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Gershon","submitted_at":"2015-04-22T16:50:25Z","abstract_excerpt":"Quantum-correlated $\\psi(3770) \\to D\\bar{D}$ decays collected by the CLEO-c experiment are used to perform a first measurement of $F_+^{4\\pi}$, the fractional $CP$-even content of the self-conjugate decay $D \\to \\pi^+\\pi^-\\pi^+\\pi^-$, obtaining a value of $0.737 \\pm 0.028$. An important input to the measurement comes from the use of $D \\to K^0_{\\rm S}\\pi^+\\pi^-$ and $D \\to K^0_{\\rm L}\\pi^+\\pi^-$ decays to tag the signal mode. 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Prouve, C. Thomas, G. Wilkinson, J. Libby, J. Rademacker, M. Nayak, P. Naik, R.A. Briere, S. Malde, T. Gershon","submitted_at":"2015-04-22T16:50:25Z","abstract_excerpt":"Quantum-correlated $\\psi(3770) \\to D\\bar{D}$ decays collected by the CLEO-c experiment are used to perform a first measurement of $F_+^{4\\pi}$, the fractional $CP$-even content of the self-conjugate decay $D \\to \\pi^+\\pi^-\\pi^+\\pi^-$, obtaining a value of $0.737 \\pm 0.028$. An important input to the measurement comes from the use of $D \\to K^0_{\\rm S}\\pi^+\\pi^-$ and $D \\to K^0_{\\rm L}\\pi^+\\pi^-$ decays to tag the signal mode. 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