Measurement of the Mass Difference m(D_s^+) - m(D^+) at CDF II

TL;DR

This paper reports a precise measurement of the mass difference between D_s^+ and D^+ mesons using data from the CDF II detector, providing valuable input for understanding charm meson properties.

Contribution

The study introduces a new measurement of the D_s^+ - D^+ mass difference using the displaced-track trigger at CDF II, enhancing the precision of charm meson mass measurements.

Findings

Mass difference measured as 99.41 ± 0.38 (stat) ± 0.21 (syst) MeV/c^2.

Utilized 11.6 pb^-1 of data with the displaced-track trigger.

Improves the precision of charm meson mass difference measurements.

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 be: 99.41 +- 0.38 (stat) +- 0.21 (syst) MeV/c^2.