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Register a new userStudies of charmed strange baryons in the $Lambda D$ final state at Belle
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We report the discovery of $Xi_{c}(3055)^{0}$, observed by its decay into the final state $Lambda D^{0}$, and present the first observation and evidence of the decays of $Xi_c(3055)^{+}$ and $Xi_c(3080)^{+}$ into $Lambda D^{+}$. We also perform a combined analysis of the $Lambda D^{+}$ with the $Sigma_{c}^{++}K^{-}$ and $Sigma_{c}^{ast ++}K^{-}$ decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions ${cal B}(Xi_{c}(3055)^{+} to Lambda D^{+})/{cal B}(Xi_{c}(3055)^{+} to Sigma_{c}^{++}K^{-})=5.09pm1.01pm0.76$, ${cal B}(Xi_{c}(3080)^{+} to Lambda D^{+})/{cal B}(Xi_{c}(3080)^{+} to Sigma_{c}^{++}K^{-})=1.29pm0.30pm0.15$, and ${cal B}(Xi_{c}(3080)^{+} to Sigma_{c}^{ast ++}K^{-})/{cal B}(Xi_{c}(3080)^{+} to Sigma_{c}^{++}K^{-})=1.07pm0.27pm0.01$, where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb$^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider.
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We report results of a study of doubly charmed baryons and charmed strange baryons. The analysis is performed using a 980 fb^-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We search for doubly charmed baryons Xi_cc^+(+) with the Lambda_c^+K^-pi^+(pi^+) and Xi_c^0pi^+(pi^+) final states. No significant signal is observed. We also search for two excited charmed strange baryons, Xi_c(3055)^+ and Xi_c(3123)^+ with the Sigma_c^++(2455)K^- and Sigma_c^++(2520)K^- final states. The Xi_c(3055)^+ signal is observed with a significance of 6.6 standard deviations including systematic uncertainty, while no signature of the Xi_c(3123)^+ is seen. We also study properties of the Xi_c(2645)^+ and measure a width of 2.6 +- 0.2 (stat) +- 0.4 (syst) MeV/c^2, which is the first significant determination.
We report a search for the doubly charmed baryon $Xi_{cc}^{+}$ through the decay $Xi_{cc}^{+} to Lambda_{c}^{+} K^{-} pi^{+}$, using a data sample corresponding to an integrated luminosity of $0.65~mathrm{pb^{-1}}$ of $pp$ collisions at $mathrm{sqrt{s}} = 7~mathrm{TeV}$. In the mass range 3300-3800$~mathrm{MeV}/c^{2}$ no significant signal is observed. Upper limits at $95%$ confidence level are set on $R$, the ratio of the production cross section of the $Xi_{cc}^{+}$ times the relevant branching fraction over the $Lambda_{c}^{+}$ cross section, as a function of the $Xi_{cc}^{+}$ mass and lifetime. The largest upper limits on $R$ over the investigated mass range are $R<1.5times10^{-2}$ for a lifetime of $100~mathrm{fs}$ and $R<3.9times10^{-4}$ for a lifetime of $400~mathrm{fs}$.
We report the result from the first search for $D^0$ decays to invisible final states. The analysis is performed on a data sample of 924 $rm{fb}^{-1}$ collected at and near the $Upsilon(4S)$ and $Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The absolute branching fraction is determined using an inclusive $D^0$ sample, obtained by fully reconstructing the rest of the particle system including the other charmed particle. No significant signal yield is observed and an upper limit of $9.4times 10^{-5}$ is set on the branching fraction of $D^0$ to invisible final states at 90% confidence level.
We present the energy spectra of the low lying doubly-charmed baryons using lattice quantum chromodynamics. We precisely predict the ground state mass of the charmed-strange Omega(cc) (1/2+) baryon to be 3712(11)(12) MeV which could well be the next doubly-charmed baryon to be discovered at the LHCb experiment at CERN. We also predict masses of other doubly-charmed strange baryons with quantum numbers 3/2+, 1/2-, and 3/2-.
Quarkonium is the bound state of a heavy quark and its anti-quark counterpart. The study of this system has experienced a renaissance thanks to results from e+e- collider experiments, including discoveries of long-predicted conventional quarkonia, and unusual states consisting of four quarks. The Belle Experiment operated at KEK in Japan from 1999-2010. Analysis of the collected data continues to produce new findings. The Belle II experiment is a substantial upgrade of both the Belle detector and the KEKB accelerator, aiming to collect 50 times more data beginning in 2018. This talk presented recent Belle results related to hadronic and radiative decays in the bottomonium system. It described the capabilities of Belle II to explore these topics, with a particular focus on the physics reach of the first data, where unique opportunities exist to make an immediate impact in this area.
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