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Aaij, R.,Adeva, B.,Adinolfi, M.,Ajaltouni, Z.,Akar, S.,Albrecht, J.,Alessio, F.,Alexander, M.,Ali, S.,Alkhazov, G.,Alvarez Cartelle, P.,Alves Jr, A.A.,Amato Jr, S.,Amerio Jr, S.,Amhis Jr, Y.,An Jr, L. Elsevier 2017 Physics letters: B Vol.771 No.-
<P><B>Abstract</B></P> <P>A search for <I>CP</I> violation in <SUP> D ± </SUP> → <SUP> η ′ </SUP> <SUP> π ± </SUP> and D s ± → <SUP> η ′ </SUP> <SUP> π ± </SUP> decays is performed using proton–proton collision data, corresponding to an integrated luminosity of 3 <SUP> fb − 1 </SUP> , recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The measured <I>CP</I>-violating charge asymmetries are <SUB> A CP </SUB> ( <SUP> D ± </SUP> → <SUP> η ′ </SUP> <SUP> π ± </SUP> ) = ( − 0.61 ± 0.72 ± 0.53 ± 0.12 ) % and <SUB> A CP </SUB> ( D s ± → <SUP> η ′ </SUP> <SUP> π ± </SUP> ) = ( − 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 <SUB> A CP </SUB> ( <SUP> D ± </SUP> → K S 0 <SUP> π ± </SUP> ) and <SUB> A CP </SUB> ( D s ± → ϕ <SUP> π ± </SUP> ) measurements used for calibration. The results represent the most precise measurements of these asymmetries to date.</P>