Revisiting the annihilation decay 
                
                  
                
                $\bar{B}_{s}\to\pi^{ + }\pi^{-}$

Yang, Ya-Dong; Su, Fang; Lu, G. R.; Hao, Hongjun

doi:10.1140/epjc/s2005-02364-0

Cited by 21 publications

(21 citation statements)

References 19 publications

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“…[5][6][7][8] are much smaller than the measured results for BrðB 0 s ! þ À Þ, while smaller or close to the measured ones for BrðB 0 !…”

Section: Introductionmentioning

confidence: 55%

“…And consequently, they are rare decay modes with a branching ratio (Br) at the level of 10 À7 or less as generally expected. Such decays play a very important role in understanding the annihilation mechanism and determining the strength of the annihilation contribution in B meson charmless hadronic decays, and therefore have been studied intensively by many authors [1][2][3][4][5][6][7][8][9][10] in spite of the great difficulties in both the theoretical calculation and the experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

“…In the QCD factorization (QCDF) approach [13], for example, one cannot perform a real calculation for the annihilation diagrams due to the end-point singularity, but has to make a rough estimation by parametrizing the annihilation contribution through the treatment [5,6], or by using an effective gluon propagator 1=k 2 ! 1=ðk 2 þ M 2 g ðk 2 ÞÞ to avoid enhancements in the soft end-point region [7]. Of course, such parametrization will produce large theoretical uncertainties.…”

Section: Introductionmentioning

confidence: 99%

“…K þ K À decays, the theoretical predictions based on the QCDF approach as given, for example, in Refs. [5][6][7][8][9] are the following:…”

Section: Introductionmentioning

confidence: 99%

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Revisiting the pure annihilation decaysBs→π+π−andB0→K+

2012

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In this work, we recalculate the charmless pure annihilation decays B s ! þ À and B 0 ! K þ K À by using the perturbative QCD (pQCD) factorization approach, and compare the pQCD predictions with currently available experimental measurements. By numerical calculations and phenomenological analysis, we found the following results: (a) one can provide a consistent pQCD interpretation for both the measured branching ratio BrðB 0 s ! þ À Þ and BrðB 0 d ! K þ K À Þ simultaneously; (b) the pQCD predictions for BrðB 0 s ! þ À Þ obtained by different authors are well consistent with each other; (c) our new pQCD prediction for BrðB 0 d ! K þ K À Þ agrees well with the measured values from CDF and LHCb Collaborations; and (d) the CP-violating asymmetry A CP ðB 0 d ! K þ K À Þ % 19%, which is large and may be detected at the LHCb and future Super-B factory experiments.

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“…[5][6][7][8] are much smaller than the measured results for BrðB 0 s ! þ À Þ, while smaller or close to the measured ones for BrðB 0 !…”

Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…K þ K À decays, the theoretical predictions based on the QCDF approach as given, for example, in Refs. [5][6][7][8][9] are the following:…”

Section: Introductionmentioning

confidence: 99%

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Revisiting the pure annihilation decaysBs→π+π−andB0→K+

2012

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“…Theoretically, the WA contributions with possible strong phase have attracted a lot of attention in the past few years, for instance, in Refs. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Traditionally, both ρ A and φ A are treated as universal parameters for different kinds of annihilation topologies.…”

Section: Introductionmentioning

confidence: 99%

Study of the weak annihilation contributions in charmless $$\varvec{B_s\rightarrow VV}$$ B s → V V decays

Chang

et al. 2017

Eur. Phys. J. C

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In this paper, in order to probe the spectatorscattering and weak annihilation contributions in charmless B s → V V (where V stands for a light vector meson) decays, we perform the χ 2 -analyses for the endpoint parameters within the QCD factorization framework, under the constraints from the measuredB s → ρ 0 φ, φ K * 0 , φφ and K * 0K * 0 decays. The fitted results indicate that the endpoint parameters in the factorizable and nonfactorizable annihilation topologies are non-universal, which is also favored by the charmless B → P P and PV (where P stands for a light pseudo-scalar meson) decays observed in previous work. Moreover, the abnormal polarization fractions f L ,⊥ (B s → K * 0K * 0 ) = (20.1±7.0)%, (58.4±8.5)% measured by the LHCb collaboration can be reconciled through the weak annihilation corrections. However, the branching ratio ofB s → φ K * 0 decay exhibits a tension between the data and theoretical result, which dominates the contributions to χ 2 min in the fits. Using the fitted endpoint parameters, we update the theoretical results for the charmless B s → V V decays, which will be further tested by the LHCb and Belle-II experiments in the near future.

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QCD Approach to B → D π Decays and CP Violation

Yang

2008

Commun. Theor. Phys.

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The branching ratios and CP violations of the B → Dπ decays, including both the color-allowed and the color-suppressed modes, are investigated in detail within QCD framework by considering all diagrams that lead to three effective currents of two quarks. An intrinsic mass scale as a dynamical gluon mass is introduced to treat the infrared divergence caused by the soft collinear approximation in the endpoint regions, and the Cutkosky rule is adopted to deal with a physical-region singularity of the on mass-shell quark propagators. When the dynamical gluon mass μg is regarded as a universal scale, it is extracted to be around μg = 440 MeV from one of the well-measured B → Dπ decay modes. The resulting predictions for all branching ratios are in agreement with the current experimental measurements. As these decays have no penguin contributions, there are no direct CP asymmetries. Due to interference between the Cabibbo-suppressed and the Cabibbo-favored amplitudes, mixing-induced CP violations are predicted in the B → D±π∓ decays to be consistent with the experimental data at 1-σ level. More precise measurements will be helpful to extracting weak angle 2β + γ.

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Revisiting the annihilation decay $\bar{B}_{s}\to\pi^{ + }\pi^{-}$

Cited by 21 publications

References 19 publications

Revisiting the pure annihilation decaysBs→π+π−andB0→K+

Revisiting the pure annihilation decaysBs→π+π−andB0→K+

Study of the weak annihilation contributions in charmless $$\varvec{B_s\rightarrow VV}$$ B s → V V decays

QCD Approach to B → D π Decays and CP Violation

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