Phys. Rev. Lett.
74,
2890–2894
(1995)
Measurement of the Parity-Violation Parameter Ab from the Left-Right Forward-Backward Asymmetry of b Quark Production in Z0 Decays Using a Momentum-Weighted Track-Charge Technique
K. Abe et al. SLD Collaboration
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K. Abe29, I. Abt14, C. J. Ahn26, T. Akagi27, W. W. Ash27, D. Aston27, N. Bacchetta21, K. G. Baird24, C. Baltay33, H. R. Band32, M. B. Barakat33, G. Baranko10, O. Bardon16, T. Barklow27, A. O. Bazarko11, R. Ben-David33, A. C. Benvenuti2, T. Bienz27, G. M. Bilei22, D. Bisello21, G. Blaylock7, J. R. Bogart27, T. Bolton11, G. R. Bower27, J. E. Brau20, M. Breidenbach27, W. M. Bugg28, D. Burke27, T. H. Burnett31, P. N. Burrows16, W. Busza16, A. Calcaterra13, D. O. Caldwell6, D. Calloway27, B. Camanzi12, M. Carpinelli23, R. Cassell27, R. Castaldi23, A. Castro21, M. Cavalli-Sforza7, E. Church31, H. O. Cohn28, J. A. Coller3, V. Cook31, R. Cotton4, R. F. Cowan16, D. G. Coyne7, A. D'Oliveira8, C. J. S. Damerell25, S. Dasu27, R. De Sangro13, P. De Simone13, R. Dell'Orso23, M. Dima9, P. Y. C. Du28, R. Dubois27, B. I. Eisenstein14, R. Elia27, D. Falciai22, C. Fan10, M. J. Fero16, R. Frey20, K. Furuno20, T. Gillman25, G. Gladding14, S. Gonzalez16, G. D. Hallewell27, E. L. Hart28, Y. Hasegawa29, S. Hedges4, S. S. Hertzbach17, M. D. Hildreth27, J. Huber20, M. E. Huffer27, E. W. Hughes27, H. Hwang20, Y. Iwasaki29, P. Jacques24, J. Jaros27, A. S. Johnson3, J. R. Johnson32, R. A. Johnson8, T. Junk27, R. Kajikawa19, M. Kalelkar24, I. Karliner14, H. Kawahara27, H. W. Kendall16, Y. Kim26, M. E. King27, R. King27, R. R. Kofler17, N. M. Krishna10, R. S. Kroeger18, J. F. Labs27, M. Langston20, A. Lath16, J. A. Lauber10, D. W. G. Leith27, X. Liu7, M. Loreti21, A. Lu6, H. L. Lynch27, J. Ma31, G. Mancinelli22, S. Manly33, G. Mantovani22, T. W. Markiewicz27, T. Maruyama27, R. Massetti22, H. Masuda27, E. Mazzucato12, A. K. McKemey4, B. T. Meadows8, R. Messner27, P. M. Mockett31, K. C. Moffeit27, B. Mours27, G. Müller27, D. Muller27, T. Nagamine27, U. Nauenberg10, H. Neal27, M. Nussbaum8, Y. Ohnishi19, L. S. Osborne16, R. S. Panvini30, H. Park20, T. J. Pavel27, I. Peruzzi13, L. Pescara21, M. Piccolo13, L. Piemontese12, E. Pieroni23, K. T. Pitts20, R. J. Plano24, R. Prepost32, C. Y. Prescott27, G. D. Punkar27, J. Quigley16, B. N. Ratcliff27, T. W. Reeves30, P. E. Rensing27, L. S. Rochester27, J. E. Rothberg31, P. C. Rowson11, J. J. Russell27, O. H. Saxton27, T. Schalk7, R. H. Schindler27, U. Schneekloth16, B. A. Schumm15, A. Seiden7, S. Sen33, V. V. Serbo32, M. H. Shaevitz11, J. T. Shank3, G. Shapiro15, S. L. Shapiro27, D. J. Sherden27, C. Simopoulos27, N. B. Sinev20, S. R. Smith27, J. A. Snyder33, P. Stamer24, H. Steiner15, R. Steiner1, M. G. Strauss17, D. Su27, F. Suekane29, A. Sugiyama19, S. Suzuki19, M. Swartz27, A. Szumilo31, T. Takahashi27, F. E. Taylor16, E. Torrence16, J. D. Turk33, T. Usher27, J. Va'vra27, C. Vannini23, E. Vella27, J. P. Venuti30, P. G. Verdini23, S. R. Wagner27, A. P. Waite27, S. J. Watts4, A. W. Weidemann28, J. S. Whitaker3, S. L. White28, F. J. Wickens25, D. A. Williams7, D. C. Williams16, S. H. Williams27, S. Willocq33, R. J. Wilson9, W. J. Wisniewski5, M. Woods27, G. B. Word24, J. Wyss21, R. K. Yamamoto16, J. M. Yamartino16, X. Yang20, S. J. Yellin6, C. C. Young27, H. Yuta29, G. Zapalac32, R. W. Zdarko27, C. Zeitlin20, and J. Zhou20 (SLD Collaboration)
