A Precise Determination Of The W-Mass And Z-Mass At The Cern Pbarp Collider

J. Alitti,R. Ansari,R.E. Ansorge,D. Autiero, P. Bagnaia,P. Bareyre,G. Blaylock,P. Bonamy,M. Bonesini,C.N. Booth,K. Borer, D. Buskulic,G. Carboni, D. Cavalli, V. Cavasinni,P. Cenci,J.C. Chollet,A.G. Clark, C. Conta,G. Costa,F. Costantini,J. Crittenden, A. Dell'Acqua,B. De Lotto,T. del Prete,R.S. de Wolf,L. di Lella,G.F. Egan,K.F. Einsweiler,L. Fayard,A. Federspiel,R. Ferrari, M. Fraternali, D. Froidevaux, G. Fumagalli,J.M. Gaillard, F. Gianotti,O. Gildemeister,C. Gössling,V.G. Goggi,S. Grünendahl,J.R. Hansen, K. Hara,S. Hellman,E. Hugentobler, K. Hultqvist,E. Iacopini, J. Incandela, K. Jakobs,P. Jenni,E.E. Kluge,N. Kurz,S. Lami, P. Lariccia, M. Lefebvre,L. Linssen,M. Livan,P. Lubrano,C. Magneville, L. Mandelli, L. Mapelli, M. Mazzanti,K. Meier,B. Merkel,J.P. Meyer,M. Moniez,R. Moning,M. Morganti,L. Müller,D.J. Munday,C. Onions,T. Pal,M.A. Parker,G. Parrour,F. Pastore,E. Pennacchio,J.M. Pentney,M. Pepe,L. Perini, C. Petridou,P. Petroff,H. Plothow-Besch, G. Polesello, A. Poppleton,M. Primavera,L. Rasmussen,J.P. Repellin, A. Rimoldi,J.G. Rushbrooke,P. Scampoli,J. Schacher,S.L. Singh, S. Stapnes,A.V. Stirling,S.N. Tovey, G. Unal,M. Valdata-Nappi,V. Vercesi,A.R. Weidberg,P.S. Wells,T.O. White,D.R. Wood,S.A. Wotton,H. Zaccone

PHYSICS LETTERS B（1990）

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摘要

The UA2 experiment has collected large samples of W and Z events during recent runs at the CERN p p Collider at s = 630 GeV . These samples have been used to perform precise measurements of the masses of the W and Z bosons. After a careful analysis of systematic errors, an improved result is obtained for the mass ratio m w m z . This provides a new value for the weak mixing parameter sin 2 θ w . Furthermore, it can be combined with recent measurements of the Z mass from e + e − colliders to give an absolute measurement of the W mass, leading to the result m w =80.49±0.43 (stat) ± 0.24 (syst) GeV .

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