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1. Evidence for $B^{+}\to h_c{K}^{+}$ and observation of ${\eta }_c\left(2S\right)\to p\overline{p}{\pi }^{+}{\pi }^{-}$

   https://doi.org/10.1103/PhysRevD.100.012001  

   Chilikin, K.; Adachi, I.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bansal, V.; Behera, P.; et al (July 2019, Physical Review D)
2. Search for transitions from $\mathrm{\Upsilon }\left(4S\right)$ and $\mathrm{\Upsilon }\left(5S\right)$ to ${\eta }_b\left(1S\right)$ and ${\eta }_b\left(2S\right)$ with emission of an $\omega$ meson

   https://doi.org/10.1103/PhysRevD.102.092011  

   Oskin, P.; Mizuk, R.; Aihara, H.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; Behera, P.; Belous, K.; et al (November 2020, Physical Review D)

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3. Measurement of branching fractions and $CP$ asymmetries for $D_s^{+}\to K^{+}(\eta ,{\pi }^0)$ and $D_s^{+}\to {\pi }^{+}(\eta ,{\pi }^0)$ decays at Belle

   https://doi.org/10.1103/PhysRevD.103.112005  

   Guan, Y.; Schwartz, A. J.; Kinoshita, K.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; et al (June 2021, Physical Review D)

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4. Search for charmed baryons in the ${\mathrm{\Lambda }}_c^{+}\eta$ system and measurement of the branching fractions of ${\mathrm{\Lambda }}_c(2880{)}^{+}$ and ${\mathrm{\Lambda }}_c(2940{)}^{+}$ decaying to ${\mathrm{\Lambda }}_c^{+}\eta$ and $p{D}^0$ relative to ${\mathrm{\Sigma }}_c\left(2455\right)\pi$

   https://doi.org/10.1103/PhysRevD.110.032021  

   Li, S X; Shen, C P; Adachi, I; Ahn, J K; Aihara, H; Asner, D M; Atmacan, H; Aushev, T; Ayad, R; Banerjee, Sw; et al (August 2024, Physical Review D)

   We search for excited charmed baryons in the ${\mathrm{\Lambda }}_c^{+}\eta$system using a data sample corresponding to an integrated luminosity of $980{\mathrm{fb}}^{-1}$. The data were collected by the Belle detector at the KEKB $e^{+}{e}^{-}$asymmetric-energy collider. No significant signals are found in the ${\mathrm{\Lambda }}_c^{+}\eta$mass spectrum, including the known ${\mathrm{\Lambda }}_c(2880{)}^{+}$and ${\mathrm{\Lambda }}_c(2940{)}^{+}$. Clear ${\mathrm{\Lambda }}_c(2880{)}^{+}$and ${\mathrm{\Lambda }}_c(2940{)}^{+}$signals are observed in the $p{D}^0$mass spectrum. We set upper limits at 90% credibility level on ratios of branching fractions of ${\mathrm{\Lambda }}_c(2880{)}^{+}$and ${\mathrm{\Lambda }}_c(2940{)}^{+}$decaying to ${\mathrm{\Lambda }}_c^{+}\eta$relative to ${\mathrm{\Sigma }}_c\left(2455\right)\pi$of $<0.13$for the ${\mathrm{\Lambda }}_c(2880{)}^{+}$and $<1.11$for the ${\mathrm{\Lambda }}_c(2940{)}^{+}$. We measure ratios of branching fractions of ${\mathrm{\Lambda }}_c(2880{)}^{+}$and ${\mathrm{\Lambda }}_c(2940{)}^{+}$decaying to $p{D}^0$relative to ${\mathrm{\Sigma }}_c\left(2455\right)\pi$of $0.75\pm 0.03\left(\mathrm{stat}\right)\pm 0.07\left(\mathrm{syst}\right)$for the ${\mathrm{\Lambda }}_c(2880{)}^{+}$and $3.59\pm 0.21\left(\mathrm{stat}\right)\pm 0.56\left(\mathrm{syst}\right)$for the ${\mathrm{\Lambda }}_c(2940{)}^{+}$. Published by the American Physical Society2024 

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5. Search for the ${\eta }_{c2}\left(1D\right)$ in $e^{+}{e}^{-}\to \gamma {\eta }_{c2}\left(1D\right)$ at $\sqrt{s}$ near 10.6 GeV at Belle

   https://doi.org/10.1103/PhysRevD.104.012012  

   Jia, S.; Shen, C. P.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aushev, T.; Ayad, R.; Babu, V.; Behera, P.; et al (July 2021, Physical Review D)