We propose an extended Nambu–Jona-Lasinio model to include the heavy mesons with the heavy quark symmetry. The quark current-current interaction is generalized to include the heavy quark currents. In order to comply with the heavy quark spin symmetry at the heavy quark limit, the quark mass dependence of the interaction strength is introduced. The light and heavy pseudo-scalar and vector meson,...

The top quark, discovered 1995 at Fermilab, is special among the quarks due to its large mass: Its lifetime is shorter than the characteristic hadronization time scale and therefore top bound states do not have time to form. From a calculational point of view this allows an immediate application of perturbation theory to top physics. Up to now top quarks have only been produced in pairs through...

The cooling history of a quark star in the 2-flavour color superconductive (2SC) phase is investigated. In particular the novel process of photon generation via glueball (GLB) decay in the 2SC phase is taken into account. As much as 10−10 erg of energy is provided by the GLB decay. This source of photons fundamentally intrinsic to quark matter in the 2SC phase is unique to our model. The genera...

We propose a method to determine the leptonic decay constant f B in the innnite heavy quark mass limit from the analysis of the radiative decay mode

We study radiative decay modes of the Z-boson into heavy quark bound states. We find that the widths for these decays are extremely small. We conclude that these decays will not be detectable for the time being unless there is a significant increase in the number of Z-bosons produced at the electronpositron colliders. Rare decays of the Z-boson have recently been studied at the ee colliders, CE...

A Higgs boson in the intermediate mass range is considered. An effective Lagrangian approach is used in order to evaluate the top-induced QCD corrections of order α s to the decay into light quarks and O(α s ) corrections to the gluonic decay mode. The connection to the decoupling relations for αs and the light quark masses is discussed. The Higgs boson is the only still missing particle in the...

A bstract We compute the contributions of dimension six two-quark operators to non-leptonic decay width heavy hadrons due flavor changing bottom-to-up-quark transition in quark expansion. Analytical expressions for Darwin term ? D and spin-orbit LS are obtained with leading order accuracy.

The exclusive rare decay B → Kγ takes place in a region of maximum recoil, q = 0, posing a problem for nonrelativistic quark models which are usually thought to be most reliable at zero recoil. The Bauer–Stech–Wirbel (BSW) model, formulated in the infinite–momentum–frame (IMF) formalism, is designed to work at q = 0. We show in this model that the ratio relating the decay B → Kγ and the q–spect...