9,115 research outputs found
Renormalization Constants using Quark States in Fixed Gauge
We present a status report on our calculation of the renormalization
constants for the quark bilinears in quenched (O(a)) improved Wilson theory at
(beta=6.4) using quark states in Landau gauge.Comment: 4 pages. Contribution to LATTICE00(Improvement), August, 2000,
Bangalore Indi
Computing the Slope of the Isgur-Wise Function
We propose a method for evaluating the slope (and higher derivatives) of the
Isgur-Wise function at the zero recoil point using lattice simulations. These
derivatives are required for the extrapolation of the experimental data for
decays to the zero recoil point, from which the
element of the CKM-matrix can be determined.Comment: Latex File Southampton Preprint 93/94-07; Rome Preprint 93/98
Effects of finite volume on the KL-KS mass difference
Phenomena that involve two or more on-shell particles are particularly sensitive to the effects of finite volume and require special treatment when computed using lattice QCD. In this paper we generalize the results of LĂŒscher and Lellouch and LĂŒscher, which determine the leading-order effects of finite volume on the two-particle spectrum and two-particle decay amplitudes to determine the finite-volume effects in the second-order mixing of the K0 and K0ÂŻ states. We extend the methods of Kim, Sachrajda, and Sharpe to provide a direct, uniform treatment of these three, related, finite-volume corrections. In particular, the leading, finite-volume corrections to the KL-KS mass difference ÎMK and the CP-violating parameter ΔK are determined, including the potentially large effects which can arise from the near degeneracy of the kaon mass and the energy of a finite-volume, two-pion state
Direct Production of Tripartite Pump-Signal-Idler Entanglement in the Above-Threshold Optical Parametric Oscillator
We calculate the quantum correlations existing among the three output fields
(pump, signal, and idler) of a triply resonant non-degenerate Optical
Parametric Oscillator operating above threshold. By applying the standard
criteria [P. van Loock and A. Furusawa, Phys. Rev. A 67, 052315 (2003)], we
show that strong tripartite continuous-variable entanglement is present in this
well-known and simple system. Furthermore, since the entanglement is generated
directly from a nonlinear process, the three entangled fields can have very
different frequencies, opening the way for multicolored quantum information
networks.Comment: 4 pages, 3 figure
Non-Perturbative Renormalisation of the Lattice Four-Fermion Operator
We compute the renormalised four-fermion operator using a
non-perturbative method recently introduced for determining the renormalisation
constants of generic lattice composite operators. Because of the presence of
the Wilson term, mixes with operators of different
chiralities. A projection method to determine the mixing coefficients is
implemented. The numerical results for the renormalisation constants have been
obtained from a simulation performed using the SW-Clover quark action, on a
lattice, at . We show that the use of the constants
determined non-perturbatively improves the chiral behaviour of the lattice kaon
matrix element \_{\latt}.Comment: LaTeX, 16 pages, 2 postscript figure
Electromagnetic corrections to leptonic decay rates of charged pseudoscalar mesons: finite-volume effects
In Carrasco et al. we have recently proposed a method to calculate
electromagnetic corrections to leptonic decay widths of pseudoscalar mesons.
The method is based on the observation that the infrared divergent
contributions (that appear at intermediate stages of the calculation and that
cancel in physical quantities thanks to the Bloch-Nordsieck mechanism) are
universal, i.e. depend on the charge and the mass of the meson but not on its
internal structure. In this talk we perform a detailed analysis of the
finite-volume effects associated with our method. In particular we show that
also the leading finite-volume effects are universal and perform an
analytical calculation of the finite-volume leptonic decay rate for a
point-like meson
Finite-Volume QED Corrections to Decay Amplitudes in Lattice QCD
We demonstrate that the leading and next-to-leading finite-volume effects in
the evaluation of leptonic decay widths of pseudoscalar mesons at
are universal, i.e. they are independent of the structure of the meson. This is
analogous to a similar result for the spectrum but with some fundamental
differences, most notably the presence of infrared divergences in decay
amplitudes. The leading non-universal, structure-dependent terms are of
(compared to the leading non-universal corrections in the
spectrum). We calculate the universal finite-volume effects, which requires an
extension of previously developed techniques to include a dependence on an
external three-momentum (in our case, the momentum of the final state lepton).
The result can be included in the strategy proposed in
Ref.\,\cite{Carrasco:2015xwa} for using lattice simulations to compute the
decay widths at , with the remaining finite-volume effects starting
at order . The methods developed in this paper can be generalised to
other decay processes, most notably to semileptonic decays, and hence open the
possibility of a new era in precision flavour physics
- âŠ