BESIII Collaboration Reports No Significant Signals in Search for C-even States

A recent paper titled "Search for C-even states decaying to D_s^±D_s^∓ with masses between 4.08 and 4.32 GeV/c²" by the BESIII Collaboration, including M. Ablikim and over 660 co-authors, presents findings from an experimental search for specific particle states. The research utilized data from the BESIII detector at the BEPCII storage ring, focusing on the process e⁺e⁻ → γD_s^±D_s∓.

The study aimed to identify six C-even states, denoted as X, characterized by quantum numbers J^PC = 0⁻⁺, 1^±+, or 2^±+. The analysis was conducted using approximately 1667.39 ± 8.84 pb⁻¹ of collision data collected at a center-of-mass energy of 4681.92 ± 0.30 MeV.

However, the researchers reported that no statistically significant signals were detected in the mass range from 4.08 to 4.32 GeV/c². Consequently, they established upper limits for the product of the cross-section and branching fraction, σ[e⁺e⁻ → γX] · B[X → D_s^±D_s^*∓], at a 90% confidence level. These findings contribute to the understanding of particle interactions and the search for new states in high-energy physics.

The full paper can be accessed via arXiv: 2404.02033.