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Keum, Yong-Yeon; Kurimoto, Takeshi; Li, Hsiang-nan; Lu, C.; Sanda, A. I.

doi:10.1103/physrevd.69.094018

Cited by 109 publications

(119 citation statements)

References 79 publications

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“…In the B → Dπ decays, there is no soft cancellation between a pair of nonfactorizable diagrams, and nonfactorizable contributions are significant [23,25]. In QCDF the factorizable and nonfactorizable amplitudes are of the same power in 1/m b , but the latter is of next-to-leading order in α s compared to the former.…”

Section: Power Counting Rule In Pqcdmentioning

confidence: 97%

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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Section: Power Counting Rule In Pqcdmentioning

confidence: 97%

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

Keum

Sanda

2003

Phys. Rev. D

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“…An early effort along this direction is based on a quasi-elastic scattering model [57]. For a recent study of the color-suppressed B → D ( * )0 M decays in the perturbative QCD approach based on k T factorization theorem and in soft-collinear effective theory, see [58] and [59] respectively. Given the weak Hamiltonian in the form H W = i λ i Q i , where λ i is the combination of the quark mixing matrix elements and Q i is a T -even local operator (T : time reversal), the absorptive part of Fig.…”

Section: B → Dπ Decaysmentioning

confidence: 99%

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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“…[33,34], and the wave function of the pseudoscalar meson η c ð2SÞ gets the same access to η c ð1SÞ [30].…”

Section: Theoretical Frame and The Wave Functionmentioning

confidence: 93%

Study ofBc→ψ(2S)K,η
Duan
¹
,
Yu
²

2018
Phys. Rev. D
3
0
7
0
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We study the B c → ψð2SÞ K, η c ð2SÞ K, ψð3770Þ K decays with perturbative QCD approach based on k T factorization. The new orbitally excited charmonium distribution amplitudes ψð1 3 D 1 Þ based on the Schrödinger wave function of the n ¼ 1, l ¼ 2 state for the harmonic-oscillator potential are employed. By using the corresponding distribution amplitudes, we calculate the branching ratio of B c → ψð2SÞ K, η c ð2SÞ K, ψð3770Þ K decays and the form factors A 0;1;2 and V for the transition B c → ψð1 3 D 1 Þ. We obtain the branching ratio of both B c → ψð2SÞ K and B c → η c ð2SÞ K are at the order of 10 −5 . The effects of two sets of the S-D mixing angle θ ¼ −12°and θ ¼ 27°for the decay B c → ψð3770Þ K are studied first in this paper. Our calculations show that the branching ratio of the decay B c → ψð3770Þ K can be raised from the order of 10 −6 to the order of 10 −5 at the mixing angle θ ¼ −12°, which can be tested by the running LHC-b experiments.

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Nonfactorizable contributions toB→D(*)Mdecays

Cited by 109 publications

References 79 publications

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

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

Final state interactions in hadronicBdecays

Study ofBc→ψ(2S)K,η
Duan
¹
,
Yu
²

2018
Phys. Rev. D
3
0
7
0
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Nonfactorizable contributions toB→D(*)Mdecays

Cited by 109 publications

References 79 publications

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

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

Final state interactions in hadronicBdecays

Study ofBc→ψ(2S)K,ηDuan1, Yu2 2018Phys. Rev. D3070View full textAdd to dashboardCite

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Study ofBc→ψ(2S)K,η
Duan
¹
,
Yu
²

2018
Phys. Rev. D
3
0
7
0
View full text Add to dashboard Cite