| 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 |
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| Authors: | ID Iwashita, T. (Author)
ID Bračko, Marko (Author)
ID Golob, Boštjan (Author)
ID Klučar, Jure (Author)
ID Korpar, Samo (Author)
ID Križan, Peter (Author)
ID Pestotnik, Rok (Author)
ID Petrič, Marko (Author)
ID Stanič, Samo (Other)
ID Starič, Marko (Author)
ID Šantelj, Luka (Author)
ID Zupanc, Anže (Author), et al. |
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| Files: |  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)
MD5: 48C1B8D0B78234936C4EF7B4CFC4309D
PID: 20.500.12556/dkum/ddc5ba05-6879-499d-afca-d14e244eba0f
 https://academic.oup.com/ptep/article-lookup/doi/10.1093/ptep/ptu043
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| 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. |
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| Keywords: | C07, C21, particle properties, lepton collider experiments, experimental particle physics |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Year of publishing: | 2014 |
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| Number of pages: | str. 1-11 |
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| Numbering: | Letn. 2014, št. 4 |
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| PID: | 20.500.12556/DKUM-66977  |
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| ISSN: | 2050-3911 |
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| UDC: | 539.1 |
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| ISSN on article: | 2050-3911 |
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| COBISS.SI-ID: | 28162343 |
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| DOI: | 10.1093/ptep/ptu043 |
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| NUK URN: | URN:SI:UM:DK:GX0ZKAEF |
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| Publication date in DKUM: | 21.07.2017 |
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| Views: | 1710 |
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| Downloads: | 276 |
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| Metadata: |    |
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| Categories: | Misc.
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