1. Search for lepton-flavor-violating ▫$\tau^- \to \mu^- \mu^+ \mu^-$▫ decays at Belle IIIchiro Adachi, Jyotirmoi Borah, Marko Bračko, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Manca Mrvar, Rok Pestotnik, Tomaž Podobnik, Marko Starič, Luka Šantelj, Valentina Zhukova, Radek Žlebčík, 2024, izvirni znanstveni članek Povzetek: We present the result of a search for the charged-lepton-flavor violating decay τ− → μ−μ+μ− using a 424 fb−1 sample of data recorded by the Belle II experiment at the SuperKEKB e+e− collider. The selection of e+e− → τ+τ− events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a 90% confidence level upper limit of 1.9 × 10−8 on the branching fraction of the τ− → μ−μ+μ− decay, which is the most stringent bound to date.
Ključne besede: flavour physics, tau physics, e+-e− Experiments
Objavljeno v DiRROS: 22.04.2026; Ogledov: 158; Prenosov: 105
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2. Search for rare ▫$b \to d\ell^+\ell^-$▫ transitions at BelleIchiro Adachi, Jyotirmoi Borah, Marko Bračko, Gaetano de Marino, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Manca Mrvar, Rok Pestotnik, Tomaž Podobnik, Ihor Prudiiev, Marko Starič, Luka Šantelj, Valentina Zhukova, Radek Žlebčík, 2024, izvirni znanstveni članek Ključne besede: Belle II experiment, particle decays
Objavljeno v DiRROS: 20.04.2026; Ogledov: 140; Prenosov: 149
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3. Test of lepton flavor universality with measurements of ▫$R(D^+)$▫ and ▫$R(D^{\ast +})$▫ using semileptonic tagging at the Belle II experimentIchiro Adachi, Karol Adamczyk, Jyotirmoi Borah, Marko Bračko, Anja Novosel, Ihor Prudiiev, Samo Korpar, Peter Križan, Rok Pestotnik, Tomaž Podobnik, Marko Starič, Luka Šantelj, Paul Feichtinger, Eldar Ganiev, Valentina Zhukova, 2025, izvirni znanstveni članek Ključne besede: Belle experiment, decays
Objavljeno v DiRROS: 20.04.2026; Ogledov: 184; Prenosov: 108
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4. Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in ▫$B^0 \to \rho^+ \rho^-$▫ decays and constraint on the CKM angle ▫$\phi_2$▫Ichiro Adachi, Jyotirmoi Borah, Marko Bračko, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Rok Pestotnik, Tomaž Podobnik, Marko Starič, Luka Šantelj, 2025, izvirni znanstveni članek Ključne besede: Belle experiment, decays
Objavljeno v DiRROS: 20.04.2026; Ogledov: 136; Prenosov: 103
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5. Measurement of the branching fraction and ▫$CP$▫-violating asymmetry of the decay ▫$B^0 \to \pi^0 \pi^0$▫ using 387 million ▫$\Upsilon (4S)$▫ decays in Belle II dataIchiro Adachi, Jyotirmoi Borah, Marko Bračko, Gaetano de Marino, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Rok Pestotnik, Ihor Prudiiev, Tomaž Podobnik, Marko Starič, Luka Šantelj, Valentina Zhukova, 2025, izvirni znanstveni članek Ključne besede: Belle experiment, decays
Objavljeno v DiRROS: 20.04.2026; Ogledov: 159; Prenosov: 109
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6. Observation of the decay ▫$B^0 \to J/\psi \omega$▫ at Belle IIIchiro Adachi, Jyotirmoi Borah, Marko Bračko, Gaetano de Marino, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Rok Pestotnik, Ihor Prudiiev, Tomaž Podobnik, Marko Starič, Luka Šantelj, 2025, izvirni znanstveni članek Ključne besede: Belle experiment, decays
Objavljeno v DiRROS: 20.04.2026; Ogledov: 184; Prenosov: 97
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7. Evidence for ▫$B^+ \to K^+ \nu \bar{\nu}$▫ decaysIchiro Adachi, Karol Adamczyk, Jyotirmoi Borah, Marko Bračko, Samo Korpar, Peter Križan, Andrej Lozar, Manca Mrvar, Rok Pestotnik, Tomaž Podobnik, Leonardo B. Rizzuto, Marko Starič, Luka Šantelj, Valentina Zhukova, Paul Feichtinger, Eldar Ganiev, 2024, izvirni znanstveni članek Povzetek: We search for the rare decay �+ →�+� ¯ � in a 362 fb−1 sample of electron-positron collisions at the ϒ(4�) resonance collected with the Belle II detector at the SuperKEKB collider. We use the inclusive properties of the accompanying � meson in ϒ(4�)→� ¯ � events to suppress background from other decays of the signal � candidate and light-quark pair production. We validate the measurement with an auxiliary analysis based on a conventional hadronic reconstruction of the accompanying � meson. For background suppression, we exploit distinct signal features using machine learning methods tuned with simulated data. The signal-reconstruction efficiency and background suppression are validated through various control channels. The branching fraction is extracted in a maximum likelihood fit. Our inclusive and hadronic analyses yield consistent results for the �+ →�+� ¯ � branching fraction of [2.7±0.5(stat)±0.5(syst)] ×10−5 and [1.1+0.9 −0.8(stat)+0.8 −0.5(syst)] ×10−5, respectively. Combining the results, we determine the branching fraction of the decay �+ →�+� ¯ � to be [2.3±0.5(stat)+0.5 −0.4(syst)] ×10−5, providing the first evidence for this decay at 3.5 standard deviations. The combined result is 2.7 standard deviations above the standard model expectation.
Ključne besede: Belle experiment, magnetic spectrometer
Objavljeno v DiRROS: 20.04.2026; Ogledov: 142; Prenosov: 110
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8. Measurement of ▫$CP$▫ asymmetries in ▫$B^0 \to K^0_S\pi^0\gamma$▫ decays at Belle IIIchiro Adachi, Jyotirmoi Borah, Marko Bračko, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Manca Mrvar, Rok Pestotnik, Tomaž Podobnik, Ihor Prudiiev, Marko Starič, Luka Šantelj, Valentina Zhukova, Radek Žlebčík, 2025, izvirni znanstveni članek Ključne besede: Belle II experiment, decays
Objavljeno v DiRROS: 18.02.2026; Ogledov: 400; Prenosov: 215
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9. Search for a dark Higgs boson produced in association with inelastic dark matter at the Belle II ExperimentIchiro Adachi, Jyotirmoi Borah, Marko Bračko, Gaetano de Marino, Paul Feichtinger, Eldar Ganiev, Samo Korpar, Peter Križan, Rok Pestotnik, Tomaž Podobnik, Ihor Prudiiev, Marko Starič, Luka Šantelj, Radek Žlebčík, 2025, izvirni znanstveni članek Ključne besede: Belle II experiment, decays
Objavljeno v DiRROS: 09.02.2026; Ogledov: 567; Prenosov: 200
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