Abstract
We present new lattice results of the semileptonic form factors obtained from simulations with two flavors of dynamical twisted-mass fermions, using pion masses as light as 260 MeV. Our main result is , which, combined with the latest experimental data for decays, leads to . Using the PDG(2008) determinations of and our result implies for the unitarity relation . For the term of the chiral expansion of we get .
- Received 6 July 2009
DOI:https://doi.org/10.1103/PhysRevD.80.111502
©2009 American Physical Society