P. Kodyš
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View article: Belle II Vertex Detector: Run Performance (PXD + SVD) and Upgrade Developments (VTX)
Belle II Vertex Detector: Run Performance (PXD + SVD) and Upgrade Developments (VTX) Open
The Belle II experiment at SuperKEKB continues to pursue high-precision measurements in Standard Model studies and in searches for physics beyond the Standard Model, with a target dataset of 50 ab$^{-1}$ and peak luminosities of $6\times10…
View article: Search for a pentaquark state decaying into pJ/ψ in Υ(1, 2S) inclusive decays at Belle
Search for a pentaquark state decaying into pJ/ψ in Υ(1, 2S) inclusive decays at Belle Open
A bstract Using the data samples of 102 million Υ(1 S ) and 158 million Υ(2 S ) events collected by the Belle detector, we search for a pentaquark state in the pJ/ψ final state from Υ(1 , 2 S ) inclusive decays. Here, the charge-conjugate …
View article: Search for lepton-flavor-violating tau decays to ℓα at Belle
Search for lepton-flavor-violating tau decays to ℓα at Belle Open
A bstract We report a search for the lepton-flavor-violating decays τ ± → ℓ ± α ( ℓ = e , μ ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 10 6 tau lepton pairs collected by the Belle detector at th…
View article: The Silicon Vertex Detector of the Belle II Experiment
The Silicon Vertex Detector of the Belle II Experiment Open
International audience
View article: Production cross sections of light and charmed mesons in $e^+e^-$ annihilation near 10.58 GeV
Production cross sections of light and charmed mesons in $e^+e^-$ annihilation near 10.58 GeV Open
We report measurements of production cross sections for $ρ^+$, $ρ^0$, $ω$, $K^{*+}$, $K^{*0}$, $ϕ$, $η$, $K_S^0$, $f_0(980)$, $D^+$, $D^0$, $D_s^+$, $D^{*+}$, $D^{*0}$, and $D^{*+}_s$ in $e^+e^-$ collisions at a center-of-mass energy near …
View article: Search for $h_b(2P)\toγχ_{bJ}(1P)$ at $\sqrt{s} = 10.860$ GeV
Search for $h_b(2P)\toγχ_{bJ}(1P)$ at $\sqrt{s} = 10.860$ GeV Open
In the bottomonium sector, the hindered magnetic dipole (M1) transitions between P-wave states $h_b(2P) \rightarrow χ_{bJ}(1P) γ$, $J=0, \, 1, \, 2$, are expected to be severely suppressed according to the Relativized Quark Model, due to t…
View article: The Silicon Vertex Detector of the Belle II Experiment
The Silicon Vertex Detector of the Belle II Experiment Open
International audience
View article: Search for charmed baryons in the $Λ_c^+η$ system and measurement of the branching fractions of $Λ_c(2880)^+$ and $Λ_c(2940)^+$ decaying to $Λ_c^+η$ and $pD^0$ relative to $Σ_c(2455)π$
Search for charmed baryons in the $Λ_c^+η$ system and measurement of the branching fractions of $Λ_c(2880)^+$ and $Λ_c(2940)^+$ decaying to $Λ_c^+η$ and $pD^0$ relative to $Σ_c(2455)π$ Open
We search for excited charmed baryons in the $Λ_c^+η$ system using a data sample corresponding to an integrated luminosity of 980 $\rm fb^{-1}$. The data were collected by the Belle detector at the KEKB $e^{+}$$e^{-}$ asymmetric-energy col…
View article: Search for a heavy neutral lepton that mixes predominantly with the tau neutrino
Search for a heavy neutral lepton that mixes predominantly with the tau neutrino Open
We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e− collider. The data sample was collected at and just below t…
View article: The Belle II Pixel Vertex Detector
The Belle II Pixel Vertex Detector Open
The Belle II experiment at the SuperKEKB $e^{+}e^{-}$ collider took data from 2019 to 2022 (Run 1) and is currently undergoing its planned first long shutdown (LS1). During its operational period, SuperKEKB achieved a record-breaking insta…
View article: Angular analysis of $B \to K^* e^+ e^-$ in the low-$q^2$ region with new electron identification at Belle
Angular analysis of $B \to K^* e^+ e^-$ in the low-$q^2$ region with new electron identification at Belle Open
We perform an angular analysis of the $B\to K^* e^+ e^-$ decay for the dielectron mass squared, $q^2$, range of $0.0008$ to $1.1200 ~\text{GeV}^2 /c^4$ using the full Belle data set in the $K^{*0} \to K^+ π^-$ and $K^{*+} \to K_S^0 π^+$ ch…
View article: Search for a pentaquark state decaying into $pJ/ψ$ in $Υ(1,2S)$ inclusive decays at Belle
Search for a pentaquark state decaying into $pJ/ψ$ in $Υ(1,2S)$ inclusive decays at Belle Open
Using the data samples of 102 million $Υ(1S)$ and 158 million $Υ(2S)$ events collected by the Belle detector, we search for a pentaquark state in the $pJ/ψ$ final state from $Υ(1,2S)$ inclusive decays. Here, the charge-conjugate $\bar{p}J/…
View article: Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle
Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle Open
A bstract We report a search for the charged-lepton flavor violation in Υ(2 S ) → ℓ ∓ τ ± ( ℓ = e, μ ) decays using a 25 fb − 1 Υ(2 S ) sample collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. We find no evide…
View article: Silicon vertex detector of the Belle II experiment
Silicon vertex detector of the Belle II experiment Open
The silicon vertex detector (SVD) is installed at the heart of the Belle II experiment, taking data at the high-luminosity B-Factory SuperKEKB since 2019. The SVD is a four-layer double-sided strip detector with tracking and particle-ident…
