Dynamics of strong and radiative decays of Ds-mesons in the hadrogenesis conjecture

  • The positive parity scalar Ds0*(2317) and axial-vector Ds1*(2460) charmed strange mesons are gene-rated by coupled-channel dynamics through the s-wave scattering of Goldstone bosons off the pseudoscalar and vector D(Ds)-meson ground states. The specific masses of these states are obtained as a consequence of the attraction arising from the Weinberg-Tomozawa interaction in the chiral Lagrangian. Chiral corrections to order Qχ2 are calculated and found to be small. The Ds0*(2317) and Ds1*(2460) mesons decay either strongly into the isospin-violating π0Ds and π0Ds* channels or electromagnetically. We show that the π0-η and (K0D+-K+D0) mixings act constructively to generate strong widths of the order of 140 keV and emphasize the sensitivity of this value to the KD component of the states. The one-loop contribution to the radiative decay amplitudes of scalar and axial-vector states is calculated using the electromagnetic Lagrangian to chiral order Qχ2. We show the importance of taking into account processes involving light vector mesons explicitly in the dynamics of electromagnetic decays. The radiative width are sensitive to both ηDs and KD components, hence providing information complementary to the strong widths on the positive parity Ds-meson structure.

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  • [1] . Godfrey S, Isgur N. Phys. Rev. D, 1985, 32: 189-2312. Aubert B et al. Phys. Rev. D, 2006, 74: 0320073. YAO W M et al. J. Phys. G, 2006, 33: 1-12324. Lutz M F M, Soyeur M. Nucl. Phys. A, 2008, 813: 14-955. Lutz M F M, Kolomeitsev E E. Found. Phys., 2001, 31:1671-17026. Lutz M F M, Kolomeitsev E E. Nucl. Phys. A, 2002, 700:193-3087. Lutz M F M, Kolomeitsev E E. Nucl. Phys. A, 2004, 730:392-4168. Kolomeitsev E E, Lutz M F M. Phys. Lett. B, 2004, 582:39-489. Hofmann J, Lutz M F M. Nucl. Phys. A, 2004, 733: 142-15210. Gasser J, Leutwyler. Nucl. Phys. B, 1985, 250: 465-516
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M. F. M. Lutz. Dynamics of strong and radiative decays of Ds-mesons in the hadrogenesis conjecture[J]. Chinese Physics C, 2010, 34(9): 1320-1323. doi: 10.1088/1674-1137/34/9/032
M. F. M. Lutz. Dynamics of strong and radiative decays of Ds-mesons in the hadrogenesis conjecture[J]. Chinese Physics C, 2010, 34(9): 1320-1323.  doi: 10.1088/1674-1137/34/9/032 shu
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Received: 2010-02-09
Revised: 1900-01-01
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Dynamics of strong and radiative decays of Ds-mesons in the hadrogenesis conjecture

Abstract: 

The positive parity scalar Ds0*(2317) and axial-vector Ds1*(2460) charmed strange mesons are gene-rated by coupled-channel dynamics through the s-wave scattering of Goldstone bosons off the pseudoscalar and vector D(Ds)-meson ground states. The specific masses of these states are obtained as a consequence of the attraction arising from the Weinberg-Tomozawa interaction in the chiral Lagrangian. Chiral corrections to order Qχ2 are calculated and found to be small. The Ds0*(2317) and Ds1*(2460) mesons decay either strongly into the isospin-violating π0Ds and π0Ds* channels or electromagnetically. We show that the π0-η and (K0D+-K+D0) mixings act constructively to generate strong widths of the order of 140 keV and emphasize the sensitivity of this value to the KD component of the states. The one-loop contribution to the radiative decay amplitudes of scalar and axial-vector states is calculated using the electromagnetic Lagrangian to chiral order Qχ2. We show the importance of taking into account processes involving light vector mesons explicitly in the dynamics of electromagnetic decays. The radiative width are sensitive to both ηDs and KD components, hence providing information complementary to the strong widths on the positive parity Ds-meson structure.

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