Model-independent reinterpretation of Belle II B+ → K+ νν̄ data using public kinematic mapping yields a factor-of-nine improvement on the limit for B+ → K+ a and constrains the axion's b-s flavor-changing coupling.
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Belle II Technical Design Report
19 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase the luminosity by two orders of magnitude during a three-year shutdown, with an ultimate goal of 8E35 /cm^2 /s luminosity. To exploit the increased luminosity, an upgrade of the Belle detector has been proposed. A new international collaboration Belle-II, is being formed. The Technical Design Report presents physics motivation, basic methods of the accelerator upgrade, as well as key improvements of the detector.
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A general technique incorporates CPT-violating operators of arbitrary mass dimension from effective field theory into neutral-meson oscillation formalism, enabling first measurements of dimension-five operators from existing experiments.
Belle and Belle II present results on b to s lepton-pair and b to s neutrino-pair decays, including reinterpretation of B+ to K+ nu nu-bar and the first inclusive B to X_s nu nu-bar measurement.
This work provides a comprehensive analysis of light new physics contributions to tau lepton dipole moments, detailing interpretations of asymmetry measurements for spin-0 and spin-1 bosons, their decoupling to the EFT limit, and a case study of a tauphilic vector boson at Belle II.
Belle II sets upper limits between 1.3 and 2.5 times 10 to the minus 8 on branching fractions for four tau to e l l decay modes at 90 percent confidence level, the most stringent to date for four modes.
First Belle II results on B lifetimes and mixing from commissioning data of 0.5 fb^{-1}.
Graph neural networks can identify and remove unwanted beam background depositions in the Belle II calorimeter to improve hadronic clustering and reduce fake photon clusters.
A new diagnostic creates per-wire efficiency plots for the Belle II CDC by extrapolating helix reference tracks and measuring the fraction of expected crossings with associated hits.
Multi-face 4S SiPM readout on scintillators achieves 68 ps TOF resolution and measures cosmic muon velocity.
GraphPT, a U-Net-style graph neural network with attention, improves K/π separation power by 10-20% over the truncated mean method for dN/dx-based PID in the 5-20 GeV/c range.
Belle II sets 90% CL upper limits on the Born cross sections for e+e−→γχbJ near √s=10.746 GeV, with those for χb1 being significantly smaller than for ωχb1 and π+π−Υ(2S).
Measurements of b to s lepton-pair, tau-pair, and neutrino-pair decays presented from Belle and Belle II datasets.
STCF with 1 ab^{-1} can probe several-TeV new-physics scales in sterile-neutrino EFT and constrain an RPV SUSY parameter to ~0.1 TeV^{-2} for apparent BNV in unexplored Lambda_c+ channels.
Improved cross-section measurements reveal Υ(10753) decays to χ_bJ ω but not non-ω three-pion states, while Υ(10860) shows the reverse pattern, plus updated mass 10756.1 ± 3.4 ± 2.7 MeV and width 32.2 ± 11.3 ± 14.9 MeV for Υ(10753).
Proposal to add polarized electron beams to SuperKEKB for left-right asymmetry measurements of electroweak parameters including sin²θ_W at the Υ(4S) resonance.
Belle II proposes a DMAPS-based vertex detector upgrade with the OBELIX chip targeting 6e35 cm^-2 s^-1 luminosity, 120 MHz/cm2 hit rates, and radiation tolerance to 5e14 neq/cm2.
Early Belle II data validates reconstruction of CP-violation channels and supplies sensitivity estimates for φ1/β and φ2/α with the full dataset.
Early Belle II commissioning data is used to re-measure standard B to X lepton neutrino and B to D* lepton neutrino decays and to evaluate machine learning tagging algorithms for future lepton flavor universality tests.
Belle II at SuperKEKB offers prospects for exploring dozens of exotic XYZ quarkonium states with substantially increased luminosity and data volume.
citing papers explorer
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The $B^+ \to K^+ \nu \bar \nu$ decay as a search for the QCD axion
Model-independent reinterpretation of Belle II B+ → K+ νν̄ data using public kinematic mapping yields a factor-of-nine improvement on the limit for B+ → K+ a and constrains the axion's b-s flavor-changing coupling.
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Searching for CPT Violation with Neutral-Meson Oscillations
A general technique incorporates CPT-violating operators of arbitrary mass dimension from effective field theory into neutral-meson oscillation formalism, enabling first measurements of dimension-five operators from existing experiments.
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$b\to s\ell^+\ell^- (\ell = e, \mu, \tau)$ and $b\to s\nu\bar\nu$ at Belle and Belle II
Belle and Belle II present results on b to s lepton-pair and b to s neutrino-pair decays, including reinterpretation of B+ to K+ nu nu-bar and the first inclusive B to X_s nu nu-bar measurement.
