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It is well recognized that looking for new physics at lower energy colliders is a tendency which is complementary to high energy machines such as LHC. Based on large database of BESIII, we may have a unique opportunity to do a good job. In this paper we calculate the branching ratios of semi-leptonic processes $D^+_s to K^+ e^-e^+$, $D^+_s to K^+ e^-mu^+$ and leptonic processes $D^0 to e^-e^+$, $D^0 to e^-mu^+$ in the frames of $U(1)$ model, 2HDM and unparticle separately. It is found that both the $U(1)$ and 2HDM may influence the semi-leptonic decay rates, but only the $U(1)$ offers substantial contributions to the pure leptonic decays and the resultant branching ratio of $D^0 to e^-mu^+$ can be as large as $10^{-7}sim10^{-8}$ which might be observed at the future super $tau$-charm factory.
The recent experimental developments require a more precise theoretical study of weak decays of heavy baryon $Lambda_b^0$. In this work, we provide an updated and systematic analysis of both the semi-leptonic and nonleptonic decays of $Lambda^0_b$ in
New Physics can show up in various well-known processes already studied in the Standard Model, in particular by modifying decay rates to some extent. In this work, I examine leptonic decays of $Upsilon$ vector resonances of bottomonium below $Bbar{B}
The measured rate for D_s -> l nu decays, where l is a muon or tau, is larger than the standard model prediction, which relies on lattice QCD, at the 3.8 sigma level. We discuss how robust the theoretical prediction is, and we show that the discrepan
We present a comprehensive update of the bounds on R-Parity violating supersymmetric couplings from lepton-flavour- and lepton-number-violating decay processes. We consider tau and mu decays as well as leptonic and semi-leptonic decays of mesons. We
We give a short and basic introduction to our covariant Dyson-Schwinger-Bethe-Salpeter-equation approach using a rainbow-ladder truncated model of QCD, in which we investigate the leptonic decay properties of heavy quarkonium states in the pseudoscal