Phys. Rev. D
60,
112004
(1999)
[12 pages]
Measurement of the B0B0 oscillation frequency using l-D*+ pairs and lepton flavor tags
T. Affolder et al. (CDF Collaboration)
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T. Affolder21, H. Akimoto42, A. Akopian35, M. G. Albrow10, P. Amaral7, S. R. Amendolia31, D. Amidei24, J. Antos1, G. Apollinari35, T. Arisawa42, T. Asakawa40, W. Ashmanskas7, M. Atac10, P. Azzi-Bacchetta29, N. Bacchetta29, M. W. Bailey26, S. Bailey14, P. de Barbaro34, A. Barbaro-Galtieri21, V. E. Barnes33, B. A. Barnett17, M. Barone12, G. Bauer22, F. Bedeschi31, S. Belforte39, G. Bellettini31, J. Bellinger43, D. Benjamin9, J. Bensinger4, A. Beretvas10, J. P. Berge10, J. Berryhill7, S. Bertolucci12, B. Bevensee30, A. Bhatti35, C. Bigongiari31, M. Binkley10, D. Bisello29, R. E. Blair2, C. Blocker4, K. Bloom24, S. Blusk34, A. Bocci31, A. Bodek34, W. Bokhari30, G. Bolla33, Y. Bonushkin5, D. Bortoletto33, J. Boudreau32, A. Brandl26, S. van den Brink17, C. Bromberg25, N. Bruner26, E. Buckley-Geer10, J. Budagov8, H. S. Budd34, K. Burkett14, G. Busetto29, A. Byon-Wagner10, K. L. Byrum2, M. Campbell24, A. Caner31, W. Carithers21, J. Carlson24, D. Carlsmith43, J. Cassada34, A. Castro29, D. Cauz39, A. Cerri31, P. S. Chang1, P. T. Chang1, J. Chapman24, C. Chen30, Y. C. Chen1, M. -T. Cheng1, M. Chertok37, G. Chiarelli31, I. Chirikov-Zorin8, G. Chlachidze8, F. Chlebana10, L. Christofek16, M. L. Chu1, S. Cihangir10, C. I. Ciobanu27, A. G. Clark13, M. Cobal31, E. Cocca31, A. Connolly21, J. Conway36, J. Cooper10, M. Cordelli12, J. Guimaraes da Costa24, D. Costanzo31, D. Cronin-Hennessy9, R. Cropp23, R. Culbertson7, D. Dagenhart41, F. DeJongh10, S. Dell’Agnello12, M. Dell’Orso31, R. Demina10, L. Demortier35, M. Deninno3, P. F. Derwent10, T. Devlin36, J. R. Dittmann10, S. Donati31, J. Done37, T. Dorigo14, N. Eddy16, K. Einsweiler21, J. E. Elias10, E. Engels, Jr.32, W. Erdmann10, D. Errede16, S. Errede16, Q. Fan34, R. G. Feild44, C. Ferretti31, I. Fiori3, B. Flaugher10, G. W. Foster10, M. Franklin14, J. Freeman10, J. Friedman22, Y. Fukui20, S. Gadomski23, S. Galeotti31, M. Gallinaro35, T. Gao30, M. Garcia-Sciveres21, A. F. Garfinkel33, P. Gatti29, C. Gay44, S. Geer10, D. W. Gerdes24, P. Giannetti31, P. Giromini12, V. Glagolev8, M. Gold26, J. Goldstein10, A. Gordon14, A. T. Goshaw9, Y. Gotra32, K. Goulianos35, H. Grassmann39, C. Green33, L. Groer36, C. Grosso-Pilcher7, M. Guenther33, G. Guillian24, R. S. Guo1, C. Haber21, E. Hafen22, S. R. Hahn10, C. Hall14, T. Handa15, R. Handler43, W. Hao38, F. Happacher12, K. Hara40, A. D. Hardman33, R. M. Harris10, F. Hartmann18, K. Hatakeyama35, J. Hauser5, J. Heinrich30, A. Heiss18, B. Hinrichsen23, K. D. Hoffman33, C. Holck30, R. Hollebeek30, L. Holloway16, R. Hughes27, J. Huston25, J. Huth14, H. Ikeda40, M. Incagli31, J. Incandela10, G. Introzzi31, J. Iwai42, Y. Iwata15, E. James24, H. Jensen10, M. Jones30, U. Joshi10, H. Kambara13, T. Kamon37, T. Kaneko40, K. Karr41, H. Kasha44, Y. Kato28, T. A. Keaffaber33, K. Kelley22, M. Kelly24, R. D. Kennedy10, R. Kephart10, D. Khazins9, T. Kikuchi40, M. Kirk4, B. J. Kim19, H. S. Kim23, S. H. Kim40, Y. K. Kim21, L. Kirsch4, S. Klimenko11, D. Knoblauch18, P. Koehn27, A. Köngeter18, K. Kondo42, J. Konigsberg11, K. Kordas23, A. Korytov11, E. Kovacs2, J. Kroll30, M. Kruse34, S. E. Kuhlmann2, K. Kurino15, T. Kuwabara40, A. T. Laasanen33, N. Lai7, S. Lami35, S. Lammel10, J. I. Lamoureux4, M. Lancaster21, G. Latino31, T. LeCompte2, A. M. Lee, IV9, S. Leone31, J. D. Lewis10, M. Lindgren5, T. M. Liss16, J. B. Liu34, Y. C. Liu1, N. Lockyer30, M. Loreti29, D. Lucchesi29, P. Lukens10, S. Lusin43, J. Lys21, R. Madrak14, K. Maeshima10, P. Maksimovic14, L. Malferrari3, M. Mangano31, M. Mariotti29, G. Martignon29, A. Martin44, J. A. J. Matthews26, P. Mazzanti3, K. S. McFarland34, P. McIntyre37, E. McKigney30, M. Menguzzato29, A. Menzione31, E. Meschi31, C. Mesropian35, C. Miao24, T. Miao10, R. Miller25, J. S. Miller24, H. Minato40, S. Miscetti12, M. Mishina20, N. Moggi31, E. Moore26, R. Moore24, Y. Morita20, A. Mukherjee10, T. Muller18, A. Munar31, P. Murat31, S. Murgia25, M. Musy39, J. Nachtman5, S. Nahn44, H. Nakada40, T. Nakaya7, I. Nakano15, C. Nelson10, D. Neuberger18, C. Newman-Holmes10, C.-Y. P. Ngan22, P. Nicolaidi39, H. Niu4, L. Nodulman2, A. Nomerotski11, S. H. Oh9, T. Ohmoto15, T. Ohsugi15, R. Oishi40, T. Okusawa28, J. Olsen43, C. Pagliarone31, F. Palmonari31, R. Paoletti31, V. Papadimitriou38, S. P. Pappas44, A. Parri12, D. Partos4, J. Patrick10, G. Pauletta39, M. Paulini21, A. Perazzo31, L. Pescara29, T. J. Phillips9, G. Piacentino31, K. T. Pitts10, R. Plunkett10, A. Pompos33, L. Pondrom43, G. Pope32, F. Prokoshin8, J. Proudfoot2, F. Ptohos12, G. Punzi31, K. Ragan23, D. Reher21, A. Ribon29, F. Rimondi3, L. Ristori31, W. J. Robertson9, A. Robinson23, T. Rodrigo6, S. Rolli41, L. Rosenson22, R. Roser10, R. Rossin29, W. K. Sakumoto34, D. Saltzberg5, A. Sansoni12, L. Santi39, H. Sato40, P. Savard23, P. Schlabach10, E. E. Schmidt10, M. P. Schmidt44, M. Schmitt14, L. Scodellaro29, A. Scott5, A. Scribano31, S. Segler10, S. Seidel26, Y. Seiya40, A. Semenov8, F. Semeria3, T. Shah22, M. D. Shapiro21, P. F. Shepard32, T. Shibayama40, M. Shimojima40, M. Shochet7, J. Siegrist21, G. Signorelli31, A. Sill38, P. Sinervo23, P. Singh16, A. J. Slaughter44, K. Sliwa41, C. Smith17, F. D. Snider10, A. Solodsky35, J. Spalding10, T. Speer13, P. Sphicas22, F. Spinella31, M. Spiropulu14, L. Spiegel10, L. Stanco29, J. Steele43, A. Stefanini31, J. Strologas16, F. Strumia13, D. Stuart10, K. Sumorok22, T. Suzuki40, R. Takashima15, K. Takikawa40, M. Tanaka40, T. Takano28, B. Tannenbaum5, W. Taylor23, M. Tecchio24, P. K. Teng1, K. Terashi40, S. Tether22, D. Theriot10, R. Thurman-Keup2, P. Tipton34, S. Tkaczyk10, K. Tollefson34, A. Tollestrup10, H. Toyoda28, W. Trischuk23, J. F. de Troconiz14, S. Truitt24, J. Tseng22, N. Turini31, F. Ukegawa40, J. Valls36, S. Vejcik, III,10, G. Velev31, R. Vidal10, R. Vilar6, I. Vologouev21, D. Vucinic22, R. G. Wagner2, R. L. Wagner10, J. Wahl7, N. B. Wallace36, A. M. Walsh36, C. Wang9, C. H. Wang1, M. J. Wang1, T. Watanabe40, T. Watts36, R. Webb37, H. Wenzel18, W. C. Wester, III,10, A. B. Wicklund2, E. Wicklund10, H. H. Williams30, P. Wilson10, B. L. Winer27, D. Winn24, S. Wolbers10, D. Wolinski24, J. Wolinski25, S. Worm26, X. Wu13, J. Wyss31, A. Yagil10, W. Yao21, G. P. Yeh10, P. Yeh1, J. Yoh10, C. Yosef25, T. Yoshida28, I. Yu19, S. Yu30, A. Zanetti39, F. Zetti21, 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 Los Angeles, Los Angeles, California 90024
6Instituto de Fisica de Cantabria, University of Cantabria, 39005 Santander, Spain
7Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
8Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
9Duke University, Durham, North Carolina 27708
10Fermi National Accelerator Laboratory, Batavia, Illinois 60510
11University of Florida, Gainesville, Florida 32611
12Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, Italy
13University of Geneva, CH-1211 Geneva 4, Switzerland
14Harvard University, Cambridge, Massachusetts 02138
15Hiroshima University, Higashi-Hiroshima 724, Japan
16University of Illinois, Urbana, Illinois 61801
17The Johns Hopkins University, Baltimore, Maryland 21218
18Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
19Korean Hadron Collider Laboratory, Kyungpook National University, Taegu 702-701, Korea;Seoul National University, Seoul 151-742, Korea;SungKyunKwan University, Suwon 440-746, Korea
20High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305, Japan
21Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720
22Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
23Institute of Particle Physics, McGill University, Montreal, Canada H3A 2T8University of Toronto, Toronto, Canada M5S 1A7
24University of Michigan, Ann Arbor, Michigan 48109
25Michigan State University, East Lansing, Michigan 48824
26University of New Mexico, Albuquerque, New Mexico 87131
27The Ohio State University, Columbus, Ohio 43210
28Osaka City University, Osaka 588, Japan
29Universita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
30University of Pennsylvania, Philadelphia, Pennsylvania 19104
31Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
32University of Pittsburgh, Pittsburgh, Pennsylvania 15260
33Purdue University, West Lafayette, Indiana 47907
34University of Rochester, Rochester, New York 14627
35Rockefeller University, New York, New York 10021
36Rutgers University, Piscataway, New Jersey 08855
37Texas A&M University, College Station, Texas 77843
38Texas Tech University, Lubbock, Texas 79409
39Istituto Nazionale di Fisica Nucleare, University of Trieste/Udine, Trieste, Italy
40University of Tsukuba, Tsukuba, Ibaraki 305, Japan
41Tufts University, Medford, Massachusetts 02155
42Waseda University, Tokyo 169, Japan
43University of Wisconsin, Madison, Wisconsin 53706
44Yale University, New Haven, Connecticut 06520
Received 29 July 1999; published 10 November 1999
The oscillation frequency Δmd of B0B0 mixing is measured using the partially reconstructed semileptonic decay B0→l-ν̅ D*+X. The data sample was collected with the CDF detector at the Fermilab Tevatron collider during 1992–1995 by triggering on the existence of two lepton candidates in an event, and corresponds to about 110 pb-1 of p̅ p collisions at √s=1.8 TeV. We estimate the proper decay time of the B0 meson from the measured decay length and reconstructed momentum of the l-D*+ system. The charge of the lepton in the final state identifies the flavor of the B0 meson at its decay. The second lepton in the event is used to infer the flavor of the B0 meson at production. We measure the oscillation frequency to be Δmd=0.516±0.099-0.035+0.029 ps-1, where the first uncertainty is statistical and the second is systematic.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.60.112004
DOI:
10.1103/PhysRevD.60.112004
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