期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP03(2016)028
关键词
Heavy Quark Physics; Chiral Lagrangians
资金
- Ministry of Science and Technology of R.O.C. [104-2112-M-001-022, 104-2112-M-009-021]
More than two decades ago, we studied heavy-flavor-conserving weak decays of heavy baryons within the framework that incorporates both heavy-quark and chiral symmetries. In view of the first observation of Xi(-)(b) -> Lambda(0)(b)pi(-) by LHCb recently, we have reexamin Xi(-)(b) -> Lambda(0)(b)pi(-) in the MIT bag and diquark models are consistent with experiment. The major theoretical uncertainty stems from the evaluation of baryon matrix elements. The branching fraction of Xi(c)-> Lambda(c)pi is predicted to be of order 10(-4). It is suppressed relative to B(Xi(b) -> Lambda(b)pi) owing to the shorter lifetime of Xi(c) relative to Xi(b) and the destructive nonspectator W-exchange contribution. The kinematically accessible weak decays of the sextet heavy baryon Omega(Q) are Omega(Q) -> Xi(Q)pi. Due to the absence of the B-6 - B-(3) over bar transition in the heavy quark limit and the B-6 - B-6 transition in the model calculations, Omega(Q) -> Xi(Q)pi vanish in the heavy quark limit.
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