Flavor symmetry analysis of charmless<i>B</i>→<i>VP</i>decays

Chiang, Cheng‐Wei; Zhou, Yu‐Feng

doi:10.1088/1126-6708/2009/03/055

Cited by 23 publications

(14 citation statements)

References 79 publications

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“…The Dalitz plot is dominated by the ρ 0 (770) resonance and a nonresonant contribution which, as seen in other charmless three-body hadronic B decays, is well modeled with an exponential form-factor. The measured branching fraction for the decay B ± → ρ 0 (770)π ± agrees with the world-average value [34] and is consistent with theoretical predictions based on QCD factorization models [44] and SU(3) flavor symmetry [45]. The measured branching fraction of the nonresonant component is consistent with some theoretical predictions [14,16,17].…”

Section: Discussion and Summarysupporting

confidence: 85%

Dalitz plot analysis ofB±→π±π±π∓decays

Aubert¹,

Karyotakis²,

Lees³

et al. 2009

Phys. Rev. D

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We present a Dalitz plot analysis of charmless B ± decays to the final state π ± π ± π ∓ using a sample of (465 ± 5) × 10 6 BB pairs collected by the BABAR experiment at √ s = 10.58 GeV. We measure the branching fractions B(B ± → π ± π ± π ∓ ) = (15.2 ± 0.6 ± 1.2 ± 0.4) × 10 −6 , B(B ± → ρ 0 (770)π ± ) = (8.1 ± 0.7 ± 1.2 +0.4 −1.1 ) × 10 −6 , B(B ± → f2(1270)π ± ) = (1.57 ± 0.42 ± 0.16 +0.53−0.19 ) × 10 −6 , and B(B ± → π ± π ± π ∓ nonresonant) = (5.3 ± 0.7 ± 0.6 +1.1 −0.5 ) × 10 −6 , where the uncertainties are statistical, systematic, and model-dependent, respectively. Measurements of branching fractions for the modes B ± → ρ 0 (1450)π ± and B ± → f0(1370)π ± are also presented. We observe no significant direct CP asymmetries for the above modes, and there is no evidence for the decays B ± → f0(980)π ± , B ± → χc0π ± , or B ± → χc2π ± .PACS numbers: 13.25. Hw, 12.15.Hh, 11.30.Er INTRODUCTIONDecays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings described in the Cabibbo-Kobayashi-Maskawa (CKM) matrix [1,2]. Furthermore, these decays test dynamical models for hadronic B decays.One can measure direct CP asymmetries and constrain magnitudes and phases of the CKM matrix elements using individual channels that appear as intermediate resonances in the B ± → π ± π ± π ∓ decay. For example, the CKM angle γ could be extracted from the interference between the decay B ± → χ c0 π ± , which has no CPviolating phase (in the standard parametrization), and other modes such as B ± → ρ 0 (770)π ± [3,4,5,6,7,8].Studies of B ± → π ± π ± π ∓ can also be useful for a precise measurement of the CKM angle α. A theoretically clean determination of this angle can be obtained from the decay-time dependence of the interference between [11,12]). Charged B decays offer a large statistics sample with which to determine additional resonant or nonresonant contributions to the three-pion Dalitz plot that can affect the measurement of α. For example, the Dalitz plot analysis of B ± → π ± π ± π ∓ allows one to check for effects from B ± → ω(782)π ± , that could cause large direct CP violation due to ρ-ω mixing [13]. It is particularly important to limit the possible effects of broad scalar structures [including the so-called f 0 (600) or σ] and nonresonant contributions [14,15,16,17,18,19].Furthermore, a number of unexplained structures have been observed in charmless B decays to Kππ [20,21,22,23,24,25], KKπ [26,27], and KKK [23,28,29] final states. Verifying the presence of these structures in B± → π ± π ± π ∓ decays would help to determine their nature and involvement in hadronic B decays.In this paper we present an amplitude analysis of GeV. An additional total integrated luminosity of 44 fb −1 was recorded 40 MeV below the Υ (4S) resonance ("off-peak" data) and was used to study backgrounds. Compared to our previous publication [32], in addition to doubling the data sample we have included several improvements in reconstruction algorithms t...

