Studying Semi-leptonic Decays Of Heavy Hadron

The standard model is an effective theory which is based on the gauge group and describes the strong interaction and the weak electric interaction.However,it is not perfect enough to be impeccable.There are still some problems such as,dark energy of dark matter and neutrino mass have not been solved yet.There is a deviation between the predicted values of the standard model theory and the experimental results for the branching ratio of some decays.This indicates that the standard model of particle physics is not a complete theory that generalizes all the problems of particle physics.So,there is a lot of room for development for new physics that goes beyond the standard modelPhysicists think that the standard model is only an effective theory suitable for the low energy region,and there should be new physics in the corresponding high energy region.Therefore,searching for possible new physical signals has become one of the mainstream directions in the development of high energy physics.Generally,there are two main ways to new physical signals beyond the standard model,for example,search for new particle at CMS and ATLAS of large hadron collider,another is to search for indicated new physics,for an example,explore new physics effect in the B meson decays and mixings at LHCb of large hadron collider.At present,many kinds of new physics models,for examples,the model of G(221)and the R-parity violating supersymmetry model,have been appeared.Nevertheless,these new physics models still needs to be further tested in experiments.At present,some deviations,like R(D(*)),between the experimental measurements and their standard model predictions as well as the structure of some particles as a0(980)have become one of resecrch hotspots.In this paper,we first study the decay of heavy taste mesons and baryons in the final state with light scalar mesons,for instance the decay D ? a0(980)e+ve.The numerical range of the form factor is calculated,and the branch ratio is obtained,the results of the branching ratio can be conpared with the experiment in the future and determine that whether a?(980)is a two-quark state.This result is very important for understanding the structure of hadron states,and gives a reliable theoretical explanation scheme for the structural problems of ao(980).Secondly,the R(D(*)and relevant B?D(*)t-vt decays process have been by model independence,the G(221)model with lepton universality and the R-parity violating supersymmetry model.The related new physical coupling parameter space is obtained and found that the experimental values have significant limitations on relevent parameters under the model independent and G(221)model.There are obvious new physical effects on the lepton spin asymmetries and the forward-backward asymmetries.The experimental data give a new limit on the coupling due to supre-lepton exchanges in the R-parity violating supersymmetry model,and the spatial distribution of the coupling parameters are better than previous studies.Otherwise,in the R-parity violating supersymmetry model,at the same time,we also explored the Bc?J/?l-vl,Bc??cl-vl and ?b??cl-vl decays process.The results shows that the coupling parameters of super-lepton exchange have a new physical effect on the branching ratio and forward-backward asymmetry.These result is related to the detection of direct supersymmetric signals on the LHC-b and the Belle-?.