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Published November 13, 1989 | Published
Journal Article Open

Measurements of Z-boson resonance parameters in e+e- annihilation

Abrams, G. S.
Adolphsen, C. E.
Averill, D.
Ballam, J.
Barish, B. C.
Barklow, T.
Barnett, B. A.
Bartelt, J.
Bethke, S.
Blockus, D.
Bonvicini, G.
Boyarski, A.
Brabson, B.
Breakstone, A.
Brom, J. M.
Bulos, F.
Burchat, P. R.
Burke, D. L.
Cence, R. J.
Chapman, J.
Chmeissani, M.
Cords, D.
Coupal, D. P.
Dauncey, P.
DeStaebler, H. C.
Dorfan, D. E.
Dorfan, J. M.
Drewer, D. C.
Elia, R.
Feldman, G. J.
Fernandes, D.
Field, R. C.
Ford, W. T.
Fordham, C.
Frey, R.
Fujino, D.
Gan, K. K.
Gero, E.
Gidal, G.
Glanzman, T.
Goldhaber, G.
Gomez Cadenas, J. J.
Gratta, G.
Grindhammer, G.
Grosse-Wiesmann, P.
Hanson, G.
Harr, R.
Harral, B.
Harris, F. A.
Hawkes, C. M.
Hayes, K.
Hearty, C.
Heusch, C. A.
Hildreth, M. D.
Himel, T.
Hinshaw, D. A.
Hong, S. J.
Hutchinson, D.
Hylen, J.
Innes, R.
Jacobsen, R. G.
Jaros, J. A.
Jung, C. K.
Kadyk, J. A.
Kent, J.
King, M.
Klein, S. R.
Koetke, D. S.
Komamiya, S.
Koska, W.
Kowalski, L. A.
Kozanecki, W.
Kral, J. F.
Kuhlen, M.
Labarga, L.
Lankford, A. J.
Larsen, R. R.
Le Diberder, F.
Levi, M. E.
Litke, A. M.
Lou, X. C.
Lüth, V.
McKenna, J. A.
Matthews, J. A. J.
Mattison, T.
Milliken, B. D.
Moffeit, K. C.
Munger, C. T.
Murray, W. N.
Nash, J.
Ogren, H.
O'Shaughnessy, K. F.
Parker, S. I.
Peck, C.
Perl, M. L.
Perrier, F.
Petradza, M.
Pitthan, R.
Porter, F. C. ORCID icon
Rankin, P.
Riles, K.
Rouse, F. R.
Rust, D. R.
Sadrozinski, H. F. W.
Schaad, M. W.
Schumm, B. A.
Seiden, A.
Smith, J. G.
Snyder, A.
Soderstrom, E.
Stoker, D. P.
Stroynowski, R.
Swartz, M.
Thun, R.
Trilling, G. H.
Van Kooten, R.
Voruganti, P.
Wagner, S. R.
Watson, S.
Weber, P.
Weigend, A.
Weir, A. J.
Wicklund, E.
Woods, M.
Wu, D. Y.
Yurko, M.
Zaccardelli, C.
von Zanthier, C.
Weinstein, Alan J. ORCID icon


We have measured the mass of the Z boson to be 91.14±0.12 GeV/c^2, and its width to be 2.42-0.35+0.45 GeV. If we constrain the visible width to its standard-model value, we find the partial width to invisible decay modes to be 0.46±0.10 GeV, corresponding to 2.8±0.6 neutrino species, with a 95%-confidence-level upper limit of 3.9.

Additional Information

© 1989 The American Physical Society. Received 12 October 1989. This work was supported in part by Department of Energy Contracts No. DE-AC03-81ER40050 (California Institute of Technology), No. DE-AM03-76SF00010 (University of California, Santa Cruz), No. DE-AC02-86ER40253 (University of Colorado), No. DE-AC03-83ER40103 (University of Hawaii), No. DE-AC02-84ER40125 (Indiana University), No. DE-AC03-76SF00098 (LBL), No. DE-AC02-76ER01112 (University of Michigan), and No. DE-AC03-76SF00515 (SLAC), and by the National Science Foundation (Johns Hopkins University).

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