[psi] [eta] final state

T. Iwashita (Author), Marko Bračko (Author), Boštjan Golob (Author), Jure Klučar (Author), Samo Korpar (Author), Peter Križan (Author), Rok Pestotnik (Author), Marko Petrič (Author), Marko Starič (Author), Luka Šantelj (Author), Anže Zupanc (Author)

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;

Data

Language:	English
Year of publishing:	2014
Typology:	1.01 - Original Scientific Article
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC:	539.1
COBISS:	28162343
ISSN:	2050-3911
Views:	897
Downloads:	149
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	C07;C21;lastnosti delcev;eksperimenti;leptonski trkalnik;eksperimentalna fizika delcev;
URN:	URN:SI:UM:
Type (COBISS):	Scientific work
Pages:	str. 043C01-1-043C01-11
Volume:	ǂVol. ǂ2014
Chronology:	2014
DOI:	10.1093/ptep/ptu043
ID:	10850530