Nonleptonic Decays of Doubly Charmed Baryons

Abstract

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.

B Meson Decays in the Covariant Confined Quark Model

“…Finally, we have to mention that the CCQM is suitable for description of various multi-quark states, including baryons [46,47] and tetraquarks [48]. In this text, we focus on mesons; the approach is, in other cases, very similar: the interpolating quark current is constructed for a given number of quarks (more alternatives can be considered) and multiplied by the hadronic field to provide the interaction Lagrangian.…”