Current Mixing and Properties of Vector Bosons in Preon Model with Preonic Charge

Abstract

In the preon model with preonic charge, new vector boson which can mix with the photon exists. On the basis of the current mixing model, its properties are studied. Cross sections of e^+e^- →U boson pair and of l_s-nucleus scattering are given. It will be also shown that, if the new vector boson is sufficiently heavy (say ∼500 GeV), the success of the standard model at the LEP level is naturally reproduced. Small deviations from the standard model are predicted in a definite way, which seems to be rather supported by the data. Our model leads to lighter W boson than the standard model does and to positive e_b parameter in contrast to the standard model.