Belle

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2017-02-15
16:21
OpenAccess [PUBDB-2017-00974] Report/Journal Article
; ; ; et al
Search for $D^{0}$ decays to invisible final states at Belle
[BELLE-PREPRINT-2013-13; KEK-PREPRINT-2013-51; BELLE-PREPRINT-2016-13; KEK-PREPRINT-2016-51; arXiv:1611.09455] ddc:530
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 fb$^{-1}$ collected at and near the ϒ(4S) and ϒ(5S) resonances with the Belle detector at the KEKB asymmetric-energy $e^{+}e^-$ collider. [...]
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2017-02-15
16:11
OpenAccess [PUBDB-2017-00973] Report/Journal Article
; ; ; et al
Observation of $D^0 \to \rho^0\gamma$ and Search for $CP$ Violation in Radiative Charm Decays
[BELLE-CONF-1601; BELLE-PREPRINT-2016-11; arXiv:1603.03257] ddc:550
We report the first observation of the radiative charm decay $D^{0}→ρ^{0}γ$ and the first search for CP violation in decays $D^{0}→ρ^{0}γ$, ϕγ, and $\bar{K}$*0(892)γ, using a data sample of 943  fb$^{−1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^−$ collider. The branching fraction is measured to be B($D^{0}→ρ^{0}γ$)=(1.77±0.30±0.07)×10$^{−5}$, where the first uncertainty is statistical and the second is systematic. [...]
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2017-01-10
08:53
OpenAccess [PUBDB-2017-00384] Report/Journal Article
; ; ; et al
Measurement of the lepton forward-backward asymmetry in $B \rightarrow X_s \ell^+ \ell^-$ decays with a sum of exclusive modes
[BELLE-PREPRINT-2014-1; KEK-PREPRINT-2013-60; arXiv:1402.7134] ddc:530
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2017-01-05
10:22
OpenAccess [PUBDB-2017-00117] Report/Journal Article
; ; ; et al
Search for the $0^{--}$ Glueball in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays
[BELLE-PREPRINT-2016-12; KEK-PREPRINT-2016-50; arXiv:1611.07131] ddc:530
We report the first search for the $J^{PC}=0^{--}$ glueball in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays with data samples of $(102\pm2)$ million and $(158\pm4)$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90\% credibility level upper limits on their branching fractions in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays are obtained. [...]
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2016-12-22
16:19
OpenAccess [PUBDB-2016-06678] Poster
; ; ; et al
Migrating the Belle II Collaborative Services and Tools
22nd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2016, Meeting locationSan Francisco, USA, 10 Oct 2016 - 14 Oct 20162016-10-102016-10-14
 GO
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2016-12-20
10:55
OpenAccess [PUBDB-2016-06408] Preprint/Report
; ; ; et al
Lepton-Flavor-Dependent Angular Analysis of $B\to K^\ast \ell^+\ell^-$
[BELLE-PREPRINT-2016-15; KEK-PREPRINT-2016-54; arXiv:1612.05014]
 GO
We present a measurement of angular observables and a test of lepton flavor universality in the $B\to K^\ast \ell^+\ell^-$ decay, where $\ell$ is either $e$ or $\mu$. The analysis is performed on a data sample corresponding to an integrated luminosity of $711~\mathrm{fb}^{-1}$ containing $772\times 10^{6}$ $B\bar B$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the asymmetric-energy $e^+e^-$ collider KEKB. [...]
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2016-12-16
11:50
OpenAccess [PUBDB-2016-06279] Preprint/Report
; ; ; et al
Measurement of the $\tau$ lepton polarization and $R(D^*)$ in the decay $\bar{B} \to D^* \tau^- \bar{\nu}_\tau$
[KEK-PREPRINT-2016-53; BELLE-PREPRINT-2016-14; arXiv:1612.00529]
 GO
We report the first measurement of the $\tau$ lepton polarization $P_\tau(D^*)$ in the decay $\bar{B} \rightarrow D^* \tau^- \bar{\nu}_\tau$ as well as a new measurement of the ratio of the branching fractions $R(D^{*}) = \mathcal{B}(\bar {B} \rightarrow D^* \tau^- \bar{\nu}_\tau) / \mathcal{B}(\bar{B} \rightarrow D^* \ell^- \bar{\nu}_\ell)$, where $\ell^-$ denotes an electron or a muon, and the $\tau$ is reconstructed in the modes $\tau^- \rightarrow \pi^- \nu_\tau$ and $\tau^- \rightarrow \rho^- \nu_\tau$. We use the full data sample of $772 \times 10^6$ $B{\bar B}$ pairs recorded with the Belle detector at the KEKB electron-positron collider. [...]
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2016-12-16
11:20
OpenAccess [PUBDB-2016-06272] Preprint/Report
; ; ; et al
Search for $D^{0}$ decays to invisible final states at Belle
[BELLE-PREPRINT-2013-13; KEK-PREPRINT-2013-51; arXiv:1611.09455]
 GO
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. [...]
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2016-12-16
11:09
OpenAccess [PUBDB-2016-06269] Report/Journal Article
; ; ; et al
Search for a dark vector gauge boson decaying to $\pi^+ \pi^-$ using $\eta \rightarrow \pi^+\pi^- \gamma$ decays
[arXiv:1609.05599; Belle Preprint 2016-10, KEK Preprint 2016-19] ddc:530
We report a search for a dark vector gauge boson U′ that couples to quarks in the decay chain $D*^{+} \to D^{0}\pi^{+}, D^{0} \to K^{0}_{S}\eta, \eta \to U' \to \pi^{+}\pi^{-}$. No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of 10$^{-3}$-10$^{-2}$ in the U′ mass range of 290 to 520 MeV/c$^2$. [...]
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2016-11-28
15:24
OpenAccess [PUBDB-2016-05686] Report/Journal Article
; ; ; et al
Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau}$ relative to $\bar{B}^0 \rightarrow D^{*+} \ell^- \bar{\nu}_{\ell}$ decays with a semileptonic tagging method
[KEK-PREPRINT-2016-8; BELLE-PREPRINT-2016-8; arXiv:1607.07923] ddc:530
We report a measurement of the ratio R(D*)=B(B¯0→D*+τ-ν¯τ)/B(B¯0→D*+ℓ-ν¯ℓ), where ℓ denotes an electron or a muon. The results are based on a data sample containing 772×106 BB¯ pairs recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- collider. [...]
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