CP asymmetry references used by the Charm Subgroup

NOTE: In the case of D+ and Ds+ decays, the CP asymmetry measures direct CP violation; in the case of D0 decays the CP asymmetry measures direct and indirect CP violation combined.

CP asymmetries in D0 decay modes

Year Experiment CP Asymmetry in the decay mode D0 to π+π- [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2012 CDF T.Aaltonen et al. (CDF Collab.), Phys. Rev. D 85, 012009 (2012). +0.0022 ± 0.0024 ± 0.0011
2008 BELLE M. Staric et al. (BELLE Collab.), Phys. Lett. B 670, 190 2008). +0.0043 ± 0.0052 ± 0.0012
2008 BABAR B. Aubert et al. (BABAR Collab.), Phys. Rev. Lett. 100, 061803 (2008). -0.0024 ± 0.0052 ± 0.0022
2002 CLEO S.E. Csorna et al. (CLEO Collab.), Phys. Rev. D 65, 092001 (2002). +0.019 ± 0.032 ± 0.008
2000 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Lett. B 491, 232 (2000). +0.048 ± 0.039 ± 0.025
1998 E791 E.M. Aitala et al. (E791 Collab.), Phys. Lett. B 421, 405 (1998). -0.049 ± 0.078 ± 0.030
. . COMBOS average +0.0020 ± 0.0022
Year Experiment CP Asymmetry in the decay mode D0 to π0π0 [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2001 CLEO G. Bonvicini et al. (CLEO Collab.), Phys. Rev. D 63, 071101 (2001). +0.001 ± 0.048
Year Experiment CP Asymmetry in the decay mode D0 to K0sπ0 [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2011 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 106, 211801 (2011). -0.0028 ± 0.0019 ± 0.0010
2001 CLEO G. Bonvicini et al. (CLEO Collab.), Phys. Rev. D 63, 071101 (2001). +0.001 ± 0.013
. . COMBOS average -0.0027 ± 0.0021
Year Experiment CP Asymmetry in the decay mode D0 to K0s&eta [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2011 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 106, 211801 (2011). +0.0054 ± 0.0051 ± 0.0016
Year Experiment CP Asymmetry in the decay mode D0 to K0sη' [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2011 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 106, 211801 (2011). +0.0098 ± 0.0067 ± 0.0014
Year Experiment CP Asymmetry in the decay mode D0 to K0sK0s [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2001 CLEO G. Bonvicini et al. (CLEO Collab.), Phys. Rev. D 63, 071101 (2001). -0.23 ± 0.19
Year Experiment CP Asymmetry in the decay mode D0 to K+K- [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2012 CDF T.Aaltonen et al. (CDF Collab.), Phys. Rev. D 85, 012009 (2012). -0.0024 ± 0.0022 ± 0.0009
2008 BELLE M. Staric et al. (BELLE Collab.), Phys. Lett. B 670, 190 (2008). -0.0043 ± 0.0030 ± 0.0011
2008 BABAR B. Aubert et al. (BABAR Collab.), Phys. Rev. Lett. 100, 061803 (2008). +0.0000 ± 0.0034 ± 0.0013
2002 CLEO S.E. Csorna et al. (CLEO Collab.), Phys. Rev. D 65, 092001 (2002). +0.000 ± 0.022 ± 0.008
2000 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Lett. B 491, 232 (2000). -0.001 ± 0.022 ± 0.015
1998 E791 E.M. Aitala et al. (E791 Collab.), Phys. Lett. B 421, 405 (1998). -0.010 ± 0.049 ± 0.012
1995 CLEO J.E. Bartelt et al. (CLEO Collab.), Phys. Rev. D 52, 4860 (1995). +0.080 ± 0.061
1994 E687 P.L. Frabetti et al. (E687 Collab.), Phys. Rev. D 50, 2953 (1994). +0.024 ± 0.084
. . COMBOS average -0.0023 ± 0.0017
Year Experiment CP Asymmetry in the decay mode D0 to π+π-π0 [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2008 BABAR B. Aubert et al. (BABAR Collab.), Phys. Rev. D 78, 051102 (2008). -0.0031 ± 0.0041 ± 0.0017
2008 BELLE K. Arinstein et al. (BELLE Collab.), Phys. Lett. B 662, 102 (2008). +0.0043 ± 0.0130
2005 CLEO D. Cronin-Hennessy et al. (CLEO Collab.), Phys. Rev. D 72, 031102 (2005). +0.01 (+0.09 -0.07) ± 0.05
. . COMBOS average -0.0023 ± 0.0042
Year Experiment CP Asymmetry in the decay mode D0 to K-π+π0 [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2007 CLEO-c S. Dobbs et al. (CLEO Collab.), Phys. Rev. D 76, 112001 (2007). +0.002 ± 0.004 ± 0.008
2001 CLEO S. Kopp et al. (CLEO Collab.), Phys. Rev. D 63, 092001 (2001). -0.031 ± 0.086
. . COMBOS average +0.0016 ± 0.0089
Year Experiment CP Asymmetry in the decay mode D0 to K+π-π0 [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2005 BELLE X.C. Tian et al. (BELLE Collab.), Phys. Rev. Lett. 95, 231801 (2005). -0.006 ± 0.053
2001 CLEO G. Brandenburg et al. (CLEO Collab.), Phys. Rev. Lett. 87, 071802 (2001). +0.09 (+0.25 -0.22)
. . COMBOS average -0.0014 ± 0.0517
Year Experiment CP Asymmetry in the decay mode D0 to K0sπ+π- [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2004 CLEO D.M. Asner et al. (CLEO Collab.), Phys. Rev. D 70, 091101 (2004). -0.009 ± 0.021 (+0.016 -0.057)
Year Experiment CP Asymmetry in the decay mode D0 to K-K+π0 [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2008 BABAR B. Aubert et al. (BABAR Collab.), Phys. Rev. D 78, 051102 (2008). +0.0100 ± 0.0167 ± 0.0025
Year Experiment CP Asymmetry in the decay mode D0 to K+π-π+π- [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2005 BELLE X.C. Tian et al. (BELLE Collab.), Phys. Rev. Lett. 95, 231801 (2005). -0.018 ± 0.044
Year Experiment CP Asymmetry in the decay mode D0 to K+K-π+π- [Γ(D0)-Γ(D0bar)]/[Γ(D0)+Γ(D0bar)]
2005 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Lett. B 622, 239 (2005). -0.082 ± 0.056 ± 0.047

