We report the first search for the ${J}^{PC}={0}^{\ensuremath{-}\ensuremath{-}}$ glueball in $\mathrm{\ensuremath{\Upsilon}}(1S)$ and $\mathrm{\ensuremath{\Upsilon}}(2S)$ decays with data samples of $(102\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}1{0}^{6}$ and $(158\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}1{0}^{6}$ 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 $\mathrm{\ensuremath{\Upsilon}}(1S)$ and $\mathrm{\ensuremath{\Upsilon}}(2S)$ decays are obtained. The inclusive branching fractions of the $\mathrm{\ensuremath{\Upsilon}}(1S)$ and $\mathrm{\ensuremath{\Upsilon}}(2S)$ decays into final states with a ${\ensuremath{\chi}}_{c1}$ are measured to be $\mathcal{B}(\mathrm{\ensuremath{\Upsilon}}(1S)\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}+\text{anything})=(1.90\ifmmode\pm\else\textpm\fi{}0.43(\text{stat})\ifmmode\pm\else\textpm\fi{}0.14(\text{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ with an improved precision over prior measurements and $\mathcal{B}(\mathrm{\ensuremath{\Upsilon}}(2S)\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}+\text{anything})=(2.24\ifmmode\pm\else\textpm\fi{}0.44(\text{stat})\ifmmode\pm\else\textpm\fi{}0.20(\text{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ for the first time.

10.1103/physrevd.95.012001

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Citations (12)

Search for transitions from ϒ(4S) and ϒ(5S) to <…

Physical review. D/Physical review. D. (2020)

P. Oskin R. Mizuk H. Aihara D. M. Asner H. Atmacan

Using data collected in the Belle experiment at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider we search for transitions $\mathrm{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{b}(1S)\ensuremath{\omega}$, $\mathrm{\ensuremath{\Upsilon}}(5S)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{b}(1S)\ensuremath{\omega}$ and $\mathrm{\ensuremath{\Upsilon}}(5S)\ensuremath{\rightarrow}{\ensuremath{\eta}}_{b}(2S)\ensuremath{\omega}$. No significant signals are observed and we set 90% confidence level upper limits on the corresponding visible cross sections: 0.2 pb, 0.4 pb and 1.9 pb, respectively.

KEKB

10.1103/physrevd.102.092011

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Citations (2)

An Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System

arXiv (Cornell University) (2002)

Kazuo Abe Y. Chao S. Kobayashi S. Yanaka D. Liventsev

We present an improved measurement of the standard model CP violation parameter sin2phi_1 (also known as sin2beta) based on a sample of 85 times 10^6 B Bbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in a J/psi K_S, psi(2S) K_S, chi_{c1} K_S, eta_c K_S, J/psi K^{*0}, or J/psi K_L CP-eigenstate decay channel and the flavor of accompanying B meson is identified from itsdecay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain sin2phi_1 = 0.719 +/- 0.074(stat) +/- 0.035(syst). We also report measurements of CP violation parameters for the related B^0 -> J/psi pi^0 decay mode and the penguin-dominated processes B^0 -> eta' K_S, phi K_S and K^+K^- K_S.

B meson

CP violation

10.48550/arxiv.hep-ex/0207098

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Citations (10)

Study of Michel parameters in leptonic $\tau$ decays at Belle

A. Abdesselam Y. Chao S. Esen S. Vahsen H. Nakayama

Michel foucault

Source

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Citations (3)

Production cross sections of light and charmed mesons in $e^+e^-$ annihilation near 10.58 GeV

arXiv (Cornell University) (2024)

Belle Collaboration R. Seidl I. Adachi H. Aihara T. Aushev

We report measurements of production cross sections for $\rho^+$, $\rho^0$, $\omega$, $K^{*+}$, $K^{*0}$, $\phi$, $\eta$, $K_S^0$, $f_0(980)$, $D^+$, $D^0$, $D_s^+$, $D^{*+}$, $D^{*0}$, and $D^{*+}_s$ in $e^+e^-$ collisions at a center-of-mass energy near 10.58 GeV. The data were recorded by the Belle experiment, consisting of 571 fb$^{-1}$ at 10.58 GeV and 74 fb$^{-1}$ at 10.52 GeV. Production cross sections are extracted as a function of the fractional hadron momentum $x_p$ . The measurements are compared to {\sc pythia} Monte Carlo generator predictions with various fragmentation settings, including those that have increased fragmentation into vector mesons over pseudo-scalar mesons. The cross sections measured for light hadrons are consistent with no additional increase of vector over pseudo-scalar mesons. The charmed-meson cross sections are compared to earlier measurements -- when available -- including older Belle results, which they supersede. They are in agreement before application of an improved initial-state radiation correction procedure that causes slight changes in their \xp shapes.

