Search

We calculate B ̄ s 0 → ϕ translation form factors V , A 0 , A 1 , A 2 based on QCD sum rule and study the nonleptonic two-body decay of B ̄ s 0 → J / ψ ϕ with the form factors obtained. We calculate the time-integrated branching ratio of B ̄ s 0 → J / ψ ϕ decay. The results for both the total branching ratio and the cases for the final vectors in longitudinal and transverse polarizations are consistent with experimental data. [ABSTRACT FROM AUTHOR]

In this work, we study the radiative leptonic decays of and mesons in the Standard Model (SM) and two-Higgs-doublet-model (2HDM) Type II. The results are obtained using the factorization procedure, and the contribution of the order is included. The numerical results are calculated using the wave function obtained in relativistic potential model. As a result, the decay mode is found to be sensitive to the effect of the charged Higgs boson. Using the constraint on the free parameters of 2HDM given in previous works, we find the contribution of the charged Higgs boson in the decay mode can be as large as about 13%. [ABSTRACT FROM AUTHOR]

We study the electromagnetic Dalitz decay modes of J/ψ → P l+l- (P = π0, η or η′). In these decays, the lepton pairs are formed by internal conversion of an intermediate virtual photon with invariant mass ml+l-. Study of the effective-mass spectrum of the l+l- will shed light on the dynamic transition form factor , which characterizes the electromagnetic structure arising at the vertex of the transition J/ψ to pseudoscalars. We also discuss the direct productions of a GeV scale vector U boson in these processes J/ψ → PU (U → l+l-). It is responsible for mediating a new U(1)d interaction, as recently exploited in the context of weakly interacting massive particle dark matter. In this paper, we firstly use the usual pole approximation for the form factor to estimate the decay rate of J/ψ → P l+l- in the Standard Model. Then the reach of searching for the dark photon is estimated. We suggest that these Dalitz decays can be used to search for the light U boson in the BESIII experiment with a huge J/ψ data set. [ABSTRACT FROM AUTHOR]

In the e+e- annihilation processes $e^+e^-\to D^0\bar{D}^0$, D+D- near or above the threshold of $D\bar{D}$, there are not only the resonance contribution $e^+e^-\to \psi (3770)\to D^0\bar{D}^0$, D+D-, but also the continuum contribution through virtual photon directly $e^+e^-\to \gamma^*\to D^0\bar{D}^0$, D+D-. The amplitudes through virtual photon directly and through resonance can interfere seriously. We consider the continuum and interference effect in the $D\bar{D}$ production process in e+e- annihilation. We find that the effect is significant near and above the threshold of the $D\bar{D}$ mesons. [ABSTRACT FROM AUTHOR]

The decay constant of $K_0^*(1430)$ is the key quantity to determine the production rate of $K_0^*(1430)$ in τ decays. By assuming $K_0^*(1430)$ is the lowest scalar bound state of $s\bar q$, the decay constant can be calculated reliably in QCD sum rule. Then the decay branching ratio of $\tau\to K_0^*(1430)\nu$ is predicted to be about (7.9±3.1)×10-5. If this branching ratio can be measured by experiment, it should be helpful to make clear the structure of $K_0^*(1430)$. [ABSTRACT FROM AUTHOR]