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Register a new userSearch for the weak decay $eta^{prime}to K^{pm}pi^{mp}$ and precise measurement of the branching fraction ${cal B}(J/psitophieta^{prime})$
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We present the first search for the rare decay of $eta^prime$ into $K^{pm}pi^{mp}$ in $J/psitophieta^{prime}$, using a sample of $1.3times10^{9}$ $J/psi$ events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90% confidence level for the ratio $frac{{cal B}(eta^{prime}to K^{pm}pi^{mp})}{{cal B}(eta^{prime}togammapi^{+}pi^{-})}$ is determined to be $1.3times10^{-4}$. In addition, we report the measurement of the branching fraction of $J/psitophieta^{prime}$ to be $(5.10pm0.03(text{stat.})pm0.32(text{syst.}))times10^{-4}$, which agrees with previous results from BESII.
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We have measured several branching ratios for $psi^prime$ decay using the data collected by FNAL E835 experiment during year 2000, obtaining ${cal B}(psi^prime to e^+ e^-) = 0.0068pm0.0001pm0.0004$, ${cal B}(psi^prime to J/psi pi^+ pi^-) = 0.292pm0.005pm0.018$, ${cal B}(psi^prime to J/psi pi^0 pi^0) = 0.167pm0.005pm0.014$ and ${cal B}(psi^prime to J/psi eta) = 0.028pm0.002pm0.002$. We also present a measurement of the dipion mass distribution in the decays $psi^prime to J/psi pi pi$.
We report a measurement of the branching fraction and final-state asymmetry for the $bar{B}^{0}to K^{0}_{S}K^{mp}pi^{pm}$ decays. The analysis is based on a data sample of 711 $rm{fb}^{-1}$ collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We obtain a branching fraction of $(3.60pm0.33pm0.15)times10^{-6}$ and a final-state asymmetry of $(-8.5pm8.9pm0.2)%$, where the first uncertainties are statistical and the second are systematic. Hints of peaking structures are seen in the differential branching fractions measured as functions of Dalitz variables.
The first observation of the $B^0_s to D_s^{*mp} K^{pm}$ decay is reported using 3.0$fb^{-1}$ of proton-proton collision data collected by the LHCb experiment. The $D_s^{*mp}$ mesons are reconstructed through the decay chain $D_s^{*mp} to gamma D_s^{mp}(K^{mp}K^{pm}pi^{mp})$. The branching fraction relative to that for $B^0_s to D_s^{*-} pi^{+}$ is measured to be $0.068 pm 0.005 ^{+0.003}_{-0.002}$, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of $BR(B^0_s to D_s^{*-} pi^{+})$ the absolute branching fraction of $B^0_s to D_s^{*mp} K^{pm}$ is measured as ( 16.3 $pm$ 1.2 (stat) $^{+0.7}_{-0.5}$ (syst) $pm$ 4.8 (norm) ) $times$ 10$^{-5}$, where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel.
A search for $CP$ violation in $D^{pm}rightarrow eta^{prime} pi^{pm}$ and $D^{pm}_{s}rightarrow eta^{prime} pi^{pm}$ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of $3$ fb$^{-1}$, recorded by the LHCb experiment at centre-of-mass energies of $7$ and $8$ TeV. The measured $CP$-violating charge asymmetries are $A_{CP}(D^{pm} rightarrow eta^{prime} pi^{pm})=(-0.61pm 0.72 pm 0.53 pm 0.12)%$ and $A_{CP}(D^{pm}_{s}rightarrow eta^{prime} pi^{pm})=(-0.82pm 0.36 pm 0.22 pm 0.27)%$, where the first uncertainties are statistical, the second systematic, and the third are the uncertainties on the $A_{CP}(D^{pm} rightarrow K^0_S pi^{pm})$ and $A_{CP}(D^{pm}_{s}rightarrow phi pi^{pm})$ measurements used for calibration. The results represent the most precise measurements of these asymmetries to date.
We study the decay B- --> J/psi K- pi+ pi- using 117 million BBbar events collected at the Y(4S) resonance with the BaBar detector at the PEP-II e+ e- asymmetric-energy storage ring. We measure the branching fractions Br(B- --> J/psi K- pi+ pi-) = (116 +- 7 (stat.) +- 9(syst.))* 10-5 and Br(B- --> X(3872)K-)* Br (X(3872) --> J/psi pi+ pi-) =(1.28+- 0.41)* 10-5 and find the mass of the X(3872) to be 3873.4 +- 1.4 MeV/c2. We search for the h_c narrow state in the decay B- --> h_c K-, h_c --> J/psi pi+ pi- and for the decay B- --> J/psi D0 pi-, with D0 --> K- pi+. We set the 90% C.L. limits Br(B- --> h_c K-)* Br (h_c --> J/psi pi+ pi-) <3.4 * 10-6 and Br(B- --> J/psi D0 pi-) <5.2 * 10-5.
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