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Regular version of the site

Article

Measurement of the Charm-Mixing Parameter yCP

Physical Review Letters. 2019. Vol. 122. No. 1. P. 1-10.
Derkach D., Hushchyn M., Kazeev N., Ratnikov F., Arzymatov K., Borisyak M. A., Chekalina V., Ustyuzhanin A.

A measurement of the charm-mixing parameter yCP using D0 → KþK−, D0 → πþπ−, and D0 → K−πþ decays is reported. The D0 mesons are required to originate from semimuonic decays of B− and B0 mesons. These decays are partially reconstructed in a data set of proton-proton collisions at center-of-mass energies of 7 and 8 TeV collected with the LHCb experiment and corresponding to an integrated luminosity of 3 fb−1. The yCP parameter is measured to be ð0.57 0.13ðstatÞ 0.09ðsystÞÞ%, in agreement with, and as precise as, the current world-average value.