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The Breit potential plus linear potential radiative transition under the bottom of positronium

Author: ShiTian
Tutor: ChenJianXing
School: Liaoning Normal University
Course: Particle Physics and Nuclear Physics
Keywords: The end of positronium Radiative transition Potential model
CLC: O572.33
Type: Master's thesis
Year: 2011
Downloads: 8
Quote: 0
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Abstract


Study heavy meson mass spectrum , the production and decay properties of the in-depth understanding of hadron spectroscopy and theoretical methods in the development of the non-perturbative region is of great significance . Therefore, the study of heavy meson is one of the important frontier of particle physics . Heavy meson by at least one heavy quarks , they have two important features: First, the heavy quark above 1GeV quality , much larger than the QCD scale 0.2GeV , which makes the strong interaction between the heavy quark is relatively weak , the use of micro- the interference calculation will be able to get more accurate results . On the other hand , the speed of movement of the heavy quark in the heavy meson is low , much less than the speed of light , and therefore expand to heavy quarks speed v , the non-relativistic approximation . From the field theory point of view , the heavy quark mass , QCD can do the countdown commenced in accordance with the quality of the heavy quark the theory called heavy quark effective field theory ( HQEFT ) . While the expanded field theory to heavy quarks speed v called non- relativistic QCD (NRQCD). they deal with the problem of heavy flavor system helps departure from the strict QCD correction , step by step . Another method to deal with the heavy quark system is a potential model , it is a phenomenological approach , has a long history , and has played an important role in the development process of the hadron spectroscopy , is still being used . Potential model has many kinds , but they all have two important features of QCD : asymptotic freedom and confinement . They use the perturbative part of the Coulomb potential as a model , and QCD asymptotic freedom nature corresponds ; the use linear phenomenological potential as confinement part (it has been the lattice QCD confirmed ) , to reflect the nature of the confinement of QCD . Breit potential is one of the important potential model , it automatically includes some relativistic corrections . In addition to the Coulomb interaction part , it also includes the role of spin-orbit , spin - spin interactions and tensor effect . It is extracted from the high-energy scattering amplitude between the quark mainly consider the single- gluon exchange diagram the more stringent QCD base . Interaction potential between the heavy quark in the papers in the form of the Breit potential plus linear confinement potential . It can better give charmonium and the end of the mass spectrum of positronium . On this basis , we calculate the the electromagnetic radiative transition of the end of positronium . The results show that decay width experiment permissible error range .

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
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