Measurement of the direct CP-violating charge asymmetry in D_s^±→φπ^±

Luminosity: 10.4 fb-1

Paper

Fermilab-Pub-13-550-E

arXiv:/1312.0741 [hep-ex]

Phys. Rev. Lett. 112, 111804 (2014)

Figures
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Supplemental Figures
(animated gif)

The top figure in the animation is the invariant mass distribution of all D_s^± meson candidates, with a clear signal peak shown in red, together with a number of background processes. For the lower figure, each point is the difference between the number of positive (D_s⁺) and negative (D_s^-) candidates, for a set of ten simulations showing what a negative charge asymmetry of 1% would look like for the signal.