Indirect measurement of sin2 θW (or MW ) using µ +µ − pairs from γ ∗/Z bosons produced in pp¯ collisions at a center-of-momentum energy of 1.96 TeV

Aaltonen, T. and Amerio, S. and Amidei, D. and Anastassov, A. and Annovi, A. and Antos, J. and Apollinari, G. and Appel, J. A. and Arisawa, T. and Artikov, A. and Asaadi, J. and Ashmanskas, W. and Auerbach, B. and Aurisano, A. and Azfar, F. and Badgett, W. and Bae, T. and Barbaro-Galtieri, A. and Barnes, V. E. and Barnett, B. A. and Barria, P. and Bartos, P. and Bauce, M. and Bedeschi, F. and Behari, S. and Bellettini, G. and Bellinger, J. and Benjamin, D. and Beretvas, A. and Bhatti, A. and Nagai, Yoshikazu (2014) Indirect measurement of sin2 θW (or MW ) using µ +µ − pairs from γ ∗/Z bosons produced in pp¯ collisions at a center-of-momentum energy of 1.96 TeV. PHYSICAL REVIEW D, 89 (7). ISSN 2470-0010

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Abstract

Drell-Yan lepton pairs are produced in the process pp¯ → µ +µ − +X through an intermediate γ ∗ /Z boson. The forward-backward asymmetry in the polar-angle distribution of the µ − as a function of the invariant mass of the µ +µ − pair is used to obtain the effective leptonic determination sin2 θ lept eff of the electroweak-mixing parameter sin2 θW , from which the value of sin2 θW is derived assuming the standard model. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.2 fb−1 of integrated luminosity from pp¯ collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of sin2 θ lept eff is found to be 0.2315 ± 0.0010, where statistical and systematic uncertainties are combined in quadrature. When interpreted within the context of the standard model using the on-shell renormalization scheme, where sin2 θW = 1 − M2 W /M2 Z , the measurement yields sin2 θW = 0.2233 ± 0.0009, or equivalently a W-boson mass of 80.365 ± 0.047 GeV/c2 . The value of the W-boson mass is in agreement with previous determinations in electron-positron collisions and at the Tevatron collider.

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