Four-fermion production near the W pair production threshold

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dc.creatorBeneke, Martin
dc.creatorFalgari, Pietro
dc.creatorSchwinn, Christian
dc.creatorSigner, Adrian
dc.creatorZanderighi, Giulia
dc.date2007-07-05
dc.date2007-10-23
dc.date.accessioned2026-07-07T11:17:34Z
dc.date.available2026-07-07T11:17:34Z
dc.descriptionWe perform a dedicated study of the four-fermion production process e- e+ -> mu- nubar_mu u dbar X near the W pair-production threshold in view of the importance of this process for a precise measurement of the W boson mass. Accurate theoretical predictions for this process require a systematic treatment of finite-width effects. We use unstable-particle effective field theory (EFT) to perform an expansion in the coupling constants, GammaW/MW, and the non-relativistic velocity v of the W boson up to next-to-leading order in GammaW/MW ~ alpha_ew ~ v^2. We find that the dominant theoretical uncertainty in MW is currently due to an incomplete treatment of initial-state radiation. The remaining uncertainty of the NLO EFT calculation translates into delta MW ~ 10-15 MeV, and to about 5 MeV with additional input from the NLO four-fermion calculation in the full theory.
dc.description53 pages, v2: version to be published, inessential modifications
dc.identifierhttps://arxiv.org/abs/0707.0773
dc.identifierhttp://arxiv.org/abs/0707.0773
dc.identifierNucl.Phys.B792:89-135,2008
dc.identifierdoi:10.1016/j.nuclphysb.2007.09.030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193049
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleFour-fermion production near the W pair production threshold
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