Belle

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2017-06-22
16:48
OpenAccess [PUBDB-2017-05897] Preprint/Report
; ; ; et al
Search for $CP$ violation and measurement of the branching fraction in $D^{0} \to K^0_S K^0_S$ decay
[arXiv:1705.05966; Belle-Preprint-2017-03; KEK-Preprint-2016-64]
 GO
We report a study of the decay $D^0 \to K^0_S K^0_S$ using 921~fb$^{-1}$ of data collected at or near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The measured time-integrated CP asymmetry is $ A_{CP}(D^0 \to K^0_S K^0_S) = (-0.02 \pm 1.53 \pm 0.02 \pm 0.17) \%$ and the branching fraction is $\mathcal{B} (D^{0}\rightarrow K_{S}^{0}K_{S}^{0})$ = (1.32 $\pm$ 0.02 $\pm$ 0.04 $\pm$ 0.04) $\times$ 10$^{-4}$, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode ($D^0 \to K_S^0 \pi^0$) used in the analysis. [...]
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2017-06-22
16:33
OpenAccess [PUBDB-2017-05893] Report/Journal Article
; ; ; et al
Observation of an alternative $\chi_{c0}(2P)$ candidate in $e^+ e^- \rightarrow J/\psi D \bar{D}$
[BELLE-PREPRINT-2017-07; KEK-PREPRINT-2017-3; arXiv:1704.01872] ddc:530
We perform a full amplitude analysis of the process $e^+ e^- \rightarrow J/\psi D \bar{D}$, where $D$ refers to either $D^0$ or $D^+$. A new charmoniumlike state $X^*(3860)$ that decays to $D \bar{D}$ is observed with a significance of $6.5\sigma$. [...]
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2017-06-22
16:23
OpenAccess [PUBDB-2017-05887] Report/Journal Article
; ; ; et al
First measurement of $\boldsymbol{T}$-odd moments in $\boldsymbol{D^{0} \rightarrow K_{S}^{0} \pi^{+} \pi^{-} \pi^{0}}$ decays
[BELLE-PREPRINT-2017-01; KEK-PREPRINT-2016-62; arXiv:1703.05721] ddc:530
We report the first measurement of the T-odd moments in the decay $D^0 \to K_{S}^0 π^+ π^- π^0$ from a data sample corresponding to an integrated luminosity of 966 fb$^{-1}$ collected by the Belle experiment at the KEKB asymmetric-energy e+e- collider. From these moments we determine the CP-violation-sensitive asymmetry $a_{CP}^{T-odd}$ = [-0.28$±$1.38(stat.)$_{-0.76}^{+0.23}$(syst.)] × 10$^{-3}$, which is consistent with no CP violation [...]
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2017-06-22
16:12
OpenAccess [PUBDB-2017-05882] Report/Journal Article
; ; ; 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] ddc:550
We report the first measurement of the τ lepton polarization $P_{τ}(D^*)$ in the decay $\bar{B} → D^{*}τ^{-}\bar{ν}_τ$ as well as a new measurement of the ratio of the branching fractions $R(D^{*}) = \mathcal{B}(\bar{B} → D^{*}τ^{-}\bar{ν}τ)\mathcal{B}(\bar{B} → D^{*} ℓ^{-}\bar{ν}ℓ)$, where $ℓ^-$ denotes an electron or a muon, and the $τ$ is reconstructed in the modes $τ^{-} → π^{-}ν_τ$ and $τ^{-} → ρ^{-}ν_τ$. We use the full data sample of 772 × 10$^{6} B\bar{B}$ pairs recorded with the Belle detector at the KEKB electron-positron collider. [...]
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2017-06-20
16:44
OpenAccess [PUBDB-2017-05646] Conference Presentation (Invited)
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Thermal Mockup Studies of Belle II Vertex Detector
International Conference on Technology and Instrumentation in Particle Physics, TIPP`17, Meeting locationBeijing, People's Republic of China, 22 May 2017 - 26 May 20172017-05-222017-05-26
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2017-06-20
16:39
OpenAccess [PUBDB-2017-05644] Conference Presentation (Invited)

Integration and characterization ofthe vertex detector in SuperKEKBcommissioning Phase 2
International Conference on Technology and Instrumentation in Particle Physics, TIPP'17, Meeting locationBeijing, People's Republic of China, 22 May 2017 - 26 May 20172017-05-222017-05-26
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2017-06-01
14:18
OpenAccess [PUBDB-2017-04150] Talk (non-conference) (Invited)

CDC track-reconstruction studies (Updates)
16th Belle II Computing Workshop, Meeting locationIsola d'Elba, DESY, Italy, 15 May 2017 - 19 May 20172017-05-152017-05-19
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2017-06-01
14:04
OpenAccess [PUBDB-2017-04146] Talk (non-conference) (Invited)

Fragmentation and Monte Carloe generators at Belle II
Workshop Excited QCD 2017, Meeting locationSintra, DESY, Portugal, 7 May 2017 - 13 May 20172017-05-072017-05-13
 GO
The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK “B factory” facility in Tsukuba, Japan aiming at an increase of the peak luminosity by a factor of 40. Commissioning of the SuperKEKB main ring took place in the first half of 2016. [...]
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2017-05-23
15:59
OpenAccess [PUBDB-2017-03477] Preprint/Report
; ; ; et al
Measurement of branching fraction and direct $CP$ asymmetry in charmless $B^+ \to K^+K^- \pi^+$ decays at Belle
[KEK-PREPRINT-2017-5; BELLE-PREPRINT-2017-09; arXiv:1705.02640]
 GO
We report a study of the charmless hadronic decay of the charged $B$ meson to the three-body final state $K^+ K^- \pi^+$. The results are based on a data sample that contains $772\times10^6$ $B \bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. [...]
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2017-05-12
16:30
OpenAccess [PUBDB-2017-02783] Report/Conference Presentation (Other)

Dark sector searches at Belle (II)
[BELLE2-TALK-CONF-2017-047]
Alpine LHC Physics Summit , ALPS2017, Meeting locationObergurgl, Obergurgl University Centre, Austria, 17 Apr 2017 - 22 Apr 20172017-04-172017-04-22
 GO
The dark photon, A′, the dark Higgs boson, h′, and the dark baryon, B', are hypothetical constituents featured in a number of recently proposed Dark Sector Models. Search for these particles are performed in the so-called dark Higgs-strahlung and radiative processes, and in neutral D-meson decays channels. [...]
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