The Phenomenological Study On The Decays Of A Doubly-heavy Baryon To A Singly-heavy Baryon And A Light Vector Meson

Particle physics is about the basic building blocks of matter and their interactions.Searching for the doubly-heavy baryon is a frontier of particle physics.In this paper,we perform a systematic phenomenological study on the processes of doubly heavy baryons(Bbc)decay to a singly heavy baryon(Bb)and a light vector meson(V).In 2017,the doubly-heavy baryons (?)cc++ was discovered.Now,it is the only doubly-heavy baryon ever found,and the rest of these particles are still missing.It demonstrates that this research is very important for searching for new particles.Our calculation is performed as follows.Firstly,we list the quark diagrams and triangle diagrams of all decay channels.Secondly,the optical theorem is used to segment the triangle graph,and the short distance contribution is calculated by the factorization hypothesis,while the long distance contribution is calculated by the final state interactions.Thirdly,the decay widths and branching ratios are calculated.Finally,the best decay channel for the new particle discovery is selected.It can be seen from the analysis that three large decay channels are selected,which belong to the CKM favored contribution.However,considering the reconstruction,we suggest that decay channels (?)bc+??b+K-?+,(?)bc0??b0K-?+ and ?bc?(?)b0K-?+ are the best candidates to search for doubly-baryons (?)bc+,(?)bc0 and ?bc.