Phys. Rev. Lett.
84,
5945–5949
(2000)
High-Precision Measurement of the Left-Right Z Boson Cross-Section Asymmetry
Kenji Abe et al. (The 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, S. Dasu29, N. de Groot2, R. de Sangro8, D. N. Dong13, M. Doser21, R. Dubois21, I. Erofeeva14, V. Eschenburg12, E. Etzion29, S. Fahey5, D. Falciai8, J. P. Fernandez26, M. J. Fero13, 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, H. J. Kang20, M. Kalelkar20, 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, M. Swartz9, F. E. Taylor13, J. Thom21, E. Torrence13, T. Usher21, J. Va'vra21, R. Verdier13, D. L. Wagner5, A. P. Waite21, S. Walston16, J. Wang21, 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 (The 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, 119899, 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 17 April 2000; published in the issue dated 26 June 2000
We present a measurement of the left-right cross-section asymmetry ( ALR) for Z boson production by e+e- collisions. The measurement includes the final data taken with the SLD detector at the SLAC Linear Collider during the period 1996–1998. Using a sample of 383 487 Z decays collected during the 1996–1998 runs we measure the pole value of the asymmetry, ALR0, to be 0.15056±0.00239 which is equivalent to an effective weak mixing angle of sin2θWeff = 0.23107±0.00030. Our result for the complete 1992–1998 data set comprising approximately 537 000 Z decays is sin2θWeff = 0.23097±0.00027.
© 2000 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.5945
DOI:
10.1103/PhysRevLett.84.5945
PACS:
13.38.Dg, 12.15.Ji, 13.10.+q
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