Doubly heavy baryons Omega_QQ' vs. Xi_QQ' in sum rules of NRQCD

Details Doubly heavy baryons Omega_QQ' vs. Xi_QQ' in sum rules of NRQCD Doubly heavy baryons Omega_QQ' vs. Xi_QQ' in sum rules of NRQCD

2000-05-03

arxiv.org/abs/hep-ph/0005019v2

Phys.Rev.D64:014002,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, ReVTeX file, 7 eps-figures, references added

Scientific paper

10.1103/PhysRevD.64.014002

In the framework of two-point sum rules of NRQCD, the masses and couplings of doubly heavy baryons to the corresponding quark currents are evaluated with account of coulomb-like corrections in the system of doubly heavy diquark as well as the contribution of nonperturbative terms determined by the quark, gluon, mixed condensates and the product of gluon and quark condensates. The introduction of nonzero light quark mass destroys the factorization of baryon and diquark correlators even at the perturbative level and provides the better convergency of sum rules. We estimate the difference M_Omega - M_Xi = 100+/- 10 MeV. The ratio of baryonic constants |Z_Omega|^2/|Z_Xi|^2 is equal to 1.3+/-0.2 indicating the violation of SU(3) flavor symmetry for the doubly heavy baryons.

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