Precise measurement of the <i>χ</i> <sub> <i>c</i>0</sub> resonance parameters and branching fractions of <i>χ</i> <sub> <i>c</i>0,<i>c</i>2</sub> → <i>π</i> <sup>+</sup> <i>π</i> <sup>−</sup>/<i>K</i> <sup>+</sup> <i>K</i> <sup>−</sup> *
Abstract By analyzing a data sample containing events taken with the BESIII detector at the BEPCII storage ring in 2009, the resonance parameters are precisely measured using events. The mass of is determined to be ) MeV/ , and its full width is , where the first uncertainty is statistical, the second systematic, and the third for mass comes from mass uncertainty. These measurements improve the precision of mass by a factor of four and width by one order of magnitude over the previous individual measurements, and significantly boost our knowledge about the charmonium spectrum. Together with additional data events taken in 2012, the decay branching fractions of are measured as well, with precision improved by a factor of three compared to previous measurements. These decay branching fractions provide important inputs for the study of glueballs.
Publication Details
- Journal
- Chinese Physics C
- Published
- 2025-06-30
- DOI
- https://doi.org/10.1088/1674-1137/ade95f
- Primary Topic
- Advanced NMR Techniques and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- U.S. Department of Energy
- Strong
- National Research Foundation
- Deutsche Forschungsgemeinschaft
- Swedish Foundation for International Cooperation in Research and Higher Education
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- China Postdoctoral Science Foundation
- National Research Foundation of Korea
- Knut och Alice Wallenbergs Stiftelse
- Vetenskapsrådet
- Natural Science Foundation of Shandong Province
- Istituto Nazionale di Fisica Nucleare
- CAS Center for Excellence in Particle Physics
- Shanghai Key Laboratory for Particle Physics and Cosmology
- Institute of High Energy Physics