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 sin2θ_lept_eff, the effective leptonic determination of the electroweak-mixing parameter sin2θ_W. 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 sin2θ_lept_eff is found to be 0.23248±0.00053. The combination with the previous CDF measurement based on μ+μ− pairs yields sin2θ_lept_eff=0.23221±0.00046. This result, when interpreted within the specified context of the standard model assuming sin2θ_W=1−M2W/M2Z and that the W- and Z-boson masses are on-shell, yields sin2θ_W=0.22400±0.00045, or equivalently a W-boson mass of 80.328±0.024  GeV/c2.

Measurement of sin2θ_eff_lept using e+e- pairs from γ∗/Z bosons produced in pp collisions at a center-of-momentum energy of 1.96 TeV

CAUZ, Diego;PAULETTA, Giovanni;SANTI, Lorenzo Gianni;
2016

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 sin2θ_lept_eff, the effective leptonic determination of the electroweak-mixing parameter sin2θ_W. 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 sin2θ_lept_eff is found to be 0.23248±0.00053. The combination with the previous CDF measurement based on μ+μ− pairs yields sin2θ_lept_eff=0.23221±0.00046. This result, when interpreted within the specified context of the standard model assuming sin2θ_W=1−M2W/M2Z and that the W- and Z-boson masses are on-shell, yields sin2θ_W=0.22400±0.00045, or equivalently a W-boson mass of 80.328±0.024  GeV/c2.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11390/1083990
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