View article: Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State
Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State Open
We report the results of the first search for $B^-$ decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ final state using 711~${\rm fb^{-1}}$ of data collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-…
View article: Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow ωω$
Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow ωω$ Open
We present a measurement of $B^{0} \rightarrow ωω$, a charmless decay into two vector mesons, using 772 $\times 10^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. The decay is observed with a signi…
View article: Silicon Vertex Detector of the Belle II Experiment
Silicon Vertex Detector of the Belle II Experiment Open
The silicon vertex detector (SVD) is installed at the heart of the Belle II experiment, taking data at the high-luminosity $B$-Factory SuperKEKB since 2019. The detector has shown a stable and above-99\% hit efficiency, with a large signal…
View article: Search for the semileptonic decays $Ξ_c^0 \to Ξ^0\ell^+\ell^-$ at Belle
Search for the semileptonic decays $Ξ_c^0 \to Ξ^0\ell^+\ell^-$ at Belle Open
Using the full data sample of 980 $\mathrm{fb}^{-1}$ collected with the Belle detector at the KEKB asymmetric energy electron-positron collider, we report the results of the first search for the rare semileptonic decays $Ξ_c^0 \to Ξ^0\ell^…
View article: Search for a Heavy Neutrino in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi></mml:math> Decays at Belle
Search for a Heavy Neutrino in Decays at Belle Open
We report on a search for a heavy Majorana neutrino in the decays τ^{-}→π^{-}ν_{h}, ν_{h}→π^{±}l^{∓}, l=e, μ. The results are obtained using the full data sample of 988 fb^{-1} collected with the Belle detector at the KEKB asymmetric energ…
View article: Search for the decay $B_s^0\to J/ψπ^0$ at Belle experiment
Search for the decay $B_s^0\to J/ψπ^0$ at Belle experiment Open
We have analyzed 121.4 fb$^{-1}$ of data collected at the $Υ(5S)$ resonance by the Belle experiment using the KEKB asymmetric-energy $e^+e^-$ collider to search for the decay $B_s^0\to J/ψπ^0$. We observe no signal and report an upper limi…
View article: Measurement of Angular Coefficients of $\bar{B} \to D^* \ell \barν_\ell$: Implications for $|V_{cb}|$ and Tests of Lepton Flavor Universality
Measurement of Angular Coefficients of $\bar{B} \to D^* \ell \barν_\ell$: Implications for $|V_{cb}|$ and Tests of Lepton Flavor Universality Open
We measure the complete set of angular coefficients $J_i$ for exclusive $\bar{B} \to D^* \ell \barν_\ell$ decays ($\ell = e, μ$). Our analysis uses the full $711\,\mathrm{fb}^{-1}$ Belle data set with hadronic tag-side reconstruction. The …
View article: Search for charged-lepton flavor violation in $Υ(2S) \to \ell^\mpτ^\pm$ ($\ell=e,μ$) decays at Belle
Search for charged-lepton flavor violation in $Υ(2S) \to \ell^\mpτ^\pm$ ($\ell=e,μ$) decays at Belle Open
We report a search for the charged-lepton flavor violation in $Υ(2S) \to \ell^\mpτ^\pm$ ($\ell=e,μ$) decays using a $25~\fbi$ $Υ(2S)$ sample collected by the Belle detector at the KEKB $e^{+}$$e^-$ asymmetric-energy collider. We find no ev…
View article: Observation of charmed strange meson pair production in $Υ(2S)$ decays and in $e^{+}e^{-}$ annihilation at $\sqrt{s} = 10.52~ \rm{GeV}$
Observation of charmed strange meson pair production in $Υ(2S)$ decays and in $e^{+}e^{-}$ annihilation at $\sqrt{s} = 10.52~ \rm{GeV}$ Open
We observe the process $Υ(2S)\to D_s^{(*)+} D_{sJ}^{-}$ and continuum production $e^+e^- \to D_s^{(*)+} D_{sJ}^- $ at $\sqrt{s} = 10.52$ GeV (and their charge conjugates) using the data samples collected by the Belle detector at KEKB, wher…
View article: Evidence for $B^0 \to p\barΣ^0π^-$ at Belle
Evidence for $B^0 \to p\barΣ^0π^-$ at Belle Open
We search for the $B^0\to p\barΣ^0π^-$ decay with $\barΣ^0 \to \barΛγ$, where the $γ$ is not measured, using a data sample corresponding to an integrated luminosity of 711 $\rm{fb^{-1}}$ which contains 772 $\times$ $10^{6}$ $B\bar{B}$ pair…
View article: Search for the double-charmonium state with $η_c J/ψ$ at Belle
Search for the double-charmonium state with $η_c J/ψ$ at Belle Open
We measure the cross section of $e^+e^-\rightarrowη_c J/ψ$ at the $Υ(nS) (n=1$ -- $5)$ on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of $955~…
View article: Search for $C\!P$ violation using $T$-odd correlations in $D_{(s)}^{+}\to K^{+} K^{-}π^{+}π^{0}$, $D_{(s)}^{+}\to K^{+} π^{-}π^{+}π^{0}$, and $D^{+}\to K^{-}π^{+}π^{+}π^{0}$ decays
Search for $C\!P$ violation using $T$-odd correlations in $D_{(s)}^{+}\to K^{+} K^{-}π^{+}π^{0}$, $D_{(s)}^{+}\to K^{+} π^{-}π^{+}π^{0}$, and $D^{+}\to K^{-}π^{+}π^{+}π^{0}$ decays Open
We search for $C\!P$ violation using $T$-odd correlations in five $D_{(s)}^{+}$ and $D_{(s)}^{-}$ four-body decays. Our analysis is based on 980 $\rm fb^{-1}$ of data collected by the Belle detector at the KEKB energy-asymmetric $e^+e^-$ c…