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We present the first measurements of absolute branching fractions of $Xi_c^0$ decays into $Xi^- pi^+$, $Lambda K^- pi^+$, and $p K^- K^- pi^+$ final states. The measurements are made using a data set comprising $(772pm 11)times 10^{6}$ $Bbar{B}$ pairs collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. We first measure the absolute branching fraction for $B^- to bar{Lambda}_c^- Xi_c^0$ using a missing-mass technique; the result is ${cal B}(B^- to bar{Lambda}_c^- Xi_c^0) = (9.51 pm 2.10 pm 0.88) times 10^{-4}$. We subsequently measure the product branching fractions ${cal B}(B^- to bar{Lambda}_c^- Xi_c^0){cal B}(Xi_c^0 to Xi^- pi^+)$, ${cal B}( B^- to bar{Lambda}_c^- Xi_c^0) {cal B}(Xi_c^0 to Lambda K^- pi^+)$, and ${cal B}( B^- to bar{Lambda}_c^- Xi_c^0) {cal B}(Xi_c^0 to p K^- K^- pi^+)$ with improved precision. Dividing these product branching fractions by the result for $B^- to bar{Lambda}_c^- Xi_c^0$ yields the following branching fractions: ${cal B}(Xi_c^0 to Xi^- pi^+)= (1.80 pm 0.50 pm 0.14)%$, ${cal B}(Xi_c^0 to Lambda K^- pi^+)=(1.17 pm 0.37 pm 0.09)%$, and ${cal B}(Xi_c^0 to p K^- K^- pi^+)=(0.58 pm 0.23 pm 0.05)%.$ For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for ${cal B}(Xi_c^0 to Xi^- pi^+)$ can be combined with $Xi_c^0$ branching fractions measured relative to $Xi_c^0 to Xi^- pi^+$ to yield other absolute $Xi_c^0$ branching fractions.
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We present the first measurements of the absolute branching fractions of $Xi_c^+$ decays into $Xi^- pi^+ pi^+$ and $p K^- pi^+$ final states. Our analysis is based on a data set of $(772pm 11)times 10^{6}$ $Bbar{B}$ pairs collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. We measure the absolute branching fraction of $bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$ with the $Xi_c^+$ recoiling against $bar{Lambda}_c^-$ in $bar{B}^0$ decays resulting in ${cal B}(bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}) = [1.16 pm 0.42(rm stat.) pm 0.15(rm syst.)] times 10^{-3}$. We then measure the product branching fractions ${cal B}(bar{B}^{0} to bar{Lambda}_c^- Xi_c^+){cal B}(Xi_c^+ to Xi^- pi^+ pi^+)$ and ${cal B}(bar{B}^{0} to bar{Lambda}_c^- Xi_c^+){cal B}(Xi_c^+ to p K^- pi^+)$. Dividing these product branching fractions by $bar{B}^{0} to bar{Lambda}_{c}^{-} Xi_{c}^{+}$ yields: ${cal B}(Xi_c^+ to Xi^- pi^+ pi^+) = [2.86 pm 1.21(rm stat.) pm 0.38(rm syst.)]%$ and ${cal B}(Xi_c^+ to p K^- pi^+)=[0.45 pm 0.21(rm stat.) pm 0.07(rm syst.)]%$. Our result for ${cal B}(Xi_c^+ to Xi^- pi^+ pi^+)$ can be combined with $Xi_c^+$ branching fractions measured relative to $Xi_c^+ to Xi^- pi^+ pi^+$ to set the absolute scale for many $Xi_c^+$ branching fractions.
We report measurements of the branching fractions of singly Cabibbo-suppressed decays $Lambda_c^+ to p eta$ and $Lambda_c^+ to p pi^0$ using the full Belle data sample corresponding to an integrated luminosity of 980.6 $rm fb^{-1}$. The data were collected by the Belle detector at the KEKB $e^{+}$$e^{-}$ asymmetric-energy collider. A clear $Lambda_c^+$ signal is seen in the invariant mass distribution of $p eta$. The signal yield of the $Lambda_c^+ to p eta$ process is $7734 pm 263$; from this, we measure the ratio of branching fractions ${cal B}(Lambda_c^+ to p eta)/{cal B}(Lambda_c^+ to p K^- pi^+) = (2.258 pm 0. 077(rm stat. ) pm 0.136(rm syst. ))times 10^{-2}$, from which we infer the branching fraction ${cal B}(Lambda_c^+ to p eta) = (1.42 pm 0.05(rm stat.) pm 0.11(rm syst.)) times 10^{-3}$. In addition, no significant signal for $Lambda_c^+ to p pi^0$ is found so an upper limit on the branching fraction of ${cal B}(Lambda_c^+ to p pi^0)<8.0 times 10^{-5}$ at 90% credibility level is set, more than three times better than the best current upper limit.
