Time filter

Source Type

Suying C.,Institute of High Energy Physics | Mingchuan Z.,Institute of High Energy Physics | Jingxi Z.,Institute of High Energy Physics
IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference | Year: 2016

To quickly find the causes of the accelerator unstable or lost beam caused by magnet power supply in the Beijing Electron Positron Collider running, this set of rapid detection system for magnet power supply is developed. The stability of the system in 8 hours is about 0.005%,it can acquire over nearly 500 sets of magnet power supply current value most quickly in the 0.33ms time. All data is written to the MySQL database in real time, So as to be able to quickly troubleshoot magnet power supply problem through historical data analysis of database comparison. Copyright © 2016 CC-BY-3.0 and by the respective authors.


PubMed | Karlsruhe Institute of Technology, Gifu University, National United University, National Research Nuclear University MEPhI and 63 more.
Type: Journal Article | Journal: Physical review letters | Year: 2016

We report the first observation of the decay _{c}^{+}pK^{+}^{-} using a 980fb^{-1} data sample collected by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be B(_{c}^{+}pK^{+}^{-})/B(_{c}^{+}pK^{-}^{+})=(2.350.270.21)10^{-3}, where the uncertainties are statistical and systematic, respectively.


PubMed | Karlsruhe Institute of Technology, National Research Nuclear University MEPhI, University of the Basque Country, Korea Institute of Science and Technology and 57 more.
Type: Journal Article | Journal: Physical review letters | Year: 2016

We report the analysis of the three-body e^{+}e^{-}BB[over ]^{}, BB[over ]^{*}^{}, and B^{*}B[over ]^{*}^{} processes, including the first observations of the Z_{b}^{}(10610)[BB[over ]^{*}+c.c.]^{} and Z_{b}^{}(10650)[B^{*}B[over ]^{*}]^{} transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of (e^{+}e^{-}[BB[over ]^{*}+c.c.]^{}^{})=[17.41.6(stat)1.9(syst)]pb and (e^{+}e^{-}[B^{*}B[over ]^{*}]^{}^{})=[8.751.15(stat)1.04(syst)]pb and set a 90%C.L. upper limit of (e^{+}e^{-}[BB[over ]]^{}^{})<2.9pb. The results are based on a 121.4fb^{-1} data sample collected with the Belle detector at a center-of-mass energy near the (10860) peak.


PubMed | Punjab Agricultural University, Gifu University, National United University, German Electron Synchrotron and 64 more.
Type: Journal Article | Journal: Physical review letters | Year: 2016

We measure the decay B_{s}^{0}K^{0}K[over ]^{0} using data collected at the (5S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. The data sample used corresponds to an integrated luminosity of 121.4fb^{-1}. We measure a branching fraction B(B_{s}^{0}K^{0}K[over ]^{0})=[19.6_{-5.1}^{+5.8}(stat)1.0(syst)2.0(N_{B_{s}^{0}B[over ]_{s}^{0}})]10^{-6} with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.


PubMed | Karlsruhe Institute of Technology, National United University, German Electron Synchrotron, University of the Basque Country and 64 more.
Type: Journal Article | Journal: Physical review letters | Year: 2016

Using data collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider, we measure the energy dependence of the e^{+}e^{-}h_{b}(nP)^{+}^{-} (n=1, 2) cross sections from thresholds up to 11.02GeV. We find clear (10860) and (11020) peaks with little or no continuum contribution. We study the resonant substructure of the (11020)h_{b}(nP)^{+}^{-} transitions and find evidence that they proceed entirely via the intermediate isovector states Z_{b}(10610) and Z_{b}(10650). The relative fraction of these states is loosely constrained by the current data: The hypothesis that only Z_{b}(10610) is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only Z_{b}(10650) is produced is not excluded at a significant level.

Loading Institute of High Energy Physics collaborators
Loading Institute of High Energy Physics collaborators