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A note on the mass splitting of K*(892)

Chinese Physics C 2008年第11期32卷 862-864页

作者：高道能闫沐霖 Interdisciplinary Center for Theoretical Study and Department of Modern Physics University of Science and Technology of China

Belle Collaboration reported a new observed value of K＊- （892） mass by studying τ^- → Ksπ^-vτ decay, which is significantly different from the current world average value given by Particle Data Group 2006. Motivated by this new data, we revisit the issue on the K^＊0（892）- K^＊±（892） mass splitting. Our theoretical estimation favors the new measurement by Belle Collaboration. Therefore further experimental efforts are urgently needed to improve our understanding of these issues.

关键词： K^*(892) mass splitting chiral constituent quark model

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Flavor mixing and solution structures in Dyson–Schwinger equations for a two-flavor system

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Communications in Theoretical Physics 2024年第10期76卷 64-77页

作者： Xue-ao Chao Yu-xin Liu Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Collaborative Innovation Center of Quantum Matter Center for High Energy Physics Peking University

We solved the Dyson–Schwinger(DS) equations for a two-flavor system with symmetry to study its flavor mixing effects. Initially, we employed the point interaction model and bare vertex approximation to reveal the structure of the solutions. Using the point interaction model, the DS equations can be solved analytically, and we found that these solutions can be classified into three groups, each forming an ellipse. These solutions exhibit SO(2) symmetry, while the original SU(2)symmetry at the Lagrangian level is dynamically broken to SO(2), corresponding to the emergence of flavor mixing effects. However, this flavor mixing effect does not manifest in the final physical *** utilizing the system's SO(2) symmetry, we can diagonalize the propagators of the DS equations,eliminating the flavor mixing effect but causing the originally degenerate masses at the Lagrangian level to split. These mass eigenstates have identical quantum numbers but different masses. If we can correspond these to quark particles of different generations, we can explain why the three generations of quarks have different masses and obtain the corresponding quark mass spectrum. Finally, we provide the corresponding numerical results using a more realistic interaction model.

关键词： dynamic symmetry breaking Dyson-Schwinger equation flavor change mass splitting

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Supersymmetric extension of the minimal dark matter model

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Chinese Physics C 2012年第9期36卷 810-817页

作者：苌雪刘纯马凤才杨硕 State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesP.O.Box 2735 Physics Department Liaoning University Physics Department Dalian University Center for High-Energy Physics Peking University

The minimal dark matter model is given a supersymmetric extension. A super SU（2）L quintuplet is introduced with its fermionic neutral component still being the dark matter, and the dark matter mass is about 19.7 TeV. mass splitting among the quintplet due to supersymmetry particles is found to be negligibly small compared to the electroweak corrections. Other properties of this supersymmetry model are studied, it has the solutions to the PAMELA and Fermi-LAT anomaly, and the predictions in higher energies need further experimental data to verify them.

关键词： dark matter supersymmetry mass splitting coannihilation

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