7 research outputs found
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The gluon propagator in momentum space
We consider quenched QCD on a 16[sup 3][times]40 lattice at [beta]=6.0. We give preliminary numerical results for the lattice gluon propagator evaluated both in coordinate and momentum space. Our findings are compared with earlier results in the literature at zero momentum. In addition, by considering nonzero momenta we attempt to extract the form of the propagator and compare it to continuum predictions formulated by Gribov and others
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CP violating effective gluon-top quark couplings
The general form of CP-violating effective couplings between the gluon and top quark is considered. Those operators which are relevant to top production at hadron super colliders through gg [yields] t[anti t] are categorized. In this way the limits which may be placed on the scale of new CP-violating physics at the SSC are considered. The Weinberg 3 Higgs doublet model is considered as an illustration of the utility of this approach
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Flavor changing neutral current transitions on the lattice for heavy-light systems
Flavor changing neutral current transitions are a very important test of the standard model. Some of the channels can also be very useful for extracting the Kobayashi-Maskawa mixing matrix elements. However, their potential applications are limited by the uncertainties in the relevant hadronic matrix elements. We show that these matrix elements are also amenable to lattice techniques. In this study, we focus on radiative transitions such as B {yields} K*{gamma} and present preliminary results obtained by using 24{sup 3} {times} 40 lattices at {Beta} = 6.0
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Introduction to lattice gaugefixing and effective quark and gluon masses
We report on the status of quark and gluon propagators in quenched, gaugefixed lattice QCD. In Landau gauge we find that the effective quark mass in the chiral limit is M[sub q] [approximately] 350(40)MeV. Quark and gluon propagators, the slope of the quark dispersion relation, and effective masses all appear to depend on gauge. A link-chain picture of lattice gaugefixing in the color N [yields] [infinity] and strong coupling limit, where the system becomes almost solvable, supports the gauge variance of these numerical results
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Decay constants of heavy-light pseudoscalars: Results at. beta. = 6. 3
A lattice calculation of the pseudoscalar decay constant for heavy-light mesons is reported. Emphasis is placed on preliminary results obtained using wall-source propagators at {beta} = 6.3. The previously-observed discrepancy between the static and conventional approaches appears to be much reduced
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Calculating the Isgur-Wise function on the lattice
We calculate the Isgur-Wise function by measuring the heavy-heavy meson transition matrix element on the lattice. The standard Wilson action is used for both the heavy and light quarks. Our first numerical results are presented
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Probing the flavor changing vertex of the top-quark
The implications of the flavor changing neutral current vertex, t {yields} cX, where X = {gamma},g, Z, or H is examined in the Standard and two-Higgs-doublet models. 9 refs., 3 figs