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Title: Measurement of branching fractions for $B \to J/\psi \eta K$ decays and search for a narrow resonance in the $J/\psi \eta$ final state Iwashita, T. (Author)Bračko, Marko (Author)Golob, Boštjan (Author)Klučar, Jure (Author)Korpar, Samo (Author)Križan, Peter (Author)Pestotnik, Rok (Author)Petrič, Marko (Author)Stanič, Samo (Other)Starič, Marko (Author)Šantelj, Luka (Author)Zupanc, Anže (Author), et al. Progress_of_Theoretical_and_Experimental_Physics_2014_Iwashita_et_al._Measurement_of_branching_fractions_for_B→_JψηK_decays_and_search_f.pdf (372,20 KB)  https://academic.oup.com/ptep/article-lookup/doi/10.1093/ptep/ptu043 English Scientific work (r2) 1.01 - Original Scientific Article FKKT - Faculty of Chemistry and Chemical Engineering We report an observation of the $B^{\pm } \to J/\psi \eta K^{\pm }$ and $B^0 \to J/\psi \eta K^0_S$ decays using $772\times 10^{6}B\overline {B}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We obtain the branching fractions ${\mathcal B}(B^{\pm }\rightarrow J/\psi \eta K^{\pm })=(1.27\pm 0.11(\hbox {stat.})\pm 0.11(\hbox {syst.}))\times 10^{-4}$ and ${\mathcal B}(B^0\to J/\psi \eta K^0_S)=(5.22 \pm 0.78 (\hbox {stat.}) \pm 0.49 (\hbox {syst.}))\times 10^{-5}$. We search for a new narrow charmonium(-like) state $X$ in the $J/\psi \eta$ mass spectrum and find no significant excess. We set upper limits on the product of branching fractions, ${\mathcal B}(B^\pm \to XK^\pm){\mathcal B}(X \to J/\psi \eta)$, at $3872\,\hbox {MeV}\,c^{-2}$ where a $C$-odd partner of $X(3872)$ may exist, at $\psi (4040)$ and $\psi (4160)$ assuming their known mass and width, and over a range from 3.8 to $4.8\,\hbox {GeV}\,c^{-2}$. The obtained upper limits at 90% confidence level for $X^{C\hbox {-}{\rm odd}}(3872)$, $\psi (4040)$, and $\psi (4160)$ are $3.8\times 10^{-6}$, $15.5\times 10^{-6}$, and $7.4\times 10^{-6}$, respectively. C07, C21, particle properties, lepton collider experiments, experimental particle physics 2014 str. 1-11 št. 4, Letn. 2014 2050-3911 539.1 2050-3911 28162343 10.1093/ptep/ptu043 URN:SI:UM:DK:GX0ZKAEF This work is available under this license: Creative Commons Attribution 4.0 International 336 66 Misc.

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## Record is a part of a journal

Title: Progress of Theoretical and Experimental Physics Prog. Theor. Exp. Phys. Oxford University Press 2050-3911 2704635

## Secondary language

Language: Slovenian C07, C21, lastnosti delcev, eksperimenti, leptonski trkalnik, eksperimentalna fizika delcev