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Observation of $Ω {(2012)}^{-} \to Ξ (1530) \bar{K}$ and measurement of the effective couplings of Ω(2012)− to $Ξ (1530) \bar{K}$ and $Ξ \bar{K}$

https://doi.org/10.1016/j.physletb.2024.139224

Jia, S; Shen, CP; Yuan, CZ; Ahn, JK; Aihara, H; Asner, DM; Atmacan, H; Ayad, R; Bahinipati, S; Banerjee, Sw; et al (January 2025, Physics Letters B)

Free, publicly-accessible full text available January 1, 2026
Search for two-body $B$ meson decays to $Λ^{0}$ and $Ω_{c}^{(*) 0}$

https://doi.org/10.1103/PhysRevD.110.L031102

Savinov, V; Adachi, I; Ahn, J K; Aihara, H; Asner, D M; Atmacan, H; Ayad, R; Banerjee, Sw; Bennett, J; Bessner, M; et al (August 2024, Physical Review D)

We report the results of the first search for Standard Model and baryon-number-violating two-body decays of the neutral $B$ mesons to $Λ^{0}$ and $Ω_{c}^{(*) 0}$ using $711 {fb}^{- 1}$ of data collected at the $ϒ (4 S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We observe no evidence of signal from any such decays and set 95% confidence-level upper limits on the products of $B^{0}$ and ${\bar{B}}^{0}$ branching fractions for these two-body decays with $B (Ω_{c}^{0} \to π^{+} Ω^{-})$ in the range between $9.5 \times 10^{- 8}$ and $31.2 \times 10^{- 8}$ . Published by the American Physical Society2024
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Search for Baryon-Number-Violating Processes in $B^{-}$ Decays to the ${\bar{Ξ}}_{c}^{0} {\bar{Λ}}_{c}^{-}$ Final State

https://doi.org/10.1103/PhysRevLett.133.071802

Gu, T; Savinov, V; Adachi, I; Aihara, H; Asner, D M; Atmacan, H; Aushev, T; Ayad, R; Banerjee, Sw; Belous, K; et al (August 2024, Physical Review Letters)

We report the results of the first search for $B^{-}$ decays to the ${\bar{Ξ}}_{c}^{0} {\bar{Λ}}_{c}^{-}$ final state using $711 {fb}^{- 1}$ of data collected at the $ϒ (4 S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. The results are interpreted in terms of both direct baryon-number-violating $B^{-}$ decay and $Ξ_{c}^{0} - {\bar{Ξ}}_{c}^{0}$ oscillations which follow the standard model decay $B^{-} \to Ξ_{c}^{0} {\bar{Λ}}_{c}^{-}$ . We observe no evidence for baryon number violation and set the 95% confidence-level upper limits on the ratio of baryon-number-violating and standard model branching fractions $B (B^{-} \to {\bar{Ξ}}_{c}^{0} {\bar{Λ}}_{c}^{-}) / B (B^{-} \to Ξ_{c}^{0} {\bar{Λ}}_{c}^{-})$ to be $< 2.7 %$ and on the effective angular frequency of mixing $ω$ in $Ξ_{c}^{0} - {\bar{Ξ}}_{c}^{0}$ oscillations to be $< 0.76 {ps}^{- 1}$ (equivalent to $τ_{mix} > 1.3 ps$ ). Published by the American Physical Society2024
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Measurements of the Branching Fraction, Polarization, and $C P$ Asymmetry for the Decay $B^{0} \to ω ω$

https://doi.org/10.1103/PhysRevLett.133.081801

Guan, Y; Schwartz, A J; Kinoshita, K; Adachi, I; Aihara, H; Al_Said, S; Asner, D M; Atmacan, H; Ayad, R; Bahinipati, S; et al (August 2024, Physical Review Letters)

We present a comprehensive study of $B^{0} \to ω ω$ decays using $772 \times 10^{6} B \bar{B}$ pairs collected with the Belle detector at the KEKB $e^{+} e^{-}$ collider. This process is a suppressed charmless decay into two vector mesons and can exhibit interesting polarization and $C P$ violation. The decay is observed for the first time with a significance of 7.9 standard deviations. We measure a branching fraction $B = (1.53 \pm 0.29 \pm 0.17) \times 10^{- 6}$ , a fraction of longitudinal polarization $f_{L} = 0.87 \pm 0.13 \pm 0.13$ , and a time-integrated $C P$ asymmetry $A_{C P} = - 0.44 \pm 0.43 \pm 0.11$ , where the first uncertainties listed are statistical and the second are systematic. This is the first observation of $B^{0} \to ω ω$ and the first measurements of $f_{L}$ and $A_{C P}$ for this decay. Published by the American Physical Society2024
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Search for the decay $B_{s}^{0} \to J / ψ π^{0}$ at Belle experiment

https://doi.org/10.1103/PhysRevD.109.032007

Kumar, D; Bhuyan, B; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Babu, V; Banerjee, Sw; Bauer, M; Behera, P; et al (February 2024, Physical Review D)

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First Measurements of Absolute Branching Fractions of the $Ξ_{c}^{0}$ Baryon at Belle

https://doi.org/10.1103/PhysRevLett.122.082001

Li, Y. B.; Shen, C. P.; Yuan, C. Z.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aushev, T.; Ayad, R.; Badhrees, I.; et al (February 2019, Physical Review Letters)

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Search for $B^{0} \to X (3872) γ$

https://doi.org/10.1103/PhysRevD.100.012002

Chou, P.-C.; Chang, P.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; et al (July 2019, Physical Review D)

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Measurement of the branching fraction of $B \to D^{(*)} π ℓ ν$ at Belle using hadronic tagging in fully reconstructed events

https://doi.org/10.1103/PhysRevD.98.012005

Vossen, A.; Adachi, I.; Adamczyk, K.; Aihara, H.; Al Said, S.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Badhrees, I.; et al (July 2018, Physical Review D)

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Search for a Light $C P$ -odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment

https://doi.org/10.1103/PhysRevLett.122.011801

Seong, I. S.; Vahsen, S. E.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; et al (January 2019, Physical Review Letters)

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Observation of $ϒ (4 S) \to η^{'} ϒ (1 S)$

https://doi.org/10.1103/PhysRevLett.121.062001

Guido, E.; Mussa, R.; Tamponi, U.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; et al (August 2018, Physical Review Letters)

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