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Register a new userSearch for the decay $B^+rightarrowoverline{K}{}^{*0}K^{*+}$ at Belle
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We report a search for the rare charmless decay $B^+rightarrowoverline{K}{}^{*0}K^{*+}$ using a data sample of $772times10^6$ $Bbar{B}$ pairs collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No statistically significant signal is found and a 90% confidence-level upper limit is set on the decay branching fraction as $ mathcal{B}(B^+rightarrowoverline{K}{}^{*0}K^{*+}) <1.31times 10^{-6}$.
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We report the measurement of the branching fraction and $CP$ asymmetry for the $bar{B}^{0}(B^{0})to K^{0}_{S}K^{mp}pi^{pm}$ decay. The analysis is performed 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 an $mathcal{A}_{CP}$ of $(-8.5pm8.9pm0.2)%$, where the first uncertainties are statistical and the second are systematic. Hints of peaking structures are also observed in the differential branching fraction as functions of Dalitz variables.
We report on the first measurement of the direct $CP$-violating asymmetry ($mathcal{A}$) in the charmless decay $B^0 to K^0pi^0$ at Belle II and an updated measurement of its branching fraction ($mathcal{B}$). We use a sample of electron-positron collisions collected in 2019 and 2020 at the $Upsilon(4S)$ resonance and corresponding to $62.8$ $text{fb}^{-1}$ of integrated luminosity. We reconstruct and select about $50$ $B^0 to K_S^0 pi^0$ candidates, and we measure $mathcal{A}_{{K^0pi^0}} = -0.40_{-0.44}^{+0.46} (text{stat}) pm 0.04 (text{syst})$ and $mathcal{B}(B^0 to K^0 pi^0) = [8.5_{-1.6}^{+1.7} (text{stat}) pm 1.2 (text{syst})] times 10^{-6}$. This is the first measurement of $CP$ violation in $B^0 to K^0pi^0$ decays reported by Belle II. The results agree with previous determinations and show a detector performance comparable with the best Belle results.
We report the measurements of branching fractions and CP violation asymmetries in $B^0 to phi K^{*}$ decays obtained in an angular analysis using the full data sample of $772 times 10^6 Bbar{B}$ pairs collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We perform a partial wave analysis to distinguish among scalar [$B^0 to phi(Kpi)^{*}_{0}$], vector [$B^0 to phi K^{*}(892)^{0}$] and tensor [$B^0 to phi K^{*}_{2}(1430)^{0}$] components, and determine the corresponding branching fractions to be $mathcal{B}[B^0 to phi(Kpi)^{*}_{0}] = (4.3 pm 0.4 pm 0.4) times 10^{-6}$, $mathcal{B}[B^0 to phi K^{*}(892)^{0}] = (10.4 pm 0.5 pm 0.6) times 10^{-6}$ and $mathcal{B}[B^0 to phi K^{*}_{2}(1430)^{0}] = (5.5 ^{+0.9}_{-0.7} pm 1.0) times 10^{-6}$. We also measure the longitudinal polarization fraction $f_L$ in $B^0 to phi K^{*}(892)^{0}$ and $B^0 to phi K^{*}_{2}(1430)^{0}$ decays to be $0.499 pm 0.030 pm 0.018$ and $0.918 ^{+0.029}_{-0.060} pm 0.012$, respectively. The first quoted uncertainties are statistical and the second are systematic. In total, we measure 26 parameters related to branching fractions, polarization and CP violation in the $B^0 to phi K^{*}$ system. No evidence for CP violation is found.
One of the most intriguing puzzles in hadron spectroscopy are the numerous charmonium-like states observed in the last decade, including charged states that are manifestly exotic. Over the years, the experiment $BABAR$ has extensively studied those in B meson decays, initial state radiation processes and two photon reactions. We report in this paper a new study on some of those states, performed using the entire data sample collected by $BABAR$ in $e^+e^-$ collisions, at center of mass energies near 10.58 GeV/c$^2$. The study of the process $B rightarrow J/psi phi K$ will be presented, and the search for the resonant states X(4140) and X(4270) in their decays to $J/psi phi$, will be highlighted.
We report a search for charmless hadronic decays of charged $B$ mesons to the final states $K^{0}_{S} K^{0}_{S} K^{pm}$ and $K^{0}_{S} K^{0}_{S} pi^{pm}$ . The results are based on a $711 {fb}^{-1}$ data sample that contains $772 times 10^6$ $B bar{B}$ pairs, and was collected at the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. For $B^{pm} to K^{0}_{S} K^{0}_{S} K^{pm}$ decays, the measured branching fraction and direct $CP$ asymmetry are $[10.64pm0.49(stat)pm 0.44(syst)]times10^{-6}$ and [$-0.6pm3.9(stat)pm 3.4(syst)$] %, respectively. In the absence of a statistically significant signal for $B^{pm}to K^{0}_{S} K^{0}_{S} pi^{pm}$, we set the 90 % confidence-level upper limit on its branching fraction at $1.14 times 10^{-6}$.
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