Phys. Rev. D
47,
R2639–R2643
(1993)
Search for Λb→J/ψΛ0 in pp̅ collisions at √s=1.8 TeV
F. Abe et al. (CDF Collaboration)
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F. Abe11, D. Amidei14, C. Anway-Wiese3, G. Apollinari20, M. Atac6, P. Auchincloss19, P. Azzi15, A. R. Baden8, N. Bacchetta15, W. Badgett14, M. W. Bailey18, A. Bamberger6, P. de Barbaro19, A. Barbaro-Galtieri12, V. E. Barnes18, B. A. Barnett10, G. Bauer13, T. Baumann8, F. Bedeschi17, S. Behrends2, S. Belforte17, G. Bellettini17, J. Bellinger25, D. Benjamin24, J. Benlloch6, J. Bensinger2, A. Beretvas6, J. P. Berge6, S. Bertolucci7, K. Biery16, S. Bhadra9, M. Binkley6, D. Bisello15, R. Blair1, C. Blocker2, A. Bodek19, V. Bolognesi17, A. W. Booth6, C. Boswell10, G. Brandenburg8, D. Brown8, E. Buckley-Geer21, H. S. Budd19, G. Busetto15, A. Byon-Wagner6, K. L. Byrum25, C. Campagnari6, M. Campbell14, A. Caner6, R. Carey8, W. Carithers12, D. Carlsmith25, J. T. Carroll6, R. Cashmore6, A. Castro15, F. Cervelli17, K. Chadwick6, J. Chapman14, G. Chiarelli7, W. Chinowsky12, S. Cihangir6, A. G. Clark6, M. Cobal17, D. Connor16, M. Contreras4, J. Cooper6, M. Cordelli7, D. Crane6, J. D. Cunningham2, C. Day6, F. DeJongh6, S. Dell'Agnello17, M. Dell'Orso17, L. Demortier2, B. Denby6, P. F. Derwent14, T. Devlin21, D. DiBitonto22, M. Dickson20, R. B. Drucker12, K. Einsweiler12, J. E. Elias6, R. Ely12, S. Eno4, S. Errede9, A. Etchegoyen6, B. Farhat13, G. J. Feldman8, B. Flaugher6, G. W. Foster6, M. Franklin8, J. Freeman6, H. Frisch4, T. Fuess6, Y. Fukui11, A. F. Garfinkel18, A. Gauthier9, S. Geer6, D. W. Gerdes4, P. Giannetti17, N. Giokaris20, P. Giromini7, L. Gladney16, M. Gold12, J. Gonzalez16, K. Goulianos20, H. Grassmann15, G. M. Grieco17, R. Grindley16, C. Grosso-Pilcher4, C. Haber12, S. R. Hahn6, R. Handler25, K. Hara23, B. Harral16, R. M. Harris6, S. A. Hauger5, J. Hauser3, C. Hawk21, T. Hessing22, R. Hollebeek16, L. Holloway9, S. Hong14, P. Hu21, B. Hubbard12, B. T. Huffman18, R. Hughes16, P. Hurst8, J. Huth6, J. Hylen6, M. Incagli17, T. Ino23, H. Iso23, H. Jensen6, C. P. Jessop8, R. P. Johnson6, U. Joshi6, R. W. Kadel12, T. Kamon22, S. Kanda23, D. A. Kardelis9, I. Karliner9, E. Kearns8, L. Keeble22, R. Kephart6, P. Kesten2, R. M. Keup9, H. Keutelian6, D. Kim6, S. B. Kim14, S. H. Kim23, Y. K. Kim12, L. Kirsch2, K. Kondo23, J. Konigsberg8, K. Kordas16, E. Kovacs6, M. Krasberg14, S. E. Kuhlmann1, E. Kuns21, A. T. Laasanen18, S. Lammel3, J. I. Lamoureux25, S. Leone17, J. D. Lewis6, W. Li1, P. Limon6, M. Lindgren3, T. M. Liss9, N. Lockyer16, M. Loreti15, E. H. Low16, D. Lucchesi17, C. B. Luchini9, P. Lukens6, P. Maas25, K. Maeshima6, M. Mangano17, J. P. Marriner6, M. Mariotti17, R. Markeloff25, L. A. Markosky25, R. Mattingly2, P. McIntyre22, A. Menzione17, E. Meschi17, T. Meyer22, S. Mikamo11, M. Miller4, T. Mimashi23, S. Miscetti7, M. Mishina11, S. Miyashita23, Y. Morita23, S. Moulding2, J. Mueller21, A. Mukherjee6, T. Muller3, L. F. Nakae2, I. Nakano23, C. Nelson6, D. Neuberger3, C. Newman-Holmes6, J. S. T. Ng8, M. Ninomiya23, L. Nodulman1, S. Ogawa23, R. Paoletti17, V. Papadimitriou6, A. Para6, E. Pare8, S. Park6, J. Patrick6, G. Pauletta17, L. Pescara15, T. J. Phillips5, F. Ptohos8, R. Plunkett6, L. Pondrom25, J. Proudfoot1, G. Punzi17, D. Quarrie6, K. Ragan16, G. Redlinger4, J. Rhoades25, M. Roach24, F. Rimondi6, L. Ristori17, W. J. Robertson5, T. Rodrigo6, T. Rohaly16, A. Roodman4, W. K. Sakumoto19, A. Sansoni7, R. D. Sard9, A. Savoy-Navarro6, V. Scarpine9, P. Schlabach8, E. E. Schmidt6, O. Schneider12, M. H. Schub18, R. Schwitters8, A. Scribano17, S. Segler6, Y. Seiya23, G. Sganos16, M. Shapiro12, N. M. Shaw18, M. Sheaff25, M. Shochet4, J. Siegrist12, P. Sinervo16, J. Skarha10, K. Sliwa24, A. Spies10, D. A. Smith17, F. D. Snider10, L. Song6, T. Song14, M. Spahn12, P. Sphicas13, R. St. Denis8, L. Stanco6, A. Stefanini17, G. Sullivan4, K. Sumorok13, R. L. Swartz, Jr.9, M. Takano23, K. Takikawa23, S. Tarem2, F. Tartarelli17, S. Tether13, D. Theriot6, M. Timko24, P. Tipton19, S. Tkaczyk6, A. Tollestrup6, J. Tonnison18, W. Trischuk8, Y. Tsay4, J. Tseng10, N. Turini17, F. Ukegawa23, D. Underwood1, S. Vejcik, III10, R. G. Wagner1, R. L. Wagner6, N. Wainer6, R. C. Walker19, J. Walsh16, G. Watts19, T. Watts21, R. Webb22, C. Wendt25, H. Wenzel17, W. C. Wester, III12, T. Westhusing9, S. N. White20, A. B. Wicklund1, E. Wicklund6, H. H. Williams16, B. L. Winer19, J. Wolinski22, D. Wu14, J. Wyss15, A. Yagil6, K. Yasuoka23, Y. Ye16, G. P. Yeh6, C. Yi16, J. Yoh6, M. Yokoyama23, J. C. Yun6, A. Zanetti17, F. Zetti17, S. Zhang14, W. Zhang16, and S. Zucchelli6 (CDF Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439
2Brandeis University, Waltham, Massachusetts 02254
3University of California at Los Angeles, Los Angeles, California 90024
4University of Chicago, Chicago, Illinois 60637
5Duke University, Durham, North Carolina 27706
6Fermi National Accelerator Laboratory, Batavia, Illinois 60510
7Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy
8Harvard University, Cambridge, Massachusetts 02138
9University of Illinois, Urbana, Illinois 61801
10The Johns Hopkins University, Baltimore, Maryland 21218
11National Laboratory for High Energy Physics (KEK), Japan
12Lawrence Berkeley Laboratory, Berkeley, California 94720
13Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
14University of Michigan, Ann Arbor, Michigan 48109
15Università di Padova, Instituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
16University of Pennsylvania, Philadelphia, Pennsylvania 19104
17Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
18Purdue University, West Lafayette, Indiana 47907
19University of Rochester, Rochester, New York 15627
20Rockefeller University, New York, New York 10021
21Rutgers University, Piscataway, New Jersey 08854
22Texas A&M University, College Station, Texas 77843
23University of Tsukuba, Tsukuba, Ibaraki 305, Japan
24Tufts University, Medford, Massachusetts 02155
25University of Wisconsin, Madison, Wisconsin 53706
Received 28 September 1992; published in the issue dated 1 April 1993
We have searched for the b-flavored baryon decay Λb→J/ψΛ0 in pp̅ collisions at √s=1.8 TeV with the Collider Detector at Fermilab (CDF). In the J/ψΛ0 invariant-mass distribution we observe a flat distribution and a small number of events, consistent with no signal. Using the b-quark cross section measured by the CDF we put an upper limit on the b→Λb production fraction times the branching ratio F(Λb)B(Λb→J/ψΛ0) of 0.50×10-3 at 90% confidence level.
© 1993 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.47.R2639
DOI:
10.1103/PhysRevD.47.R2639
PACS:
13.85.Rm, 13.30.Eg, 14.20.Kp
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