Combination of Direct and Indirect CP Violation in D0 decay modes
see link Results for A_Γ and ΔA_CP for more details.

CP LIFETIME asymmetries in D0 decay modes
see link Results for D0-D0bar Mixing (allowing for CP violation) for more details.

Year Experiment CP Lifetime asymmetry in the decay modes D0 to K+K- and π+π- [τ(D0bar)-τ(D0)]/[τ(D0bar)+τ(D0)]
2008 BABAR B. Aubert et al. (BABAR Collab.), Phys. Rev. D 78, 011105 (2008). +0.00260 ± 0.00360 ± 0.00080
2007 BELLE M. Staric et al. (BELLE Collab.), Phys. Rev. Lett. 98, 211803 (2007). +0.00010 ± 0.00300 ± 0.00150
. . COMBOS average +0.00123 ± 0.00248

CP asymmetries in D+ decay modes

Year Experiment CP Asymmetry in the decay mode D+ to μ+ν [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2008 CLEO-c B.I. Eisenstein et al. (CLEO Collab.), Phys. Rev. D 78, 052003 (2008). +0.08 ± 0.08
Year Experiment CP Asymmetry in the decay mode D+ to π+π0 [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). +0.029 ± 0.029 ± 0.003
Year Experiment CP Asymmetry in the decay mode D+ to π+η [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.020 ± 0.023 ± 0.003
Year Experiment CP Asymmetry in the decay mode D+ to π+η' [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.040 ± 0.034 ± 0.003
Year Experiment CP Asymmetry in the decay mode D+ to K+π0 [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.035 ± 0.107 ± 0.009
Year Experiment CP Asymmetry in the decay mode D+ to K0sπ+ [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2011 BABAR P. del Amo Sanchez et al. (BABAR Collab.), Phys. Rev. D 83, 071103 (2011). -0.0044 ± 0.0013 ± 0.0010
2010 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 104, 181602 (2010). -0.0071 ± 0.0019 ± 0.0020
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.013 ± 0.007 ± 0.003
2002 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Rev. Lett. 88, 041602 (2002). -0.016 ± 0.015 ± 0.009
. . COMBOS average -0.0054 ± 0.0014
Year Experiment CP Asymmetry in the decay mode D+ to K0sK+ [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2010 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 104, 181602 (2010). -0.0016 ± 0.0058 ± 0.0025
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.002 ± 0.015 ± 0.009
2002 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Rev. Lett. 88, 041602 (2002). +0.071 ± 0.061 ± 0.012
. . COMBOS average -0.0010 ± 0.0059
Year Experiment CP Asymmetry in the decay mode D+ to π+π-π+ [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
1997 E791 E.M. Aitala et al. (E791 Collab.), Phys. Lett. B 403, 377 (1997). -0.017 ± 0.042
Year Experiment CP Asymmetry in the decay mode D+ to K-π+π+ [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.001 ± 0.004 ± 0.009
Year Experiment CP Asymmetry in the decay mode D+ to K0sπ+π0 [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2007 CLEO-c S. Dobbs et al. (CLEO Collab.), Phys. Rev. D 76, 112001 (2007). +0.003 ± 0.009 ± 0.003
Year Experiment CP Asymmetry in the decay mode D+ to K+K-π+ [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2008 CLEO-c P. Rubin et al. (CLEO Collab.), Phys. Rev. D 78, 072003 (2008). -0.0003 ± 0.0084 ± 0.0029
2005 BABAR B. Aubert et al. (BABAR Collab.), Phys. Rev. D71, 091101 (2005). +0.014 ± 0.010 ± 0.008
2000 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Lett. B 491, 232 (2000). +0.006 ± 0.011 ± 0.005
1997 E791 E.M. Aitala et al. (E791 Collab.), Phys. Lett. B 403, 377 (1997). -0.014 ± 0.029
1994 E687 P.L. Frabetti et al. (E687 Collab.), Phys. Rev. D 50, 2953 (1994). -0.031 ± 0.068
. . COMBOS average +0.0039 ± 0.0061
Year Experiment CP Asymmetry in the decay mode D+ to K-π+π+π0 [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2007 CLEO-c S. Dobbs et al. (CLEO Collab.), Phys. Rev. D 76, 112001 (2007). +0.010 ± 0.009 ± 0.009
Year Experiment CP Asymmetry in the decay mode D+ to K0sπ+π+π- [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2007 CLEO-c S. Dobbs et al. (CLEO Collab.), Phys. Rev. D 76, 112001 (2007). +0.001 ± 0.011 ± 0.006
Year Experiment CP Asymmetry in the decay mode D+ to K0sK+π+π- [Γ(D+)-Γ(D-)]/[Γ(D+)+Γ(D-)]
2005 FOCUS J.M. Link et al. (FOCUS Collab.), Phys. Lett. B 622, 239 (2005). -0.042 ± 0.064 ± 0.022

