Lattice2010

Session

Parallel 18: Weak decays and matrix elements

15 Jun 2010, 10:30

Villasimius, Sardinia

235. The B*Bpi coupling

Michael Donnellan (NIC, DESY Zeuthen)

15/06/2010, 10:30

Weak decays and matrix elements

We study an efficient method for the lattice calculation of the B*Bpi-coupling in the static limit, a parameter of the heavy meson chiral Lagrangian, paying particular attention to excited state contamination. Precise studies of the continuum limit in the quenched approximation and of the chiral behaviour with 2 flavours of improved Wilson quarks (using CLS lattices) for pion masses down to...

281. Masses and Decay Constants from Relativistic Highly Improved Staggered Quarks in Full Lattice QCD

Eduardo Follana (Universidad de Zaragoza)

15/06/2010, 10:50

Weak decays and matrix elements

I'll give an update on the status of HPQCD's heavy hisq programme. We use a highly improved, relativistic staggered quark action to calculate masses, mass splittings and decay constants for B_s, B_c and heavyonium states.

141. D and B Leptonic Decay Constants from Lattice QCD

James Simone (Fermilab)

15/06/2010, 11:10

Weak decays and matrix elements

We present summary results for the leptonic decay constants $f_{D}$, $f_{D_s}$, $f_B$ and $f_{B_s}$ from the now concluded initial phase of the Fermilab and MILC Collaboration's program in flavor physics. The decay constants are computed on the MILC collaboration's $2+1$ flavor Asqtad gauge ensembles. We use clover heavy quarks in the Fermilab interpretation and Asqtad improved staggered...

316. B meson spectrum and decay constant from Nf=2 simulations

Benoit Blossier (CNRS/LPT Orsay)

15/06/2010, 11:30

Weak decays and matrix elements

We report about a preliminary extraction of masses and decay constants of the lowest pseudoscalar B meson states from lattice simulations with Nf=2 Wilson-Clover dynamical quarks, using a procedure recently presented by the ALPHA Collaboration. The heavy quark is described by Heavy Quark Effective Theory developed up to 1/m_b. Coefficients of the effective theory have been determined non...

288. HQET parameters at the 1/m order with nf=2 flavors of dynamical quarks

Nicolas Garron (University of Edinburgh)

15/06/2010, 11:50

Weak decays and matrix elements

We present our computation of the HQET Lagrangian parameters and those of the time component of the heavy-light axial current, including 1/m corrections. They are obtained by matching non-perturbatively (in a small volume) HQET to QCD, with nf=2 flavors of dynamical quarks, and with quark masses going from the charm to beauty. These parameters can be used to compute the b-quark mass and...

179. The continuum limit of 2+1 flavor DWF ensembles

Christopher Kelly (University of Edinburgh)

15/06/2010, 12:10

Weak decays and matrix elements

We present light pseudoscalar physics in the continuum limit of 2+1 flavour domain wall QCD by the RBC and UKQCD collaborations. We make use of a fermion action with good chiral symmetry and use two different lattice spacings. We use a new approach to match ensembles within the range of simulated masses, and apply a simultaneous chiral and continuum extrapolation. We present...