Combined analysis of the unitarity triangle and CP violation in the Standard Model

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dc.creatorCiuchini, M.
dc.creatorFranco, E.
dc.creatorGiusti, L.
dc.creatorLubicz, V.
dc.creatorMartinelli, G.
dc.date1999-10-05
dc.date.accessioned2026-07-07T11:09:54Z
dc.date.available2026-07-07T11:09:54Z
dc.descriptionWe perform a combined analysis of the unitarity triangle and of the CP violating parameter epsilon'/epsilon using the most recent determination of the relevant experimental data and, whenever possible, hadronic matrix elements from lattice QCD. We discuss the role of the main non-perturbative parameters and make a comparison with other recent analyses. We use lattice results for the matrix element of Q_8 obtained without reference to the strange quark mass. Since a reliable lattice determination of the matrix element of Q_6 is still missing, the theoretical predictions for epsilon'/epsilon suffer from large uncertainties. By evaluating this matrix element with the vacuum-saturation approximation, we typically find as central value epsilon'/epsilon = (4 - 7) x 10^(-4). We conclude that the experimental data suggest large deviation of the value of the matrix element of Q_6 from the vacuum-saturation approximation, possibly due to penguin contractions.
dc.descriptionLaTeX2e, 31 pages. 5 eps figures included
dc.identifierhttps://arxiv.org/abs/hep-ph/9910236
dc.identifierhttp://arxiv.org/abs/hep-ph/9910236
dc.identifierNucl.Phys.B573:201-222,2000
dc.identifierdoi:10.1016/S0550-3213(99)00807-X
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190627
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCombined analysis of the unitarity triangle and CP violation in the Standard Model
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