Phys. Rev. Lett.
79,
804–808
(1997)
Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z Bosons
K. Abe et al. (SLD Collaboration)
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K. Abe19, K. Abe30, T. Akagi28, N. J. Allen4, W. W. Ash28, D. Aston28, K. G. Baird24, C. Baltay34, H. R. Band33, M. B. Barakat34, G. Baranko9, O. Bardon15, T. L. Barklow28, G. L. Bashindzhagyan18, A. O. Bazarko10, R. Ben-David34, A. C. Benvenuti2, G. M. Bilei22, D. Bisello21, G. Blaylock16, J. R. Bogart28, B. Bolen17, T. Bolton10, G. R. Bower28, J. E. Brau20, M. Breidenbach28, W. M. Bugg29, D. Burke28, T. H. Burnett32, P. N. Burrows15, W. Busza15, A. Calcaterra12, D. O. Caldwell5, D. Calloway28, B. Camanzi11, M. Carpinelli23, R. Cassell28, R. Castaldi23, A. Castro21, M. Cavalli-Sforza6, A. Chou28, E. Church32, H. O. Cohn29, J. A. Coller3, V. Cook32, R. Cotton4, R. F. Cowan15, D. G. Coyne6, G. Crawford28, A. D'Oliveira7, C. J. S. Damerell25, M. Daoudi28, R. De Sangro12, R. Dell'Orso23, P. J. Dervan4, M. Dima8, D. N. Dong15, P. Y. C. Du29, R. Dubois28, B. I. Eisenstein13, R. Elia28, E. Etzion33, S. Fahey9, D. Falciai22, C. Fan9, J. P. Fernandez6, M. J. Fero15, R. Frey20, K. Furuno20, T. Gillman25, G. Gladding13, S. Gonzalez15, E. L. Hart29, J. L. Harton8, A. Hasan4, Y. Hasegawa30, K. Hasuko30, S. J. Hedges3, S. S. Hertzbach16, M. D. Hildreth28, J. Huber20, M. E. Huffer28, E. W. Hughes28, H. Hwang20, Y. Iwasaki30, D. J. Jackson25, P. Jacques24, J. A. Jaros28, Z. Y. Jiang28, A. S. Johnson3, J. R. Johnson33, R. A. Johnson7, T. Junk28, R. Kajikawa19, M. Kalelkar24, H. J. Kang26, I. Karliner13, H. Kawahara28, H. W. Kendall15, Y. D. Kim26, M. E. King28, R. King28, R. R. Kofler16, N. M. Krishna9, R. S. Kroeger17, J. F. Labs28, M. Langston20, A. Lath15, J. A. Lauber9, D. W. G. S. Leith28, V. Lia15, M. X. Liu34, X. Liu6, M. Loreti21, A. Lu5, H. L. Lynch28, J. Ma32, G. Mancinelli22, S. Manly34, G. Mantovani22, T. W. Markiewicz28, T. Maruyama28, H. Masuda28, E. Mazzucato11, A. K. McKemey4, B. T. Meadows7, R. Messner28, P. M. Mockett32, K. C. Moffeit28, T. B. Moore34, D. Muller28, T. Nagamine28, S. Narita30, U. Nauenberg9, H. Neal28, M. Nussbaum7, Y. Ohnishi19, D. Onoprienko29, L. S. Osborne15, R. S. Panvini31, C. H. Park27, H. Park20, T. J. Pavel28, I. Peruzzi12, M. Piccolo12, L. Piemontese11, E. Pieroni23, K. T. Pitts20, R. J. Plano24, R. Prepost33, C. Y. Prescott28, G. D. Punkar28, J. Quigley15, B. N. Ratcliff28, T. W. Reeves31, J. Reidy17, P. L. Reinertsen6, P. E. Rensing28, L. S. Rochester28, P. C. Rowson10, J. J. Russell28, O. H. Saxton28, T. Schalk6, R. H. Schindler28, B. A. Schumm6, J. Schwiening28, S. Sen34, V. V. Serbo33, M. H. Shaevitz10, J. T. Shank3, G. Shapiro14, D. J. Sherden28, K. D. Shmakov29, C. Simopoulos28, N. B. Sinev20, S. R. Smith28, M. B. Smy8, J. A. Snyder34, P. Stamer24, H. Steiner14, R. Steiner1, M. G. Strauss16, D. Su28, F. Suekane30, A. Sugiyama19, S. Suzuki19, M. Swartz28, A. Szumilo32, T. Takahashi28, F. E. Taylor15, E. Torrence15, A. I. Trandafir16, J. D. Turk34, T. Usher28, J. Va'vra28, C. Vannini23, E. Vella28, J. P. Venuti31, R. Verdier15, P. G. Verdini23, D. L. Wagner9, S. R. Wagner28, A. P. Waite28, S. J. Watts4, A. W. Weidemann29, E. R. Weiss32, J. S. Whitaker3, S. L. White29, F. J. Wickens25, D. A. Williams6, D. C. Williams15, S. H. Williams28, S. Willocq28, R. J. Wilson8, W. J. Wisniewski28, M. Woods28, G. B. Word24, J. Wyss21, R. K. Yamamoto15, J. M. Yamartino15, X. Yang20, J. Yashima30, S. J. Yellin5, C. C. Young28, H. Yuta30, G. Zapalac33, R. W. Zdarko28, and J. Zhou20 (SLD Collaboration)
1Adelphi University, Garden City, New York 11530
2INFN Sezione di Bologna, I-40126 Bologna, Italy
3Boston University, Boston, Massachusetts 02215
4Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom
5University of California at Santa Barbara, Santa Barbara, California 93106
6University of California at Santa Cruz, Santa Cruz, California 95064
7University of Cincinnati, Cincinnati, Ohio 45221
8Colorado State University, Fort Collins, Colorado 80523
9University of Colorado, Boulder, Colorado 80309
10Columbia University, New York, New York 10027
11INFN Sezione di Ferrara and Università di Ferrara, I-44100 Ferrara, Italy
12INFN Laboratorio Nazionali di Frascati, I-00044 Frascati, Italy
13University of Illinois, Urbana, Illinois 61801
14E. O. Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
15Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
16University of Massachusetts, Amherst, Massachusetts 01003
17University of Mississippi, University, Mississippi 38677
18Moscow State University, Institute of Nuclear Physics, 119899 Moscow, Russia
19Nagoya University, Chikusa-ku, Nagoya 464 Japan
20University of Oregon, Eugene, Oregon 97403
21INFN Sezione di Padova and Università di Padova, I-35100 Padova, Italy
22INFN Sezione di Perugia and Università di Perugia, I-06100 Perugia, Italy
23INFN 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
27Soongsil University, Seoul, Korea 156-743
28Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
29University of Tennessee, Knoxville, Tennessee 37996
30Tohoku University, Sendai 980 Japan
31Vanderbilt University, Nashville, Tennessee 37235
32University of Washington, Seattle, Washington 98195
33University of Wisconsin, Madison, Wisconsin 53706
34Yale University, New Haven, Connecticut 06511
Received 1 April 1997; published in the issue dated 4 August 1997
We present direct measurements of the Z0-lepton coupling asymmetry parameters Ae, Aμ, and Aτ, based on a data sample of 12 063 leptonic Z0 decays collected by the SLD detector. The Z bosons are produced in collisions of beams of polarized e- with unpolarized e+ at the SLAC Linear Collider. The couplings are extracted from the measurement of the left-right and forward-backward asymmetries for each lepton species. The results are Ae = 0.152±0.012(stat)±0.001(syst), Aμ = 0.102±0.034±0.002, and Aτ = 0.195±0.034±0.003.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.804
DOI:
10.1103/PhysRevLett.79.804
PACS:
12.15.Mm, 13.10.+q, 13.38.Dg
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