標題: Calculation of the heavy-hadron axial couplings g(1), g(2), and g(3) using lattice QCD
作者: Detmold, William
Lin, C. -J. David
Meinel, Stefan
物理研究所
Institute of Physics
公開日期: 18-六月-2012
摘要: 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.
URI: http://dx.doi.org/114508
http://hdl.handle.net/11536/16477
ISSN: 1550-7998
DOI: 114508
期刊: PHYSICAL REVIEW D
Volume: 85
Issue: 11
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