Dn. Brown et al., PRECISION-MEASUREMENT OF THE D(S)ASTERISK+ D(S)+ MASS DIFFERENCE, Physical review. D. Particles and fields, 50(3), 1994, pp. 1884-1891
We have measured the vector-pseudoscalar mass splitting M(D(s)+) - M(
D(s)+) = 144.22 +/- 0.47 +/- 0.37 MeV significantly more precisely tha
n the previous world average. We minimize the systematic errors by als
o measuring the vector-pseudoscalar mass difference M(D0) - M(D0) usi
ng the radiative decay D0 --> D0gamma, obtaining [M(D(s)*+) - M(D(s))] - [M(D0) - M(D0)] = 2.09 +/- 0.47 +/- 0.37 MeV. This is then combi
ned with our previous high-precision measurement of M(D0) - M(D0), wh
ich used the decay D0 --> D0pi0. We also measure the mass difference
M(D(s)+) - M(D+) = 99.5 +/- 0.6 +/- 0.3 MeV, using the phipi+ decay mo
des of the D(s)+ and D+ mesons.