Heavy baryon mixing in chiral perturbation theory

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.5474· OSTI ID:562435

Boyd, C G; Lu, M ^[1]; Savage, M J ^[2]

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1. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
2. Department of Physics, University of Washington, Seattle, Washington 98195 (United States)

We discuss the SU(3) and heavy quark spin-symmetry-breaking mixing between the {Xi}{sub c} and {Xi}{sub c}{sup {prime}} charmed baryons. Chromomagnetic hyperfine interactions are the leading source of spin-symmetry breaking and together with the SU(3)-breaking mass differences between the lightest pseudo Goldstone bosons gives the leading contribution to the mixing. Such contributions are computed in chiral perturbation theory and compared to quark model expectations. We also compute the leading contribution to the semileptonic decay {Xi}{sub b}{r_arrow}{Xi}{sub c}{sup {prime}}l{bar {nu}}{sub l} at zero recoil, and find that it is an order of magnitude smaller than naive power counting would suggest. It appears that {Xi}{sub b}{r_arrow}{Xi}{sub c}{sup {prime}}l{bar {nu}}{sub l} is dominated by incalculable counterterms, and we discuss the implications for quark models based on the essential role of hyperfine interactions. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Carnegie-Mellon University
• DOE Contract Number: FG02-91ER40682
• OSTI ID: 562435
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARM PARTICLES
CHIRAL SYMMETRY
CONFIGURATION MIXING
GOLDSTONE BOSONS
MASS DIFFERENCE
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARK MODEL
QUARKS
SEMILEPTONIC DECAY
SPIN
SU-3 GROUPS
SYMMETRY BREAKING
XI BARYONS
XI C NEUTRAL BARYONS
XI C PLUS BARYONS