نتایج جستجو برای: Four-Fermion Lagrangian
تعداد نتایج: 659262 فیلتر نتایج به سال:
Characteristic features of dynamical symmetry breaking are investigated in Randall-Sundrum (RS) background. To study the influence of bulk fermion or bulk gauge field I consider a five-dimensional four-fermion interaction model and a non-Abelian gauge field theory as simple models where the chiral symmetry is broken down dynamically. Using a four-dimensional Lagrangian induced from the five-dim...
One of the most important reactions of the URCA that lead to the cooling of a neutron star, is neutron beta-decay ( ). In this research, the energy spectra and wave functions of massive fermions taking into account the Anomalous Magnetic Moment (AMM) in the presence of a strong changed magnetic field are calculated. For this purpose, the Dirac-Pauli equation for charged and neutral fermions is ...
Pure spinor formalism and non-integrable exponential factors are used for constructing the conformal-invariant wave equation and Lagrangian density for massive fermion. It is proved that canonical Dirac Lagrangian for massive fermion is invariant under induced projective conformal transformations.
Using a four fermion interaction Lagrangian, we demonstrate that the spontaneous breaking of vector symmetries requires the existence of a light (comparing with the heavy fermion mass) scalar particle and the low energy effective theory (the σ model) obtained after integrating out heavy fermion degrees of freedom is asymptotically a renormalizable one. When applying the idea to the electroweak ...
Heavy quark effective theory (HQET) [1,2] is a useful tool for studying the physics of hadrons containing a single heavy quark. The HQET Lagrangian has an expansion in powers of derivatives divided by the heavy quark mass m, which translates into an expansion of hadronic quantities in powers of ΛQCD/m, where ΛQCD is the non-perturbative scale parameter of the strong interactions. The HQET Lagra...
We complete the one loop renormalization of the HQET lagrangian at O(1/mQ) including four fermion operators with two heavy and two light quark fields in the operator basis. It is shown that as a consequence the short distance coefficients of the operators bilinear in the heavy quark field receive nontrivial corrections. ¶email: [email protected]
We complete the one loop renormalization of the HQET lagrangian at O(1/m3Q) including four fermion operators with two heavy and two light quark fields in the operator basis. It is shown that as a consequence the short distance coefficients of the operators bilinear in the heavy quark field receive nontrivial corrections. email: [email protected]
We extend our lagrangian technique for chiral perturbation theory for quenched QCD to include theories in which only some of the quarks are quenched. We discuss the relationship between the partially quenched theory and a theory in which only the unquenched quarks are present. We also investigate the peculiar infrared divergences associated with the η ′ in the quenched approximation, and find t...
We present a study of the non-local lagrangian approach to incorporate higher-order effects in e+e− → n fermions. In its minimal version, the nonlocal lagrangian approach is found to exhibit problems with unitarity and high-energy behaviour. We identify the origin of these problems and obtain some first clues about possible solutions by investigating the zero-mode solutions of the Ward Identiti...
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