Constraining weak annihilation using semileptonic D decays

Abstract

The recently measured semileptonic D_s decay rate can be used to constrain weak annihilation (WA) effects in semileptonic D and B decays. We revisit the theoretical predictions for inclusive semileptonic D_{(s)} decays using a variety of quark mass schemes. The most reliable results are obtained if the fits to B decay distributions are used to eliminate the charm quark mass dependence, without using any specific charm mass scheme. Our fit to the available data shows that WA is smaller than commonly assumed. There is no indication that the WA octet contribution (which is better constrained than the singlet contribution) dominates. The results constrain an important source of uncertainty in the extraction of |Vub| from inclusive semileptonic B decays.

5 pages, 2 figures, published version

References in corpus (5)

• Lattice QCD inputs to the CKM unitarity triangle analysis
• Precise predictions for B -> Xs l+ l- in the large q^2 region
• Measurement of absolute branching fractions of inclusive semileptonic decays of charm and charmed-strange mesons
• Reparametrization Invariance Constraints on Inclusive Decay Spectra and Masses
• On the matrix elements of dB=0 operators in the heavy meson decay widths

Cited by in corpus (14)

• QCD and strongly coupled gauge theories: challenges and perspectives
• The Physics of the B Factories
• 50 Years of Quantum Chromodynamics
• Challenges in Semileptonic B Decays
• Study of Bbar --> Xu l nubar decays in BBbar events tagged by a fully reconstructed B-meson decay and determination of |V_{ub}|
• Measurements of Partial Branching Fractions of Inclusive $B\to X_u{\ell }^{+}{\nu }_{\ell }$ Decays with Hadronic Tagging
• Ratios of heavy hadron semileptonic decay rates
• The Heavy Quark Expansion for Inclusive Semileptonic Charm Decays Revisited
• NNVub: a Neural Network Approach to $B\to X_u\ell \nu$
• Measurement of the absolute branching fraction of inclusive semielectronic $D_s^{+}$ decays
• Semileptonic and leptonic $B$ decays, circa 2016
• Charming Darwin: the evolution of QCD parameters across different species
• Measurement of the Ratio of Partial Branching Fractions of Inclusive $\overline{B}\to X_u\ell \overline{\nu }$ to $\overline{B}\to X_c\ell \overline{\nu }$ and the Ratio of their Spectra with Hadronic Tagging
• Study of $B^{+}\to {\mu }^{+}{\nu }_{\mu }$ decays at Belle and Belle II