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Radiative Decays of Excited Λ Q Baryons in the Bound State Picture
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chow, Connie |
| Copyright Year | 2008 |
| Abstract | It is shown that, in the bound state picture, the Λc(2593) → Λcγ and Λc(2625) → Λcγ decays are severely suppressed. On the other hand, for their bottom counterparts, which are predicted to have masses 5900 and 5926 MeV respectively, may have significant radiative branching ratio. In particular, the Λb(5926) → Λbγ mode may even dominate over the strong decay mode. The isospin allowed Λ Q → ΣQγ mode is expected to be small. Typeset using REVTEX 1 In Ref. [1–4], the bound state picture of heavy baryons was developed. This model is motivated by the large Nc limit, in which the ground state light baryons (nucleon N and Delta ∆) just appear as topological solitons of the Goldstone fields. As a result, the interactions of light baryons and heavy mesons can be studied under chiral perturbation theory. It turns out that, under chiral SU(2)L × SU(2)R, the only stable bound states are those with K = I + sl = 0. These states can be identified with the low-lying heavy baryons ΛQ and Σ (∗) Q , with I = sl = 0 and 1 respectively. Then one can deduce the decay properties of the bound state from those of the constituents. For example, the Σc → Λcπ decay was studied in Ref. [1]. The decay rate is determined by the axial current coupling g3 defined in Ref. [5]. Γ(Σ c → Λcπ) = g 3 6π |~ pπ| 3 f 2 . (1) In Ref. [1], it was shown that g3 = gsoliton + gheavy (2) where gsoliton = √ |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/hep-ph/9510421v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Automatic calculation of particle interaction or decay Bound state Chirality (chemistry) Delta aminolevulinate:SCnc:Pt:Urine:Qn Ground state Mesons Nucleons Perturbation theory Soliton Telling untruths Topological quantum computer |
| Content Type | Text |
| Resource Type | Article |
