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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 $h_{b} (2 P) \to γ χ_{b J} (1 P)$ at $\sqrt{s} = 10.860 GeV$

https://doi.org/10.1103/PhysRevD.111.L011102

Boschetti, A; Mussa, R; Tamponi, U; Adachi, I; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Banerjee, Sw; Belous, K; et al (January 2025, Physical Review D)

In the bottomonium sector, the hindered magnetic dipole transitions between P-wave states $h_{b} (2 P) \to χ_{b J} (1 P) γ$ , $J = 0$ , 1, 2, are expected to be severely suppressed according to the relativized quark model, due to the spin flip of the $b$ quark. Nevertheless, a recent model following the coupled-channel approach predicts the corresponding branching fractions to be enhanced by orders of magnitude. In this Letter, we report the first search for such transitions. We find no significant signals and set upper limits at 90% confidence level on the corresponding branching fractions: $B [h_{b} (2 P) \to γ χ_{b 0} (1 P)] < 2.7 \times 10^{- 1}$ , $B [h_{b} (2 P) \to γ χ_{b 1} (1 P)] < 5.4 \times 10^{- 3}$ and $B [h_{b} (2 P) \to γ χ_{b 2} (1 P)] < 1.3 \times 10^{- 2}$ . These values help to constrain the parameters of the coupled-channel models. The results are obtained using a $121.4 {fb}^{- 1}$ data sample taken around $\sqrt{s} = 10.860 GeV$ with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. Published by the American Physical Society2025
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Free, publicly-accessible full text available January 1, 2026
Evidence of $h_{b} (2 P) \to ϒ (1 S) η$ Decay and Search for $h_{b} (1 P, 2 P) \to ϒ (1 S) π^{0}$ with the Belle Detector

https://doi.org/10.1103/PhysRevLett.133.261901

Kovalenko, E; Adachi, I; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Babu, V; Banerjee, Sw; Belous, K; Bennett, J; et al (December 2024, Physical Review Letters)

We report the first evidence for the $h_{b} (2 P) \to ϒ (1 S) η$ transition with a significance of 3.5 standard deviations. The decay branching fraction is measured to be $B [h_{b} (2 P) \to ϒ (1 S) η] = ({7.1}_{- 3.2}^{+ 3.7} \pm 0.8) \times 10^{- 3}$ , which is noticeably smaller than expected. We also set upper limits on $π^{0}$ transitions of $B [h_{b} (2 P) \to ϒ (1 S) π^{0}] < 1.8 \times 10^{- 3}$ , and $B [h_{b} (1 P) \to ϒ (1 S) π^{0}] < 1.8 \times 10^{- 3}$ , at the 90% confidence level. These results are obtained with a $131.4 {fb}^{- 1}$ data sample collected near the $ϒ (5 S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. Published by the American Physical Society2024
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Free, publicly-accessible full text available December 1, 2025
Search for charmed baryons in the $Λ_{c}^{+} η$ system and measurement of the branching fractions of $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ decaying to $Λ_{c}^{+} η$ and $p D^{0}$ relative to $Σ_{c} (2455) π$

https://doi.org/10.1103/PhysRevD.110.032021

Li, S X; Shen, C P; Adachi, I; Ahn, J K; Aihara, H; Asner, D M; Atmacan, H; Aushev, T; Ayad, R; Banerjee, Sw; et al (August 2024, Physical Review D)

We search for excited charmed baryons in the $Λ_{c}^{+} η$ system using a data sample corresponding to an integrated luminosity of $980 {fb}^{- 1}$ . The data were collected by the Belle detector at the KEKB $e^{+} e^{-}$ asymmetric-energy collider. No significant signals are found in the $Λ_{c}^{+} η$ mass spectrum, including the known $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ . Clear $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ signals are observed in the $p D^{0}$ mass spectrum. We set upper limits at 90% credibility level on ratios of branching fractions of $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ decaying to $Λ_{c}^{+} η$ relative to $Σ_{c} (2455) π$ of $< 0.13$ for the $Λ_{c} (2880)^{+}$ and $< 1.11$ for the $Λ_{c} (2940)^{+}$ . We measure ratios of branching fractions of $Λ_{c} (2880)^{+}$ and $Λ_{c} (2940)^{+}$ decaying to $p D^{0}$ relative to $Σ_{c} (2455) π$ of $0.75 \pm 0.03 (stat) \pm 0.07 (syst)$ for the $Λ_{c} (2880)^{+}$ and $3.59 \pm 0.21 (stat) \pm 0.56 (syst)$ for the $Λ_{c} (2940)^{+}$ . Published by the American Physical Society2024
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Angular analysis of $B \to K^{*} e^{+} e^{-}$ in the low- $q^{2}$ region with new electron identification at Belle

