Belle

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2018-02-19
16:04
OpenAccess [PUBDB-2018-01249] Journal Article
; ; ; et al
Measurement of branching fractions of hadronic decays of the $\Omega_c ^{0}$ baryon
Using a data sample of 980  fb$^{−1}$ of $e^{+}e^{−}$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $e^{+}e^{−}$ collider, we report the results of a study of the decays of the $\Omega_c ^{0}$ charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the $\Omega_c ^{0}$ into $\Omega^{-}\pi^{+}\pi^{0},\Omega ^{-}\pi^{+}\pi^{-}\pi^{+},\Xi^{-}K^{-}\pi^{+}\pi^{+}$, and $\Xi^{0}K^{-}\pi^{+}$, as well as the first measurements of the branching fractions of the $\Omega_c ^{0}$ into $\Xi^{-}\bar{K^{0}}\pi^{+}\Xi^{0}\bar{K^{0}}$, and $\Lambda\bar{K^{0}}\bar{K^{0}}$ all with respect to the $\Omega^{-}\pi^+$ decay. [...]
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2018-02-16
15:52
OpenAccess [PUBDB-2018-01235] Report/Journal Article
; ; ; et al
Measurements of the absolute branching fractions of $\mathrm{B^ + → X _{c \bar{c}} K ^+}$ and $\mathrm{B^ + → \bar{D} ^{( * ) 0} π^ +}$ at Belle
[arXiv:1709.06108]
We present the measurement of the absolute branching fractions of $B^{+} \to X_{c\bar{c}} K^{+}$ and $B^{+} \to \bar{D}^{(\ast) 0} \pi^{+} $ decays, using a data sample of $772\times10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Here, $X_{c\bar{c}}$ denotes $\eta_{c}$, $J/\psi$, $\chi_{c0}$, $\chi_{c1}$, $\eta_{c}(2S)$, $\psi(2S)$, $\psi(3770)$, $X(3872)$, and $X(3915)$. [...]
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ddc:530
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2018-02-16
15:40
OpenAccess [PUBDB-2018-01234] Journal Article
; ; ; et al
Measurement of the $\tau$ lepton polarization and $R ( D ^* )$ in the decay $\bar{B} \to D ^* \tau ^- \bar{\nu} _\tau$ with one-prong hadronic $\tau$ decays at Belle
With the full data sample of $772×10^6  B\bar{B}$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $\bar{B} \to D^{∗}\tau^{−}\nu_\tau$ is studied with the hadronic $\tau$ decays $\tau^{-} \to \tau \pi^{-}\nu_\tau$ and $\tau^{-} \to \rho^{-}\nu_\tau$. The $\tau$ polarization $P_{\tau}(D^{∗})$ in two-body hadronic τ decays is measured, as well as the ratio of the branching fractions $R ( D ^* )$ = $\mathcal{B}(\bar{B}\to D^{∗}\tau^{−}\nu_\tau)/\mathcal{B}(\bar{B}\to D^{∗} ℓ^{-}\nu_{ℓ})$, where $ℓ^-$ denotes an electron or a muon [...]
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2018-01-10
13:58
OpenAccess [PUBDB-2018-00355] Report/Journal Article
; ; ; et al
Erratum to: Search for B decays to final states with the $\eta_c$ meson
[BELLE-PREPRINT-2015-1; KEK-PREPRINT-2014-42]
We report a search for $B$ decays to selected final states with the $\eta_c$ meson: $B^{\pm}\to K^{\pm}\eta_c\pi^+\pi^-$, $B^{\pm}\to K^{\pm}\eta_c\omega$, $B^{\pm}\to K^{\pm}\eta_c\eta$ and $B^{\pm}\to K^{\pm}\eta_c\pi^0$. The analysis is based on $772\times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. [...]
