منابع مشابه
Doubly Charmful Baryonic B Decays
There are two apparent puzzles connected with the two-body and three-body doubly charmed baryonic B decays. First, earlier calculations based on QCD sum rules or the diquark model predict B(B → Ξc Λ̄−c ) ≈ B(B 0 → BcN), while experimentally the former has a rate two orders of magnitude larger than the latter. Second, a naive estimate of the branching ratio O(10−9) for the color-suppressed three-...
متن کاملDoubly Heavy Systems: Decays and Ope
We discuss questions related to the application of OPE for the long-lived systems with two heavy flavors. The values of quark masses entering such calulations are constrained by use of currently available data on the lifetimes of B d and B c-mesons. The lifetimes of doubly charmed baryons at these values of parameters are evaluated. The necessary comments on the difference in the results obtain...
متن کاملNovel Weak Decays in Doubly Strange Systems
The strangeness-changing (∆S = 1) weak baryon-baryon interaction is studied through the nonmesonic weak decay of double-Λ hypernuclei. Besides the usual nucleon-induced decay ΛN → NN we discuss novel hyperon-induced decay modes ΛΛ → ΛN and ΛΛ → ΣN . These reactions provide unique access to the exotic ΛΛK and ΛΣK vertices which place new constraints on Chiral Pertubation Theory (χPT) in the weak...
متن کاملBeta and gamma decays
1 Simple Fermi theory of beta decay 2 Beta decay is one of the most easily found kinds of radioactivity. As we have seen, this result of the weak interaction leads to conversion of a neutron into a proton or vice versa, with the necessary charge change being made possible by the emission of a positive or negative beta particle (positron or electron). To ensure conservation of lepton number, eac...
متن کاملDoubly Charged Higgsino Pair Production and Decays in ee Collisions
In supersymmetric grand unified theories, light higgsino multiplets generally exist in addition to the familiar chargino/neutralino multiplets of the minimal supersymmetric extension of the Standard Model. The new multiplets may include doubly charged states ∆̃ and δ̃. We study the properties and the production channels of these novel higgsinos in ee and γγ collisions, and investigate how their p...
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ژورنال
عنوان ژورنال: Nature
سال: 1997
ISSN: 0028-0836,1476-4687
DOI: 10.1038/36455