Search for light tetraquark states in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays

Abstract

We search for the $J^{PC}=0^{--}$ and $1^{+-}$ light tetraquark states with masses up to 2.46~GeV/$c^2$ in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays with data samples of $(102\pm 2)$ million and $(158\pm 4)$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90\% credibility level (C.L.) upper limits on their branching fractions in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays are obtained. The inclusive branching fractions of the ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays into final states with $f_1(1285)$ are measured to be $\mathcal{B}({\rm Y}(1S)\to f_1(1285)+anything)=(46\pm 28(stat.)\pm 13(syst.))\times 10^{-4}$ and $\mathcal{B}({\rm Y}(2S)\to f_1(1285)+anything)=(22\pm 15(stat.)\pm 6.3(syst.))\times 10^{-4}$. The measured ${\chi }_{b2}\to J/\psi +anything$ branching fraction is measured to be $(1.50\pm 0.34(stat.)\pm 0.22(syst.))\times 10^{-3}$, and 90\% C.L. upper limits for the ${\chi }_{b0,b1}\to J/\psi +anything$ branching fractions are found to be $2.3\times 10^{-3}$ and $1.1\times 10^{-3}$, respectively. For $\mathcal{B}({\chi }_{b1}\to \omega +anything)$, the branching fraction is measured to be $(4.9\pm 1.3(stat.)\pm 0.6(syst.))\times 10^{-2}$. %($<3.68\times 10^{-2}$ at 90\% C.L.). All results reported here are the first measurements for these modes.

19 pages, 15 figures; a few minor text corrections; accepted for publication as a regular article in Physical Review D

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Cited by in corpus (1)

• Experimental review of the ${\rm Y}(1S,2S,3S)$ physics at $e^{+}{e}^{-}$ colliders and the LHC