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2018-01-09
16:32
OpenAccess [PUBDB-2018-00299] Report/Journal Article
; ; ; et al
Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
[DESY-17-127; arXiv:1709.00009]
Light pseudoscalars interacting pre-dominantly with Standard Model gauge bosons (so-called axion-like particles or ALPs) occur frequently in extensions of the Standard Model. In this work we review and update existing constraints on ALPs in the keV to GeV mass region from colliders, beam dump experiments and astrophysics. [...]
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2017-12-21
18:11
arXiv [PUBDB-2017-14003] Preprint/Report
; ; ; et al
Search for $B^{-}\to\mu^{-}\bar\nu_\mu$ Decays at the Belle Experiment
[BELLE-PREPRINT-2017-17; KEK-PREPRINT-2017-21; arXiv:1712.04123]
We report the result of a search for the decay $B^{-}\to\mu^{-}\bar\nu_\mu$. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic $B$-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. [...]
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2017-12-21
18:05
arXiv [PUBDB-2017-14002] Preprint/Report
; ; ; et al
Observation of $\Xi_{c}(2930)^0$ and Updated Measurement of $B^{-} \to K^{-} \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-}$ at Belle
[BELLE-PREPRINT-#-2017-24; KEK-PREPRINT-#-2017-35; arXiv:1712.03612]
We report the first observation of the $\Xi_{c}(2930)^0$ charmed-strange baryon with a significance greater than 5$\sigma$. The $\Xi_{c}(2930)^0$ is found in its decay to $K^- \Lambda_{c}^+$ in $B^{-} \to K^{-} \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-}$ decays. [...]
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2017-12-21
17:59
OpenAccess [PUBDB-2017-14001] Preprint/Report
; ; ; et al
Study of $K^0_S$ pair production in single-tag two-photon collisions
[arXiv:1712.02145; Belle Preprint 2017-25, KEK Preprint 2017-36]
 GO
We report a measurement of the cross section for $K^0_S$ pair production in single-tag two-photon collisions, $\gamma^* \gamma \to K^0_S K^0_S$, for $Q^2$ up to 30 GeV$^2$, where $Q^2$ is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV < W < 2.6 GeV and $|\cos \theta^*| < 1.0$ for the total energy and kaon scattering angle, respectively, in the $\gamma^* \gamma$ center-of-mass system. [...]
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2017-12-21
17:20
OpenAccess [PUBDB-2017-13994] Preprint/Report
; ; ; et al
Search for $CP$ violation in the $D^{+}\to\pi^{+}\pi^{0}$ decay at Belle
[arXiv:1712.00619]
 GO
We search for $CP$ violation in the charged charm meson decay $D^{+}\to\pi^{+}\pi^{0}$, based on a data sample corresponding to an integrated luminosity of $\rm 921~fb^{-1}$ collected by the Belle experiment at the KEKB $e^{+}e^{-}$ asymmetric-energy collider. The measured $CP$ violating asymmetry is $[+2.31\pm1.24({\rm stat})\pm0.23({\rm syst})]\%$, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results..
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2017-12-21
17:17
OpenAccess [PUBDB-2017-13993] Preprint/Report
; ; ; et al
Measurement of Branching Fractions of Hadronic Decays of the $\Omega_c^0$ Baryon
[BELLE-PREPRINT-2017-23; KEK-PREPRINT-2017-33; arXiv:1712.01333]
 GO
Using a data sample of 980 ${\rm fb}^{-1}$ of $e^+e^-$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $e^+e^-$ collider, we report the results of a study of the decays of the $\Omega_c^0$ charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the $\Omega_c^0$ into $\Omega^-\pi^+\pi^0$, $\Omega^-\pi^+\pi^-\pi^+$, $\Xi^-K^-\pi^+\pi^+$, and $\Xi^0K^-\pi^+$, as well as the first measurements of the branching fractions of the $\Omega_c^0$ into $\Xi^-\bar{K}^0\pi^+$, $\Xi^0\bar{K}^0$, and $\Lambda \bar{K}^0\bar{K}^0$, all with respect to the $\Omega^-\pi^+$ decay. [...]
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