CP asymmetries in Ds decay modes

Year Experiment CP Asymmetry in the decay mode Ds+ to μ+ν [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2009 CLEO-c J.P. Alexander et al. (CLEO Collab.), Phys. Rev. D 79, 052001 (2009). +0.048 ± 0.061
Year Experiment CP Asymmetry in the decay mode Ds+ to π+η [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.046 ± 0.029 ± 0.003
Year Experiment CP Asymmetry in the decay mode Ds+ to π+η' [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). -0.061 ± 0.030 ± 0.003
Year Experiment CP Asymmetry in the decay mode Ds+ to K0sπ+ [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 104, 181602 (2010). +0.0545 ± 0.0250 ± 0.0033
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). +0.163 ± 0.073 ± 0.003
. . COMBOS average +0.066 ± 0.024
Year Experiment CP Asymmetry in the decay mode Ds+ to K+π0 [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). +0.266 ± 0.228 ± 0.009
Year Experiment CP Asymmetry in the decay mode Ds+ to K+η [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). +0.093 ± 0.152 ± 0.009
Year Experiment CP Asymmetry in the decay mode Ds+ to K+η' [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). +0.060 ± 0.189 ± 0.009
Year Experiment CP Asymmetry in the decay mode Ds+ to K+K0s [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2010 BELLE B.R. Ko et al. (BELLE Collab.), Phys. Rev. Lett. 104, 181602 (2010). +0.0012 ± 0.0036 ± 0.0022
2010 CLEO-c H. Mendez et al. (CLEO Collab.), Phys. Rev. D 81, 052013 (2010). +0.047 ± 0.018 ± 0.009
. . COMBOS average +0.0031 ± 0.0041
Year Experiment CP Asymmetry in the decay mode Ds+ to π+π+π- [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2008 CLEO-c J.P. Alexander et al. (CLEO Collab.), Phys. Rev. Lett. 100, 161804 (2008). +0.020 ± 0.046 ± 0.007
Year Experiment CP Asymmetry in the decay mode Ds+ to K+π+π- [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2008 CLEO-c J.P. Alexander et al. (CLEO Collab.), Phys. Rev. Lett. 100, 161804 (2008). +0.112 ± 0.070 ± 0.009
Year Experiment CP Asymmetry in the decay mode Ds+ to K+K-π+ [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2008 CLEO-c J.P. Alexander et al. (CLEO Collab.), Phys. Rev. Lett. 100, 161804 (2008). +0.003 ± 0.011 ± 0.008
Year Experiment CP Asymmetry in the decay mode Ds+ to K0sK-π+π+ [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2008 CLEO-c J.P. Alexander et al. (CLEO Collab.), Phys. Rev. Lett. 100, 161804 (2008). -0.007 ± 0.036 ± 0.011
Year Experiment CP Asymmetry in the decay mode Ds+ to K+K-π+π0 [Γ(Ds+)-Γ(Ds-)]/[Γ(Ds+)+Γ(Ds-)]
2008 CLEO-c J.P. Alexander et al. (CLEO Collab.), Phys. Rev. Lett. 100, 161804 (2008). -0.059 ± 0.042 ± 0.012

Last modified 14 February 2012. Send comments to D. Pedrini