Measurement of sin2θlepteff using e+e pairs from γ/Z bosons produced in pp collisions at a center-of-momentum energy of 1.96 TeV

Mark Lancaster, T Aaltonen, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, J A Appel, T. Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, B. Auerbach, A. Aurisano, F. Azfar

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    Abstract

    At the Fermilab Tevatron proton-antiproton (pp) collider, Drell-Yan lepton pairs are produced in the process pp→e+e+X through an intermediate γ/Z boson. The forward-backward asymmetry in the polar-angle distribution of the e as a function of the e+e -pair mass is used to obtain sin2θlepteff, the effective leptonic determination of the electroweak-mixing parameter sin2θW. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.4 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 sin2θlepteff is found to be 0.23248 ± 0.00053. The combination with the previous CDF measurement based on μ+μ pairs yields sin2θlepteff = 0.23221 ± 0.00046. This result, when interpreted within the specified context of the standard model assuming sin2θW=1−M2W/M2Z and that the W- and Z-boson masses are on-shell, yields sin2θW=0.22400±0.00045, or equivalently a W-boson mass of 80.328 ± 0.024 GeV/c2.
    Original languageEnglish
    Pages (from-to)112016
    Number of pages29
    JournalPhysical Review D (Particles, Fields, Gravitation and Cosmology)
    Volume93
    Issue number11
    DOIs
    Publication statusPublished - 28 Jun 2016

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