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First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data

https://doi.org/10.1103/PhysRevLett.134.011801

Abe, K; Abe, S; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; et al (January 2025, Physical Review Letters)

The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of $19.7 (16.3) \times 10^{20}$ protons on target in (anti)neutrino mode, the analysis finds a $1.9 σ$ exclusion of $C P$ conservation (defined as $J_{C P} = 0$ ) and a $1.2 σ$ exclusion of the inverted mass ordering. Published by the American Physical Society2025
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Free, publicly-accessible full text available January 1, 2026
Measurement of $C P$ asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays at Belle II

https://doi.org/10.1103/PhysRevD.109.112020

Adachi, I; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Atmacan, H; Aushev, T; et al (June 2024, Physical Review D)

We report a measurement of decay-time-dependent charge-parity ( $C P$ ) asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays. We use $387 \times 10^{6}$ $B \bar{B}$ pairs collected at the $ϒ (4 S)$ resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the $C P$ -violating parameters $S$ and $C$ from a fit to the distribution of the decay-time difference between the two $B$ mesons. The resulting confidence region is consistent with previous measurements in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ and $B^{0} \to (c \bar{c}) K^{0}$ decays and with predictions based on the standard model. Published by the American Physical Society2024
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Measurement of branching fractions and direct $C P$ asymmetries for $B \to K π$ and $B \to π π$ decays at Belle II

https://doi.org/10.1103/PhysRevD.109.012001

Adachi, I; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Atmacan, H; Aushev, T; et al (January 2024, Physical Review D)

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Measurement of $C P$ asymmetries in $B^{0} \to ϕ K_{s}^{0}$ decays with Belle II

https://doi.org/10.1103/PhysRevD.108.072012

Adachi, I; Adamczyk, K; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Atmacan, H; et al (October 2023, Physical Review D)

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Search for an Invisible $Z^{'}$ in a Final State with Two Muons and Missing Energy at Belle II

https://doi.org/10.1103/PhysRevLett.130.231801

Adachi, I; Adamczyk, K; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Aushev, T; et al (June 2023, Physical Review Letters)

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Search for a $τ^{+} τ^{-}$ Resonance in $e^{+} e^{-} \to μ^{+} μ^{-} τ^{+} τ^{-}$ Events with the Belle II Experiment

https://doi.org/10.1103/PhysRevLett.131.121802

Adachi, I; Adamczyk, K; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Atmacan, H; et al (September 2023, Physical Review Letters)

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Observation of $e^{+} e^{-} \to ω χ_{b J} (1 P)$ and Search for $X_{b} \to ω ϒ (1 S)$ at $\sqrt{s}$ near 10.75 GeV

https://doi.org/10.1103/PhysRevLett.130.091902

Adachi, I.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Aushev, T.; Aushev, V.; et al (March 2023, Physical Review Letters)

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Measurement of the $B^{0}$ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019–2021 Belle II data

https://doi.org/10.1103/PhysRevD.107.L091102

Abudinén, F.; Adachi, I.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; et al (May 2023, Physical Review D)

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Search for Lepton-Flavor-Violating $τ$ Decays to a Lepton and an Invisible Boson at Belle II

https://doi.org/10.1103/PhysRevLett.130.181803

Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Aushev, T.; et al (May 2023, Physical Review Letters)

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Measurement of the branching fraction and $C P$ asymmetry of $B^{0} \to π^{0} π^{0}$ decays using $198 \times 1 0^{6}$ $B \bar{B}$ pairs in Belle II data

https://doi.org/10.1103/PhysRevD.107.112009

Abudinén, F; Adachi, I; Adamczyk, K; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; et al (June 2023, Physical Review D)

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