25 research outputs found
Some continuum physics results from the lattice V-A correlator
We present preliminary results on extractions of the chiral LECs L_10 and
C_87 and constraints on the excited pseudoscalar state pi(1300) and pi(1800)
decay constants obtained from an analysis of lattice data for the flavor ud
light quark V-A correlator. A comparison of the results for the correlator to
the corresponding mildly-model-dependent continuum results (based primarily on
experimental hadronic tau decay data) is also givenComment: 7 pages, 3 figures. Prepared for the Proceedings of the 30th
International Symposium on Lattice Field Theory, Cairns, Australia, June
24-29, 2012; expanded version of Reference 1
New results from the lattice on the theoretical inputs to the hadronic tau determination of V_us
Recent sum rule determinations of |V_us|, employing flavor-breaking
combinations of hadronic tau decay data, are significantly lower than either
expectations based on 3-family unitarity or determinations from K_ell3 and
Gamma[K_mu2]/Gamma[pi_mu2]. We use lattice data to investigate the
accuracy/reliability of the OPE representation of the flavor-breaking
correlator combination entering the tau decay analyses. The behavior of an
alternate correlator combination, constructed to reduce problems associated
with the slow convergence of the D = 2 OPE series, and entering an alternate
sum rule requiring both electroproduction cross-section and hadronic tau decay
data, is also investigated. Preliminary updates of both analyses, with the
lessons learned from the lattice data in mind, are also presented.Comment: 8 pages, 5 figures. Prepared for the proceedings of the 12th
International Workshop on Tau Lepton Physics, Sep. 17-21, 2012, Nagoya, Japan
and the 10th International Conference on Confinement and the Hadron Spectrum,
Oct. 6-13, 2012, Garching/Munich, German
Some continuum physics results from the lattice V-A correlator
Extent: 7p.We present preliminary results on extractions of the chiral LECs L10 and C87 and constraints on the excited pseudoscalar state (1300) and (1800) decay constants obtained from an analysis of lattice data for the flavor ud light quark V-A correlator. A comparison of the results for the correlator to the corresponding mildly-model-dependent continuum results (based primarily on experimental hadronic decay data) is also given.P.A. Boyle, L. Del Debbio, N. Garron, R.J. Hudspith, E. Kerrane, K. Maltman and J.M. Zanottihttp://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=16