CP Violation and the CKM Matrix

Beneke, Μ.

doi:10.1007/978-3-0348-7907-1_7

Cited by 1 publication

(2 citation statements)

References 56 publications

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“…However, the recent BaBar data on B → γℓν [49] seems to imply a larger λ B (> 300 MeV at the 90% CL). While NNLO corrections can in principle push the magnitude of a 2 (ππ) up to the order of 0.40 by lowering the value of the B meson parameter λ B , the strong phase of a 2 relative to a 1 cannot be larger than 15 • [47]. In this work we reply on ρ C and φ C to get a large magnitude and strong phase for a 2 .…”

Section: Penguin Annihilationmentioning

confidence: 80%

“…The NNLO calculations of spectator-scattering tree amplitudes and vertex corrections at order α 2 s have been carried out in [45] and [46], respectively. As pointed out in [47,48], a smaller value of λ B can enhance the hard spectator interaction and hence a 2 substantially. For example, a 2 (ππ) ∼ 0.375 − 0.076i for λ B = 200 MeV was found in [48].…”

Section: Penguin Annihilationmentioning

confidence: 86%

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Revisiting charmless hadronicBu,ddecays in QCD factorization

Cheng

Chua

2009

Phys. Rev. D

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Within the framework of QCD factorization (QCDF), we consider two different types of power correction effects in order to resolve the CP puzzles and rate deficit problems with penguin-dominated two-body decays of B mesons and color-suppressed tree-dominated π 0 π 0 and ρ 0 π 0 modes: penguin annihilation and soft corrections to the color-suppressed tree amplitude. We emphasize that the electroweak penguin solution to the B → Kπ CP puzzle via New Physics is irrelevant for solving the CP and rate puzzles related to tree-dominated decays. While some channels e.g. K − π + , K − ρ 0 , π + π − , ρ ± π ∓ need penguin annihilation to induce the correct magnitudes and signs for their CP violation, some other decays such as B − → K − π 0 , π − η, K − η andB 0 →K * 0 η, π 0 π 0 require the presence of both power corrections to account for the measured CP asymmetries. In general, QCDF predictions for the branching fractions and direct CP asymmetries ofB → PP,V P,VV decays are in good agreement with experiment. The predictions of pQCD and soft-collinear effective theory are included for comparison.

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Section: Penguin Annihilationmentioning

confidence: 80%