Phys. Rev. Lett.
81,
942–946
(1998)
Direct Measurement of Parity Violation in the Coupling of Z0 Bosons to b Quarks Using a Mass Tag and Momentum-Weighted Track Charge
K. Abe et al. (SLD Collaboration)
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K. Abe2, K. Abe19, T. Abe27, I. Adam27, T. Akagi27, N. J. Allen4, A. Arodzero20, W. W. Ash27, D. Aston27, K. G. Baird15, C. Baltay37, H. R. Band36, M. B. Barakat14, O. Bardon17, T. L. Barklow27, J. M. Bauer16, G. Bellodi21, R. Ben-David37, A. C. Benvenuti3, G. M. Bilei23, D. Bisello22, G. Blaylock15, J. R. Bogart27, B. Bolen16, G. R. Bower27, J. E. Brau20, M. Breidenbach27, W. M. Bugg30, D. Burke27, T. H. Burnett35, P. N. Burrows21, A. Calcaterra11, D. O. Caldwell32, D. Calloway27, B. Camanzi10, M. Carpinelli24, R. Cassell27, R. Castaldi24, A. Castro22, M. Cavalli-Sforza33, A. Chou27, E. Church35, H. O. Cohn30, J. A. Coller5, M. R. Convery27, V. Cook35, R. Cotton4, R. F. Cowan17, D. G. Coyne33, G. Crawford27, C. J. S. Damerell25, M. N. Danielson7, M. Daoudi27, N. de Groot27, R. Dell'Orso23, P. J. Dervan4, R. de Sangro11, M. Dima9, A. D'Oliveira6, D. N. Dong17, P. Y. C. Du30, R. Dubois27, B. I. Eisenstein12, V. Eschenburg16, E. Etzion36, S. Fahey7, D. Falciai11, C. Fan7, J. P. Fernandez33, M. J. Fero17, K. Flood15, R. Frey20, T. Gillman25, G. Gladding12, S. Gonzalez17, E. L. Hart30, J. L. Harton9, A. Hasan4, K. Hasuko31, S. J. Hedges5, S. S. Hertzbach15, M. D. Hildreth27, J. Huber20, M. E. Huffer27, E. W. Hughes27, X. Huynh27, H. Hwang20, M. Iwasaki20, D. J. Jackson25, P. Jacques26, J. A. Jaros27, Z. Y. Jiang27, A. S. Johnson27, J. R. Johnson36, R. A. Johnson6, T. Junk27, R. Kajikawa19, M. Kalelkar26, Y. Kamyshkov30, H. J. Kang26, I. Karliner12, H. Kawahara27, Y. D. Kim28, R. King27, M. E. King27, R. R. Kofler15, N. M. Krishna7, R. S. Kroeger16, M. Langston20, A. Lath17, D. W. G. Leith27, V. Lia17, C.-J. S. Lin27, X. Liu33, M. X. Liu37, M. Loreti22, A. Lu32, H. L. Lynch27, J. Ma35, G. Mancinelli26, S. Manly37, G. Mantovani23, T. W. Markiewicz27, T. Maruyama27, H. Masuda27, E. Mazzucato10, A. K. McKemey4, B. T. Meadows6, G. Menegatti10, R. Messner27, P. M. Mockett35, K. C. Moffeit27, T. B. Moore37, M. Morii27, D. Muller27, V. Murzin18, T. Nagamine31, S. Narita31, U. Nauenberg7, H. Neal27, M. Nussbaum6, N. Oishi19, D. Onoprienko30, L. S. Osborne17, R. S. Panvini34, H. Park20, C. H. Park29, T. J. Pavel27, I. Peruzzi11, M. Piccolo11, L. Piemontese10, E. Pieroni24, K. T. Pitts20, R. J. Plano26, R. Prepost36, C. Y. Prescott27, G. D. Punkar27, J. Quigley17, B. N. Ratcliff27, T. W. Reeves34, J. Reidy16, P. L. Reinertsen33, P. E. Rensing27, L. S. Rochester27, P. C. Rowson8, J. J. Russell27, O. H. Saxton27, T. Schalk33, R. H. Schindler27, B. A. Schumm33, J. Schwiening27, S. Sen37, V. V. Serbo36, M. H. Shaevitz8, J. T. Shank5, G. Shapiro13, D. J. Sherden27, K. D. Shmakov30, C. Simopoulos27, N. B. Sinev20, S. R. Smith27, M. B. Smy9, J. A. Snyder37, H. Staengle9, A. Stahl27, P. Stamer26, H. Steiner13, R. Steiner1, M. G. Strauss15, D. Su27, F. Suekane31, A. Sugiyama19, S. Suzuki19, M. Swartz27, A. Szumilo35, T. Takahashi27, F. E. Taylor17, J. Thom27, E. Torrence17, N. K. Toumbas27, A. I. Trandafir15, J. D. Turk37, T. Usher27, C. Vannini24, J. Va'vra27, E. Vella27, J. P. Venuti34, R. Verdier17, P. G. Verdini24, S. R. Wagner27, D. L. Wagner7, A. P. Waite27, S. Walston20, J. Wang27, C. Ward4, S. J. Watts4, A. W. Weidemann30, E. R. Weiss35, J. S. Whitaker5, S. L. White30, F. J. Wickens25, B. Williams7, D. C. Williams17, S. H. Williams27, S. Willocq27, R. J. Wilson9, W. J. Wisniewski27, J. L. Wittlin15, M. Woods27, G. B. Word34, T. R. Wright36, J. Wyss22, R. K. Yamamoto17, J. M. Yamartino17, X. Yang20, J. Yashima31, S. J. Yellin32, C. C. Young27, H. Yuta2, G. Zapalac36, R. W. Zdarko27, and J. Zhou20 (SLD Collaboration)
