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چكيده انگليسي :

Feynman Rules in Standard Model Extension Afzal binandeh Afzal binandeh@ yahoo com Date of Submission 2011 03 02 Department of physics Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mansour Haghighat mansour @cc iut ac ir Abstract In standard physics Lorentz symmetry is the feature of nature that says experimental results are independent of the transformation in new frameworks that moves with constant velocity This transformation is Lorentz transformation that make base of the relativity When exist Lorentz symmetry it seams space time to be isotrope At the moment the Lorentz symmetry have a best explanation of particle physics All elementary particles and their nongravitational interactions are very successfully described by a theory called the Standard Model of particle physics At the classical level gravity is well described by Einstein s General Relativity Both these theories have local Lorentz symmetry We have constructed a generalization of the usual Standard Model that has all the conventional desirable properties but that allows for violations of Lorentz and CPT symmetry This theory is called the Standard Model Extension or SME In this work we sue from CPT theorem to linking CPT and Lorentz symmetry Roughly it states that certain theories with Lorentz symmetry must also have CPT symmetry These theories include all the ones used to describe known particle physics The CPT theorem can be used to show that a particle and its antiparticle must have certain identical properties including mass lifetime and size of charge and magnetic moment The laws of physics are exactly Lorentz covariant but at Planck scale this symmetry is broken particularly interesting and conceivably physical source of Lorentz and CPT violation is spontaneous symmetry breaking This common physical effect occurs when symmetry of the dynamics is not respected by the solutions of the theory As we consider the standard model extension to study the Lorentz and CPT violation in a natural extension of the minimal standard model This model includes the CPT and the Lorentz violation terms and preserved gauge invariance energy momentum conservation and covariance under the observer rotations and boosts while the covariance under the particle rotations and boosts is broken In this thesis we used this framework to derive Feynman rules for such an extension of the ordinary standard model We extend the Lagrangian of standard model with enter of Lorentz and CPT violation terms in lepton quark Higgs and Yukawa sections From this extend Lagrangian we calculate the changed vertices and propagators whit doing this work we find that moreover change of standard model vertices there is vertices include flavor changes that interactions that don t exist in the standard model these vertices are and Gauge not exist in standard model Also we find two new vertices among the rules for the Higgs model we don t have these vertices We can apply vertices to form loops in Z boson bosons don t can decay in to Higgs bosons Because Higgs particle is heavy as at the standard propagator and from this way reform the mass of Z boson also it is possible that these vertices

بيننده، افضل

قواعد فاينمن در مدل استاندارد تعميم يافته

تقارن لورنتس , تقارن CPT