Belle

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2018-08-08
17:48
OpenAccess [PUBDB-2018-02862] Preprint/Report
; ; ; et al
Measurement of the branching fraction of $B → D ^{(*)} π ℓ ν$ at Belle using hadronic tagging in fully reconstructed events
[Belle preprint 2018-03; KEK Preprint 2017-67; arXiv:1803.06444]
 GO
We report a measurement of the branching fraction of the decay $B \rightarrow D^{(*)}\pi \ell\nu$. The analysis uses 772$\times 10^6$ $B\bar{B}$ pairs produced in $e^+e^-\rightarrow \Upsilon(4S)$ data recorded by the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collider. [...]
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2018-08-08
17:34
OpenAccess [PUBDB-2018-02861] Preprint/Report
; ; ; et al
Inclusive study of bottomonium production in association with an $\eta$ meson in $e^+e^-$ annihilations near $\Upsilon(5S)$
[Belle Preprint 2018-01; KEK Preprint 2017-60;arXiv:1803.03225]
 GO
We study bottomonium production in association with an $\eta$ meson in $e^+e^-$ annihilations near the $\Upsilon(5S)$, at a center of mass energy of $\sqrt{s}=10.866\,$GeV. The results are based on the $121.4\,$fb$^{-1}$ data sample collected by the Belle experiment at the asymmetric energy KEKB collider. [...]
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2018-08-08
17:26
OpenAccess [PUBDB-2018-02860] Preprint/Report
; ; ; 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]
 GO
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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2018-08-08
16:57
OpenAccess [PUBDB-2018-02859] Report/Journal Article
; ; ; et al
Measurement of time-dependent $CP$ asymmetries in $B^{0}\to K_S^0 \eta \gamma$ decays
[BELLE-PREPRINT-2018-07; KEK-PREPRINT-2018-1; arXiv:1803.07774]
We report a measurement of time-dependent $CP$ violation parameters in $B^0 → K^0_S ηγ$ decays. The study is based on a data sample, containing $772 × 10^6 B\bar{B}$ pairs, that was collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider. [...]
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2018-08-08
16:32
OpenAccess [PUBDB-2018-02858] Preprint/Report
; ; ; et al
Measurement of time-dependent $CP$ asymmetries in $B^{0}\to K_S^0 \eta \gamma$ decays
[BELLE-PREPRINT-2018-07; KEK-PREPRINT-2018-1; arXiv:1803.07774 ]
 GO
We report a measurement of time-dependent $CP$ violation parameters in $B^0 → K^0_S ηγ$ decays. The study is based on a data sample, containing $772 × 10^6 B\bar{B}$ pairs, that was collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^−$ collider [...]
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2018-08-08
15:37
OpenAccess [PUBDB-2018-02857] Report/Journal Article
; ; ; 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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ddc:550
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2018-08-08
15:14
OpenAccess [PUBDB-2018-02856] Report/Journal Article
; ; ; et al
Observation of $\Xi _{c}(2930)^0$and updated measurement of $B^{-} \rightarrow K^{-} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$ 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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2018-07-12
15:59
arXiv [PUBDB-2018-02593] Report/Journal Article
; ; ; et al
Study of $K_S^ 0$ pair production in single-tag two-photon collisions
[arXiv:1712.02145; Belle Preprint 2017-25, KEK Preprint 2017-36]
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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2018-07-12
15:36
OpenAccess [PUBDB-2018-02591] Report/Journal Article
; ; ; et al
Observation of excited $\Omega_c$ charmed baryons in $e^ + e^ −$ collisions
[BELLE-PREPRINT-2017-22; KEK-PREPRINT-2017-32; arXiv:1711.07927]
Using the entire Belle data sample of 980 ${\rm fb}^{-1}$ of $e^+e^-$ collisions, we present the results of a study of excited $\Omega_c$ charmed baryons in the decay mode $\Xi_c^+K^-$. We show confirmation of four of the five narrow states reported by the LHCb Collaboration: the $\Omega_c(3000)$ , $\Omega_c(3050)$, $\Omega_c(3066)$, and $\Omega_c(3090)$..
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2018-07-12
15:17
OpenAccess [PUBDB-2018-02588] Report/Journal Article
; ; ; et al
Measurement of the $\tau$ Michel parameters $\bar{\eta}$ and $\xi\kappa$ in the radiative leptonic decay $\tau^- \rightarrow \ell^- \nu_{\tau} \bar{\nu}_{\ell}\gamma$
[arXiv:1709.08833; Belle preprint 2017-20, KEK preprint 2017-29]
We present a measurement of the Michel parameters of the $\tau$ lepton, $\bar{\eta}$ and $\xi\kappa$, in the radiative leptonic decay $\tau^- \rightarrow \ell^- \nu_{\tau} \bar{\nu}_{\ell} \gamma$ using 711~f$\mathrm{b}^{-1}$ of collision data collected with the Belle detector at the KEKB $e^+e^-$ collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of $e^+e^-\rightarrow\tau^+\tau^-\rightarrow (\pi^+\pi^0 \bar{\nu}_\tau)(\ell^-\nu_{\tau}\bar{\nu}_{\ell}\gamma)$ $(\ell=e$ or $\mu)$. [...]
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