We review recent results from the Belle experiment, which took data at the KEKB asymmetric-energy e+e- collider in Japan. The experiment recorded about 1000 fb^{-1} of data running mainly at the Υ(4S) and Υ(5S) resonances. The results presented here are obtained from the full data set.
The large data sample accumulated by the Belle experiment at KEKB asymmetric energy $e^+ e^-$ collider provides opportunities to study charmonia (bottomonia) and charmonium-like (bottomonium-like) exotic particles. In this review, we report recent results on these topics from Belle, including searches for $B\to h_c K$, $B\to Y(4260)K$, $B\to X(3872/3915) (\to χ_{c1} π^0 ) K$, $B^0 \to X(3872) γ$, $e^+e^- \to γχ_{cJ}$ and a new measurement of the $e^+ e^-\to Υ(nS) π^+ π^- (n=1,2,3)$ cross sections at energies from 10.52 to 11.02 GeV.
We present the selected recent charm results at Belle: (1) the $CP$ asymmetries and branching fractions for the decays of charm mesons, i.e. $D^{0}\toπ^{+}π^{-}η,\,K^{+}K^{-}η$ and $D^{0}\toϕη$; $D_{s}^{+}\to K^{+}π^{0},\,K^{+}η$ and $D_{s}^{+}\toπ^{+}π^{0},\,π^{+}η$. (2) the branching fractions for the decays of charmed baryons, i.e. $Λ_{c}^{+}\to pπ^{0},\,pη$; $Λ_{c}^{+}\toΛπ^{+}η,\,Σ^0π^{+}η$ and intermediate processes $Λ_{c}^{+}\toΛ(1670)π^{+},\,ηΣ(1385)^+$; $Ξ_c^0\toΛ\bar{K}^{*0},\,Σ^0\bar{K}^{*0}$ and $Σ^+K^{*-}$. (3) properties of excited charmed baryons, i.e. search for electromagnetic…
We report on the measurement of inclusive charmless semileptonic B decays $B \to X_{u} \ell ν$. The analysis makes use of hadronic tagging and is performed on the full data set of the Belle experiment comprising 772 million $B\bar{B}$ pairs. In the proceedings, the preliminary results of measurements of partial branching fractions and the CKM matrix element $|V_{ub}|$ are presented.
Recent charm results from Belle experiment are presented in this proceedings, including (1) measurement of mixing parameter $y_{CP}=(0.96\pm0.91\pm 0.62^{+0.17}_{-0.00})\%$ in $CP$-odd decay for the first time, (2) the first Dalitz-plot analysis of $D^0\to K^-π^+η$, (3) measurement of branching fractions of $Λ_c^+\toηΛ^0π^+$ and $ηΣ^0π^+$ and intermediate processes $Λ_c^+\to[Λ(1670)\toηΛ^0]π^+$ and $Λ_c^+\toηΣ(1385)^+$ relative to $Λ_c^+\to p K^-π^+$: $0.293\pm0.003\pm0.014$, $0.120\pm0.006\pm0.006$, $(5.54\pm0.29\pm0.73)\times10^{-2}$, and $0.192\pm 0.006\pm 0.016$, respectively, and (4) firs…
Belle II实验正在日本KEK实验室进行。Belle II将研究处于或接近于Upperdum(4S)共振的e+e碰撞,目标是收集50 ab-1的数据,这比Belle和BaBar实验记录的数据有很大增加。这些数据将提供大量的粲介子衰变样本,Belle II将有一个非常活跃的粲物理程序。在这里,我们讨论了这个计划的一些亮点,重点是测量混合,CP破坏,轻子衰变。
The Belle II experiment is an upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric $e^+e^-$ collider. The accelerator has already successfully completed the first phase of commissioning and first electron positron-collisions in Belle II were observed in April 2018. The design luminosity of SuperKEKB is 8x10$^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data. Belle II has a broad program of $τ$ physics, in particular, precision measurements of Standard Model parameters and searches of lepton flavor and lepton number violations, …