Measurement of sin2θ.sup.lept./sup..sub.eff./sub. using e.sup.+./sup.e.sup.−./sup. pairs from γ.sup.∗./sup./Z bosons produced in pp¯ collisions at a center-of-momentum energy of 1.96 TeV

0501353 - FZÚ 2019 RIV US eng J - Journal Article
Aaltonen, T. - Amerio, S. - Amidei, D. - Lysák, Roman … Total 396 authors
Measurement of sin2θ^lept_eff using e⁺e⁻ pairs from γ^∗/Z bosons produced in pp¯ collisions at a center-of-momentum energy of 1.96 TeV.
Physical Review D. Roč. 93, č. 11 (2016), s. 1-29, č. článku 112016. ISSN 2470-0010. E-ISSN 2470-0029
Institutional support: RVO:68378271
Keywords : Batavia TEVATRON Coll * 1960 GeV-cms * CDF * experimental results * Drell-Yan process * electroweak interaction * Weinberg angle
OECD category: Particles and field physics
Impact factor: 4.557, year: 2016

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 sin2θefflept, 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 sin2θefflept is found to be 0.23248±0.00053. The combination with the previous CDF measurement based on μ+μ- pairs yields sin2θefflept=0.23221±0.00046. This result, when interpreted within the specified context of the standard model assuming sin2θW=1-MW2/MZ2 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.

Permanent Link: http://hdl.handle.net/11104/0293341