Publications by Felix Keil

2026

Abumusabh, M., Adachi, I., Adamczyk, K., et al. (2026). Measurement of inclusive <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>B</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:msub> <mml:mi>X</mml:mi> <mml:mi>u</mml:mi> </mml:msub> <mml:mo>ℓ</mml:mo> <mml:mi>ν</mml:mi> </mml:math> partial branching fractions and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mo stretchy="false">|</mml:mo> <mml:msub> <mml:mi>V</mml:mi> <mml:mrow> <mml:mi>u</mml:mi> <mml:mi>b</mml:mi> </mml:mrow> </mml:msub> <mml:mo stretchy="false">|</mml:mo> </mml:math> at Belle II. Physical Review D, 113(3). DOI

Abumusabh, M., Adachi, I., Aggarwal, L., et al. (2026). Measurement of time-dependent CP asymmetries in $${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $$ decays at Belle and Belle II. Journal of High Energy Physics, 2026(1). DOI

2025

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Search for the lepton-flavor-violating τ- → e∓ℓ±ℓ- decays at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 12. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Search for an axion-like particle in B → K(*)a(→ γγ) decays at Belle. JOURNAL OF HIGH ENERGY PHYSICS, 12. DOI Author/Publisher URL

Wilhelm, L., Sfienti, C., Sfienti, C. (2025). Beam-Normal Single-Spin Asymmetry in 208Pb at Low Energy: Discrepancy Resolved or New Kinematic Puzzle?. PHYSICAL REVIEW LETTERS, 135(23). DOI Author/Publisher URL

Abumusabh, M., Adachi, I., Aggarwal, L., et al. (2025). Model-agnostic likelihood for the reinterpretation of the B+→ K+ ν(ν)over-bar measurement at Belle II. PHYSICAL REVIEW D, 112(9). DOI Author/Publisher URL

Adachi, I., Ahmed, H., Ahn, Y., et al. (2025). Charged-hadron identification at Belle II. EUROPEAN PHYSICAL JOURNAL C, 85(11). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the D0 → K- π+ e+ e- branching fraction and search for D0 → π+ π- e+ e- and D0 → K+ K- e + e - decays at Belle. PHYSICAL REVIEW D, 112(7). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2025). Search for B0 → K*0τ+τ- Decays at the Belle II Experiment. PHYSICAL REVIEW LETTERS, 135(15). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment. PHYSICAL REVIEW LETTERS, 135(13). DOI Author/Publisher URL

Abumusabh, M., Adachi, I., Aggarwal, L., et al. (2025). Observation of the decays B+ → Σc(2455)++(Ξ)over-barc- and B0 → Σc (2455)0(Ξ)over-barc0. PHYSICAL REVIEW D, 112(5). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of B → K*(892)γ decays at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 9. DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2025). Test of lepton flavor universality with measurements of R(D+) and R(D* plus ) using semileptonic B tagging at the Belle II experiment. PHYSICAL REVIEW D, 112(3). DOI Author/Publisher URL

Adachi, I., Ahn, J. K., Ahn, Y., et al. (2025). Measurements of the branching fractions of Ξ plus c → Σ+K0S, Ξ+c → Ξ0π+, and Ξ plus c → Ξ0K+at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 8. DOI Author/Publisher URL

Adachi, I., Ahn, Y., Aihara, H., et al. (2025). Search for lepton flavor-violating decay modes B0→ K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 8. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Search for lepton-flavor-violating τ- → l-Ks0 decays at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 8. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the CP asymmetry in D+ → π+π0 decays at Belle II. PHYSICAL REVIEW D, 112(3). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2025). Search for Lepton-Flavor-Violating Decay Modes B0 → KS0τ∓ l± with Hadronic B Tagging at Belle and Belle II. PHYSICAL REVIEW LETTERS, 135(4). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Search for Pc(c)over-bars (4459)0 and Pc(c)over-bars (4338)0 in Υ(1S, 2S) Inclusive Decays at Belle. PHYSICAL REVIEW LETTERS, 135(4). DOI Author/Publisher URL

Adachi, I., Ahn, Y., Akopov, N., et al. (2025). Measurement of the time-integrated CP asymmetry in D0 → KS0 KS0 decays using opposite-side flavor tagging at Belle and Belle II. PHYSICAL REVIEW D, 112(1). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the branching fraction of Λc+ → pKS0π0 at Belle. PHYSICAL REVIEW D, 112(1). DOI Author/Publisher URL

Adachi, I., Ahn, Y., Akopov, N., et al. (2025). Measurement of the time-integrated CP asymmetry in D0 → π0π0 decays at Belle II. PHYSICAL REVIEW D, 112(1). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Model-independent measurement of D0-(D)over-bar0 mixing parameters in D0 → KS0π+π- decays at Belle and Belle II. PHYSICAL REVIEW D, 111(11). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2025). Determination of |Vub| from simultaneous measurements of untagged B0 → π- l+ νl and B+ → ρ0l+ νl decays. PHYSICAL REVIEW D, 111(11). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in B0 → ρ+ρ- decays and constraint on the CKM angle φ2. PHYSICAL REVIEW D, 111(9). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2025). Measurement of branching fractions, CP asymmetry, and isospin asymmetry for B → ργ decays using Belle and Belle II data. PHYSICAL REVIEW D, 111(7). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the branching fraction and CP-violating asymmetry of the decay B0 → π0π0 using 387 million Γ(4S) decays in Belle II data. PHYSICAL REVIEW D, 111(7). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the inclusive branching fractions for Bs0 decays into D mesons via hadronic tagging. JOURNAL OF HIGH ENERGY PHYSICS, 4. DOI Author/Publisher URL

