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Measurement of the mass difference<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>m</mml:mi><mml:mo>(</mml:mo><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow><mml:mo>)</mml:mo><mml:mi>−</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>m</mml:mi><mml:mo>(</mml:mo><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:…
We present a measurement of the mass difference m(Ds+)−m(D+), where both the Ds+ and D+ are reconstructed in the φπ+ 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(Ds+)−m(D+)=99.41±0.38(stat)±0.21(syst)MeV/c2. Received 19 March 2003DOI:https://doi.org/10.1103/PhysRevD.68.072004©2003 …