Radiative Decays of Light Mesons 

Author  XuLiLi 
Tutor  ChenJianXing 
School  Liaoning Normal University 
Course  Theoretical Physics 
Keywords  Light meson Radiative decay Vector meson  led 
CLC  O572.33 
Type  Master's thesis 
Year  2007 
Downloads  10 
Quotes  0 
Abstract: light meson radiative decay is an important direction of the lowenergy hadron physics research , through its ability to reveal the structure and nature of the light meson . The strong interaction of the basic theory of quantum chromodynamics (QCD), to solve the highenergy hadron ( perturbation) is very effective , but the problem is still very difficult for nonperturbative calculations of lowenergy standard . The dispersion relation of the model of chiral vector meson dominated (VMD) model , including many of the effective theory is constructed in order to study the lowenergy hadron physics people . From the point of view of the effective theory , light meson decay contains the interaction between photons and hadrons . Vector meson dominant model for the interaction of photons and hadrons , achieved greater success . This paper will use the latest experimental data using the SU (3) symmetry and VMD model to study light meson radiative decay . SU (3) In this work , we first define the amount of pseudoscalar meson and vector meson nonet , the use of SU (3) symmetry to write effective Lagrangian and calculate the SU (3) nonet interaction coupling constants GV Pγ relationship . After taking into account the ω ? Φ mixing and η ? , Η ' mixing , calculated the relationship of the physical state of the coupling constants gV Pγ . Finally, we use the relationship of gV Pγ given theoretical value V → Pγ decay width , compared with the experiment . Coupling constants gV Pγ coupling constants GV PV relationship in a second portion of the work , the use of the VMD model , and given the same Add ω? Φ mixing and η ? Η ' mixed before and after the coupling constants gVPV relationship . Using light meson decays into electronpositron pairs , we get the vector meson mixing angle θV = 41.9 ° , the photon hadron coupling strength γρ = 2.524 γY = 0.924 . Finally, we use these values ??gives the theoretical value of the the VMD model under V → Pγ decay widths and compared with the experimental values ??, given the analysis and conclusions .