Belle

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2019-01-28
11:50
OpenAccess [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]
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$^{-1}$. [...]
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2019-01-11
08:34
OpenAccess [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]
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. [...]
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2019-01-10
16:55
Embargoed OpenAccess [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. [...]
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2019-01-10
08:57
OpenAccess [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]
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. [...]
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2018-12-21
14:40
OpenAccess [PUBDB-2018-05864] Contribution to a conference proceedings

Recent Results on Diffraction at HERA
18th Lomonosov Conference on Elementary Particle Physics, LOMCON17, MoscowMoscow, Russia, 24 Aug 2017 - 30 Aug 20172017-08-242017-08-30 6 pp. () [10.3204/PUBDB-2018-05864]  GO
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. [...]
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2018-12-19
15:57
OpenAccess [PUBDB-2018-05754] Conference Presentation (Invited)

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 20182018-03-182018-03-21  GO
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2018-12-18
15:26
OpenAccess [PUBDB-2018-05694] Poster

The Belle II Pixel Detector
The 27th International Workshop on Vertex Detectors, Vertex 2018, ChennaiChennai, India, 21 Oct 2018 - 26 Oct 20182018-10-212018-10-26  GO
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2018-12-13
16:52
OpenAccess [PUBDB-2018-05459] Talk (non-conference) (Invited)

Dark sector physics with photons at Belle II
Seminar, Karlsruhe Institute of TechnologyKarlsruhe, Karlsruhe Institute of Technology, Germany, 24 Sep 2018 - 26 Sep 20182018-09-242018-09-26  GO
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2018-12-13
16:17
OpenAccess [PUBDB-2018-05458] Lecture (Invited)

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 20182018-03-052018-03-05  GO
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. [...]
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2018-12-13
15:50
OpenAccess [PUBDB-2018-05455] Conference Presentation (Invited)

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 20182018-11-122018-11-14  GO
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