B -> eta^(\prime) l nu decays and the flavor-singlet form factor

Abstract

We study semileptonic decays B -> eta^(\prime) l nu, taking into account the flavor-singlet contribution (F^{singlet}_+) to the B -> eta^(\prime) form factors, which arises from the two-gluon emission in a decaying B meson. It has been recently pointed out that, in addition to large weak annihilation effects, the unknown value of F^{singlet}_+ prevents accurate theoretical estimates in the analysis of B -> eta^\prime K decays in QCD factorization. We present a certain method to determine F^{singlet}_+ with a reasonable accuracy, using B -> eta^(\prime) l nu and B -> pi l nu decays. We also investigate the possible effect of F^{singlet}_+ on the estimated branching ratios (BRs) for B -> eta^(\prime) l nu and find that the BR for B -> eta^\prime l nu is particularly sensitive to the effect of F^{singlet}_+.

arXiv comment16 pages, 6 eps figures, the title changed, comments on new observables added, a final version to appear in Phys. Lett. B

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Cited by in corpus (14)

• Composition of the Pseudoscalar Eta and Eta' Mesons
• B->eta(') Form Factors in QCD
• Gluonic contribution to $B\to {\eta }^{(\prime )}$ form factors
• A Study of Exclusive Charmless Semileptonic B Decay and |V_ub|
• Semileptonic decays $B/B_s \to (η,\etar, G)(l^+l^-,l\barν,ν\barν)$ in the perturbative QCD approach beyond the leading order
• $B\to {\eta }^{(\prime )}({\ell }^{-}{\bar{\nu }}_{\ell },{\ell }^{+}{\ell }^{-},K,K^{\ast })$ decays in the quark-flavor mixing scheme
• Measurements of B --> {pi, eta, eta'} l nu Branching Fractions and Determination of |Vub| with Semileptonically Tagged B Mesons
• A Study of Exclusive Charmless Semileptonic B Decays and Extraction of |V_{ub}| at CLEO
• An Analysis of $B\to {\eta }^{\prime }K$ Decays Using a Global Fit in QCD Factorization
• ${\eta }^{(\prime )}$ productions in semileptonic B decays
• Heavy Baryonic Decays of Λ_b \to Λη^{(\prime)} and Nonspectator Contribution
• Semileptonic $B-\to p\bar{p}\ell -{\bar{\nu }}_{\ell }$ decays
• Measurement of the Decays $\mathbf{B}\to \mathbf{\eta }\mathbf{\ell }{\mathbf{\nu }}_{\mathbf{\ell }}$ and $\mathbf{B}\to {\mathbf{\eta }}^{\prime }\mathbf{\ell }{\mathbf{\nu }}_{\mathbf{\ell }}$ in Fully Reconstructed Events at Belle
• Model independent investigation of rare semileptonic b \to u l \barν_l decay processes