Analytical calculation is presented of the QCD radiative corrections to the rate of the process b → cτ ν̄τ and to the τ lepton longitudinal polarization in τ ν̄τ rest frame. The results are given in the form of one dimensional infrared finite integrals over the invariant mass of the leptons. We argue that this form may be optimal for phenomelogical applications due to a possible breakdown of semi...

In this paper we discuss possible signatures for the production of scalar t̃1t̃ ∗ 1 (stoponium) bound states σt̃1 at hadron colliders, where t̃1 is the lighter scalar top eigenstate. We first study the decay of σt̃1 ; explicit expressions are given for all potentially important decay modes. If t̃1 has unsuppressed two–body decays, they will always overwhelm the annihilation decays of σt̃1 . Among the ...

We provide a method to test if hadrons produced in high energy heavy ion collisions were emitted at freeze-out from an equilibrium hadron gas. Our considerations are based on an ideal gas at fixed temperature Tf , baryon number density nB, and vanishing total strangeness. The constituents of this gas are all hadron resonances up to a mass of 2 GeV; they are taken to decay according to the exper...

A formalism for the relativistic description of hadron decays within the constituent quark model is presented. First, hadron amplitudes of the light–cone constituent quark model, in particular the weak transition form factors at spacelike momentum transfers, q ≤ 0, are represented in the form of the dispersion integrals over the hadron mass. Second, the form factors at q > 0 are obtained by per...

We study the semileptonic branching fraction of B-meson into higher resonance of charmed meson D by using the Bjorken sum rule and the heavy quark effective theory(HQET). This sum rule and the current experiment of B-meson semileptonic decay into D and D predict that the branching ratio into Dlνl is about 1.7%. This predicted value is larger than the value obtained by the various theoretical ha...

We consider QCD radiative corrections to standard model Higgs-boson production in association with a W boson in hadron collisions. We present a fully exclusive calculation up to next-to-nextto-leading order (NNLO) in QCD perturbation theory. To perform this NNLO computation, we use a recently proposed version of the subtraction formalism. Our calculation includes finite-width effects, the lepto...

The motion of spectator quarks in decay of a beauty hadron is a nonperturbative effect which can usually be neglected. We find that the motion in some decay channels, which contribute total decay widths of beauty hadrons, can not be neglected. The contributions from these decay channels to decay widths are proportional to certain averages of the squared inverse of the momentum carried by a spec...

We suggest a new technique to determine the CKM phase γ without neglecting the (soft) final state rescattering effects. We use (time integrated) B meson decay rates to π's and K's. A set of 5 ∆S = 0 (or 1 ∆S = 0 and 4 ∆S = 1) decay rates is used to compute the strong phases and magnitudes of the tree level and penguin contributions as functions of γ. These are used to predict a ∆S = 1 (∆S = 0) ...

We suggest a new technique to determine the CKM phase γ without neglecting the (soft) final state rescattering effects. We use (time integrated) B meson decay rates to π's and K's. A set of 5 ∆S = 0 (or 1 ∆S = 0 and 4 ∆S = 1) decay rates is used to compute the strong phases and magnitudes of the tree level and penguin contributions as functions of γ. These are used to predict a ∆S = 1 (∆S = 0) ...

Several topics concerning the light hadron spectrum are discussed. Flavor symmetry breaking effects and the problem of quenched chiral logarithm are examined with pion mass data for the Kogut-Susskind quark action, and light meson decay constants for the Wilson action calculated with non-perturbative renormalization constants are discussed. Results for quark masses are also given both for the K...