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Search for a heavy neutral lepton that mixes predominantly with the tau neutrino

https://doi.org/10.1103/PhysRevD.109.L111102

Nayak, M; Dey, S; Soffer, A; Adachi, I; Aihara, H; Al_Said, S; Asner, D M; Atmacan, H; Ayad, R; Babu, V; et al (June 2024, Physical Review D)

We report a search for a heavy neutral lepton (HNL) that mixes predominantly with $ν_{τ}$ . The search utilizes data collected with the Belle detector at the KEKB asymmetric energy $e^{+} e^{-}$ collider. The data sample was collected at and just below the center-of-mass energies of the $ϒ (4 S)$ and $ϒ (5 S)$ resonances and has an integrated luminosity of $915 {fb}^{- 1}$ , corresponding to $(836 \pm 12) \times 10^{6}$ $e^{+} e^{-} \to τ^{+} τ^{-}$ events. We search for production of the HNL (denoted $N$ ) in the decay $τ^{-} \to π^{-} N$ followed by its decay via $N \to μ^{+} μ^{-} ν_{τ}$ . The search focuses on the parameter-space region in which the HNL is long-lived, so that the $μ^{+} μ^{-}$ originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the $τ$ neutrino as a function of the HNL mass. Published by the American Physical Society2024
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Free, publicly-accessible full text available June 1, 2025
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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Observation of the antimatter hypernucleus $${}_{\bar{{\boldsymbol{\Lambda }}}}{}^{{\bf{4}}}\bar{{\bf{H}}}$$

https://doi.org/10.1038/s41586-024-07823-0

Abdulhamid, M I; Aboona, B E; Adam, J; Adamczyk, L; Adams, J R; Aggarwal, I; Aggarwal, M M; Ahammed, Z; Aschenauer, E C; Aslam, S; et al (August 2024, Nature)

Free, publicly-accessible full text available August 29, 2025
Search for a Heavy Neutrino in $τ$ Decays at Belle

https://doi.org/10.1103/PhysRevLett.131.211802

Liventsev, D; Adachi, I; Aihara, H; Al_Said, S; Asner, D M; Atmacan, H; Ayad, R; Babu, V; Banerjee, Sw; Bauer, M; et al (November 2023, Physical Review Letters)

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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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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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