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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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Measurement of the branching fraction of the decay $B^{-} \to D^{0} ρ (770)^{-}$ at Belle II

https://doi.org/10.1103/PhysRevD.109.L111103

Adachi, I; Aggarwal, L; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Atmacan, H; Aushev, V; Aversano, M; et al (June 2024, Physical Review D)

We measure the branching fraction of the decay $B^{-} \to D^{0} ρ (770)^{-}$ using data collected with the Belle II detector. The data contain 387 million $B \bar{B}$ pairs produced in $e^{+} e^{-}$ collisions at the $ϒ (4 S)$ resonance. We reconstruct $8360 \pm 180$ decays from an analysis of the distributions of the $B^{-}$ energy and the $ρ (770)^{-}$ helicity angle. We determine the branching fraction to be $(0.939 \pm 0.021 (stat) \pm 0.050 (syst)) %$ , in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two. Published by the American Physical Society2024
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Search for the Lepton Flavor Violating Decays $B^{+} \to K^{+} τ^{\pm} ℓ^{\mp}$ ( $ℓ = e$ , $μ$ ) at Belle

https://doi.org/10.1103/PhysRevLett.130.261802

Watanuki, S.; de Marino, G.; Trabelsi, K.; Adachi, I.; Aihara, H.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; et al (June 2023, Physical Review Letters)

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Measurement of $C P$ asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays at Belle II

https://doi.org/10.1103/PhysRevD.109.112020

Adachi, I; Aggarwal, L; Ahmed, H; Aihara, H; Akopov, N; Aloisio, A; Anh_Ky, N; Asner, D M; Atmacan, H; Aushev, T; et al (June 2024, Physical Review D)

We report a measurement of decay-time-dependent charge-parity ( $C P$ ) asymmetries in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ decays. We use $387 \times 10^{6}$ $B \bar{B}$ pairs collected at the $ϒ (4 S)$ resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the $C P$ -violating parameters $S$ and $C$ from a fit to the distribution of the decay-time difference between the two $B$ mesons. The resulting confidence region is consistent with previous measurements in $B^{0} \to K_{S}^{0} K_{S}^{0} K_{S}^{0}$ and $B^{0} \to (c \bar{c}) K^{0}$ decays and with predictions based on the standard model. Published by the American Physical Society2024
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Measurement of differential distributions of $B \to D^{*} ℓ {\bar{ν}}_{ℓ}$ and implications on $| V_{c b} |$

https://doi.org/10.1103/PhysRevD.108.012002

Prim, M T; Bernlochner, F; Metzner, F; Lieret, K; Kuhr, T; Adachi, I; Aihara, H; Said, S Al; Asner, D M; Atmacan, H; et al (July 2023, Physical Review D)

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