Speaker
Pere Masjuan Queralt
Description
We employ a mathematical framework based on rational approximants
in order to calculate meson form factors. The method profits
from unitary, is systematic and data based, and is able to ascribe a
systematic uncertainty which provides for the desired model independence.
Two examples are discussed: the pseudoscalar-pole piece of the
hadronic light-by-light contribution to the anomalous magnetic moment
of the muon, and the B → πν and B− → η
(0)
−ν differential
branching ratios which allows to determine both the |Vub| and the η-η
0
mixing.
