102,506 research outputs found

    Dibaryons with two heavy quarks

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    The relativistic six-quark equations are constructed in the framework of the dispersion relation technique. The relativistic six-quark amplitudes of dibaryons including the light uu, dd and heavy cc, bb quarks are calculated. The approximate solutions of these equations using the method based on the extraction of leading singularities of the heavy hexaquark amplitudes are obtained. The poles of these amplitudes determine the masses of charmed and bottom dibaryons with the isospins I=0, 1, 2 and the spin-parities JP=0+J^P=0^+, 1+1^+, 2+2^+.Comment: 10 pages, types corrected. arXiv admin note: substantial text overlap with arXiv:1105.081

    Heavy dibaryons

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    The relativistic six-quark equations are found in the framework of the dispersion relation technique. The approximate solutions of these equations using the method based on the extraction of leading singularities of the heavy hexaquark amplitudes are obtained. The relativistic six-quark amplitudes of dibaryons including the light quarks uu, dd and heavy quarks cc, bb are calculated. The poles of these amplitudes determine the masses of charmed and bottom dibaryons with the isospins 1/2, 3/2, 5/2.Comment: 16 page

    Resonating group method study of kaon-nucleon elastic scattering in the chiral SU(3) quark model

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    The chiral SU(3) quark model is extended to include an antiquark in order to study the kaon-nucleon system. The model input parameters bub_u, mum_u, msm_s are taken to be the same as in our previous work which focused on the nucleon-nucleon and nucleon-hyperon interactions. The mass of the scalar meson σ\sigma is chosen to be 675 MeV and the mixing of σ0\sigma_0 and σ8\sigma_8 is considered. Using this model the kaon-nucleon SS and PP partial waves phase shifts of isospin I=0 and I=1 have been studied by solving a resonating group method (RGM) equation. The numerical results of S01S_{01}, S11S_{11}, P01P_{01}, P03P_{03}, and P11P_{11} partial waves are in good agreement with the experimental data while the phase shifts of P13P_{13} partial wave are a little bit too repulsive when the laboratory momentum of the kaon meson is greater than 500 MeV in this present calculation.Comment: 17 pages, 6 figures. Final version for publicatio

    Baryon-meson interactions in chiral quark model

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    Using the resonating group method (RGM), we dynamically study the baryon-meson interactions in chiral quark model. Some interesting results are obtained: (1) The Sigma K state has an attractive interaction, which consequently results in a Sigma K quasibound state. When the channel coupling of Sigma K and Lambda K is considered, a sharp resonance appears between the thresholds of these two channels. (2) The interaction of Delta K state with isospin I=1 is attractive, which can make for a Delta K quasibound state. (3) When the coupling to the Lambda K* channel is considered, the N phi is found to be a quasibound state in the extended chiral SU(3) quark model with several MeV binding energy. (4) The calculated S-, P-, D-, and F-wave KN phase shifts achieve a considerable improvement in not only the signs but also the magnitudes in comparison with other's previous quark model study.Comment: 5 pages, 2 figures. Talk given at 3rd Asia Pacific Conference on Few-Body Problems in Physics (APFB05), Korat, Nakhon Ratchasima, Thailand, 26-30 Jul 200

    S, P, D, F wave KN phase shifts in the chiral SU(3) quark model

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    The SS, PP, DD, FF wave KNKN phase shifts have been studied in the chiral SU(3) quark model by solving a resonating group method equation. The numerical results of different partial waves are in agreement with the experimental data except for the cases of P13P_{13} and D15D_{15}, which are less well described when the laboratory momentum of the kaon meson is greater than 400 MeV.Comment: Prepared for 10th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2004), Beijing, China, 29 Aug - 4 Sep 200
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