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A precise determination of the W and Z masses at the CERN pp 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

Physics Letters B（1990）

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Abstract
The UA2 experiment has collected large samples of W and Z events during recent runs at the CERN pp 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 mwmz. This provides a new value for the weak mixing parameter sin2θw. 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 mw=80.49±0.43 (stat) ± 0.24 (syst) GeV.
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