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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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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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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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Evidence for $B^{0} \to p {\bar{Σ}}^{0} π^{-}$ at Belle

https://doi.org/10.1103/PhysRevD.108.052011

Chang, C-Y; Wang, M-Z; Adachi, I; Aihara, H; Said, S Al; Asner, D M; Atmacan, H; Aushev, T; Ayad, R; Babu, V; et al (September 2023, Physical Review D)

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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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Search for the decay $B^{0} \to K^{* 0} τ^{+} τ^{-}$ at the Belle experiment

https://doi.org/10.1103/PhysRevD.108.L011102

Dong, T V; Luo, T; Adachi, I; Aihara, H; Asner, D M; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; et al (July 2023, Physical Review D)

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Observation of a threshold cusp at the $Λ η$ threshold in the $p K^{-}$ mass spectrum with $Λ_{c}^{+} \to p K^{-} π^{+}$ decays

https://doi.org/10.1103/PhysRevD.108.L031104

Yang, S B; Tanida, K; Ahn, J K; Adachi, I; Aihara, H; Asner, D M; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; et al (August 2023, Physical Review D)

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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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Study of the lineshape of $X (3872)$ using $B$ decays to $D^{0} {\bar{D}}^{* 0} K$

https://doi.org/10.1103/PhysRevD.107.112011

Hirata, H.; Iijima, T.; Kato, Y.; Tanida, K.; Adachi, I.; Ahn, J. K.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; et al (June 2023, Physical Review D)

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