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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

AutorAaltonen, T.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vilar, Rocío ; Vizán, J. ; CDF Collaboration
Fecha de publicación2016
EditorAmerican Physical Society
CitaciónPhysical Review D 93(11): 112016 (2016)
ResumenAt 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.
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Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.93.112016
URIhttp://hdl.handle.net/10261/140520
DOI10.1103/PhysRevD.93.112016
Identificadoresdoi: 10.1103/PhysRevD.93.112016
e-issn: 1550-2368
issn: 1550-7998
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