2020/11/30 by Y. C. Xu, Yong-Jiang Xu, Yong-Lu Liu +2
Mathematics · Physics and Astronomy · #Combinatorics #Crystallography #High-Energy Particle Collisions Research #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.104.094028
published as Phys. Rev. D 104, 094028 (2021) · 25 pages, 4 figures, published version
openalex publication_date 2021/11/18 · arxiv created 2021/11/21 · openalex created_date 2021/11/22 · arxiv updated 2021/11/23 · openalex updated_date 2026/08/05
In this paper, we construct Ds(*)D(*)-molecule-type interpolating currents J_(\ifmmode±\else\textpm\fi)\ensuremathμ(x) with JP=1+, calculate the corresponding mass and magnetic moment using the QCD sum rule method and its extension in the weak electromagnetic field, and study the processes of Z_(\ifmmode±\else\textpm\fi)cs to \ensuremathηcK*, J/\ensuremathψK, DDs*, and D*Ds via three-point sum rules. The numerical values are m_Z_(\ifmmode±\else\textpm\fi)cs=3.99_\ensuremath-0.14+0.17 GeV, \ensuremathλ_Z_(\ifmmode±\else\textpm\fi)cs=2.07_\ensuremath-0.16+0.28\ifmmode×\else\texttimes\fi10^\ensuremath-2 GeV5, and \ensuremathμ_Z_(\ifmmode±\else\textpm\fi)cs=0.18_\ensuremath-0.09+0.16 \ensuremathμN with \ensuremathμN the nucleon magneton, \mathrm\ensuremathΓ_Z(+)cs=17.47_\ensuremath-8.08+12.70, and \mathrm\ensuremathΓ_Z_(\ensuremath-)cs=13.86_\ensuremath-6.51+10.37. The masses are in agreement with the recently measured value of Zcs(3985) by the BESIII Collaboration, m_Zcsexp=(3982.5_\ensuremath-2.6+1.8\ifmmode±\else\textpm\fi2.1) MeV. The widths are compatible with the experimental value \mathrm\ensuremathΓ_Zcsexp=\phantom\rule0ex0ex(12.8_\ensuremath-4.4+5.3\ifmmode±\else\textpm\fi3.0) MeV. The magnetic moment and the various decay modes can help us to determine the inner structure of Zcs(3985) when being confronted with experimental data in the future.