Precision Measurement of $D_s^{\ast +}$-$D_s^{+}$ Mass Difference

BESIII Collaboration, M. Ablikim, M. N. Achasov +684

The paper reports a precise measurement of the mass difference between the charm-strange mesons D_s*+ and D_s+ using e⁺e⁻ collision data collected by the BESIII detector.