenzel17, W. C. Wester III7, A. B. Wicklund1, E. Wicklund7, R. Wilkinson25, H. H. Williams25, P. Wilson5, B. L. Winer22, D. Winn19, D. Wolinski19, J. Wolinski20, S. Worm21, X. Wu10, J. Wyss24, A. Yagil7, W. Yao17, K. Yasuoka35, Y. Ye14, G. P. Yeh7, P. Yeh32, M. Yin6, J. Yoh7, C. Yosef20, T. Yoshida23, D. Yovanovitch7, I. Yu7, L. Yu21, J. C. Yun7, A. Zanetti26, F. Zetti26, L. Zhang37, W. Zhang25, and S. Zucchelli2 (CDF Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439
2Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
3Brandeis University, Waltham, Massachusetts 02264
4University of California at Los Angeles, Los Angeles, California 90024
5University of Chicago, Chicago, Illinois 60638
6Duke University, Durham, North Carolina 28708
7Fermi National Accelerator Laboratory, Batavia, Illinois 60510
8University of Florida, Gainesville, Florida 60510
9Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
10University of Geneva, CH-1211 Geneva 4, Switzerland
11Harvard University, Cambridge, Massachusetts 02138
12Hiroshima University, Higashi-Hiroshima 724, Japan
13University of Illinois, Urbana, Illinois 61801
14Institute of Particle Physics, McGill University, Montreal H3A 2T8, and University of Toronto, Toronto M5S 1A7, Canada
15The Johns Hopkins University, Baltimore, Maryland 21218
16National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 315, Japan
17Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720
18Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
19University of Michigan, Ann Arbor, Michigan 48109
20Michigan State University, East Lansing, Michigan 48824
21University of New Mexico, Albuquerque, New Mexico 87132
22The Ohio State University, Columbus, Ohio 43320
23Osaka City University, Osaka 588, Japan
24Universita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, Italy
25University of Pennsylvania, Philadelphia, Pennsylvania 19104
26Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
27University of Pittsburgh, Pittsburgh, Pennsylvania 15270
28Purdue University, West Lafayette, Indiana 47907
29University of Rochester, Rochester, New York 14628
30Rockefeller University, New York, New York 10021
31Rutgers University, Piscataway, New Jersey 08854
32Academia Sinica, Taipei, Taiwan 11530, Republic of China
33Texas A&M University, College Station, Texas 77843
34Texas Tech University, Lubbock, Texas 79409
35University of Tsukuba, Tsukuba, Ibaraki 315, Japan
36Tufts University, Medford, Massachusetts 02155
37University of Wisconsin, Madison, Wisconsin 53806
38Yale University, New Haven, Connecticut 06511
Received 14 January 1997; published in the issue dated 7 April 1997
We report the first observation of diffractively produced W bosons. In a sample of W→eν events produced in pp̅ collisions at √s = 1.8 TeV, we find an excess of events with a forward rapidity gap, which is attributed to diffraction. The probability that this excess is consistent with nondiffractive production is 1.1×10-4 (3.8σ). The relatively low fraction of W+jet events observed within this excess implies that mainly quarks from the Pomeron, which mediates diffraction, participate in W production. The diffractive to nondiffractive W production ratio is found to be RW = (1.15±0.55)%.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.2698
DOI:
10.1103/PhysRevLett.78.2698
PACS:
13.85.Qk, 12.38.Qk, 12.40.Nn
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