Annihilation

Electron–positron annihilation

10.48550/arxiv.2411.12216

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Measurement of the branching fraction of B→D(*)πℓν at Belle using hadronic tagging in fully reconstructed events

Physical review. D/Physical review. D. (2018)

A. Vossen I. Adachi K. Adamczyk H. Aihara S. Al Said

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. The tagging $B$ meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay $B \rightarrow D^{(*)}\pi \ell\nu$ $(\ell=e,\mu)$. The measured branching fractions are $\mathcal{B}(B^+ \rightarrow D^-\pi^+ \ell^+\nu)$ = [4.55 $\pm$ 0.27 (stat.) $\pm$ 0.39 (syst.)]$\times 10^{-3}$, $\mathcal{B}(B^0 \rightarrow \bar{D}^0\pi^- \ell^+\nu)$ = [4.05 $\pm$ 0.36 (stat.) $\pm$ 0.41 (syst.)]$\times 10^{-3}$, $\mathcal{B}(B^+ \rightarrow D^{*-}\pi^+ \ell^+\nu)$ = [6.03 $\pm$ 0.43 (stat.) $\pm$ 0.38 (syst.)]$\times 10^{-3}$, and $\mathcal{B}(B^0 \rightarrow \bar{D}^{*0}\pi^- \ell^+\nu)$ = [6.46 $\pm$ 0.53 (stat.) $\pm$ 0.52 (syst.)]$\times 10^{-3}$. These are in good agreement with the current world average values.

KEKB

Branching fraction

Bar (unit)

Branching (polymer chemistry)

Electron–positron annihilation

B meson

10.1103/physrevd.98.012005

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Citations (7)

Search for lepton-flavor-violating $τ^- \to \ell^-ϕ$ decays in 2019-2021 Belle II data

arXiv (Cornell University) (2023)

Belle II Collaboration F. Abudinén I. Adachi K. Adamczyk L. Aggarwal

We report a search for lepton-flavor-violating decays $\tau^- \to \ell^- \phi$ ($\ell^- =e^-,\mu^-$) at the Belle II experiment, using a sample of electron-positron data produced at the SuperKEKB collider in 2019-2021 and corresponding to an integrated luminosity of 190 fb$^{-1}$. We use a new untagged selection for $e^+e^- \to \tau^+\tau^-$ events, where the signal $\tau$ is searched for as a neutrinoless final state of a single charged lepton and a $\phi$ meson and the other $\tau$ is not reconstructed in any specific decay mode, in contrast to previous measurements by the BaBar and Belle experiments. We find no evidence for $\tau^- \to \ell^- \phi$ decays and obtain upper limits on the branching fractions at 90% confidence level of 23 $\times 10^{-8}$ and 9.7$\times 10^{-8}$ for $\tau^- \rightarrow e^-\phi$ and $\tau^- \rightarrow \mu^-\phi$, respectively

Branching fraction

10.48550/arxiv.2305.04759

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Search for a pentaquark state decaying into $pJ/\psi$ in $\Upsilon(1,2S)$ inclusive decays at Belle

arXiv (Cornell University) (2024)

Belle Collaboration X. Dong H. Y. Zhang X. L. Wang I. Adachi

Using the data samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events collected by the Belle detector, we search for a pentaquark state in the $pJ/\psi$ final state from $\Upsilon(1,2S)$ inclusive decays. Here, the charge-conjugate $\bar{p}J/\psi$ is included. We observe clear $pJ/\psi$ production in $\Upsilon(1,2S)$ decays and measure the branching fractions to be $\mathcal{B}[\Upsilon(1S) \to pJ/\psi + anything] = [4.27 \pm 0.16(stat.) \pm 0.20(syst.)] \times 10^{-5}$ and $\mathcal{B}[\Upsilon(2S) \to pJ/\psi + anything] = [3.59 \pm 0.14(stat.) \pm 0.16(syst.)] \times 10^{-5}$. We also measure the cross section of inclusive $pJ/\psi$ production in $e^+e^-$ annihilation to be $\sigma(e^+e^- \to pJ/\psi + anything) = [57.5 \pm 2.1 (stat.) \pm 2.5(syst.)]$~fb at $\sqrt{s} = 10.52~\hbox{GeV}$ using an 89.5~fb$^{-1}$ continuum data sample. There is no significant $P_c(4312)^+$, $P_c(4440)^+$ or $P_c(4457)^+$ signal found in the $pJ/\psi$ final states in $\Upsilon(1,2S)$ inclusive decays. We determine the upper limits of $\mathcal{B}[\Upsilon(1,2S)\to P_c^{+} + anything] \cdot \mathcal{B}(P_c^{+}\to pJ/\psi)$ to be at the $10^{-6}$ level.

Pentaquark

10.48550/arxiv.2403.04340

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Studies ofCPViolation inB→J/ψK*Decays

Physical Review Letters (2005)

R. Itoh Y. Onuki K. Abe K. Abe I. Adachi

CP violation in B→J/ψK∗ decays is studied using an angular analysis in a data sample of 253 fb−1 recorded with the Belle detector at the KEKB e+e− collider. The flavor separated measurements of the decay amplitudes indicate no evidence for direct CP violation. T-odd CP violation is studied using the asymmetries in triple product correlations, and the results are consistent with the standard model null predictions. The time-dependent angular analysis gives the following values of CP-violating parameters: sin2ϕ1=0.24±0.31±0.05 and cos2ϕ1=0.56±0.79±0.11.Received 17 April 2005DOI:https://doi.org/10.1103/PhysRevLett.95.091601©2005 American Physical Society

KEKB

CP violation

Electron–positron annihilation

10.1103/physrevlett.95.091601

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Citations (64)