6533b82dfe1ef96bd1292021

RESEARCH PRODUCT

Distribution Amplitudes of Heavy-Light Mesons

Daniele BinosiCraig D. RobertsMinghui DingMinghui DingMinghui DingJoannis PapavassiliouLei ChangFei Gao

subject

Nuclear and High Energy PhysicsParticle physicsMesonNuclear TheoryAstrophysics::High Energy Astrophysical PhenomenaInverseFOS: Physical sciencesHeavy-light mesons01 natural sciencesParton distribution amplitudesNuclear Theory (nucl-th)High Energy Physics - Phenomenology (hep-ph)High Energy Physics - Lattice0103 physical sciencesBound stateNonperturbative continuum methods in quantum field theoryEffective field theoryQuantum field theory010306 general physicsNuclear ExperimentQuantum chromodynamicsPhysics010308 nuclear & particles physicsBranching fractionHigh Energy Physics - Lattice (hep-lat)High Energy Physics::PhenomenologyB-meson decayslcsh:QC1-999High Energy Physics - PhenomenologyAmplitudeHigh Energy Physics::Experimentlcsh:PhysicsQuantum chromodynamics

description

A symmetry-preserving approach to the continuum bound-state problem in quantum field theory is used to calculate the masses, leptonic decay constants and light-front distribution amplitudes of empirically accessible heavy-light mesons. The inverse moment of the $B$-meson distribution is particularly important in treatments of exclusive $B$-decays using effective field theory and the factorisation formalism; and its value is therefore computed: $\lambda_B(\zeta = 2\,{\rm GeV}) = 0.54(3)\,$GeV. As an example and in anticipation of precision measurements at new-generation $B$-factories, the branching fraction for the rare $B\to \gamma(E_\gamma) \ell \nu_\ell$ radiative decay is also calculated, retaining $1/m_B^2$ and $1/E_\gamma^2$ corrections to the differential decay width, with the result $\Gamma_{B\to \gamma \ell \nu_\ell}/\Gamma_B = 0.47(15)$ on $E_\gamma > 1.5\,$GeV.

yearjournalcountryeditionlanguage
2019-03-01
http://arxiv.org/abs/1812.05112