Basing on the branching fractions of J/psi to VP from different experiments, we investigate on the properties of the coupling constants of J/psi to VP decays with a model-dependent approach. We find that the octet coupling constant, g_8, of strong in
teraction is about twice larger than that of the singlet coupling constant g_1; the electromagnetic breaking parameters g^i_E are larger than the mass breaking parameters g^i_M, moreover, the three parameters of electromagnetic effect are about equal, but the three parameters of mass effect are obviously different and their uncertainties are also large; and the phase angle between strong and electromagnetic interaction is in the range of 70^{circ} sim 80^{circ}. It deepens our understanding of the coupling constant of J/psi to VP decays.
In this paper we calculate the production of a charged top pion in association with a W boson via gg fusion at the CERN Large Hadron Collider in the context of the topcolor assisted technicolor model. We find that, the total cross section of pp --> g
g --> W^{pm}pi_t^{mp}, is several dozen femtobarns with reasonable values of the parameters, and the total cross section of pp --> W^{pm}pi_t^{mp} can reach a few hundred femtobarns when we consider the sum of the contributions of these two parton subprocesses gg --> W^{pm}pi_t^{mp} and bbar{b} --> W^{pm}pi_t^{mp}.
In this paper we calculate the technicolor correction to the production of a charged top pion in association with a W boson via bbar{b} annihilation at the CERN Large Hadron Collider in the context of the topcolor assisted technicolor model. We find
that the cross section of pp rightarrow bbar{b} -> W^{pm}pi_t^{mp} at the tree level can reach a few hundred femtobarns for reasonable ranges of the parameters, roughly corresponding to the result of the process pp -> bbar{b} -> W^{pm}H^{mp} in the minimal supersymmetric standard model; the relative corrections arising from the one-loop diagrams are about a few percent to two dozen percent, and they will increase the cross section at the tree level. As a comparison, we also discuss the size of the hadron cross section via the other subprocess gg -> W^{pm}pi_t^{mp}.
We have studied the associated production processes of a neutral top-Higgs in the topcolor assisted technicolor model with a pair of heavy quarks in gammagamma collisions at the International Linear Collider (ILC). We find that the cross section for
tbar{t}h_t in gammagamma collisions is at the level of a few fb with the c.m. energy sqrt{s}=1000 GeV, which is consistent with the results of the cross section of tbar{t}H in the standard model and the cross section of tbar{t}h in the minimal supersymmetric standard modeland the little Higgs models. It should be distinct that hundreds of to thousands of h_t per year can be produced at the ILC, this process of gammagamma to tbar{t}h_t is really interesting in testing the standard model and searching the signs of technicolor.
