Document Type
Article
Department/Program
Physics
Journal Title
Physical Review D
Pub Date
2012
Volume
85
Issue
11
Abstract
In a recent letter [Phys. Rev. Lett. 108, 172003 (2012)] we have reported on a lattice QCD calculation of the heavy-hadron axial couplings g(1), g(2), and g(3). These quantities are low-energy constants of heavy-hadron chiral perturbation theory (HH chi PT) and are related to the B*B pi, Sigma(b)*Sigma(b)pi, and Sigma(b)(*)Lambda(b)pi couplings. In the following, we discuss important details of the calculation and give further results. To determine the axial couplings, we explicitly match the matrix elements of the axial current in QCD with the corresponding matrix elements in HH chi PT. We construct the ratios of correlation functions used to calculate the matrix elements in lattice QCD, and study the contributions from excited states. We present the complete numerical results and discuss the data analysis in depth. In particular, we demonstrate the convergence of SU(4 vertical bar 2) HH chi PT for the axial-current matrix elements at pion masses up to about 400 MeV and show the impact of the nonanalytic loop contributions. Finally, we present additional predictions for strong and radiative decay widths of charm and bottom baryons.
Recommended Citation
Detmold, William; Meinel, Stefan; Detmold, William; Lin, C. -J. David; and Lin, C. -J. David, Calculation of the heavy-hadron axial couplings g(1), g(2), and g(3) using lattice QCD (2012). Physical Review D, 85(11).
10.1103/PhysRevD.85.114508
DOI
10.1103/PhysRevD.85.114508
