Nonspectator effects andBmeson lifetimes from a field-theoretic calculation

Nonspectator Effects and B Meson Lifetimes from a Field-theoretic Calculation

The B meson lifetime ratios are calculated to the order of 1/mb in the heavy quark expansion. The predictions of those ratios are dependent on four unknown hadronic parameters B1, B2, ε1 and ε2, where B1 and B2 parametrize the matrix elements of color singlet-singlet four-quark operators and ε1 and ε2 the matrix elements of color octet-octet operators. We derive the renormalization-group improv...

Calculation of Electronic Lifetimes in Molecular Junctions

We study the electronic lifetimes in molecular junctions using the Keldysh nonequilibrium Green function (NEGF) model. It is found that two characteristic time scales which govern the electron tunneling phenomena. One is the electronic lifetime in which electronic energy in the molecular electronic state dissipates into the right/left electrode or vibrational mode, the other is the residence ti...

Membranes: A Field-Theoretic Description

Dirac theory from a field theoretic point of view

Several complications arise in quantum field theory because of the infinite many degrees of freedom. However, the distinction between one-particle and many-particle effects – mainly induced by the vacuum – is not clear up to now. A field theoretic picture of the one-particle Dirac theory is developed in order to explore such questions. Main emphasis is laid on the injection of Grassmann’s algeb...

A Class–field Theoretical Calculation

In this paper, we give the complete characterization of the p–torsion subgroups of certain idèle–class groups associated to characteristic p function fields. As an application, we answer a question which arose in the context of Tan’s approach [Ta1] to an important particular case of a generalization of a conjecture of Gross [Gro] on special values of L–functions. 1. Notation and motivation Let ...