Drell-Yan lepton pairs are produced in the process p (p) over bar -> e(+)e(-) + X through an intermediate gamma*/Z boson. The lepton angular distributions are used to provide information on the electroweak-mixing parameter sin(2)theta(W) via its observable effective-leptonic sisin(2)theta(W), or sin(2)theta(lept)(eff). A new method to infer sin(2)theta(W) or, equivalently, the W-boson mass MW in the on-shell scheme, is developed and tested using a previous CDF Run II measurement of angular distributions from electron pairs in a sample corresponding to 2.1 fb(-1) of integrated luminosity from p (p) over bar collisions at a center-of-momentum energy of 1.96 TeV. The value of ssin(2)theta(lept)(eff) is found to be 0.2328 +/- 0.0011. Within a specified context of the standard model, this results in sin(2)theta(W) = 0.2246 +/- 0.0011, which corresponds to a W-boson mass of 80.297 +/- 0.055 GeV/c2, in agreement with previous determinations in electron-position collisions and at the Tevatron collider.

Indirect measurement of sin(2)theta(W) (M-W) using e(+)e(-) pairs in the Z-boson region with p(p)over-bar collisions at a center-of-momentum energy of 1.96 TeV

AMERIO, SILVIA;BUSETTO, GIOVANNI;LUCCHESI, DONATELLA;
2013

Abstract

Drell-Yan lepton pairs are produced in the process p (p) over bar -> e(+)e(-) + X through an intermediate gamma*/Z boson. The lepton angular distributions are used to provide information on the electroweak-mixing parameter sin(2)theta(W) via its observable effective-leptonic sisin(2)theta(W), or sin(2)theta(lept)(eff). A new method to infer sin(2)theta(W) or, equivalently, the W-boson mass MW in the on-shell scheme, is developed and tested using a previous CDF Run II measurement of angular distributions from electron pairs in a sample corresponding to 2.1 fb(-1) of integrated luminosity from p (p) over bar collisions at a center-of-momentum energy of 1.96 TeV. The value of ssin(2)theta(lept)(eff) is found to be 0.2328 +/- 0.0011. Within a specified context of the standard model, this results in sin(2)theta(W) = 0.2246 +/- 0.0011, which corresponds to a W-boson mass of 80.297 +/- 0.055 GeV/c2, in agreement with previous determinations in electron-position collisions and at the Tevatron collider.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2806166
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