Phys. Rev. Lett. 79, 4327 - 4332 (1997)
Search for First Generation Leptoquark Pair Production in pp̅ Collisions at s} = 1.8 TeV
F. Abe et al. (CDF Collaboration)
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F. Abe17, H. Akimoto38, A. Akopian31, M. G. Albrow7, A. Amadon5, S. R. Amendolia27, D. Amidei20, J. Antos33, S. Aota36, G. Apollinari31, T. Arisawa38, T. Asakawa36, W. Ashmanskas18, M. Atac7, F. Azfar26, P. Azzi-Bacchetta25, N. Bacchetta25, W. Badgett20, S. Bagdasarov31, M. W. Bailey22, J. Bao40, P. de Barbaro30, A. Barbaro-Galtieri18, V. E. Barnes29, B. A. Barnett15, M. Barone9, E. Barzi9, G. Bauer19, T. Baumann11, F. Bedeschi27, S. Behrends3, S. Belforte27, G. Bellettini27, J. Bellinger39, D. Benjamin35, J. Benlloch19, J. Bensinger3, D. Benton26, A. Beretvas7, J. P. Berge7, J. Berryhill5, S. Bertolucci9, S. Bettelli27, B. Bevensee26, A. Bhatti31, K. Biery7, M. Binkley7, D. Bisello25, R. E. Blair1, C. Blocker3, S. Blusk30, A. Bodek30, W. Bokhari26, G. Bolla29, V. Bolognesi2, Y. Bonushkin4, D. Bortoletto29, J. Boudreau28, L. Breccia2, C. Bromberg21, N. Bruner22, E. Buckley-Geer7, H. S. Budd30, K. Burkett20, G. Busetto25, A. Byon-Wagner7, K. L. Byrum1, C. Campagnari7, M. Campbell20, A. Caner27, W. Carithers18, D. Carlsmith39, J. Cassada30, A. Castro25, D. Cauz27, Y. Cen30, A. Cerri27, F. Cervelli27, P. S. Chang33, P. T. Chang33, H. Y. Chao33, J. Chapman20, M.-T. Cheng33, M. Chertok34, G. Chiarelli27, T. Chikamatsu36, C. N. Chiou33, L. Christofek13, S. Cihangir7, A. G. Clark10, M. Cobal27, E. Cocca27, M. Contreras5, J. Conway32, J. Cooper7, M. Cordelli9, C. Couyoumtzelis10, D. Crane1, D. Cronin-Hennessy6, R. Culbertson5, T. Daniels19, F. DeJongh7, S. Delchamps7, S. Dell'Agnello27, M. Dell'Orso27, R. Demina7, L. Demortier31, M. Deninno2, P. F. Derwent7, T. Devlin32, J. R. Dittmann6, S. Donati27, J. Done34, T. Dorigo25, A. Dunn20, N. Eddy20, K. Einsweiler18, J. E. Elias7, R. Ely18, E. Engels, Jr.28, D. Errede13, S. Errede13, Q. Fan30, G. Feild40, Z. Feng15, C. Ferretti27, I. Fiori2, B. Flaugher7, G. W. Foster7, M. Franklin11, M. Frautschi35, J. Freeman7, J. Friedman19, H. Frisch5, Y. Fukui17, S. Funaki36, S. Galeotti27, M. Gallinaro26, O. Ganel35, M. Garcia-Sciveres18, A. F. Garfinkel29, C. Gay11, S. Geer7, D. W. Gerdes15, P. Giannetti27, N. Giokaris31, P. Giromini9, G. Giusti27, L. Gladney26, M. Gold22, J. Gonzalez26, A. Gordon11, A. T. Goshaw6, Y. Gotra25, K. Goulianos31, H. Grassmann27, L. Groer32, C. Grosso-Pilcher5, G. Guillian20, J. Guimarães20, R. S. Guo33, C. Haber18, E. Hafen19, S. R. Hahn7, R. Hamilton11, R. Handler39, R. M. Hans40, F. Happacher9, K. Hara36, A. D. Hardman29, B. Harral26, R. M. Harris7, S. A. Hauger6, J. Hauser4, C. Hawk32, E. Hayashi36, J. Heinrich26, B. Hinrichsen14,14b, K. D. Hoffman29, M. Hohlmann5, C. Holck26, R. Hollebeek26, L. Holloway13, S. Hong20, G. Houk26, P. Hu28, B. T. Huffman28, R. Hughes23, J. Huston21, J. Huth11, J. Hylen7, H. Ikeda36, M. Incagli27, J. Incandela7, G. Introzzi27, J. Iwai38, Y. Iwata12, H. Jensen7, U. Joshi7, R. W. Kadel18, E. Kajfasz25, H. Kambara10, T. Kamon34, T. Kaneko36, K. Karr37, H. Kasha40, Y. Kato24, T. A. Keaffaber29, K. Kelley19, R. D. Kennedy7, R. Kephart7, P. Kesten18, D. Kestenbaum11, H. Keutelian7, F. Keyvan4, B. Kharadia13, B. J. Kim30, D. H. Kim7, H. S. Kim14,14b, S. B. Kim20, S. H. Kim36, Y. K. Kim18, L. Kirsch3, P. Koehn23, A. Köngeter16, K. Kondo36, J. Konigsberg8, S. Kopp5, K. Kordas14,14b, A. Korytov8, W. Koska7, E. Kovacs7, W. Kowald6, M. Krasberg20, J. Kroll7, M. Kruse30, S. E. Kuhlmann1, E. Kuns32, T. Kuwabara36, A. T. Laasanen29, S. Lami27, S. Lammel7, J. I. Lamoureux3, M. Lancaster18, M. Lanzoni27, G. Latino27, T. LeCompte1, S. Leone27, J. D. Lewis7, P. Limon7, M. Lindgren4, T. M. Liss13, J. B. Liu30, Y. C. Liu33, N. Lockyer26, O. Long26, C. Loomis32, M. Loreti25, J. Lu34, D. Lucchesi27, P. Lukens7, S. Lusin39, J. Lys18, K. Maeshima7, A. Maghakian31, P. Maksimovic19, M. Mangano27, M. Mariotti25, J. P. Marriner7, A. Martin40, J. A. J. Matthews22, R. Mattingly19, P. Mazzanti2, P. McIntyre34, P. Melese31, A. Menzione27, E. Meschi27, S. Metzler26, C. Miao20, T. Miao7, G. Michail11, R. Miller21, H. Minato36, S. Miscetti9, M. Mishina17, H. Mitsushio36, T. Miyamoto36, S. Miyashita36, N. Moggi27, Y. Morita17, A. Mukherjee7, T. Muller16, P. Murat27, S. Murgia21, H. Nakada36, I. Nakano36, C. Nelson7, D. Neuberger16, C. Newman-Holmes7, C-Y. P. Ngan19, M. Ninomiya36, L. Nodulman1, S. H. Oh6, K. E. Ohl40, T. Ohmoto12, T. Ohsugi12, R. Oishi36, M. Okabe36, T. Okusawa24, R. Oliveira26, J. Olsen39, C. Pagliarone27, R. Paoletti27, V. Papadimitriou35, S. P. Pappas40, N. Parashar27, S. Park7, A. Parri9, J. Patrick7, G. Pauletta27, M. Paulini18, A. Perazzo27, L. Pescara25, M. D. Peters18, T. J. Phillips6, G. Piacentino27, M. Pillai30, K. T. Pitts7, R. Plunkett7, L. Pondrom39, J. Proudfoot1, F. Ptohos11, G. Punzi27, K. Ragan14,14b, D. Reher18, A. Ribon25, F. Rimondi2, L. Ristori27, W. J. Robertson6, T. Rodrigo27, S. Rolli37, J. Romano5, L. Rosenson19, R. Roser13, T. Saab14,14b, W. K. Sakumoto30, D. Saltzberg4, A. Sansoni9, L. Santi27, H. Sato36, P. Schlabach7, E. E. Schmidt7, M. P. Schmidt40, A. Scott4, A. Scribano27, S. Segler7, S. Seidel22, Y. Seiya36, F. Semeria2, G. Sganos14,14b, T. Shah19, M. D. Shapiro18, N. M. Shaw29, Q. Shen29, P. F. Shepard28, M. Shimojima36, M. Shochet5, J. Siegrist18, A. Sill35, P. Sinervo14,14b, P. Singh13, K. Sliwa37, C. Smith15, F. D. Snider15, T. Song20, J. Spalding7, T. Speer10, P. Sphicas19, F. Spinella27, M. Spiropulu11, L. Spiegel7, L. Stanco25, J. Steele39, A. Stefanini27, J. Strait7, R. Ströhmer7, F. Strumia10, D. Stuart7, G. Sullivan5, K. Sumorok19, J. Suzuki36, T. Takada36, T. Takahashi24, T. Takano36, K. Takikawa36, N. Tamura12, B. Tannenbaum22, F. Tartarelli27, W. Taylor14,14b, P. K. Teng33, Y. Teramoto24, S. Tether19, D. Theriot7, T. L. Thomas22, R. Thun20, R. Thurman-Keup1, M. Timko37, P. Tipton30, A. Titov31, S. Tkaczyk7, D. Toback5, K. Tollefson30, A. Tollestrup7, H. Toyoda24, W. Trischuk14,14b, J. F. de Troconiz11, S. Truitt20, J. Tseng19, N. Turini27, T. Uchida36, N. Uemura36, F. Ukegawa26, G. Unal26, J. Valls7, S. C. van den