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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 charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle

https://doi.org/10.1007/JHEP02(2024)187

Dhamija, R; Nishida, S; Giri, A; Adachi, I; Aihara, H; Asner, D M; Aushev, T; Ayad, R; Babu, V; Bahinipati, S; et al (February 2024, Journal of High Energy Physics)

A<sc>bstract</sc> We report a search for the charged-lepton flavor violation in Υ(2S) →ℓ^∓τ^±(ℓ=e, μ) decays using a 25 fb⁻¹Υ(2S) sample collected by the Belle detector at the KEKBe⁺e⁻asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($$ \mathcal{B} $$ $B$ ) at 90% confidence level. We obtain the most stringent upper limits:$$ \mathcal{B} $$ $B$ (Υ(2S)→ μ^∓τ^±)<0.23×10⁻⁶and$$ \mathcal{B} $$ $B$ (Υ(2S)→ e^∓τ^±)<1.12×10⁻⁶.
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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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Observation of charmed strange meson pair production in $ϒ (2 S)$ decays and in $e^{+} e^{-}$ annihilation at $\sqrt{s} = 10.52 GeV$

https://doi.org/10.1103/PhysRevD.108.112015

Gao, B S; Zhu, W J; Wang, X L; Adachi, I; Aihara, H; Asner, D M; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; et al (December 2023, 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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First Simultaneous Determination of Inclusive and Exclusive $| V_{u b} |$

https://doi.org/10.1103/PhysRevLett.131.211801

Cao, L; Bernlochner, F; Tackmann, K; Adachi, I; Aihara, H; Al_Said, S; Asner, D M; Atmacan, H; Aushev, T; Ayad, R; et al (November 2023, Physical Review Letters)

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Search for the double-charmonium state with ηcJ/ψ at Belle

https://doi.org/10.1007/JHEP08(2023)121

Yin, J H; Li, Y B; Won, E; Adachi, I; Aihara, H; Al_Said, S; Asner, D M; Aushev, T; Ayad, R; Babu, V; et al (August 2023, Journal of High Energy Physics)

A<sc>bstract</sc> We measure the cross section ofe⁺e⁻→η_cJ/ψat the Υ(nS)(n= 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of 955 fb⁻¹. We also search for double charmonium production ine⁺e⁻→η_cJ/ψvia initial state radiation near theη_cJ/ψthreshold. No evident signal of the double charmonium state is found, but evidence for thee⁺e⁻→ η_cJ/ψprocess is found with a statistical significance greater than 3.3σnear theη_cJ/ψthreshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.
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Measurement of the e+e− → $$ {B}_s^0{\overline{B}}_s^0X $$ cross section in the energy range from 10.63 to 11.02 GeV using inclusive $$ {D}_s^{+} $$ and D0 production

https://doi.org/10.1007/JHEP08(2023)131

Zhukova, V; Mizuk, R; Adachi, I; Aihara, H; Al_Said, S; 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 report the first measurement of the inclusivee⁺e⁻→$$ b\overline{b} $$ $b \bar{b}$ →$$ {D}_s^{\pm } $$ $D_{s}^{\pm}$ Xande⁺e⁻→$$ b\overline{b} $$ $b \bar{b}$ → D⁰/$$ {\overline{D}}^0 $$ ${\bar{D}}^{0}$ Xcross sections in the energy range from 10.63 to 11.02 GeV. Based on these results, we determineσ(e⁺e⁻→$$ {B}_s^0{\overline{B}}_s^0 $$ $B_{s}^{0} {\bar{B}}_{s}^{0}$ X) andσ(e⁺e⁻→$$ B\overline{B} $$ $B \bar{B}$ X) in the same energy range. We measure the fraction of$$ {B}_s^0 $$ $B_{s}^{0}$ events at Υ(10860) to bef_s= ($$ {22.0}_{-2.1}^{+2.0} $$ ${22.0}_{- 2.1}^{+ 2.0}$ )%. We determine also the ratio of the$$ {B}_s^0 $$ $B_{s}^{0}$ inclusive branching fractions$$ \mathcal{B} $$ $B$ ($$ {B}_s^0 $$ $B_{s}^{0}$ → D⁰/$$ {\overline{D}}^0 $$ ${\bar{D}}^{0}$ X)/$$ \mathcal{B} $$ $B$ ($$ {B}_s^0 $$ $B_{s}^{0}$ →$$ {D}_s^{\pm } $$ $D_{s}^{\pm}$ X) = 0.416 ± 0.018 ± 0.092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energye⁺e⁻collider.
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First Measurement of the Michel Parameter $ξ^{'}$ in the $τ^{-} \to μ^{-} {\bar{ν}}_{μ} ν_{τ}$ Decay at Belle

https://doi.org/10.1103/PhysRevLett.131.021801

Bodrov, D; Pakhlov, P; Adachi, I; Aihara, H; Said, S Al; Asner, D M; Atmacan, H; Aushev, T; Ayad, R; Babu, V; et al (July 2023, Physical Review Letters)

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