Phys. Rev. Lett.
78,
17–21
(1997)
First Measurement of the Left-Right Charge Asymmetry in Hadronic Z Boson Decays and a New Determination of sin2θWeff
K. Abe et al. (SLD Collaboration)
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K. Abe19, K. Abe30, I. Abt13, T. Akagi28, N. J. Allen4, W. W. Ash28, D. Aston28, K. G. Baird16, 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, M. J. Fero15, R. Frey20, K. Furuno20, T. Gillman25, G. Gladding13, S. Gonzalez15, G. D. Hallewell28, E. L. Hart29, J. L. Harton8, A. Hasan4, Y. Hasegawa30, K. Hasuko30, S. 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, 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, 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, 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, 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
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
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
11Istituto Nazionale di Fisica Nucleare Sezione di Ferrara and Università di Ferrara, I-44100 Ferrara, Italy
12Istituto Nazionale di Fisica Nucleare Laboratorio Nazionali di Frascati, I-00044 Frascati, Italy
13University of Illinois, Urbana, Illinois 61801
14Lawrence 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
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
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 30 August 1996; published in the issue dated 6 January 1997
We present the first measurement of the left-right charge asymmetry AQobs in hadronic Z boson decays. This was performed at Ec.m. = 91.27GeV with the SLD at the SLAC Linear Collider with a polarized electron beam. Using 89 838 events we obtain AQobs = 0.225±0.056±0.019, which leads to a measurement of the electron left-right asymmetry parameter, Ae = 0.162±0.041±0.014, and sin2θWeff = 0.2297±0.0052±0.0018. Also, the AQobs measurement combined with the left-right cross section asymmetry determines Ae independent of the value of the electron-beam polarization.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.17
DOI:
10.1103/PhysRevLett.78.17
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