SUSY EFFECTS ON D⁰â†'l⁺l^-AND D_d/s⁺â†'π（K）⁺l⁺l^-DECAYS

The world where we are living in is understood by observing the matter around us and these matters are made of particles. Particle Physics is a science which research these elementary particles and the interaction among them. Particle Physics has provided a opportunity for us to understand the world into microworld that can not be seen by our eyes. At the same time, Particle Physics also promote the development of other subject. It is generally known that the Standard Model of elementary particles has been the most successful theories for Particle Physics. SM is a theory based on gauge group SU(3)(?)SU(2)L(?) U(1)Y and it provide complete description about three interactions except gravitational interaction:strong and electroweak interactions of fundamental particles.However, The SM is not perfect,because there are also many phenomena that can not be solved reasonably, such as dark matter and dark energy. There are still discrepancies between theoretical and experimental that indicates that the SM is not an ultimate theory. It may be an effective theory at low scale. This will provide space for present and developing for New Physics. Heavy flavor physics a perfect region which test SM and study New Physics, and heavy quark flavor changing is also a sensitive process that search signal about New Physics.In this thesis, the Supersymmetry(SUSY) effects on leptonic and semileptonic decays of D mesons are mainly researched. We study these decays of D mesons in the RPV and RPC SUSY. Firstly, we briefly introduce the SM and SUSY which are used in research. Secondly, we study the SUSY effects onD0â†'l+l-and Dd+(s)â†'Ï€(K)+l+l-. Prom the latest experimental data,we obtain the new bounds on NP couplings and MI method also used in this thesis. Our results are stronger than existing bounds and we also predict the SUSY effects on the other quantities that have not been measured by experiment. In our work,it is easy to find that SUSY effects on this quantities could be quite large. The future experiments will test these predictions and provide more strict restriction the relevant parameter of New Physics.