D ec 1 99 9 Lattice QCD , O . P . E . and the Standard Model G . C . Rossi
نویسنده
چکیده
A number of old and new methods for computing K → ππ amplitudes on the lattice are reevaluated. They all involve a non-perturbative determination of matching coefficients. I will show how problems related to operator mixing can be greatly reduced by introducing the O.P.E. of hadronic currents directly on the lattice. Applications to the evaluation of CP-symmetric (∆I = 1/2 rule) and CP-violating (ǫ ′ /ǫ) processes are presented.
منابع مشابه
ar X iv : h ep - l at / 0 51 20 11 v 1 9 D ec 2 00 5 Nucleon structure from generalized parton distributions in lattice QCD ∗ †
This talk presents results from the QCDSF-UKQCD collaboration for moments of leading twist generalized parton distributions in two-flavor lattice QCD based on O(a) improved Wilson Fermions. We study helicity independent and helicity flip GPDs with a focus on densities of quarks in the transverse plane.
متن کاملar X iv : h ep - l at / 9 71 20 04 v 1 2 D ec 1 99 7 1505 : Update on lattice QCD with domain wall quarks
Using domain wall fermions, we estimate BK(μ ≈ 2GeV) = 0.602(38) in quenched QCD which is consistent with previous calculations. We also find ratios of decay constants that are consistent with experiment, within our statistical errors. Our initial results indicate good scaling behavior and support expectations that O(a) errors are exponentially suppressed in low energy (E ≪ a) observables. It i...
متن کاملar X iv : h ep - p h / 99 12 34 7 v 1 1 5 D ec 1 99 9 1 Quark Confinement Physics in Quantum Chromodynamics
We study abelian dominance and monopole condensation for the quark confinement physics using the lattice QCD simulations in the MA gauge. These phenomena are closely related to the dual superconductor picture of the QCD vacuum, and enable us to construct the dual Ginzburg-Landau (DGL) theory as an useful effective theory of nonperturbative QCD. We then apply the DGL theory to the studies of the...
متن کاملar X iv : h ep - l at / 9 71 20 23 v 1 1 9 D ec 1 99 7 Submitted to Phys . Rev . Lett . Temperature dependence of instantons in QCD
We investigate the temperature dependence of the instanton contents of gluon fields, using unquenched lattice QCD and the cooling method. The instanton size parameter deduced from the correlation function decreases from 0.44fm below the phase-transition temperature T c (≈ 150MeV) to 0.33fm at 1.3 T c. The instanton charge distribution is Poissonian above T c , but it deviates from the convolute...
متن کاملar X iv : h ep - l at / 9 91 00 20 v 1 8 O ct 1 99 9 1 An Investigation of the Soft Pion Relation in Quenched Lattice QCD
A lattice determination of the form factor and decay constants for the semileptonic decay of heavy pseudoscalar (PS) mesons at zero recoil is presented from which the soft pion relation is satisfied. Chiral extrapolation of the form factor is performed at constant q 2. Pole dominance is used to extrapolate the form factor in heavy quark mass. At the B mass, the form factor at zero recoil lies s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008