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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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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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Branching fraction measurement of the decay $B^{+} \to ψ (2 S) ϕ (1020) K^{+}$

https://doi.org/10.1103/PhysRevD.111.092008

Aaij, R; Abdelmotteleb, A_S W; Abellan_Beteta, C; Abudinén, F; Ackernley, T; Adefisoye, A A; Adeva, B; Adinolfi, M; Adlarson, P; Agapopoulou, C; et al (May 2025, Physical Review D)

The branching fraction of the decay $B^{+} \to ψ (2 S) ϕ (1020) K^{+}$ , relative to the topologically similar decay $B^{+} \to J / ψ ϕ (1020) K^{+}$ , is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of $9 {fb}^{- 1}$ . The ratio is found to be $0.061 \pm 0.004 \pm 0.009$ , where the first uncertainty is statistical and the second systematic. Using the world-average branching fraction for $B^{+} \to J / ψ ϕ (1020) K^{+}$ , the branching fraction for the decay $B^{+} \to ψ (2 S) ϕ (1020) K^{+}$ is found to be $(3.0 \pm 0.2 \pm 0.5 \pm 0.2) \times 10^{- 6}$ , where the first uncertainty is statistical, the second systematic, and the third is due to the branching fraction of the normalization channel. © 2025 CERN, for the LHCb Collaboration2025CERN
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Free, publicly-accessible full text available May 1, 2026
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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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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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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