Brink28, S. Vejcik, III20, G. Velev27, R. Vidal7, R. Vilar7, M. Vondracek13, D. Vucinic19, R. G. Wagner1, R. L. Wagner7, J. Wahl5, N. B. Wallace27, A. M. Walsh32, C. Wang6, C. H. Wang33, J. Wang5, M. J. Wang33, Q. F. Wang31, A. Warburton14,14b, T. Watts32, R. Webb34, C. Wei6, H. Wei35, H. Wenzel16, W. C. Wester, III7, A. B. Wicklund1, E. Wicklund7, R. Wilkinson26, H. H. Williams26, P. Wilson5, B. L. Winer23, D. Winn20, D. Wolinski20, J. Wolinski21, S. Worm22, X. Wu10, J. Wyss25, A. Yagil7, W. Yao18, K. Yasuoka36, Y. Ye14,14b, G. P. Yeh7, P. Yeh33, M. Yin6, J. Yoh7, C. Yosef21, T. Yoshida24, D. Yovanovitch7, I. Yu7, L. Yu22, J. C. Yun7, A. Zanetti27, F. Zetti27, L. Zhang39, W. Zhang26, and S. Zucchelli2 (CDF Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439
2Istituto Nazionale di Fisica Nucleare, University of Bologna, I-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
8University of Florida, Gainesville, Florida 33611
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
14aInstitute of Particle Physics, McGill University, Montreal H3A 2T8
14band University of Toronto, Toronto M5S 1A7, Canada
15The Johns Hopkins University, Baltimore, Maryland 21218
16Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
17National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 315, Japan
18Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720
19Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
20University of Michigan, Ann Arbor, Michigan 48109
21Michigan State University, East Lansing, Michigan 48824
22University of New Mexico, Albuquerque, New Mexico 87131
23The Ohio State University, Columbus, Ohio 43310
24Osaka City University, Osaka 588, Japan
25Universita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, Italy
26University of Pennsylvania, Philadelphia, Pennsylvania 19104
27Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
28University of Pittsburgh, Pittsburgh, Pennsylvania 15260
29Purdue University, West Lafayette, Indiana 47907
30University of Rochester, Rochester, New York 14627
31Rockefeller University, New York, New York 10021
32Rutgers University, Piscataway, New Jersey 08855
33Academia Sinica, Taipei, Taiwan 11530, Republic of China
34Texas A&M University, College Station, Texas 77843
35Texas Tech University, Lubbock, Texas 79409
36University of Tsukuba, Tsukuba, Ibaraki 315, Japan
37Tufts University, Medford, Massachusetts 02155
38Weseda University, Tokyo 169, Japan
39University of Wisconsin, Madison, Wisconsin 53706
40Yale University, New Haven, Connecticut 06520
Received 11 August 1997
We present the results of a search for first generation scalar leptoquarks pairs (S1S̅ 1) in 110±7 pb -1 of data collected by the Collider Detector at Fermilab. We assume both leptoquarks decay to an electron and a quark. Three candidate events, with masses below 140 GeV/c2 and consistent with background expectations, are observed. We obtain a 95% confidence level upper limit on the production cross section as a function of the leptoquark mass. Using a next-to-leading order calculation of S1S̅ 1 production, we exclude scalar leptoquarks with mass less than 213 GeV/c2 at 95% C.L. for a branching ratio into eq equal to 1.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v79/p4327
DOI: 10.1103/PhysRevLett.79.4327
PACS: 14.80.-j, 13.85.Qk, 13.85.Rm
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