Possible Indications of New Physics in Bd-mixing and in sin(2 beta) Determinations

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dc.creatorLunghi, Enrico
dc.creatorSoni, Amarjit
dc.date2008-03-30
dc.date2008-07-08
dc.date.accessioned2026-07-07T11:49:27Z
dc.date.available2026-07-07T11:49:27Z
dc.descriptionUsing the hadronic matrix elements from the lattice, B_K and xi_s, involving only the 4-quark operators for Delta flavor (F) = 2 Hamiltonian relevant for K, B_d and B_s mixing, along with V_cb, we deduce a non-trivial constraint on the SM, sin (2 beta) = 0.87+-0.09. This deviates from direct experimental measurements via the tree process, b -> c c s as well as the one via the penguin-loop b -> s decays by around 2.1 and 2.7 sigma respectively. If these deviations are confirmed they would imply the presence of new physics rather pervasively in both B_d mixing (i.e. very likely in b -> d) as well as in b -> s transitions requiring a beyond the SM CP-odd phase. Consequently, improvements in the relevant lattice calculations should be given a high priority.
dc.description4 pages, 2 eps figures. References added. A corrected expression for epsilon_K, following the paper from Buras and Guadagnoli (arXiv:0805.3887), is used and small changes in the numerics due to the new formula are propagated
dc.identifierhttps://arxiv.org/abs/0803.4340
dc.identifierhttp://arxiv.org/abs/0803.4340
dc.identifierPhys.Lett.B666:162-165,2008
dc.identifierdoi:10.1016/j.physletb.2008.07.015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203241
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Lattice
dc.titlePossible Indications of New Physics in Bd-mixing and in sin(2 beta) Determinations
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