Heavy Baryons from Lattice NRQCD
نویسندگان
چکیده
Extraction of correct mass splittings between vector and pseudoscalar mesons remains a challenging problem in lattice QCD. While quenched lattice QCD has been unable to extract correct mass splittings [1], so far this problem persists even with full lattice QCD [2]. One may thus ask whether lattice results for baryon mass splittings exhibit similar suppression compared to experimental numbers. So far, only a few lattice QCD results have been reported for heavy baryons [3– 7], and there are only two works [3,4] where heavy quarks are treated nonrelativistically. In this work we report heavy baryon results by using a nonrelativistic heavy quark action and an improved light quark action on anisotropic lattices.
منابع مشابه
The Mass Spectrum of Light and Heavy Hadrons from Improved Lattice Actions
We use improved lattice actions for glue, light quarks and heavy quarks for which we use lattice NRQCD to compute hadron masses. Our results are in good agreement with experiment, except for charmed hadrons. It seems that charmed quarks are not well approximated as heavy quarks nor as light quarks.
متن کاملHeavy Quark – Light Diquark Approach to a Heavy Baryon in the Heavy Quark Symmetry Limit
. Abstract— The masses and distance configurations of the ground and excited states of heavy – charmed and bottom baryons J =1/2 ,3/2,containing a single heavy quark and a light diquark are studied within HQS limit of the HQLD sector of NRQCD framework. We find how the average distances between the heavy quark and the center of mass of the light diquark are smaller than the size of the light di...
متن کاملHeavy-light Mesons and Baryons with b quarks
We present lattice results for the spectrum of mesons containing one heavy quark and of baryons containing one or two heavy quarks. The calculation is done in the quenched approximation using the NRQCD formalism for the heavy quark. We analyze the dependence of the mass splittings on both the heavy and the light quark masses. Meson P -state fine structure and baryon hyperfine splittings are res...
متن کاملar X iv : h ep - p h / 98 10 28 3 v 1 8 O ct 1 99 8 Two - loop anomalous dimensions for currents of baryons with twoheavy quarks in NRQCD
Two-loop anomalous dimensions for currents of baryons with two heavy quarks in NRQCD. Abstract We present analytical results on the two-loop anomalous dimensions of currents for baryons, containing two heavy quarks J = [Q iT CΓτ Q j ]Γ ′ q k ε ijk with arbitrary Dirac matrices Γ and Γ ′ in the framework of NRQCD in the leading order over both the relative velocity of heavy quarks and the invers...
متن کاملSpectroscopy of Hadrons with b Quarks from Lattice NRQCD
Experimental data on excited B mesons and b baryons have begun to emerge just recently. One hopes that in the next years, these states will be firmly established and accurate data on their masses become available. For the Bc, experimental results are so far restricted to preliminary values for the ground state mass. It is therefore of great interest to obtain predictions for the B and Bc spectr...
متن کامل