1Adelphi University, Garden City, New York 11530
2Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, I-40126 Bologna, Italy
3Boston University, Boston, Massachusetts 02215
4Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
5California Institute of Technology, Pasadena, California 91125
6University of California at Santa Barbara, Santa Barbara, California 93106
7University of California at Santa Cruz, Santa Cruz, California 95064
8University of Cincinnati, Cincinnati, Ohio 45221
9Colorado State University, Fort Collins, Colorado 80523
10University of Colorado, Boulder, Colorado 80309
11Columbia University, New York, New York 10027
12Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Università di Ferrara, I-44100 Ferrara, Italy
13Istituto Nazionale di Fisica Nucleare, Laboratory Nazionali di Frascati, I-00044 Frascati, Italy
14University of Illinois, Urbana, Illinois 61801
15Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
16Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
17University of Massachusetts, Amherst, Massachusetts 01003
18University of Mississippi, University, Mississippi 38677
19Nagoya University, Chikusa-ku, Nagoya 464, Japan
20University of Oregon, Eugene, Oregon 97403
21Istituto Nazionale di Fisica Nucleare, Sezione di Padova and Università di Padova, I-35100 Padova, Italy
22Istituto Nazionale di Fisica Nucleare, Sezione di Perugia and Università di Perugia, I-06100 Perugia, Italy
23Istituto Nazionale di Fisica Nucleare, Sezione di Pisa and Università di Pisa, I-56100 Pisa, Italy
24Rutgers University, Piscataway, New Jersey 08855
25Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
26Sogang University, Seoul, Korea
27Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
28University of Tennessee, Knoxville, Tennessee 37996
29Tohoku University, Sendai 980, Japan
30Vanderbilt University, Nashville, Tennessee 37235
31University of Washington, Seattle, Washington 98195
32University of Wisconsin, Madison, Wisconsin 53706
33Yale University, New Haven, Connecticut 06511
Received 3 October 1994; published in the issue dated 10 April 1995
Using an impact parameter tag to select an enriched sample of Z0→bb̅ events, and the net momentum-weighted track charge to identify the sign of the charge of the underlying b quark, we have measured the left-right forward-backward asymmetry for b quark production as a function of polar angle. Based on 1.8pb-1 of Z0 decay data produced with a mean electron beam polarization of Pe = 63%, this yields a direct measurement of the extent of parity violation in the Zbb coupling of Ab = 0.87±0.11(stat)±0.09(syst).
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.2890
DOI:
10.1103/PhysRevLett.74.2890
PACS:
13.38.Dg, 11.30.Er, 14.65.Fy, 14.70.Hp
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