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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 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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Measurement of Angular Coefficients of $\bar{B} \to D^{*} ℓ {\bar{ν}}_{ℓ}$ : Implications for $| V_{c b} |$ and Tests of Lepton Flavor Universality

https://doi.org/10.1103/PhysRevLett.133.131801

Prim, M T; Bernlochner, F; Metzner, F; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Babu, V; Banerjee, Sw; Behera, P; et al (September 2024, Physical Review Letters)

We measure the complete set of angular coefficients $J_{i}$ for exclusive $\bar{B} \to D^{*} ℓ {\bar{ν}}_{ℓ}$ decays ( $ℓ = e$ , $μ$ ). Our analysis uses the full $711 {fb}^{- 1}$ Belle dataset with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the $\bar{B} \to D^{*}$ transition and the Cabibbo-Kobayashi-Maskawa matrix element $| V_{cb} |$ . Using recent lattice QCD calculations for the hadronic form factors, we find $| V_{cb} | = (40.7 \pm 0.7) \times 10^{- 3}$ using the Boyd-Grinstein-Lebed parametrization, compatible with determinations from inclusive semileptonic decays. We search for lepton flavor universality violation as a function of the hadronic recoil parameter $w$ and investigate the differences of the electron and muon angular distributions. We find no deviation from standard model expectations. 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 $C P$ violation in $D_{(s)}^{+} \to K^{+} K_{S}^{0} h^{+} h^{-}$ ( $h = K$ , $π$ ) decays and observation of the Cabibbo-suppressed decay $D_{s}^{+} \to K^{+} K^{-} K_{S}^{0} π^{+}$

https://doi.org/10.1103/PhysRevD.108.L111102

Moon, H K; Won, E; Adachi, I; Aihara, H; Asner, D M; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; et al (December 2023, Physical Review D)

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Search for $$ {\textrm{B}}_{\textrm{s}}^0 $$ → ℓ∓τ± with the semi-leptonic tagging method at Belle

https://doi.org/10.1007/JHEP08(2023)178

Nayak, L; Nishida, S; Giri, A; Adachi, I; Aihara, H; Asner, D M; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; et al (August 2023, Journal of High Energy Physics)

A<sc>bstract</sc> We present a search for the lepton-flavor-violating decays$$ {B}_s^0 $$ $B_{s}^{0}$ →ℓ^∓τ^±, whereℓ=e, μ, using the full data sample of 121 fb⁻¹collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energye⁺e⁻collider. We use$$ {B}_s^0{\overline{B}}_s^0 $$ $B_{s}^{0} {\bar{B}}_{s}^{0}$ events in which one$$ {B}_s^0 $$ $B_{s}^{0}$ meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for$$ {B}_s^0 $$ $B_{s}^{0}$ → ℓ^∓τ^±decays and set upper limits on their branching fractions at 90% confidence level as$$ \mathcal{B} $$ $B$ ($$ {B}_s^0 $$ $B_{s}^{0}$ → e^∓τ^±)<14×10⁻⁴and$$ \mathcal{B} $$ $B$ ($$ {B}_s^0 $$ $B_{s}^{0}$ → μ^∓τ^±)<7.3×10⁻⁴. Our result represents the first upper limit on the$$ {B}_s^0 $$ $B_{s}^{0}$ → e^∓τ^±decay rate.
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Search for lepton-flavor-violating τ decays into a lepton and a vector meson using the full Belle data sample

https://doi.org/10.1007/JHEP06(2023)118

Tsuzuki, N.; Inami, K.; Adachi, I.; Aihara, H.; Asner, D. M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.; Banerjee, Sw.; et al (June 2023, Journal of High Energy Physics)

A bstract Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of τ lepton decays into a light charged lepton ( ℓ = e ± or μ ± ) and a vector meson ( V 0 = ρ 0 , ϕ , ω , K *0 , or $$ \overline{K} $$ K ¯ *0 ) using 980 fb − 1 of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the τ → ℓV 0 branching fractions in the range of (1.7–4 . 3) × 10 − 8 . These limits are improved by 30% on average from the previous results.
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