Phys. Rev. Lett.
88,
151801
(2002)
[5 pages]
Improved Direct Measurement of Ab and Ac at the Z0 Pole Using a Lepton Tag
Kenji Abe et al. (SLD Collaboration)
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Kenji Abe15, Koya Abe24, T. Abe21, I. Adam21, H. Akimoto21, D. Aston21, K. G. Baird11, C. Baltay30, H. R. Band29, T. L. Barklow21, J. M. Bauer12, G. Bellodi17, R. Berger21, G. Blaylock11, J. R. Bogart21, G. R. Bower21, J. E. Brau16, M. Breidenbach21, W. M. Bugg23, D. Burke21, T. H. Burnett28, P. N. Burrows17, A. Calcaterra8, R. Cassell21, A. Chou21, H. O. Cohn23, J. A. Coller4, M. R. Convery21, V. Cook28, R. F. Cowan13, G. Crawford21, C. J. S. Damerell19, M. Daoudi21, N. de Groot2, R. de Sangro8, D. N. Dong21, M. Doser21, R. Dubois21, I. Erofeeva14, V. Eschenburg12, S. Fahey5, D. Falciai8, J. P. Fernandez26, K. Flood11, R. Frey16, E. L. Hart23, K. Hasuko24, S. S. Hertzbach11, M. E. Huffer21, X. Huynh21, M. Iwasaki16, D. J. Jackson19, P. Jacques20, J. A. Jaros21, Z. Y. Jiang21, A. S. Johnson21, J. R. Johnson29, R. Kajikawa15, M. Kalelkar20, H. J. Kang20, R. R. Kofler11, R. S. Kroeger12, M. Langston16, D. W. G. Leith21, V. Lia13, C. Lin11, G. Mancinelli20, S. Manly30, G. Mantovani18, T. W. Markiewicz21, T. Maruyama21, A. K. McKemey3, R. Messner21, K. C. Moffeit21, T. B. Moore30, M. Morii21, D. Muller21, V. Murzin14, S. Narita24, U. Nauenberg5, H. Neal30, G. Nesom17, N. Oishi15, D. Onoprienko23, L. S. Osborne13, R. S. Panvini27, C. H. Park22, I. Peruzzi8, M. Piccolo8, L. Piemontese7, R. J. Plano20, R. Prepost29, C. Y. Prescott21, B. N. Ratcliff21, J. Reidy12, P. L. Reinertsen26, L. S. Rochester21, P. C. Rowson21, J. J. Russell21, O. H. Saxton21, T. Schalk26, B. A. Schumm26, J. Schwiening21, V. V. Serbo21, G. Shapiro10, N. B. Sinev16, J. A. Snyder30, H. Staengle6, A. Stahl21, P. Stamer20, H. Steiner10, D. Su21, F. Suekane24, A. Sugiyama15, S. Suzuki15, M. Swartz9, F. E. Taylor13, J. Thom21, E. Torrence13, T. Usher21, J. Va'vra21, R. Verdier13, D. L. Wagner5, A. P. Waite21, S. Walston16, A. W. Weidemann23, E. R. Weiss28, J. S. Whitaker4, S. H. Williams21, S. Willocq11, R. J. Wilson6, W. J. Wisniewski21, J. L. Wittlin11, M. Woods21, T. R. Wright29, R. K. Yamamoto13, J. Yashima24, S. J. Yellin25, C. C. Young21, and H. Yuta1 (SLD Collaboration)
1Aomori University, Aomori, 030 Japan
2University of Bristol, Bristol, United Kingdom
3Brunel University, Uxbridge, Middlesex, UB8 3PH United Kingdom
4Boston University, Boston, Massachusetts 02215
5University of Colorado, Boulder, Colorado 80309
6Colorado State University, Ft. Collins, Colorado 80523
7INFN Sezione di Ferrara and Universita di Ferrara, I-44100 Ferrara, Italy
8INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
9Johns Hopkins University, Baltimore, Maryland 21218-2686
10Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
11University of Massachusetts, Amherst, Massachusetts 01003
12University of Mississippi, University, Mississippi 38677
13Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
14Institute of Nuclear Physics, Moscow State University, Moscow, Russia
15Nagoya University Chikusa-ku, Nagoya, 464 Japan
16University of Oregon, Eugene, Oregon 97403
17Oxford University Oxford, OX1 3RH, United Kingdom
18INFN Sezione di Perugia and Universita di Perugia, I-06100 Perugia, Italy
19Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX United Kingdom
20Rutgers University, Piscataway, New Jersey 08855
21Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
22Soongsil University, Seoul, Korea 156-743
23University of Tennessee, Knoxville, Tennessee 37996
24Tohoku University, Sendai 980, Japan
25University of California at Santa Barbara, Santa Barbara, California 93106
26University of California at Santa Cruz, Santa Cruz, California 95064
27Vanderbilt University, Nashville, Tennessee 37235
28University of Washington, Seattle, Washington 98105
29University of Wisconsin, Madison, Wisconsin 53706
30Yale University, New Haven, Connecticut 06511
Received 13 November 2001; published 27 March 2002
The parity violation parameters Ab and Ac of the Zbb̅ and Zcc̅ couplings have been measured directly, using the polar angle dependence of the polarized cross sections at the Z0 pole. Bottom and charmed hadrons were tagged via their semileptonic decays. Both the electron and muon analyses take advantage of new multivariate techniques to increase the analyzing power. Based on the 1993–1998 SLD sample of 550 000 Z0 decays produced with highly polarized electron beams, we measure Ab = 0.919±0.030stat±0.024syst, and Ac = 0.583±0.055stat±0.055syst.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.151801
DOI:
10.1103/PhysRevLett.88.151801
PACS:
11.30.Er, 12.15.Ji, 13.10.+q, 13.38.Dg
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