1Adelphi University, South Avenue, Garden City, New York 11530
2Aomori University, 2-3-1 Kohata, Aomori City, 030 Japan
3INFN Sezione di Bologna, Via Irnerio 46, I-40126 Bologna, Italy
4Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
5Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215
6University of Cincinnati, Cincinnati, Ohio 45221
7University of Colorado, Campus Box 390, Boulder, Colorado 80309
8Columbia University, Nevis Laboratories, P.O. Box 137, Irvington, New York 10533
9Colorado State University, Ft. Collins, Colorado 80523
10INFN Sezione di Ferrara, Via Paradiso 12, I-44100 Ferrara, Italy
11Laboratori Nazionali di Frascati, Casella Postale 13, I-00044 Frascati, Italy
12University of Illinois, 1110 West Green Street, Urbana, Illinois 61801
13Lawrence Berkeley Laboratory, Department of Physics 50B-5211, University of California, Berkeley, California 94720
14Physics Department, Louisiana Technical University, P.O. Box 3044, Ruston, Louisiana 71272
15University of Massachusetts, Amherst, Massachusetts 01003
16University of Mississippi, University, Mississippi 38677
17Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
18Moscow State University, Institute of Nuclear Physics, 119899 Moscow, Russia
19Nagoya University, Nagoya 464, Japan
20University of Oregon, Department of Physics, Eugene, Oregon 97403
21Oxford University, Oxford OX1 3RH, United Kingdom
22Universita di Padova, Via F. Marzolo 8, I-35100 Padova, Italy
23Universita di Perugia, Sezione INFN, Via A. Pascoli, I-06100 Perugia, Italy
24INFN, Sezione di Pisa, Via Livornese, 582/AS Piero a Grado I-56010, Pisa, Italy
25Rutherford Appleton Laboratory, Chiton, Didcot, Oxon OX11 0QX, United Kingdom
26Rutgers University, Serin Physics Labs, Piscataway, New Jersey 08855-0849
27Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, California 94025
28Sogang University, Ricci Hall Seoul, Korea
29Soongsil University, Dongjakgu Sangdo 5 dong 1-1, Seoul, Korea 156-743
30University of Tennessee, 401 A.H. Nielsen Physics Building, Knoxville, Tennessee 37996-1200
31Tohoku University, Bubble Chamber Laboratory, Aramaki, Sendai 980, Japan
32University of California—Santa Barbara, 3019 Broida Hall, Santa Barbara, California 93106
33University of California—Santa Cruz, Santa Cruz, California 95064
34Vanderbilt University, Stevenson Center, Room 5333, P.O. Box 1807, Station B, Nashville, Tennessee 37235
35University of Washington, Seattle, Washington 98105
36University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706
37Yale University, 5th Floor Gibbs Laboratory, P.O. Box 208121, New Haven, Connecticut 06520-8121
Received 6 April 1998; published in the issue dated 3 August 1998
We present a direct measurement of the parity-violation parameter Ab using a self-calibrating track-charge technique. In the SLAC Linear Collider Large Detector (SLD) experiment we observe hadronic decays of Z0 bosons produced in collisions between longitudinally polarized electrons and unpolarized positrons at the SLAC Linear Collider. A sample of bb̅ events is selected using the topologically reconstructed mass of B hadrons. From our 1993–1995 sample of approximately 150 000 hadronic Z0 decays, we obtain Ab = 0.911±0.045(stat)±0.045(syst).
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.942
DOI:
10.1103/PhysRevLett.81.942
PACS:
13.38.Dg, 11.30.Er, 14.65.Fy
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