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

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
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Abstract: light meson radiative decay is an important direction of the low-energy 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 high-energy hadron ( perturbation) is very effective , but the problem is still very difficult for non-perturbative calculations of low-energy 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 low-energy 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 electron-positron 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 .

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