Measurement of the mass differencem(Ds+)−m(D+)at CDF II

We present a measurement of the mass difference

{m (D}_{s}^{+}) - {m (D}^{+}),

where both the

D_{s}^{+}

and

D^{+}

are reconstructed in the

φ π^{+}

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 be

{m (D}_{s}^{+}) - {m (D}^{+}) = 99.41 \pm 0.38 (stat) \pm 0.21 (syst) MeV {/ c}^{2} .

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