https://doi.org/10.1103/PhysRevD.110.072005

Ferlewicz, D; Urquijo, P; Adachi, I; Adamczyk, K; Aihara, H; Asner, D M; Atmacan, H; Ayad, R; Babu, V; Banerjee, Sw; et al (October 2024, Physical Review D)

We perform an angular analysis of the $B \to K^{*} e^{+} e^{-}$ decay for the dielectron mass squared, $q^{2}$ , range of $0.0008 - 1.1200 {GeV}^{2} / c^{4}$ using the full Belle dataset in the $K^{* 0} \to K^{+} π^{-}$ and $K^{* +} \to K_{S}^{0} π^{+}$ channels, incorporating new methods of electron identification to improve the statistical power of the dataset. This analysis is sensitive to contributions from right-handed currents from physics beyond the Standard Model by constraining the Wilson coefficients $C_{7}^{(')}$ . We perform a fit to the $B \to K^{*} e^{+} e^{-}$ differential decay rate and measure the imaginary component of the transversality amplitude to be $A_{T}^{Im} = - 1.27 \pm 0.52 \pm 0.12$ , and the $K^{*}$ transverse asymmetry to be $A_{T}^{(2)} = 0.52 \pm 0.53 \pm 0.11$ , with $F_{L}$ and $A_{T}^{Re}$ fixed to the Standard Model values. The resulting constraints on the value of $C_{7}^{'}$ are consistent with the Standard Model within a $2 σ$ confidence interval. Published by the American Physical Society2024
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Search for the semileptonic decays $Ξ_{c}^{0} \to Ξ^{0} ℓ^{+} ℓ^{-}$ at Belle

https://doi.org/10.1103/PhysRevD.109.052003

Cui, J X; Li, Y B; Shen, C P; Adachi, I; Aihara, H; Al_Said, S; Asner, D M; Aushev, T; Ayad, R; Babu, V; et al (March 2024, Physical Review D)

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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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Search for a dark leptophilic scalar produced in association with $τ^{+} τ^{-}$ pair in $e^{+} e^{-}$ annihilation at center-of-mass energies near 10.58 GeV

https://doi.org/10.1103/PhysRevD.109.032002

Biswas, D; Banerjee, Sw; Adachi, I; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Babu, V; Behera, P; Bennett, J; et al (February 2024, Physical Review D)

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Study of $B^{+} \to p \bar{n} π^{0}$

https://doi.org/10.1103/PhysRevD.108.112007

Chu, K-N; Lin, Y-R; Wang, M-Z; Adachi, I; Adamczyk, K; Aihara, H; Al_Said, S; Asner, D M; Atmacan, H; Aulchenko, V; et al (December 2023, Physical Review D)

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Measurement of the energy dependence of the e+e− → $$ B\overline{B} $$, $$ B{\overline{B}}^{\ast } $$, and $$ {B}^{\ast }{\overline{B}}^{\ast } $$ cross sections at Belle II

https://doi.org/10.1007/JHEP10(2024)114

Adachi, I; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Althubiti, N; Anh_Ky, N; Asner, D M; Atmacan, H; et al (October 2024, Journal of High Energy Physics)

A<sc>bstract</sc> We report measurements of thee⁺e⁻→$$ B\overline{B} $$ $B \bar{B}$ ,$$ B{\overline{B}}^{\ast } $$ $B {\bar{B}}^{*}$ , and$$ {B}^{\ast }{\overline{B}}^{\ast } $$ $B^{*} {\bar{B}}^{*}$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle II experiment. We reconstruct oneBmeson in a large number of hadronic final states and use its momentum to identify the production process. In the first 2 – 5 MeV above$$ {B}^{\ast }{\overline{B}}^{\ast } $$ $B^{*} {\bar{B}}^{*}$ threshold, thee⁺e⁻→$$ {B}^{\ast }{\overline{B}}^{\ast } $$ $B^{*} {\bar{B}}^{*}$ cross section increases rapidly. This may indicate the presence of a pole close to the threshold.
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