Hyperfine Interactions in Charm and Bottom Systems

Abstract

Hyperfine interactions in the light meson and baryon sectors are generalized to the charm and bottom systems. It is pointed out that an attempt to increase the value of the wave function at the origin to account for the unusual ratio of ${\Lambda }_b$ to the $B^0$ lifetimes could spoil the good agreement among the baryon and meson hyperfine mass-splitting. Including spin effects and taking phase space differences into account we predict that the decay rate of the ${\Lambda }_b$ can be increased relative to that of the $B^0$ meson by about 7%.

10 pages, plain Latex, no figures. A new isospin argument has been added

Cited by in corpus (7)

• Charmed and Bottom Baryons from Lattice NRQCD
• Charmed baryons in lattice QCD
• Electromagnetic Transitions of Heavy Baryons in the SU(2N_{f}) X O(3) Symmetry
• Four-quark Operators Relevant to B Meson Lifetimes from QCD Sum Rules
• Nonspectator Effects and B Meson Lifetimes from a Field-theoretic Calculation
• Reanalysis of the Four-Quark Operators Relevant to Λ_b Lifetime from QCD Sum Rule
• Implications of Isospin Conservation in ${\Lambda }_b$ Decays and Lifetime