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Register a new userSearch for $CP$ violation in the $D^{+}topi^{+}pi^{0}$ decay at Belle
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We search for $CP$ violation in the charged charm meson decay $D^{+}topi^{+}pi^{0}$, based on a data sample corresponding to an integrated luminosity of $rm 921~fb^{-1}$ collected by the Belle experiment at the KEKB $e^{+}e^{-}$ asymmetric-energy collider. The measured $CP$ violating asymmetry is $[+2.31pm1.24({rm stat})pm0.23({rm syst})]%$, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.
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We measure the branching fractions and $CP$ asymmetries for the singly Cabibbo-suppressed decays $D^{0}topi^{+}pi^{-}eta$, $D^{0}to K^{+}K^{-}eta$, and $D^{0}tophieta$, using 980 fb$^{-1}$ of data from the Belle experiment at the KEKB $e^+e^-$ collider. We obtain begin{eqnarray} mathcal{B}(D^{0}topi^{+}pi^{-}eta) & = & [1.22pm 0.02,({rm stat})pm 0.02,({rm syst})pm 0.03,(mathcal{B}_{rm ref})]times 10^{-3},, onumber mathcal{B}(D^{0}to K^{+}K^{-}eta) & = & [1.80,^{+0.07}_{-0.06},({rm stat})pm 0.04,({rm syst})pm 0.05,(mathcal{B}_{rm ref})]times 10^{-4},, onumber mathcal{B}(D^{0}tophieta) & = & [1.84pm 0.09,({rm stat})pm 0.06,({rm syst})pm 0.05,(mathcal{B}_{rm ref})]times 10^{-4},, onumber end{eqnarray} where the third uncertainty ($mathcal{B}_{rm ref}$) is from the uncertainty in the branching fraction of the reference mode $D^{0}to K^{-}pi^{+}eta$. The color-suppressed decay $D^{0}tophieta$ is observed for the first time, with very high significance. The results for the $CP$ asymmetries are begin{eqnarray} A_{CP}(D^{0}topi^{+}pi^{-}eta) & = & [0.9pm 1.2,({rm stat})pm 0.5,({rm syst})]%,, onumber A_{CP}(D^{0}to K^{+}K^{-}eta) & = & [-1.4pm 3.3,({rm stat})pm 1.1,({rm syst})]%,, onumber A_{CP}(D^{0}tophieta)&= & [-1.9pm 4.4,({rm stat})pm 0.6,({rm syst})]%,. onumber end{eqnarray} The results for $D^{0}topi^{+}pi^{-}eta$ are a significant improvement over previous results. The branching fraction and $A_{CP}$ results for $D^{0}to K^{+}K^{-}eta$, and the $A_{CP}$ result for $D^{0}tophieta$, are the first such measurements. No evidence for $CP$ violation is found in any of these decays.
We search for CP violation in neutral charm meson decays using a data sample with an integrated luminosity of 966 fb^-1 collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. The asymmetry obtained in the rate of D^0 and D^0-bar decays to the pi^0 pi^0 final state, [-0.03+-0.64(stat)+-0.10(syst)]%, is consistent with no CP violation. This constitutes an order of magnitude improvement over the existing result. We also present an updated measurement of the CP asymmetry in the D^0 -> K_S pi^0 decay: A_{CP}(D^0 -> K_S pi^0) = [-0.21+-0.16(stat)+-0.07(syst)]%.
A search for CP violation in the phase space of the decay $D^+topi^-pi^+pi^+$ is reported using $pp$ collision data, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. The Dalitz plot distributions for $3.1times 10^6$ $D^+$ and $D^-$ candidates are compared with binned and unbinned model-independent techniques. No evidence for CP violation is found.
We search for $CP$ violation in the singly-Cabibbo-suppressed decay $D^{0}rightarrow K^{+}K^{-}pi^{+}pi^{-}$ using data corresponding to an integrated luminosity of $988text{ }{rm fb}^{-1}$ collected by the Belle detector at the KEKB $e^{+}e^{-}$ collider. We measure a set of five kinematically dependent $CP$ asymmetries, of which four asymmetries are measured for the first time. The set of asymmetry measurements can be sensitive to $CP$ violation via interference between the different partial-wave contributions to the decay and performed on other pseudoscalar decays. We find no evidence of $CP$ violation.
A search for time-integrated CP violation in the Cabibbo-suppressed decay $D^0topi^-pi^+pi^0$ is performed using for the first time an unbinned model-independent technique known as the energy test. Using proton-proton collision data, corresponding to an integrated luminosity of 2.0 fb$^{-1}$ collected by the LHCb detector at a centre-of-mass energy of $sqrt{s}$ = 8 TeV, the worlds best sensitivity to CP violation in this decay is obtained. The data are found to be consistent with the hypothesis of CP symmetry with a p-value of (2.6 +/- 0.5)%.
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