The 33rd International Symposium on Lattice Field Theory (Lattice 2015)

Radial distributions of the axial density and the B∗′Bπ coupling

17 Jul 2015, 17:30

20m

406 (Kobe International Conference Center)

Talk Weak Decays and Matrix Elements Weak Decays and Matrix Elements

Speaker

Dr Antoine Gérardin (Laboratoire de Physique Corpusculaire (LPC))

Description

We will present our results for the radial distributions of the axial density in the heavy-light B meson in the static limit of HQET: $⟨B(\overrightarrow{p})|A_{\mu }(\overrightarrow{r})|B^{\ast (\prime )}({\overrightarrow{p}}^{\prime },\lambda )⟩$. Here, $r$ is the distance between the static heavy quark and the insertion of the axial current acting like a probe. Using the Generalized Eigenvalue Problem, we are able to isolate the first radial excitation of the vector $B^{\ast }$ meson and the associated density. After discussing the results, we will show how these distributions allow us to determine the $B^{\ast \prime }B\pi$ coupling at the kinematical point $q^2=0\ne m_{B^{\ast \prime }}-m_B$. The simulations are performed using CLS gauge configurations with Nf=2 non-pertubatively $O(a)$-improved Wilson-Clover fermions and Heavy Quark Effective Theory in the static limit.

Presentation materials

Slides

gerardin.pdf