Regular Article - Theoretical Physics
The scalar , , and resonances and vector mesons in the single Cabibbo-suppressed decays and
School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
2 School of Materials Science and Engineering, Zhengzhou University of Aeronautics, 450001, Henan, China
3 Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
4 School of Nuclear Sciences and Technology, University of Chinese Academy of Sciences, 101408, Beijing, China
Accepted: 13 August 2020
Published online: 11 September 2020
In the chiral unitary approach, we have studied the single Cabibbo-suppressed decays and by taking into account the s-wave meson–meson interaction as well as the contributions from the intermediate vectors and . Our theoretical results for the ratios of the branching fractions of and with respect to the one of are in agreement with the experimental data. Within the picture that the scalar resonances , , and are dynamically generated from the pseudoscalar-pseudoscalar interactions in s-wave, we have calculated the and invariant mass distributions respectively for the decays and . One can find a broad bump structure for the and a narrow peak for the in the invariant mass distribution of the decay . For the invariant mass distribution, in addition to the narrow peak for the meson, there is an enhancement structure near the threshold mainly due to the contribution from the . Both the and invariant mass distributions are compatible with the BESIII measurement. We encourage our experimental colleagues to measure these two decays, which would be helpful to understand the nature of the , , and .
© The Author(s) 2020
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