Measurement of CP asymmetries in D ± → η ′ π ± and D ± s → η ′ π ± decays

Article history: Received 9 January 2017 Received in revised form 6 April 2017 Accepted 4 May 2017 Available online 12 May 2017 Editor: L. Rolandi A search for CP violation in D± → η′π± and D±s → η′π± decays is performed using proton–proton collision data, corresponding to an integrated luminosity of 3 fb−1, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The measured CP-violating charge asymmetries are ACP(D± → η′π±) = (−0.61 ± 0.72 ± 0.53 ± 0.12)% and ACP(D±s → η′π±) = (−0.82 ± 0.36 ± 0.22 ± 0.27)%, where the first uncertainties are statistical, the second systematic, and the third are the uncertainties on the ACP(D± → K 0 S π±) and ACP(D±s → φπ±) measurements used for calibration. The results represent the most precise measurements of these asymmetries to date. © 2017 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.