Belle

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2017-12-04
17:26
OpenAccess [PUBDB-2017-12745] Bachelor Thesis
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A sensitivity study of the $B^0\rightarrow K^*(892)^0 \mu^+ \mu^- $decay at the Belle II experiment
DESY-Hamburg, 55 pp. (2017) [10.3204/PUBDB-2017-12745] = Bachelorarbeit, University of Hamburg, 2017  GO
Although the Standard Model of particle physics is well established by many experimentssome phenomena are observed that cannot be explained by the Standard Model alone. Furthermorerecent evaluations of experimental data yield results deviating from the Standard Model'spredictions with a significance of up to 4$\sigma$5$\sigma$ [...]
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2017-11-16
14:19
OpenAccess [PUBDB-2017-12061] Bachelor Thesis
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Sensitivity Study for the $B^+ \rightarrow K^*(892)^+\mu^+ \mu^-$ Decay at the Belle II Experiment
DESY-Hamburg : DESY, 48 pp. (2017) [10.3204/PUBDB-2017-12061] = Bachelorarbeit, University of Hamburg, 2017  GO
With B meson decays it is possible to probe the Standard Model of particle physics without thenecessity to investigate high energy scales. In previous analyses, the quark transition $b \to s\ell^{+}\ell^{-}$ showed signs of New Physics in kinematic observables that deviated from the Standard Modelpredictions [...]
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2017-11-16
12:23
OpenAccess [PUBDB-2017-12048] Preprint/Report
; ; ; et al
Search for light tetraquark states in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays
[BELLE-PREPRINT-2017-21; KEK-PREPRINT-2017-30; arXiv:1711.01690]
 GO
We search for the $J^{PC}=0^{--}$ and $1^{+-}$ light tetraquark states with masses up to 2.46~GeV/$c^2$ in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays with data samples of $(102\pm 2)$ million and $(158\pm 4)$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90\% credibility level (C.L.) upper limits on their branching fractions in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays are obtained. [...]
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2017-11-16
12:14
OpenAccess [PUBDB-2017-12047] Report/Journal Article
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Study of $\eta$ and dipion transitions in $\Upsilon(4S)$ decays to lower bottomonia
[BELLE-PREPRINT-2017-16; KEK-PREPRINT-2017-17; arXiv:1707.04973] ddc:530
We study hadronic transitions between bottomonium states using 496 fb$^{-1}$ data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^{+}e^{-}$ collider. We measure: ${\cal B}(\Upsilon(4S)\to\pi^+\pi^-\Upsilon(1S))=(8.2\pm 0.5 {\rm(stat.)} \pm 0.4 {\rm(syst.)})\times10^{-5}$, ${\cal B}(\Upsilon(4S)\to\pi^+\pi^-\Upsilon(2S))=(7.9\pm 1.0 {\rm(stat.)} \pm 0.4 {\rm(syst.)})\times10^{-5}$, and ${\cal B}(\Upsilon(4S)\to\eta\Upsilon(1S))=(1.70\pm 0.23 {\rm(stat.)} \pm 0.08 {\rm(syst.)})\times10^{-4}$. [...]
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2017-11-16
11:58
OpenAccess [PUBDB-2017-12046] Report/Journal Article
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Evidence for Isospin Violation and Measurement of $CP$ Asymmetries in $B \to K^{\ast}(892) \gamma$
[BELLE-PREPRINT-2017-08; KEK-PREPRINT-2017-4; arXiv:1707.00394]
15th Conference on Flavor Physics and CP Violation, FPCP 2017, Meeting locationPrague, Czech Republic, 5 Jun 2017 - 9 Jun 20172017-06-052017-06-09 Physical review letters 119(19), 191802 (2017) [10.1103/PhysRevLett.119.191802]  GO
ddc:550
We report the first evidence for isospin violation in $B \to K^* \gamma$ and the first measurement of difference of $CP$ asymmetries between $B^+ \to K^{*+} \gamma$ and $B^0 \to K^{*0} \gamma$. This analysis is based on the data sample containing $772 \times 10^6 B\bar{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. [...]
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2017-11-16
11:27
OpenAccess [PUBDB-2017-12039] Report/Journal Article
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Search for $\Lambda_c^+\to\phi p \pi^0$ and branching fraction measurement of $\Lambda_c^+\to K^-\pi^+ p \pi^0$
[BELLE-PREPRINT-2017-12; KEK-PREPRINT-2017-08; UCHEP-2017-06; arXiv:1707.00089] ddc:530
We have searched for the Cabibbo-suppressed decay $\Lambda_c^+\to\phi p\pi^0$ in $e^+e^-$ collisions using a data sample corresponding to an integrated luminosity of 915 $\rm fb^{-1}$. The data were collected by the Belle experiment at the KEKB $e^+e^-$ asymmetric-energy collider running at or near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances. [...]
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2017-11-16
11:16
OpenAccess [PUBDB-2017-12038] Report/Journal Article
; ; ; et al
Search for $CP$ Violation and Measurement of the Branching Fraction in the Decay $D^{0} \to K^0_S K^0_S$
[Belle-Preprint-2017-03; KEK-Preprint-2016-64; arXiv:1705.05966] ddc:550
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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2017-11-03
11:49
OpenAccess [PUBDB-2017-11677] Conference Presentation (Invited)
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Status of SuperKEKB and Belle II
The 12th International Workshop on Heavy Quarkonium, Quarkonium 2017, Meeting locationBeijing, Peking University, School of Physics, China, 6 Nov 2017 - 10 Nov 20172017-11-062017-11-10  GO
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2017-10-26
17:05
arXiv [PUBDB-2017-11582] Preprint/Report
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Measurement of the $\tau$ lepton polarization and $R(D^*)$ in the decay $\bar{B} \rightarrow D^* \tau^- \bar{\nu}_\tau$ with one-prong hadronic $\tau$ decays at Belle
[KEK-PREPRINT-2017-26; BELLE-PREPRINT-2017-18; arXiv:1709.00129]
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With the full data sample of $772 \times 10^6$ $B{\bar B}$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $\bar{B} \rightarrow D^* \tau^- \bar{\nu}_\tau$ is studied with the hadronic $\tau$ decays $\tau^- \rightarrow \pi^- \nu_\tau$ and $\tau^- \rightarrow \rho^- \nu_\tau$. The $\tau$ polarization $P_\tau(D^*)$ in two-body hadronic $\tau$ decays is measured, as well as 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. [...]
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2017-09-20
15:53
OpenAccess [PUBDB-2017-10930] Preprint/Report
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Measurements of the absolute branching fractions of $B^{+} \to X_{c\bar{c}} K^{+}$ and $B^{+} \to \bar{D}^{(\ast) 0} \pi^{+} $ at Belle
[arXiv:1709.06108]
 GO
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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