Chen<i>et al.</i> Reply:

Chen, Chin-Der; Kuo, Wu‐Hsien; Chung, Duck-Young; Shyu, J. H.; Wu, Chi‐Shin

doi:10.1103/physrevlett.91.149702

Cited by 101 publications

(146 citation statements)

References 6 publications

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“…The measured longitudinal fractions for B → φK * by both BaBar [24] and Belle [25] are close to 50%. This is in sharp contrast to the general argument that factorizable amplitudes in B decays to light vector meson pairs give a longitudinal polarization satisfying the scaling law:…”

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confidence: 73%

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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confidence: 73%

Final state interactions in hadronicBdecays

2005

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“…Combined with helicity conservation in strong interactions and spin-flip suppression of relativistic decay products, this leads to certain expectations of the spin alignment in weak B meson decays to light particles with spin, such as ( ) B → ϕ ( ) K * [13]. However, the large fraction of transverse polarization in the ( ) B → ϕ ( ) K * (892) decay measured by BABAR [14] and by Belle [15] indicates a significant departure from the naive expectation of predominant longitudinal polarization. This suggests the presence of other contributions to the decay amplitude, previously neglected, either within or beyond the Standard Model [16].…”

Section: Introductionmentioning

confidence: 99%

Time-dependent and time-integrated angular analysis ofB→φKS0π0andφK±π

Aubert¹,

Bóna²,

Karyotakis³

et al. 2008

Phys. Rev. D

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We perform a time-dependent and time-integrated angular analysis of the decays B 0 → ϕK * (892) 0 , ϕK * 2 (1430) 0 , and ϕ(Kπ) * 0 0 with the final sample of about 465 million BB pairs recorded with the BABAR detector. Twenty-four parameters are investigated, including the branching fractions, CP -violation parameters, and parameters sensitive to final-state interactions. We use the dependence on the Kπ invariant mass of the interference between the scalar and vector or tensor components to resolve discrete ambiguities of the strong and weak phases. We use the time-evolution of the B → ϕK 0 S π 0 channel to extract the CP -violation phase difference ∆φ00 = 0.28 ± 0.42 ± 0.04 between the B and B decay amplitudes. When the B → ϕK ± π ∓ channel is included, the fractions of longitudinal polarization fL of the vector-vector and vector-tensor decay modes are measured to be 0.494 ± 0.034 ± 0.013 and 0.901 +0.046 −0.058 ± 0.037, respectively. This polarization pattern requires the presence of a positive-helicity amplitude in the vector-vector decay from a currently unknown source.6

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“…The BaBar and Belle collaborations have recently measured B → φK * decays with large transverse fractions [1,2,3,4,5] which are suppressed by (1/m b ) 2 in the Standard Model (SM) perturbative picture. Within the SM, it has been given in Ref.…”

Section: Introductionmentioning

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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Chenet al. Reply:

Cited by 101 publications

References 6 publications

Final state interactions in hadronicBdecays

Final state interactions in hadronicBdecays

Time-dependent and time-integrated angular analysis ofB→φKS0π0andφK±π

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

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