Heavy baryon spectroscopy from the lattice

Abstract

The results of an exploratory lattice study of heavy baryon spectroscopy are presented. We have computed the full spectrum of the eight baryons containing a single heavy quark, on a 24 3 × 48 lattice at β = 6.2, using an O(a)-improved fermion action.We discuss the lattice baryon operators and give a method for isolating the contributions of the spin doublets (Σ, Σ * ), (Ξ ′ , Ξ * ) and (Ω, Ω * ) to the correlation function of the relevant operator. We compare our results with the available experimental data and find good agreement in both the charm and the beauty sectors, despite the long extrapolation in the heavy quark mass needed in the latter case. We also predict the masses of several undiscovered baryons. We compute the Λ − pseudoscalar meson and Σ − Λ mass splittings. Our results, which have errors in the range 10 − 30%, are in good agreement with the experimental numbers. For the Σ * − Σ mass splitting, we

Heavy baryon mass spectrum from lattice QCD with 2+1 flavors

“…From experiment, the singly charmed heavy baryon mass spectrum is well known; however, the other heavy baryon masses are only crudely known. From lattice QCD, there are several quenched calculations for the heavy baryon mass spectrum [1][2][3][4][5][6], and most results are in fair agreement with observed values. In this project, we apply lattice QCD with dynamical sea quarks for the same objective.…”

Charmed and bottom baryons: a variational approach based on heavy quark symmetry

“…Errors on the lattice QCD masses have been obtained by adding in quadratures the statistical and systematic errors given in Ref. [12].…”

fB and the heavy-light spectrum from NRQCD

“…4. For the Λ b the quenched lattice calculations using NRQCD [4], tree-level clover [13], and plain Wilson [14] heavy quarks agree within errors with experiment and with each other. The Λ b from Ref.…”

“…This needs further study. [4], diamonds show clover (c SW = 1) heavy quarks [13], and the triangle, Wilson heavy quarks [14]. The square is from a SGO NRQCD calculation with n f = 2 [5].…”