[psi] [eta] final state

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

Povzetek

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.

Ključne besede

C07;C21;particle properties;lepton collider experiments;experimental particle physics;

Podatki

Jezik:	Angleški jezik
Leto izida:	2014
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
UDK:	539.1
COBISS:	28162343
ISSN:	2050-3911
Št. ogledov:	897
Št. prenosov:	149
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	C07;C21;lastnosti delcev;eksperimenti;leptonski trkalnik;eksperimentalna fizika delcev;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Znanstveno delo
Strani:	str. 043C01-1-043C01-11
Letnik:	ǂVol. ǂ2014
Čas izdaje:	2014
DOI:	10.1093/ptep/ptu043
ID:	10850530