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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>
Measurement of the ratio of branching fractionsB(B0→K*0γ)/B(Bs0→ϕγ)
Aaij, R.,Abellan Beteta, C.,Adeva, B.,Adinolfi, M.,Adrover, C.,Affolder, A.,Ajaltouni, Z.,Albrecht, J.,Alessio, F.,Alexander, M.,Alkhazov, G.,Alvarez Cartelle, P.,Alves, A. A.,Amato, S.,Amhis, Y.,Ande American Physical Society 2012 PHYSICAL REVIEW D - Vol.85 No.11
LHCb Collaboration,Aaij, R.,Abellan Beteta, C.,Adeva, B.,Adinolfi, M.,Adrover, C.,Affolder, A.,Ajaltouni, Z.,Albrecht, J.,Alessio, F.,Alexander, M.,Alkhazov, G.,Alvarez Cartelle, P.,Alves, A.A.,Amato, North-Holland Pub. Co 2011 Physics letters: B Vol.706 No.1
The first observation of the decay B@?<SUB>s</SUB><SUP>0</SUP>→D<SUP>0</SUP>K<SUP>@?0</SUP> using pp data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb<SUP>-1</SUP>, is reported. A signal of 34.4+/-6.8 events is obtained and the absence of signal is rejected with a statistical significance of more than nine standard deviations. The B@?<SUB>s</SUB><SUP>0</SUP>→D<SUP>0</SUP>K<SUP>@?0</SUP> branching fraction is measured relative to that of B@?<SUP>0</SUP>→D<SUP>0</SUP>ρ<SUP>0</SUP>: B(B@?<SUB>s</SUB><SUP>0</SUP>→D<SUP>0</SUP>K<SUP>@?0</SUP>)B(B@?<SUP>0</SUP>→D<SUP>0</SUP>ρ<SUP>0</SUP>)=1.48+/-0.34+/-0.15+/-0.12, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ratio of the B<SUP>0</SUP> and B<SUB>s</SUB><SUP>0</SUP> hadronisation fractions.