Phys. Rev. D 72, 051107 (2005) [7 pages]
Search for first-generation scalar leptoquarks in pp̅ collisions at sqrt[s]=1.96 TeV
D. Acosta et al. CDF Collaboration
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D. Acosta16, J. Adelman12, T. Affolder9, T. Akimoto54, M. G. Albrow15, D. Ambrose15, S. Amerio42, D. Amidei33, A. Anastassov50, K. Anikeev15, A. Annovi44, J. Antos1, M. Aoki54, G. Apollinari15, T. Arisawa56, J-F. Arguin32, A. Artikov13, W. Ashmanskas15, A. Attal7, F. Azfar41, P. Azzi-Bacchetta42, N. Bacchetta42, H. Bachacou28, W. Badgett15, A. Barbaro-Galtieri28, G. J. Barker25, V. E. Barnes46, B. A. Barnett24, S. Baroiant6, G. Bauer31, F. Bedeschi44, S. Behari24, S. Belforte53, G. Bellettini44, J. Bellinger58, A. Belloni31, E. Ben-Haim15, D. Benjamin14, A. Beretvas15, T. Berry29, A. Bhatti48, M. Binkley15, D. Bisello42, M. Bishai15, R. E. Blair2, C. Blocker5, K. Bloom33, B. Blumenfeld24, A. Bocci48, A. Bodek47, G. Bolla46, A. Bolshov31, D. Bortoletto46, J. Boudreau45, S. Bourov15, B. Brau9, C. Bromberg34, E. Brubaker12, J. Budagov13, H. S. Budd47, K. Burkett15, G. Busetto42, P. Bussey19, K. L. Byrum2, S. Cabrera14, M. Campanelli18, M. Campbell33, F. Canelli7, A. Canepa46, M. Casarsa53, D. Carlsmith58, R. Carosi44, S. Carron14, M. Cavalli-Sforza3, A. Castro4, P. Catastini44, D. Cauz53, A. Cerri28, L. Cerrito41, J. Chapman33, Y. C. Chen1, M. Chertok6, G. Chiarelli44, G. Chlachidze13, F. Chlebana15, I. Cho27, K. Cho27, D. Chokheli13, J. P. Chou20, S. Chuang58, K. Chung11, W-H. Chung58, Y. S. Chung47, M. Cijliak44, C. I. Ciobanu23, M. A. Ciocci44, A. G. Clark18, D. Clark5, M. Coca14, A. Connolly28, M. Convery48, J. Conway6, B. Cooper30, K. Copic33, M. Cordelli17, G. Cortiana42, J. Cranshaw52, J. Cuevas10, A. Cruz16, R. Culbertson15, C. Currat28, D. Cyr58, D. Dagenhart5, S. Da Ronco42, S. D’Auria19, P. de Barbaro47, S. De Cecco49, A. Deisher28, G. De Lentdecker47, M. Dell’Orso44, S. Demers47, L. Demortier48, M. Deninno4, D. De Pedis49, P. F. Derwent15, T. Devlin50, C. Dionisi49, J. R. Dittmann15, P. DiTuro50, C. Dörr25, A. Dominguez28, S. Donati44, M. Donega18, J. Donini42, M. D’Onofrio18, T. Dorigo42, K. Ebina56, J. Efron38, J. Ehlers18, R. Erbacher6, M. 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Vaiciulis47, A. Varganov33, S. Vejcik, III15, G. Velev15, V. Veszpremi46, G. Veramendi23, T. Vickey23, R. Vidal15, I. Vila10, R. Vilar10, I. Vollrath32, I. Volobouev28, M. von der Mey7, P. Wagner51, R. G. Wagner2, R. L. Wagner15, W. Wagner25, R. Wallny7, T. Walter25, Z. Wan50, M. J. Wang1, S. M. Wang16, A. Warburton32, B. Ward19, S. Waschke19, D. Waters30, T. Watts50, M. Weber28, W. C. Wester, III15, B. Whitehouse55, D. Whiteson43, A. B. Wicklund2, E. Wicklund15, H. H. Williams43, P. Wilson15, B. L. Winer38, P. Wittich43, S. Wolbers15, C. Wolfe12, M. Wolter55, M. Worcester7, S. Worm50, T. Wright33, X. Wu18, F. Würthwein8, A. Wyatt30, A. Yagil15, T. Yamashita39, K. Yamamoto40, J. Yamaoka50, C. Yang59, U. K. Yang12, W. Yao28, G. P. Yeh15, J. Yoh15, K. Yorita56, T. Yoshida40, I. Yu27, S. Yu43, J. C. Yun15, L. Zanello49, A. Zanetti53, I. Zaw20, F. Zetti44, J. Zhou50, and S. Zucchelli4 (CDF Collaboration)
1Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of China
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain
4Istituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, Italy
5Brandeis University, Waltham, Massachusetts 02254, USA
6University of California, Davis, Davis, California 95616, USA
7University of California, Los Angeles, Los Angeles, California 90024, USA
8University of California, San Diego, La Jolla, California 92093, USA
9University of California, Santa Barbara, Santa Barbara, California 93106, USA
10Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander, Spain
11Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
12Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
13Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
14Duke University, Durham, North Carolina 27708, USA
15Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
16University of Florida, Gainesville, Florida 32611, USA
17Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
18University of Geneva, CH-1211 Geneva 4, Switzerland
19Glasgow University, Glasgow G12 8QQ, United Kingdom
20Harvard University, Cambridge, Massachusetts 02138, USA
21Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland
22Hiroshima University, Higashi-Hiroshima 724, Japan
23University of Illinois, Urbana, Illinois 61801, USA
24The Johns Hopkins University, Baltimore, Maryland 21218, USA
25Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
26High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
27Center for High Energy Physics, Kyungpook National University, Taegu 702-701; Seoul National University, Seoul 151-742; and SungKyunKwan University, Suwon 440-746, Korea
28Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
29University of Liverpool, Liverpool L69 7ZE, United Kingdom
30University College London, London WC1E 6BT, United Kingdom
31Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
32Institute of Particle Physics, McGill University, Montréal, Canada H3A 2T8; and University of Toronto, Toronto, Canada M5S 1A7
33University of Michigan, Ann Arbor, Michigan 48109, USA
34Michigan State University, East Lansing, Michigan 48824, USA
35Institution for Theoretical and Experimental Physics, ITEP, Moscow 117259, Russia
36University of New Mexico, Albuquerque, New Mexico 87131, USA
37Northwestern University, Evanston, Illinois 60208, USA
38The Ohio State University, Columbus, Ohio 43210, USA
39Okayama University, Okayama 700-8530, Japan
40Osaka City University, Osaka 588, Japan
41University of Oxford, Oxford OX1 3RH, United Kingdom
42University of Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova, Italy
43University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
44Istituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore, I-56127 Pisa, Italy
45University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
46Purdue University, West Lafayette, Indiana 47907, USA
47University of Rochester, Rochester, New York 14627, USA
48The Rockefeller University, New York, New York 10021, USA
49Istituto Nazionale di Fisica Nucleare, Sezione di Roma 1, University di Roma “La Sapienza,” I-00185 Roma, Italy
50Rutgers University, Piscataway, New Jersey 08855, USA
51Texas A&M University, College Station, Texas 77843, USA
52Texas Tech University, Lubbock, Texas 79409, USA
53Istituto Nazionale di Fisica Nucleare, University of Trieste/Udine, Italy
54University of Tsukuba, Tsukuba, Ibaraki 305, Japan
55Tufts University, Medford, Massachusetts 02155, USA
56Waseda University, Tokyo 169, Japan
57Wayne State University, Detroit, Michigan 48201, USA
58University of Wisconsin, Madison, Wisconsin 53706, USA
59Yale University, New Haven, Connecticut 06520, USA
Received 27 June 2005; published 29 September 2005
We report on a search for pair production of first-generation scalar leptoquarks (LQ) in pp̅ collisions at sqrt[s]=1.96 TeV using an integrated luminosity of 203 pb-1 collected at the Fermilab Tevatron collider by the CDF experiment. We observe no evidence for LQ production in the topologies arising from LQLQ̅ →eqeq and LQLQ̅ →eqνq, and derive 95% C.L. upper limits on the LQ production cross section. The results are combined with those obtained from a separately reported CDF search in the topology arising from LQLQ̅ →νqνq and 95% C.L. lower limits on the LQ mass as a function of β=BR(LQ→eq) are derived. The limits are 236, 205 and 145 GeV/c2 for β=1, β=0.5 and β=0.1, respectively.
©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevD.72.051107
DOI: 10.1103/PhysRevD.72.051107
PACS: 13.85.Rm, 12.60.−i, 14.80.−j
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