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.

arXiv comment19 pages, 15 figures; a few minor text corrections; accepted for publication as a regular article in Physical Review D

References in corpus (26)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a charged charmoniumlike structure in e+e- to pi+pi-J/psi at \sqrt{s}=4.26 GeV
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• Study of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Observation of a Charged Charmonium-like State at Belle
• Observation of two charged bottomonium-like resonances in Y(5S) decays
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• QCD and strongly coupled gauge theories: challenges and perspectives
• Including Systematic Uncertainties in Confidence Interval Construction for Poisson Statistics
• Charmonium Decays of $Y(4260), psi(4160), and psi(4040)
• Observation of a new charmonium state in double charmonium production in e+ e- annihilation at \sqrt{s} ~ 10.6 GeV
• Four-Quark Hadrons: an Updated Review
• Finding the $0^{--}$ Glueball
• Measurement of ${CP}\xspace$ Violation Parameters with a Dalitz Plot Analysis of $B^{\pm }\to D_{{\pi }^{+}{\pi }^{-}{\pi }^0}{K}^{\pm }$
• Measurement of the Mass Splittings between the $b\bar{b}{\chi }_{b,J}(1P)$ States
• Investigation of the light four-quark states with exotic $J^{PC}=0^{--}$
• Is the exotic $0^{--}$ glueball a pure gluon state ?
• Comment on "Finding the $0^{--}$ Glueball" [arXiv:1408.3995]
• Search for the $0^{--}$ Glueball in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays
• Measurement of exclusive ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays into Vector-Pseudoscalar final states
• Study of the D0 --> pi+ pi- pi0 decay at BABAR
• Test for exotic isoscalar resonance dominating $D^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$ decays

Cited by in corpus (1)

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