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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
Authors: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.
Files:.pdf 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)
URL https://academic.oup.com/ptep/article-lookup/doi/10.1093/ptep/ptu043
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract: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.
Keywords:C07, C21, particle properties, lepton collider experiments, experimental particle physics
Year of publishing:2014
Number of pages:str. 1-11
Numbering:št. 4, Letn. 2014
ISSN on article:2050-3911
COBISS_ID:28162343 Link is opened in a new window
DOI:10.1093/ptep/ptu043 Link is opened in a new window
License:CC BY 4.0
This work is available under this license: Creative Commons Attribution 4.0 International
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Record is a part of a journal

Title:Progress of Theoretical and Experimental Physics
Shortened title:Prog. Theor. Exp. Phys.
Publisher:Oxford University Press
COBISS.SI-ID:2704635 New window

Secondary language

Keywords:C07, C21, lastnosti delcev, eksperimenti, leptonski trkalnik, eksperimentalna fizika delcev


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