Speaker
Dr
Hiroshi Ohki
(RIKEN BNL Research Center)
Description
We present a novel approach to determining Vus which employs inclusive
strange hadronic tau decay data and hadronic vacuum polarization functions
(HVPs) computed on the lattice. The experimental and lattice data are
related through dispersion relations which employ a class of weight functions
which are products of factors having poles at Euclidean Q^2.
Implementing this approach using lattice data generated by the RBC/UKQCD
collaboration, we show examples of weight functions which allow the
combination of lattice HVPs required for this analysis to be determined
with good accuracy while at the same time strongly suppressing spectral
integral contributions from the region where experimental data either
have large uncertainties or do not exist.
Preliminary results for Vus obtained using this approach will be presented
and shown to be in good agreement with those obtained from analyses of kaon
physics and 3-family CKM unitarity.
Related background, details of the experimental data employed and the
current status of the conventional flavor-breaking sum rule tau V_us puzzle,
as well as an outline of the advantages of the new approach over the
conventional sum rule analysis will be discussed in the talk by Kim Maltman.
Some related studies, involving applications to the running of alpha_QED
and the Weinberg angle, and a possible application to muon g-2 will
also be discussed, as time permits.
Primary author
Dr
Hiroshi Ohki
(RIKEN BNL Research Center)
Co-authors
Dr
Andreas Juettner
(University of Southampton)
Christoph Lehner
(BNL)
Kim Maltman
(York University)
Prof.
Peter Boyle
(University of Edinburgh)
Randy Lewis
(York University)
Renwick Hudspith
(York University)
Taku Izubuchi
(BNL)