Based on 2.93~fb$^{-1}$ $e^+e^-$ collision data taken at center-of-mass energy of 3.773 GeV by the BESIII detector, we report the measurements of the absolute branching fractions of $D^0to K^+K^-pi^0pi^0$, $D^0to K^0_SK^0_Spi^+pi^-$, $D^0to K^0_SK^-pi^+pi^0$, $D^0to K^0_SK^+pi^-pi^0$, $D^+to K^+K^-pi^+pi^0$, $D^+to K^0_SK^+pi^0pi^0$, $D^+to K^0_SK^-pi^+pi^+$, $D^+to K^0_SK^+pi^+pi^-$, and $D^+to K^0_SK^0_Spi^+pi^0$. The decays $D^0to K^+K^-pi^0pi^0$, $D^0to K^0_SK^-pi^+pi^0$, $D^0to K^0_SK^+pi^-pi^0$, $D^+to K^0_SK^0_Spi^+pi^0$, and $D^+to K^0_SK^+pi^0pi^0$ are observed for the first time. The branching fractions of the decays $D^0to K^0_SK^0_Spi^+pi^-$, $D^+to K^+K^-pi^+pi^0$, $D^+to K^0_SK^-pi^+pi^+$, and $D^+to K^0_SK^+pi^+pi^-$ are measured with improved precision compared to the world-average values.
Using a data sample of 980 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we study the processes of $Xi^0_cto Lambdabar K^{*0}$, $Xi^0_cto Sigma^0bar K^{*0}$, and $Xi^0_cto Sigma^+K^{*-}$ for the first time. The relative branching ratios to the normalization mode of $Xi^0_ctoXi^-pi^+$ are measured to be $${cal B}(Xi^0_cto Lambdabar K^{*0})/{cal B}(xicto Xi^-pi^+)=0.18pm0.02({rm stat.})pm0.01({rm syst.}),$$ $${cal B}(Xi^0_cto Sigma^0bar K^{*0})/{cal B}(xicto Xi^-pi^+)=0.69pm0.03({rm stat.})pm0.03({rm syst.}),$$ $${cal B}(Xi^0_cto Sigma^+K^{*-})/{cal B}(xicto Xi^-pi^+)=0.34pm0.06({rm stat.})pm0.02({rm syst.}),$$ where the uncertainties are statistical and systematic, respectively. We obtain %measure the branching fractions of $Xi^0_cto Lambdabar K^{*0}$, $Xi^0_cto Sigma^0bar K^{*0}$, and $Xi^0_cto Sigma^+K^{*-}$ to be $${cal B}(Xi^0_cto Lambdabar K^{*0})=(3.3pm0.3({rm stat.})pm0.2({rm syst.})pm1.0({rm ref.}))times10^{-3},$$ $${cal B}(Xi^0_cto Sigma^0bar K^{*0})=(12.4pm0.5({rm stat.})pm0.5({rm syst.})pm3.6({rm ref.}))times10^{-3},$$ $${cal B}(Xi^0_cto Sigma^+K^{*-})=(6.1pm1.0({rm stat.})pm0.4({rm syst.})pm1.8({rm ref.}))times10^{-3},$$ where the uncertainties are statistical, systematic, and from ${cal B}(xic to Xi^-pi^+)$, respectively. The asymmetry parameters $alpha(Xi^0_cto Lambdabar K^{*0})$ and $alpha(Xi^0_cto Sigma^+K^{*-})$ are $0.15pm0.22({rm stat.})pm0.04({rm syst.})$ and $-0.52pm0.30({rm stat.})pm0.02({rm syst.})$, respectively, where the uncertainties are statistical followed by systematic.
By analyzing 2.93 fb$^{-1}$ of $e^+e^-$ annihilation data taken at the center-of-mass energy $sqrt s=$ 3.773 GeV with the BESIII detector, we determine the branching fractions of the inclusive decays $D^+tophi X$ and $D^0tophi X$ to be $(1.135pm0.034pm0.031)%$ and $(1.091pm0.027pm0.035)%$, respectively, where $X$ denotes any possible particle combination. The first uncertainties are statistical and the second systematic. We also determine the branching fractions of the decays $Dtophi X$ and their charge conjugate modes $bar{D}tophi bar{X}$ separately for the first time, and no significant CP asymmetry is observed.
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