Novel Ideas in Nonleptonic Decays of Double Heavy Baryons
| Autor: | Jürgen G. Körner, Thomas Gutsche, Valery E. Lyubovitskij, Mikhail A. Ivanov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Quark
Particle physics Physics beyond the Standard Model Ab initio FOS: Physical sciences 01 natural sciences High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences nonleptonic decays lcsh:Nuclear and particle physics. Atomic energy. Radioactivity heavy baryons 010306 general physics Nuclear Experiment Boson Physics covariant constituent quark model 010308 nuclear & particles physics High Energy Physics::Phenomenology Short distance Baryon High Energy Physics - Phenomenology confinement Computer Science::Programming Languages lcsh:QC770-798 High Energy Physics::Experiment Phenomenology (particle physics) hadronization light and heavy quark |
| Zdroj: | Particles Volume 2 Issue 2 Pages 21-356 Particles, Vol 2, Iss 2, Pp 339-356 (2019) |
| ISSN: | 2571-712X |
| DOI: | 10.3390/particles2020021 |
| Popis: | The recent discovery of double charm baryon states by the LHCb Collaborarion and their high precision mass determination calls for a comprehensive analysis of the nonleptonic decays of double and single heavy baryons. Nonleptonic baryon decays play an important role in particle phenomenology since they allow to study the interplay of long and short distance dynamics of the Standard Model (SM). Further, they allow one to search for New Physics effects beyond the SM. We review recent progress in experimental and theoretical studies of the nonleptonic decays of heavy baryons with a focus on double charm baryon states and their decays. In particular, we discuss new ideas proposed by the present authors to calculate the $W$-exchange matrix elements of the nonleptonic decays of double heavy baryons. An important ingredient in our approach is the compositeness condition of Salam and Weinberg, and an effective implementation of infrared confinement both of which allow one to describe the nonperturbative structure of baryons composed of light and heavy quarks. Further we discuss an ab initio calculational method for the treatment of the so-called $W$-exchange diagrams generated by $W^{\pm}$ boson exchange between quarks. We found that the $W^{\pm}$-exchange contributions are not suppressed in comparison with the tree-level (factrorizing) diagrams and must be taken into account in the evaluation of matrix elements. Moreover, there are decay processes such as the doubly Cabibbo-suppressed decay $\Xi_c^+ \to p \phi$ recently observed by the LHCb Collaboration which is contributed to only by one single $W$-exchange diagram. Comment: 17 pages. arXiv admin note: text overlap with arXiv:1812.09212 |
| Databáze: | OpenAIRE |
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