Charmless B→VV decays in QCD factorization implications of recent measurement

Cheng, Hai-Yang; Yang, Kwei-Chou

doi:10.1016/s0370-2693(01)00606-2

Cited by 86 publications

(55 citation statements)

References 14 publications

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“…(7.8). A similar result is also obtained in the BSW model [77]. However, a much larger branching ratio will be obtained if the form factors based on light-cone sum rules [79,80] are employed.…”

Section: Polarization In B → φK * ρK * Decayssupporting

confidence: 73%

“…As pointed out in [77], in the heavy quark limit, both vector mesons in the charmless B → V V decays should have zero helicity and the corresponding amplitude is governed by the form factor A 0 . Consequently, the predicted branching ratios are rather sensitive to the form factor models of A 0 and can be easily different by a factor of 2.…”

Section: Polarization In B → φK * ρK * Decaysmentioning

confidence: 89%

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Final state interactions in hadronicBdecays

2005

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There exist many experimental indications that final-state interactions (FSIs) may play a prominent role not only in charmful B decays but also in charmless B ones. We examine the final-state rescattering effects on the hadronic B decay rates and their impact on direct CP violation. The color-suppressed neutral modes such as B 0 → D 0 π 0 , π 0 π 0 , ρ 0 π 0 , K 0 π 0 can be substantially enhanced by long-distance rescattering effects. The direct CP -violating partial rate asymmetries in charmless B decays to ππ/πK and ρπ are significantly affected by final-state rescattering and their signs are generally different from that predicted by the short-distance approach. For example, direct CP asymmetry in B 0 → ρ 0 π 0 is increased to around 60% due to final state rescattering effects whereas the short-distance picture gives about 1%. Evidence of direct CP violation in the decay B 0 → K − π + is now established, while the combined BaBar and Belle measurements of B 0 → ρ ± π ∓ imply a 3.6σ direct CP asymmetry in the ρ + π − mode. Our predictions for CP violation agree with experiment in both magnitude and sign, whereas the QCD factorization predictions (especially for ρ + π − ) seem to have some difficulty with the data. Direct CP violation in the decay B − → π − π 0 is very small ( < ∼ 1%) in the Standard Model even after the inclusion of FSIs. Its measurement will provide a nice way to search for New Physics as in the Standard Model QCD penguins cannot contribute (except by isospin violation). Current data on πK modes seem to violate the isospin sum rule relation, suggesting the presence of electroweak penguin contributions. We have also investigated whether a large transverse polarization in B → φK * can arise from the final-state rescattering of D ( * )D ( * ) s into φK * . While the longitudinal polarization fraction can be reduced significantly from short-distance predictions due to such FSI effects, no sizable perpendicular polarization is found owing mainly to the large cancellations occurring in the processes B → D * sD → φK * and B → D sD * → φK * and this can be understood as a consequence of CP and SU(3) [CPS] symmetry. To fully account for the polarization anomaly (especially the perpendicular polarization) observed in B → φK * , FSI from other states or other mechanism, e.g. the penguin-induced annihilation, may have to be invoked. Our conclusion is that the small value of the longitudinal polarization in V V modes cannot be regarded as a clean signal for New Physics.

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Section: Polarization In B → φK * ρK * Decayssupporting

confidence: 73%

Section: Polarization In B → φK * ρK * Decaysmentioning

confidence: 89%

Final state interactions in hadronicBdecays

2005

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“…However PQCD predicts 10 × 10 −6 [22,34]. For B → φK * decays, QCDF gets about 9 × 10 −6 [30], but PQCD have 15 × 10 −6 [35]. Because of these small branching ratios for B → PV and VV decays in QCD-factorization approach, they can not globally fit the experimental data for B → PP,V P and VV modes simultaneously with same sets of free parameters (ρ H , φ H ) and (ρ A , φ A ) [31].…”

Section: Power Counting Rule In Pqcdmentioning

confidence: 96%

Possible large directCPviolations in charmlessBmeson decays: Summary report on the PQCD method

Keum

Sanda

2003

Phys. Rev. D

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We discuss the perturbative QCD approach for the exclusive two body B-meson decays to light mesons. We briefly review its ingredients and some important theoretical issues on factorization approach. We show numerical results which are compatible with present experimantal data for the charmless B-meson decays. Specailly we predict the possibility of large direct CP violation effects in B 0 → π + π − (23 ± 7%) and B 0 → K + π − (−17 ± 5%). In the last section we investigate two methods to determine the weak phases φ 2 and φ 3 from B → ππ, Kπ processes. We obtain bounds on φ 2 and φ 3 from present experimental measurements.Talk given by Y.-Y. Keum at the 3rd workshop on Higher Luminosity B Factory,

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“…with Φ B 1 (ρ) being one of the two light-cone distribution amplitudes of the B meson [21,24]. G h ,Ĝ h , C h e andĈ h e , originating from QCD and electroweak contractions, respectively, are given by 27) andĈ h e can be obtained from C h e with the replacement G h →Ĝ h , where small electroweak corrections from c 7−10 are neglected in C h e andĈ h e .…”

Section: )mentioning

confidence: 99%

Publisher’s Note: Annihilation in factorization-suppressedBdecays involving a1P11meson and search for new-physics signals [Phys. Rev. D72, 034009 (2005)]

Yang¹

2005

Phys. Rev. D

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The recent measurements of large transverse fractions in B → φK * decays represent a challenge for theory. It was shown that the QCD penguin annihilation could contribute to the transverse amplitudes such that the observation could be accounted for in the Standard Model. However, if one resorts to new physics for resolutions, then the relevant 4-quark operators should be tensor-like or scalar-like. We show that the same annihilation effects could remarkably enhance the longitudinal rates of factorization-suppressed B 0 → h 1 (1380)K * 0 , b 1 (1235)K * 0 modes to be (12.0 +4.1 −3.0 ) × 10 −6 and (7.0 ± 3.5) × 10 −6 , respectively, but attend to be cancelled in the transverse components. Nevertheless, the transverse fractions of B → h 1 (1380)K * can become sizable due to new-physics contributions. The measurements of these decays can thus help us to realize the role of annihilation topologies in charmless B decays and offer a theoretically clean window to search for the evidence of new physics.

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Charmless B→VV decays in QCD factorization implications of recent measurement

Cited by 86 publications

References 14 publications

Final state interactions in hadronicBdecays

Final state interactions in hadronicBdecays

Possible large directCPviolations in charmlessBmeson decays: Summary report on the PQCD method

Publisher’s Note: Annihilation in factorization-suppressedBdecays involving a1P11meson and search for new-physics signals [Phys. Rev. D72, 034009 (2005)]

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