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Register a new userMeasurements of the branching fractions for $D^+to K^0_SK^0_SK^+$, $K^0_SK^0_Spi^+$ and $D^0to K^0_SK^0_S$, $K^0_SK^0_SK^0_S$
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By analyzing $2.93 rm fb^{-1}$ of data taken at the $psi(3770)$ resonance peak with the BESIII detector, we measure the branching fractions for the hadronic decays $D^+to K^0_SK^0_S K^+$, $D^+to K^0_SK^0_S pi^+$, $D^0to K^0_S K^0_S$ and $D^0to K^0_SK^0_SK^0_S$. They are determined to be ${mathcal B}(D^+to K^0_SK^0_SK^+)=(2.54 pm 0.05_{rm stat.} pm 0.12_{rm sys.})times 10^{-3}$, ${mathcal B}(D^+to K^0_SK^0_Spi^+)=(2.70 pm 0.05_{rm stat.} pm 0.12_{rm sys.})times 10^{-3}$, ${mathcal B}(D^0to K^0_SK^0_S)=(1.67 pm 0.11_{rm stat.} pm 0.11_{rm sys.})times 10^{-4}$ and ${mathcal B}(D^0to K^0_SK^0_SK^0_S)=(7.21 pm 0.33_{rm stat.} pm 0.44_{rm sys.})times 10^{-4}$, where the second one is measured for the first time and the others are measured with significantly improved precision over the previous measurements.
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Analyzing $(448.1pm2.9)times10^6$ $psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the $psi(3686)to omega K_{S}^{0}K_{S}^{0}$ decay is observed for the first time. The branching fraction for this decay is determined to be $mathcal{B}_{psi(3686)to omega K_{S}^{0}K^{0}_{S}}$=$(7.04pm0.39pm0.36)$$times10^{-5}$, where the first uncertainty is statistical and the second is systematic.
We report a study of the decay $D^0 to K^0_S K^0_S$ using 921~fb$^{-1}$ of data collected at or near the $Upsilon(4S)$ and $Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. The measured time-integrated $CP$ asymmetry is $ A_{CP}(D^0 to K^0_S K^0_S) = (-0.02 pm 1.53 pm 0.02 pm 0.17) %$, and the branching fraction is $mathcal{B} (D^{0}rightarrow K_{S}^{0}K_{S}^{0})$ = (1.321 $pm$ 0.023 $pm$ 0.036 $pm$ 0.044) $times$ 10$^{-4}$, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode ($D^0 to K_S^0 pi^0$). These results are significantly more precise than previous measurements available for this mode. The $A_{CP}$ measurement is consistent with the standard model expectation.
The first observation of the $B^0_stobar{D}^0 K^0_S$ decay mode and evidence for the $B^0_stobar{D}^{*0} K^0_S$ decay mode are reported. The data sample corresponds to an integrated luminosity of 3.0 $text{fb}^{-1}$ collected in $pp$ collisions by LHCb at center-of-mass energies of 7 and 8 TeV. The branching fractions are measured to be begin{align*} mathcal{B}(B^0_stobar{D}^0 bar{K}^0) &= (4.3pm0.5(text{stat})pm0.3(text{syst})pm0.3(text{frag})pm0.6(text{norm}))times10^{-4}, mathcal{B}(B^0_stobar{D}^{*0} bar{K}^0) &= (2.8pm1.0(text{stat})pm0.3(text{syst})pm0.2(text{frag})pm0.4(text{norm}))times10^{-4}, end{align*} where the uncertainties are due to contributions coming from statistical precision, systematic effects, and the precision of two external inputs, the ratio $f_s/f_d$ and the branching fraction of $B^0tobar{D}^0 K^0_S$, which is used as a calibration channel.
Amplitude models are applied to studies of resonance structure in $D^0to K^0_S K^- pi^+$ and $D^0to K^0_S K^+ pi^-$ decays using $pp$ collision data corresponding to an integrated luminosity of $3.0,mathrm{fb}^{-1}$ collected by the LHCb experiment. Relative magnitude and phase information is determined, and coherence factors and related observables are computed for both the whole phase space and a restricted region of $100,mathrm{MeV/}c^2$ around the $K^{*}(892)^{pm}$ resonance. Two formulations for the $Kpi$ $S$-wave are used, both of which give a good description of the data. The ratio of branching fractions $mathcal{B}(D^0to K^0_S K^+ pi^-)/mathcal{B}(D^0to K^0_S K^- pi^+)$ is measured to be $0.655pm0.004,(textrm{stat})pm0.006,(textrm{syst})$ over the full phase space and $0.370pm0.003, (textrm{stat})pm0.012,(textrm{syst})$ in the restricted region. A search for $CP$ violation is performed using the amplitude models and no significant effect is found. Predictions from $SU(3)$ flavor symmetry for $K^{*}(892)K$ amplitudes of different charges are compared with the amplitude model results.
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