Abstract:
We present a measurement of the mass difference m(D+s)-m(D+), where
both the D+s and D+ are reconstructed in the phi pi + decay channel.
This measurement uses 11.6 pb-1 of data collected by CDF II using the
new displaced-track trigger. The mass difference is found to bem(D+s)-
m(D+)=99.41±0.38(stat)±0.21(syst) MeV/c2.
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