Weak decays of doubly heavy charm $$\Omega _{cc}^{+}$$ Ω cc + baryon

Dhir, Rohit; Sharma, Neelesh

doi:10.1140/epjc/s10052-018-6220-3

Cited by 31 publications

(22 citation statements)

References 97 publications

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“…F(0), m f it and δ correspond to the three fitting parameters in Eq. (30) or (31). The results without asterisks are obtained by fitting the form factors with Eq.…”

Section: Transition Form Factorsmentioning

confidence: 99%

Light-cone sum rules analysis of $$\Xi _{QQ^{\prime }q}\rightarrow \Lambda _{Q^{\prime }}$$ weak decays

2019

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We analyze the weak decay of doubly-heavy baryon decays into anti-triplets Q with light-cone sum rules. To calculate the decay form factors, both bottom and charmed anti-triplets b and c are described by the same set of leading twist light-cone distribution amplitudes. With the obtained form factors, we perform a phenomenology study on the corresponding semi-leptonic decays. The decay widths are calculated and the branching ratios given in this work are expected to be tested by future experimental data, which will help us to understand the underlying dynamics in doublyheavy baryon decays.

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“…F(0), m f it and δ correspond to the three fitting parameters in Eq. (30) or (31). The results without asterisks are obtained by fitting the form factors with Eq.…”

Section: Transition Form Factorsmentioning

confidence: 99%

Light-cone sum rules analysis of $$\Xi _{QQ^{\prime }q}\rightarrow \Lambda _{Q^{\prime }}$$ weak decays

2019

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“…In Table 11, we compare our rate results with the results of some other approaches [37][38][39][40][41][42]. All calculations approximately agree on the rate of the decay Ξ ++ cc → Ξ + c + ρ + , which is predicted to have a large branching ratio of ∼ 16 %.…”

Section: Numerical Resultsmentioning

confidence: 60%

“…Width (in 10 −13 GeV) GIKLT [22,43] DS [37,39] JHL [38] WYZ [40] YJLLWZ [41] KL [42] Ξ The only free parameter in our approach is the size parameter Λ cc of the double heavy baryons, for which we have chosen Λ cc = 0.8675 GeV in Tables 7-10. In order to estimate the uncertainty caused by the choice of the size parameter, we allow the size parameter to vary from 0.6 to 1.135 GeV.…”

Section: Modementioning

confidence: 99%

Nonleptonic Decays of Doubly Charmed Baryons

Иванов

2020

Particles

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In this lecture, we provide a basic introduction into the topic of charmed baryons and their nonleptonic two-body decays. Some features of the baryon weak decays on the quark level are discussed in detail in the framework of effective field theory. The calculation of the matrix elements of the four-quark operators arising in the effective theory proceeds by using the covariant constituent quark model. The model allows one to evaluate not only the factorizing tree-level diagrams but also more complicated diagrams with the internal W-exchange. The technique required for such calculation is discussed in some detail. Finally, the numerical results are presented, and comparison of the contributions coming from the W-exchange diagrams with those from the tree-level are carefully performed.

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“…Width (in 10 −13 GeV) GIKLT [31,32] DS [18,19] into account W-exchange contributions. One can see from our analysis that the W-exchange contributions are generally not suppressed.…”

Section: Modementioning

confidence: 99%

“…In Ref. [19] the same approach has been applied to the nonleptonic decay modes of the double charm strange Ω + cc baryon. It was found that the branching ratios of some of the nonleptonic Ω + cc decay modes obtain contributions solely from W-exchange diagrams, resulting in branching ratios as large as ∼ O(10 −2 ).…”

Section: Introductionmentioning

confidence: 99%

Novel Ideas in Nonleptonic Decays of Double Heavy Baryons

et al. 2019

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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 ± boson exchange between quarks. We found that the W ± -exchange contributions are not suppressed in comparison with the tree-level (factorizing) 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 Ξ + c → pφ recently observed by the LHCb Collaboration which is contributed to only by one single W-exchange diagram. ForewordThis paper is written in memory of Garry Efimov . For two of us (Mikhail Ivanov and Valery Lyubovitskij) Garry Efimov was a teacher and subsequently an important collaborator. He significantly contributed to the development of nonlocal quantum field theory and its relation to hadron structure. In particular, he showed that the nonlocal structure of hadron-quark interactions is important for a realistic description of the nonperturbative features of the strong interaction contributions at large distances. Phenomena such as hadronization and confinement can be consistently implemented in field-theoretical approaches based on nonlocal phenomenological Lagrangians. Garry Efimov with his pupils and collaborators developed a series of relativistic quark models based on nonlocal Lagrangians.

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Weak decays of doubly heavy charm $$\Omega _{cc}^{+}$$ Ω cc + baryon

Cited by 31 publications

References 97 publications

Light-cone sum rules analysis of $$\Xi _{QQ^{\prime }q}\rightarrow \Lambda _{Q^{\prime }}$$ weak decays

Light-cone sum rules analysis of $$\Xi _{QQ^{\prime }q}\rightarrow \Lambda _{Q^{\prime }}$$ weak decays

Nonleptonic Decays of Doubly Charmed Baryons

Novel Ideas in Nonleptonic Decays of Double Heavy Baryons

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