Measurement of CP asymmetry in D0 → KK+ decays

The LHCb collaboration

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A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→KK+ is performed using pp collision data, corresponding to an integrated luminosity of 3 fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in D⁎+→D0π+ and D⁎−→D‾0π decays. The time-integrated CP asymmetry ACP(KK+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→Kπ+, D+→Kπ+π+ and D+→K‾0π+ decays used as calibration channels. It is found to be ACP(KK+)=(0.14±0.15 (stat)±0.10 (syst))%. A combination of this result with previous LHCb measurements yields ACP(KK+)=(0.04±0.12 (stat)±0.10 (syst))%,ACPπ+)=(0.07±0.14 (stat)±0.11 (syst))%. These are the most precise measurements from a single experiment. The result for ACP(KK+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

Idioma originalAnglès
Pàgines (de-a)177-187
Nombre de pàgines11
RevistaPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Estat de la publicacióPublicada - 10 d’abr. 2017


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