Aggarwal, L., Ahmed, H., Aihara, H., et al. (2025). Search for CP violation in D(s)+ → KS0K-π+π+ decays using triple and quadruple products. JOURNAL OF HIGH ENERGY PHYSICS, 4. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Akopov, N., et al. (2025). Observations of the singly Cabibbo-suppressed decays Ξc+ → pKS0, Ξc+ → Λπ+, and Ξc+ →Σ0π+ at Belle and Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 3. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Observation of the decay B0 → J/ψω at Belle II. PHYSICAL REVIEW D, 111(3). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of the time-integrated CP asymmetry in D0 → KS0KS0 decays using Belle and Belle II data. PHYSICAL REVIEW D, 111(1). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Observation of time-dependent CP violation and measurement of the branching fraction of B0 → J/ψπ0 decays. PHYSICAL REVIEW D, 111(1). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2025). Measurement of CP Asymmetries in B0 → K0Sπ0γ Decays at Belle II. PHYSICAL REVIEW LETTERS, 134(1). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2025). Determination of |Vcb| using B → Dlνl decays at Belle II. PHYSICAL REVIEW D, 112(11). DOI Author/Publisher URL

2024

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Measurement of the e+ e- → π+ π- π0 cross section in the energy range 0.62-3.50 GeV at Belle II. PHYSICAL REVIEW D, 110(11). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). Search for the baryon number and lepton number violating ecays τ- → Λπ- and τ- → (Λ)over-barπ- at Belle II. PHYSICAL REVIEW D, 110(11). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). Measurement of CP asymmetries in B0 → η′KS0 decays at Belle II. PHYSICAL REVIEW D, 110(11). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2024). Test of lepton flavor universality with a measurement of R(D*) using hadronic B tagging at the Belle II experiment. PHYSICAL REVIEW D, 110(7). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Determination of the CKM angle φ3 from a combination of Belle and Belle II results. JOURNAL OF HIGH ENERGY PHYSICS, 10. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Search for lepton-flavor-violating τ-→ μ-μ+μ- decays at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 9. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Search for Rare b → dl+ l- Transitions at Belle. PHYSICAL REVIEW LETTERS, 133(10). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Measurement of the branching fractions of (B)over-bar → D(*)K-K(*)0(S) and (B)over-bar → D(*)D-s decays at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 8. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Search for the decay B0 → γγ using Belle and Belle II data. PHYSICAL REVIEW D, 110(3). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). Study of Γ(10753) decays to π+π- Γ(nS) final states at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 7. DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). New graph-neural-network flavor tagger for Belle II and measurement of sin 2⁢𝜙₁ in 𝐵⁰→𝐽/𝜓⁢𝐾⁰S decays. Physical Review D, 110(1). DOI

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). Measurement of CP asymmetries in B0 → KS0KS0KS0 decays at Belle II. PHYSICAL REVIEW D, 109(11). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2024). Measurement of the branching fraction of the decay B- → D0ρ(770)- at Belle II. PHYSICAL REVIEW D, 109(11). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2024). Search for a μ+ μ- resonance in four-muon final states at Belle II. PHYSICAL REVIEW D, 109(11). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2024). Evidence for 𝐵⁺→𝐾⁺⁢𝜈⁢ ¯𝜈 decays. Physical Review D, 109(11). DOI

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). Search for the e+ e- → ηb (1S)ω and e+ e- → χb0(1P)ω processes at √s=10.745 GeV. PHYSICAL REVIEW D, 109(7). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2024). Measurement of branching fractions and direct CP asymmetries for B→Kπ and B→ππ decays at Belle II. Physical Review D, 109(1). DOI

2023

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2023). Search for a long-lived spin-0 mediator in b→s transitions at the Belle II experiment. Physical Review D, 108(11). DOI

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2023). Determination of |Vcb| using ¯B0→D*+ℓ−¯νℓ decays with Belle II. Physical Review D, 108(9). DOI

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2023). Tests of Light-Lepton Universality in Angular Asymmetries of B0 → D*- lv Decays. PHYSICAL REVIEW LETTERS, 131(18). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2023). Precise Measurement of the Ds plus Lifetime at Belle II. PHYSICAL REVIEW LETTERS, 131(17). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2023). Measurement of CP asymmetries in B0 → φKs0 decays with Belle II. PHYSICAL REVIEW D, 108(7). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2023). Search for a ι+ ι - Resonance in e + e - → μ+ μ - ι+ ι - Events with the Belle II Experiment. PHYSICAL REVIEW LETTERS, 131(12). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Aihara, H., et al. (2023). Measurement of CP asymmetries and branching-fraction ratios for B±→DK± and Dπ± with D→KS0K±π∓ using Belle and Belle II data. JOURNAL OF HIGH ENERGY PHYSICS, 9. DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2023). Measurement of CP Violation in B0 → KS0π0 Decays at Belle II. PHYSICAL REVIEW LETTERS, 131(11). DOI Author/Publisher URL

Adachi, I., Adamczyk, K., Aggarwal, L., et al. (2023). Measurement of the τ-lepton mass with the Belle II experiment. PHYSICAL REVIEW D, 108(3). DOI Author/Publisher URL

Adachi, I., Aggarwal, L., Ahmed, H., et al. (2023). Novel method for the identification of the production flavor of neutral charmed mesons. PHYSICAL REVIEW D, 107(11). DOI Author/Publisher URL