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Heavy Mesons and Baryons in a Chiral Quark Model

Author: ZhaoQiaoYan
Tutor: LiangXiXia;ZhangDan
School: Inner Mongolia University
Course: Theoretical Physics
Keywords: Chiral quark model Heavy flavor meson Heavy flavor baryon
CLC: O572.33
Type: Master's thesis
Year: 2011
Downloads: 13
Quote: 0
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Abstract


Quantum chromodynamics (QCD) is the basic theory of the strong interaction, it has three basic properties: chiral symmetry (chiral symmetry), the color confinement (COLOR confinement) and asymptotic freedom (asymptotic freedom). Asymptotically free nature of perturbation theory can successfully deal with the high-energy behavior of the strong interaction, but in the low-energy hadron physics, due to the non-perturbative QCD for solving difficulties, people in the low-energy hadron interactions still need the help of the the various QCD basic spirit of the phenomenological model. The hand sign SU (3) quark model and extended the hand sign SU (3) quark model can successfully explain the ground state baryons the energy, the combination of the deuteron, the nucleon - nucleon scattering phase shift, nuclear - hyperon scattering cross-section, The nuclear-K meson scattering phase shift, as well as other light quark systems. Encouraged by these successful, we handle the quark model to further promote research contains heavy flavor quark meson and heavy subsystem. Preliminary calculations, some interesting results: single gluon exchange potential Yukawa form, the use of variational method in the chiral SU (3) quark model and the extended chiral SU (3) quark model calculation with a single heavy quark mesons D, D *, Ds, Ds *, B, B *, BS, BS * of quality. A system of heavy flavor quark model parameters obtained by fitting the experimental data with heavy flavor mesons and analysis within the meson interactions with parameters trend. The results showed that: meson within one gluon exchange potential, confinement potential are attractive; the one gluon coupling coefficient GQ unchanged, QQ-between attractiveness increases with the increase of the heavy quark mass MQ; heavy quark mass mQ constant is gQ increases as one gluon coupling coefficient QQ-between one gluon exchange potential gravity increases, the the gravitational confinement potential decreases. (2) single-gluon exchange potential use of delta (x) form, the variational method in the chiral SU (3) quark model calculation containing a single heavy flavor quark JP = 1/2 ground state baryon energy. The first value again by the the heavy flavor meson quality of experiment fitting heavy quark model parameters ΣQ ΞQ, the energy value is higher than the corresponding experimental values ??up to completely meet the the heavy flavor meson energy value of case, the baryon Q, a 90MeV; when the confinement potential parameters within a reasonable range of appropriate regulation, can be the ΣQ energy with the experimental values, the Q value is very close to the experimental data, and the numerical results of ΞQ height of about somewhat less than the experimental value 50-70MeV. The same time, we also baryon interactions within the analysis.

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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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