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Light new physics and the $\tau$ lepton dipole moments
This work provides a comprehensive analysis of light new physics contributions to tau lepton dipole moments, detailing interpretations of asymmetry measurements for spin-0 and spin-1 bosons, their decoupling to the EFT limit, and a case study of a tauphilic vector boson at Belle II.
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Search for the lepton-flavor-violating $\tau^{-} \rightarrow e^{\mp} \ell^{\pm} \ell^{\mp}$ decays at Belle II
Belle II sets upper limits between 1.3 and 2.5 times 10 to the minus 8 on branching fractions for four tau to e l l decay modes at 90 percent confidence level, the most stringent to date for four modes.
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B lifetime and $B^0-\bar B^0$ mixing results from early Belle II data
First Belle II results on B lifetimes and mixing from commissioning data of 0.5 fb^{-1}.
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Using Graph Neural Networks for hadronic clustering and to reduce beam background in the Belle~II electromagnetic calorimeter
Graph neural networks can identify and remove unwanted beam background depositions in the Belle II calorimeter to improve hadronic clustering and reduce fake photon clusters.
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Wire-by-Wire Tracking Efficiency Plots: A New Diagnostic for the Belle~II Central Drift Chamber
A new diagnostic creates per-wire efficiency plots for the Belle II CDC by extrapolating helix reference tracks and measuring the fraction of expected crossings with associated hits.
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Development of a sub-100 ps Time-of-Flight detector with SiPM-readout scintillator for measurement of cosmic muon velocity
Multi-face 4S SiPM readout on scintillators achieves 68 ps TOF resolution and measures cosmic muon velocity.
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dN/dx Reconstruction with Deep Learning for High-Granularity TPCs
GraphPT, a U-Net-style graph neural network with attention, improves K/π separation power by 10-20% over the truncated mean method for dN/dx-based PID in the 5-20 GeV/c range.
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Search for $e^+ e^- \to \gamma\chi_{bJ}$ ($J$ = 0, 1, 2) near $\sqrt{s} = 10.746$ GeV at Belle II
Belle II sets 90% CL upper limits on the Born cross sections for e+e−→γχbJ near √s=10.746 GeV, with those for χb1 being significantly smaller than for ωχb1 and π+π−Υ(2S).
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Measurements of electroweak penguins and $B$ decays to final states with missing energy at Belle and Belle II
Measurements of b to s lepton-pair, tau-pair, and neutrino-pair decays presented from Belle and Belle II datasets.
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Searching for apparent baryon number violation in $\Lambda_c^+$ decays at the Super Tau-Charm Facility
STCF with 1 ab^{-1} can probe several-TeV new-physics scales in sterile-neutrino EFT and constrain an RPV SUSY parameter to ~0.1 TeV^{-2} for apparent BNV in unexplored Lambda_c+ channels.
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Improved measurement of Born cross sections for $\chi_{bJ}\,\omega$ and $\chi_{bJ}\,(\pi^+\pi^-\pi^0)_{\rm non-\omega}$ ($J$ = 0, 1, 2) at Belle and Belle II
Improved cross-section measurements reveal Υ(10753) decays to χ_bJ ω but not non-ω three-pion states, while Υ(10860) shows the reverse pattern, plus updated mass 10756.1 ± 3.4 ± 2.7 MeV and width 32.2 ± 11.3 ± 14.9 MeV for Υ(10753).
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Electroweak Physics with Polarized Electron Beams in a SuperKEKB Upgrade
Proposal to add polarized electron beams to SuperKEKB for left-right asymmetry measurements of electroweak parameters including sin²θ_W at the Υ(4S) resonance.
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Upgrade of the Belle II Vertex Detector with Depleted Monolithic CMOS Active Pixel Sensors
Belle II proposes a DMAPS-based vertex detector upgrade with the OBELIX chip targeting 6e35 cm^-2 s^-1 luminosity, 120 MHz/cm2 hit rates, and radiation tolerance to 5e14 neq/cm2.
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First look at time-dependent CP violation using early Belle II data
Early Belle II data validates reconstruction of CP-violation channels and supplies sensitivity estimates for φ1/β and φ2/α with the full dataset.
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Semileptonic and leptonic B decay results from early Belle II data
Early Belle II commissioning data is used to re-measure standard B to X lepton neutrino and B to D* lepton neutrino decays and to evaluate machine learning tagging algorithms for future lepton flavor universality tests.
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Exotic quarkonium physics prospects at Belle II
Belle II at SuperKEKB offers prospects for exploring dozens of exotic XYZ quarkonium states with substantially increased luminosity and data volume.