Hyperfine mixing and the semileptonic decays of double-heavy baryons in a quark model.

Journal Article · Wed May 20 04:00:00 EDT 2009 · Int. J. Mod. Phys. A

DOI:https://doi.org/10.1142/S0217751X09043407· OSTI ID:960349

Roberts, W; Pervin, M

The semileptonic decays of the lowest-lying double-heavy baryons are treated in a quark model. For the {Xi}{sub bb}, hyperfine mixing in the spin wave function leaves the total rate for decay into the lowest lying daughter baryons essentially unchanged, but changes the relative rates into the {Xi}{sub bc} and {Xi}'{sub bc}. The same pattern is obtained in the decays of the {Omega}{sub bb}. For the {Xi}{sub bc}, this mixing leads to factor of about 17 suppression in the decay rate to the {Xi}*{sub cc} when wave functions truncated to the largest components are used, but the total semileptonic decay rate of the parent baryon remains essentially unchanged. For the {Omega}{sub bc}, the decay to the is suppressed by a factor of more than 25 from the unmixed case. When the full wave functions are used, the large suppression of the decays to the {Xi}*{sub cc} and {Omega}*{sub cc} persists.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 960349
• Report Number(s): ANL/PHY/JA-61392
• Journal Information: Int. J. Mod. Phys. A, Journal Name: Int. J. Mod. Phys. A Journal Issue: 13 ; May 20, 2009 Vol. 24
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
DECAY
QUARK MODEL
SEMILEPTONIC DECAY
SPIN WAVES
WAVE FUNCTIONS