پديد آورنده :
حقيقي سيس، محمد
عنوان :
پراكندگي ذرات الكترون-پوزيترون در ميدان مغناطيسي قوي
با در نظر گرفتن ضريب نقض لورنتسd
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
ذرات بنيادي و نظريه ميدان ها
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان
صفحه شمار :
يازده،70 ص.: مصور، جدول، نمودار
استاد راهنما :
بهروز ميرزا
توصيفگر ها :
نقض تقارن لورنتس و سي پي تي , ميدان مغناطيسي قوي , اسپينور ديراك , پراكندگي الكترون-پوزيترون , مدل استاندارد تعميم يافته , توابع ساختار الكترومغناطيسي , گشتاور دوقطبي الكتريكي
استاد داور :
احمد شيرزاد، غلامرضا خسروي
تاريخ ورود اطلاعات :
1399/08/03
تاريخ ويرايش اطلاعات :
1399/08/03
چكيده انگليسي :
Considering the lorentz violating Parameter in electron positron scattering in a srtong magnetic field Muhammad Haghighisis m haghighisis@ph iut ac ir september 20 2020 Department of physics Isfahan University of Technology Isfahan 84156 83111 IranDegree Master of Science Language FarsiSupervisor Behrouz Mirza Prof b mirza@cc iut ac ir AbstractIn this thesis first an overview of the symmetries and their characteristics in physics is presented As for thesymmetries we only focus on discrete symmetries of charge conjugation C parity P time reversal T andLorentz because these symmetries result from Lorentz symmetry forming the basis of the quantum field the ory The second chapter of this thesis discusses the characteristics of the solutions to Dirac equation in thepresence of uniform magnetic fields because the shape of Dirac spinors in the presence of the magnetic fielddiffers from the vacuum state Furthermore we focus on the nature of these solutions and we study the ef fect of the selection of the vector potential on these solutions In this chapter the electron positronscattering to muon antimuon is studied in the presence of a strong magnetic field and it is demonstrated thatthe scattering cross section on the lowest scattering order in the presence of a strong magnetic field is determined by the inverse biquadrate of the center of mass energy However in the vacuum state the scattering cross section depends on the inverse quadrate of the center of mass energy Afterward the violation of CPT and Lorentz symmetries is studied Lorentz and CPT symmetries are exactsymmetries in nature and thus their violation leads to massive consequences in physics These symmetries arenot directly broken or in other words the Lagrangians of particles with different spins do not have terms thatviolate these symmetries Therefore these Lagrangians are constantly subjected to Lorentz and CPT invarianttransformations However these symmetries might break spontaneously The most well known spontaneoussymmetry breaking has occurred in the Higgs mechanism where the breaking led to the production of Higgsboson Therefore a new concept of physics is expected to emerge from the spontaneous symmetry breakingof Lorentz and CPT symmetries Moreover the standard particle model under these symmetries is invariant Therefore a new mechanism has to be proposed to study the violation of Lorentz and CPT symmetries andthis mechanism is called the Standard Model Extension SME It should be noted that the violation of Lorentzsymmetry means the dominant symmetry is always present but the particle Lorentz symmetry is broken Theelectromagnetic structure functions are analyzed thereafter The analysis of the structure functions is importantbecause these functions lead to the violation of the discrete symmetries Among the electromagnetic structurefunctions the electric dipole moment structure is more attractive because the elementary particles lack electricdipole moment per se but the violation of the parity P and time reversal T symmetries leads to the pro duction of non zero electric dipole moment for the particles Besides it is indicated that the electric dipolemoment structure depends on the Lorentz violation tensor and the effect of the electric dipole momentincreases in relation to higher energy levels and In the last chapter you will calculate the cross section of the
استاد راهنما :
بهروز ميرزا
استاد داور :
احمد شيرزاد، غلامرضا خسروي
