Initial measurements of Z-boson resonance parameters in e+e- annihilation

Creators: Abrams, G. S.; Adolphsen, C. E.; Aleksan, R.; Alexander, J. P.; Allen, M. A.; Atwood, W. B.; Averill, D.; Ballam, J.; Bambade, P.; Barish, B. C.; Barklow, T.; Barnett, B. A.; Bartelt, J.; Bethke, S.; Blockus, D.; de Boer, W.; Bonvicini, G.; Boyarski, A.; Brabson, B.; Breakstone, A.; Breidenbach, M.; Brom, J. M.; Brown, J. L.; Brown, K. L.; Bulos, F.; Burchat, P. R.; Burke, D. L.; Cence, R. J.; Chapman, J.; Chmeissani, M.; Clendenin, J.; Cords, D.; Coupal, D. P.; Dauncey, P.; Dean, N. R.; DeStaebler, H. C.; Dorfan, D. E.; Dorfan, J. M.; Drell, P. S.; Drewer, D. C.; Dydak, F.; Ecklund, S.; Elia, R.; Erickson, R. A.; Fay, J.; Feldman, G. J.; Fernandes, D.; Field, R. C.; Fieguth, T. H.; Fischer, G. E.; Ford, W. T.; Fordham, C.; Frey, R.; Fujino, D.; Gan, K. K.; Gatto, C.; 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.; Herrup, D.; Heusch, C. A.; Hildreth, M. D.; Himel, T.; Hinshaw, D. A.; Holmgren, S. O.; Hong, S. J.; Hutchinson, D.; Hutton, A.; Hylen, J.; Innes, W. R.; Jacobsen, R. G.; Jaffre, M.; Jaros, J. A.; Jobe, R. K.; Jung, C. K.; Kadyk, J. A.; Karlen, D.; Kent, J.; King, M.; Klein, S. R.; Koetke, D. S.; Komamiya, S.; Koska, W.; Kowalski, L. A.; Kozanecki, W.; Kral, J. F.; Kuhlen, M.; Kulikov, A. V.; Labarga, L.; Lankford, A. J.; Larsen, R. R.; Le Diberder, F.; Levi, M. E.; Litke, A. M.; Lohse, T.; Lüth, V.; Lynch, G. R.; McKenna, J. A.; Matthews, J. A. J.; Mattison, T.; Milliken, B. D.; Moffeit, K. C.; Munger, C. T.; Murray, J. J.; Murray, W. N.; Nash, J.; Ogren, H.; Ong, R. A.; O'Shaughnessy, K. F.; Parker, S. I.; Peck, C.; Perl, M. L.; Perrier, F.; Petersen, A.; Petradza, M.; Phinney, N.; Pitthan, R.; Porter, F. C.; Rankin, P.; Rees, J. R.; Richman, J. D.; Riles, K.; Rivkin, L.; Ross, M. C.; Rouse, F. R.; Rust, D. R.; Sadrozinski, H. F. W.; Schaad, M. W.; Schalk, T. L.; Schumm, B. A.; Schwarz, A. S.; Seeman, J. T.; Seiden, A.; Sheppard, J. C.; Smith, J. G.; Snyder, A.; Soderstrom, E.; Stiening, R.; Stoker, D. P.; Stroynowski, R.; Swartz, M.; Thun, R.; Toge, N.; Trilling, G. H.; Van Kooten, R.; Voruganti, P.; Wagner, S. R.; Watson, S.; Weber, P.; Weigend, A.; Weir, A. J.; White, S. L.; Wicklund, E.; Wolf, R. C.; Wood, D. R.; Woods, M.; Wormser, G.; Wright, R.; Wu, D. Y.; Yurko, M.; Zaccardelli, C.; von Zanthier, C.; Weinstein, A. J.

Abstract

We have measured the mass of the Z boson to be 91.11±0.23 GeV/c^2, and its width to be 1.61-0.43+0.60 GeV. If we constrain the visible width to its standard-model value, we find the partial width to invisible decay modes to be 0.62±0.23 GeV, corresponding to 3.8±1.4 neutrino species.

Additional Information

© 1989 American Physical Society. Received 24 July 1989. We express our profound appreciation to the SLAC staff for the dedicated and monumental effort of bringing the technology of linear e + e - colliders to fruition. We also thank Robert Cahn, Bryan Lynn, and Michael Peskin for assistance with the interpretation of the measurements. This work was supported in part by the Department of Energy Contracts No. DE-AC03-81 ER40050 (California Institute of Technology), No. DE-AM03-76SFOOOI0 (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 (LBO, No. DE-AC02-76EROll12 (University of Michigan), and No. DE-AC03-76SF-00515 (SLAC), and by the National Science Foundation (Johns Hopkins University).

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