B−→K−χc0 decay from charmed meson rescattering

K−χc0 decay from charmed meson rescattering

We study the process B− → Kχc0 considering intermediate charmed meson rescattering effects. For this decay mode the naive factorization ansatz would predict a vanishing amplitude. We estimate contributions from the D(∗) s D (∗) → Kχc0 rescattering amplitudes, and compare the result with recent experimental measurements. We find that rescattering effects are able to produce a large branching rat...

Charmed-meson decay constants in three-flavor lattice QCD.

We present the first lattice QCD calculation with realistic sea quark content of the D+-meson decay constant f(D+). We use the MILC Collaboration's publicly available ensembles of lattice gauge fields, which have a quark sea with two flavors (up and down) much lighter than a third (strange). We obtain f(D+)=201+/-3+/-17 MeV, where the errors are statistical and a combination of systematic error...

Charmed Meson Scattering from Lattice QCD

Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks

We compute the leptonic decay constants f D þ , f D s , and f K þ and the quark-mass ratios m c =m s and m s =m l in unquenched lattice QCD using the experimentally determined value of f π þ for normalization. We use the MILC highly improved staggered quark ensembles with four dynamical quark flavors—up, down, strange, and charm—and with both physical and unphysical values of the light sea-quar...

The Charmed Strange Meson System

Motivated by the recent surprising discovery of two new meson states with cs̄ quark content but unexpectedly low masses and narrow total decay widths, we work out, in a nonrelativistic potential-model approach developed already some two decades ago, the predictions for the energy levels of the corresponding charm–anti-strange quark bound states. In spite of the fact that this simple quark model ...