First determination of the CP content of D -> pi(+)pi(-)pi(+)pi(-) and updated determination of the CP contents of D -> pi(+)pi(-)pi(0) and D -> K+K-pi(0)

Journal article

Quantum-correlated ψ(3770)→DD decays collected by the CLEO-c experiment are used to perform a first measurement of F+^4π, the fractional CP-even content of the self-conjugate decay D→π⁺π^-π⁺π^-, obtaining a value of 0.737±0.028. An important input to the measurement comes from the use of D→KS⁰π+π- and D→KL⁰π+π- decays to tag the signal mode. This same technique is applied to the channels D→π⁺π^-π⁰ and D→K⁺K^-π⁰, yielding F+^πππ0=1.014±0.045±0.022 and F+^KKπ0=0.734±0.106±0.054, where the first uncertainty is statistical and the second systematic. These measurements are consistent with those of an earlier analysis, based on CP-eigenstate tags, and can be combined to give values of F+^πππ0=0.973±0.017 and F+^KKπ0=0.732±0.055. The results will enable the three modes to be included in a model-independent manner in measurements of the unitarity triangle angle γ using B^∓→DK^∓ decays, and in time-dependent studies of CP violation and mixing in the D⁰D⁰ system.

Authors: Malde, S; Thomas, C; Wilkinson, G; al., E

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Physics Letters B
• Volume: 747
• Pages: 9-17
• Publication date: 2015-07-30
• Acceptance date: 2015-05-17
• DOI: 10.1016/j.physletb.2015.05.043
• ISSN: 0370-2693
• Keywords: SBTMR