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Section: Discussion and Summarysupporting

confidence: 85%

Dalitz plot analysis ofB±→π±π±π∓decays

Aubert¹,

Karyotakis²,

Lees³

et al. 2009

Phys. Rev. D

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“…That is, we associate a soft factor with M 2 = π, K, but not with M 2 = ρ (the soft effect associated with the kaon is not crucial actually). A global fit to the data of the B → V P decays based on flavor SU (3) symmetry also supported that the color-suppressed tree amplitude is large (small), when M 2 is a pseudoscalar (vector) meson [28]. Because the B 0 → π 0 ρ 0 decay involves both types of amplitudes with the pion and the ρ meson as M 2 , it is natural that the discrepancy is in between as indicated by Eq.…”

Section: Impact On B Meson Decaysmentioning

confidence: 82%

Possible resolution of theB→ππ,πKpuzzles

Mishima

2011

Phys. Rev. D

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We show that there exist uncanceled soft divergences in the kT factorization for nonfactorizable amplitudes of two-body nonleptonic B meson decays, similar to those identified in hadron hadroproduction. These divergences can be grouped into a soft factor using the eikonal approximation, which is then treated as an additional nonperturbative input in the perturbative QCD formalism. Viewing the special role of the pion as a qq bound state and as a pseudo Nambu-Goldstone boson, we postulate that the soft effect associated with it is significant. This soft factor enhances the nonfactorizable color-suppressed tree amplitudes, such that the branching ratios B(π 0 π 0 ) and B(π 0 ρ 0 ) are increased under the constraint of the B(ρ 0 ρ 0 ) data, the difference between the direct CP asymmetries ACP (π ∓ K ± ) and ACP (π 0 K ± ) is enlarged, and the mixing-induced CP asymmetry S π 0 K S is reduced. Namely, the known ππ and πK puzzles can be resolved simultaneously.

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Section: In Comparison Of Eqs (30)−(33) ["Fitting Case"] With Eqs (mentioning

confidence: 94%

“…Likewise, for charmlessB u,d → P V modes, the ratios of the SU(3) F amplitudes extracted from global fits [13] are…”

Section: The Su(3) F -Singlet Contributions S (′)mentioning

confidence: 99%

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Flavor SU(3) symmetry and QCD factorization in B → PP and PV decays

Cheng

2011

J. High Energ. Phys.

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Flavor SU(3) symmetry and QCD factorization in B → P P and P V decays AbstractUsing flavor SU(3) symmetry, we perform a model-independent analysis of charmlessB u,d (B s ) → P P, P V decays. All the relevant topological diagrams, including the presumably subleading diagrams, such as the QCD-and EW-penguin exchange diagrams and flavor-singlet weak annihilation ones, are introduced. Indeed, the QCD-penguin exchange diagram turns out to be important in understanding the data for penguin-dominated decay modes. In this work we make efforts to bridge the (model-independent but less quantitative) topological diagram or flavor SU(3) approach and the (quantitative but somewhat model-dependent) QCD factorization (QCDF) approach in these decays, by explicitly showing how to translate each flavor SU(3) amplitude into the corresponding terms in the QCDF framework. After estimating each flavor SU(3) amplitude numerically using QCDF, we discuss various physical consequences, including SU(3) breaking effects and some useful SU(3) relations among decay amplitudes ofB s → P V andB d → P V . *

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Flavor symmetry analysis of charmlessB→VPdecays

Cited by 23 publications

References 79 publications

Dalitz plot analysis ofB±→π±π±π∓decays

Dalitz plot analysis ofB±→π±π±π∓decays

Possible resolution of theB→ππ,πKpuzzles

Flavor SU(3) symmetry and QCD factorization in B → PP and PV decays

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