# Belle

 2019-01-2811:50 [PUBDB-2019-00770] Report/Journal Article et al Measurement of the Decays $\Lambda_c\to \Sigma\pi\pi$ at Belle [BELLE Preprint 2017-26; KEK Preprint 2017-39; arXiv:1802.03421] Physical review / D 98(11), 112006 (2018) [10.1103/PhysRevD.98.112006]   We report measurements of the branching fractions of the decays $\Lambda^+_c\to\Sigma^+\pi^-\pi^+$, $\Lambda^+_c\to\Sigma^0\pi^+\pi^0$ and $\Lambda^+_c\to\Sigma^+\pi^0\pi^0$ relative to the reference channel $\Lambda^+_c\to pK^-\pi^+$. The analysis is based on the full data sample collected at and close to $\Upsilon(4S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider corresponding to the integrated luminosity of 711 fb$^{-1}$. [...] OpenAccess: PDF PDF (PDFA); 2019-01-1108:34 [PUBDB-2019-00380] Report/Journal Article et al Production cross sections of hyperons and charmed baryons from $e^+e^-$ annihilation near $\sqrt{s} = 10.52$~GeV [BELLE-PREPRINT-2017-14; KEK-PREPRINT-2017-15; arXiv:1706.06791] Physical review / D 97(7), 072005 (2018) [10.1103/PhysRevD.97.072005]   We measure the inclusive production cross sections of hyperons and charmed baryons from $e^+e^-$ annihilation using a 800 fb$^{-1}$ data sample taken near the $ϒ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The feed-down contributions from heavy particles are subtracted using our data, and the direct production cross sections are presented for the first time. [...] OpenAccess: PDF PDF (PDFA); 2019-01-1016:55 [PUBDB-2019-00343] Report/Journal Article et al Thermal mock-up studies of the Belle II vertex detector [arXiv:1607.00663]   The ongoing upgrade of the asymmetric electron–positron collider SuperKEKB at the KEK laboratory, Japan aims at a 40-fold increase of the peak luminosity to $8 × 10^{35} cm^ {−2} s ^{−1}$ . At the same time the complex Belle II detector is being significantly upgraded to be able to cope with the higher background level and trigger rates and to improve overall performance. [...] Published on 2018-04-21. Available in OpenAccess from 2019-04-21.: PDF PDF (PDFA); Restricted: PDF PDF (PDFA); External link: Fulltext 2019-01-1008:57 [PUBDB-2019-00251] Report/Journal Article et al Observation of $\mathrm{\Upsilon(2S)\to\gamma \eta_{b}(1S)}$ decay [BELLE-PREPRINT-2018-14; KEK-PREPRINT-2018-20; PNNL-SA-135879; arXiv:1807.01201] Physical review letters 121, 232001 (2018) [10.1103/PhysRevLett.121.232001]   We report the observation of $\mathrm{\Upsilon(2S)\to\gamma \eta_{b}(1S)}$ decay based on an analysis of the inclusive photon spectrum of 24.7 fb$^{-1}$ of e$^+$e$^-$ collisions at the ϒ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e$^+$e$^-$ collider. We measure a branching fraction of $\mathcal{B}[ϒ(2S) \to\gamma \eta_{b}(1S)]=(6.1_{-0.7-0.6}^{+0.6+0.9}) × 10^{-4}$ and derive an $η_{b}(1S)$ mass of $9394.8_{-3.1-2.7}^{+2.7+4.5} MeV/c^2$, where the uncertainties are statistical and systematic, respectively. [...] OpenAccess: PDF PDF (PDFA); 2018-12-2114:40 [PUBDB-2018-05864] Contribution to a conference proceedings Levonian, Serguei V. Recent Results on Diffraction at HERA 18th Lomonosov Conference on Elementary Particle Physics, LOMCON17, MoscowMoscow, Russia, 24 Aug 2017 - 30 Aug 2017 6 pp. (2018) [10.3204/PUBDB-2018-05864]   Four new measurements are presented from the area of diffractive andexclusive production at HERA. Isolated photons are studiedin diffractive photo-production, while open charm cross section and cross-section ratio $σ_{ψ(2S)}/σ_{J/ψ(1S)}$ are measured in diffractive deep-inelastic scattering (DIS) regime. [...] OpenAccess: PDF PDF (PDFA); 2018-12-1915:57 [PUBDB-2018-05754] Conference Presentation (Invited) Guo, A. XYZ Physis prospects at the Belle II Experiment 2nd International Workshop on High Intensity Electron-Positron Accelerator , HIEPA 2018, BeijingBeijing, China, 18 Mar 2018 - 21 Mar 2018   OpenAccess: PDF PDF (PDFA); 2018-12-1815:26 [PUBDB-2018-05694] Poster Belle II PXD Collaboration The Belle II Pixel Detector The 27th International Workshop on Vertex Detectors, Vertex 2018, ChennaiChennai, India, 21 Oct 2018 - 26 Oct 2018   OpenAccess: PDF PDF (PDFA); 2018-12-1316:52 [PUBDB-2018-05459] Talk (non-conference) (Invited) Cunliffe, S. T. Dark sector physics with photons at Belle II Seminar, Karlsruhe Institute of TechnologyKarlsruhe, Karlsruhe Institute of Technology, Germany, 24 Sep 2018 - 26 Sep 2018   OpenAccess: PDF PDF (PDFA); External link: Fulltext 2018-12-1316:17 [PUBDB-2018-05458] Lecture (Invited) Wehle, S. Testing the Standard Model in rare decays of $B$ mesons at the Belle experiment Lecture at CEA Saclay (Parys- Saclay, France), 5 Mar 2018 - 5 Mar 2018   Rare decays of B mesons are an ideal probe to search for phenomena beyond the Standard Modelof particle physics, since contributions from new particles can aect the decays on the same level asStandard Model predictions. The rare decay of B ! K*ll oers the quark transition b ! sll, a avorchanging neutral current which is forbidden at tree level in the Standard Model. [...] OpenAccess: PDF PDF (PDFA); 2018-12-1315:50 [PUBDB-2018-05455] Conference Presentation (Invited) Wehle, S. Motivation for analysing $b→sll$ decays at CEPC The 2018 International Workshop on the High Energy Circular Electron Positron Collider, CEPS 2018, BeijingBeijing, China, 12 Nov 2018 - 14 Nov 2018   OpenAccess: PDF; External link: Fulltext