Study Of Ununiversal Z' Boson Effects In ?~-??~-PP Decays

To some extent,the standard model(SM)has been excellently successful in theoreticalpredictions,most of which are confirmed by experiment.However,it still exists manydeficiencies,for example,the lepton flavor violating(LFV)problem predicted by the neutrinooscillations.It is expected that there must exist more basic theory in high energy scale.Sincethe charged lepton flavor violating processes have the advantages of small hadronicuncertainty,clean background,etc.,the observation of these processes in experiments will bea signal of new physics beyond the SM.Compared with the e and ? leptons,the ?lepton has a more heavy mass and more decays,? LFV processes become good place toprobe new physics.Studing the ? LFV processes in the new scenarios is helpful to obtainthe model information,and provide references to the LFV mechanism.In the experiment,Belle,Babar and LHCb experimental groups have measured ? LFVprocesses,such as radiative decays ??ly,semi-leptonic decays ??lP(IPP),pureleptonic decays ??3l.Belle's integrated luminosity has reached 1041fb-1,and willreached 50ab-1 in the future.LHCb's current integrated luminosity is 3.2fbfb-1,willimproved to 5fb-1.Theoretically,physicists have studied ??ly,??lP(lPP),??3l decays invarious new physics models and presented their theoretical predictions.The results show thattheir decays branching ratios can be improved to O(10-8)?O(10-6).This thesis studies the ??l-PP(PP = KK,?+?-)decays in the Un-universal Z'model.In the SM,this process is forbidden.While in the Un-universal Z' model,when theleptons and quarks exist mixing,the extra new boson's flavor changing coupling will produce off-diagonal flavor changing neutral current,and then ?-?l-PP(PP = KK,?+?-)decayscan occur in the tree level through the new neutral boson.In the process of calculation,ignoring the mixing between Z and Z' boson,and considering the contributions ofresonance and non-resonant form factors to the hadronic matrix elements,we study the?-?l-PP(PP = KK,?+?-)branching ratios and the invariable mass spectrum of the finalstate mesons.The results show that:the model parameters ???(re)L(R)are constrained at the orderof O(10-3)by the current experimental upper limits.For the di-kaon final states,thecontribution of resonant form factor FSR is dominated among those of form factors.We alsoanalysis the relationship between ?-?l-KK differential decay rates and the di-kaoninvariant mass 4s s(s = m2KK),and find that the ?(1020)vector resonance is dominant in thescope of di-kaon invariant mass.For the di-pion final states process,the contribution of?(770)vector is dominant the di,pion invariant mass spectrum.We calculate the branchingratios of B+ ? K+l±?± decays by using constrainted model parameter,and find that incurrent parameter space,the branching ratios of B+ ? K+l±?± decays can not be measuredby the current colliders.The super-B Factory will start to run on 2018,and the LHCb continues measuring rlepton flavor violating process,which will accumulate more data and further promote thetheoretical strudies of the LFV.