Benchmarks for the New-Physics Search through CP Violation in B^0->pi^0 K_S

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dc.creatorFleischer, Robert
dc.creatorJager, Sebastian
dc.creatorPirjol, Dan
dc.creatorZupan, Jure
dc.date2008-06-18
dc.date2008-11-26
dc.date.accessioned2026-07-07T12:22:22Z
dc.date.available2026-07-07T12:22:22Z
dc.descriptionUsing isospin relations, we predict the Standard-Model correlation between S_{pi^0 K_S}=(sin 2beta)_{pi^0 K_S} and A_{pi^0 K_S}, the mixing-induced and direct CP asymmetries of B^0-> pi^0 K_S. The calculation uses flavour SU(3) only to fix the isospin-3/2 amplitude through the B^\pm->pi^\pm pi^0 branching ratio, and thus has a small irreducible theoretical error. It can reach percent level precision thanks to expected future lattice-QCD progress for the calculation of the relevant SU(3)-breaking form-factor ratio, and serves as a benchmark for new-physics searches. We obtain an interesting picture in the A_{pi^0 K_S} - S_{pi^0 K_S} plane, where the current experimental data show a discrepancy with the Standard Model, and comment on the direct CP asymmetries of B^0->pi^-K^+ and B^+ -> pi^0 K^+. A modified electroweak penguin with a large new CP-violating phase can explain the discrepancy and allows us to accommodate also the corresponding data for other b->s penguin-dominated decays.
dc.description4+1 pages, 7 figures, update to ICHEP08 data, to appear as Rapid Communication in Physical Review D
dc.identifierhttps://arxiv.org/abs/0806.2900
dc.identifierhttp://arxiv.org/abs/0806.2900
dc.identifierPhys.Rev.D78:111501,2008
dc.identifierdoi:10.1103/PhysRevD.78.111501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213632
dc.subjectHigh Energy Physics - Phenomenology
dc.titleBenchmarks for the New-Physics Search through CP Violation in B^0->pi^0 K_S
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