Investigation of the light four-quark states with exotic 
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Huang, Zhuo-Ran; Chen, Wei; Steele, T. G.; Zhang, Zhufeng; Jin, Hong-Ying

doi:10.1103/physrevd.95.076017

“…QCD sum rules [23][24][25], a powerful and successful nonperturbative method, have been widely applied to study various exotic hadrons [26][27][28][29][30][31][32][33][34][35][36][37]. In this method we calculate the two-point correlation function at both the hadron and quarkgluon levels:…”

Section: Qcd Sum Rule Analysesmentioning

confidence: 99%

QCD sum rule studies of $$s s {\bar{s}} {\bar{s}}$$ s s s ¯ s

Cui

¹

,

Yang

²

,

Chen

³

et al. 2019

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We apply the method of QCD sum rules to study the structure X newly observed by the BESIII Collaboration in the φη mass spectrum in 2.0-2.1 GeV region in the J/ψ → φηη decay. We construct all the ssss tetraquark currents with J PC = 1 +− , and use them to perform QCD sum rule analyses. One current leads to reliable QCD sum rule results and the mass is extracted to be 2.00 +0.10 −0.09 GeV, suggesting that the structure X can be interpreted as an ssss tetraquark state with J PC = 1 +−. The Y (2175) can be interpreted as its ssss partner having J PC = 1 −− , and we propose to search for the other two partners, the ssss tetraquark states with J PC = 1 ++ and 1 −+ , in the η f 0 (980), η KK , and η KK * mass spectra.

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“…In summary, utilizing the recoil mass spectra of the χ c1 , f 1 (1285), J/ψ, and ω in the channels Υ(1S, 2S) → χ c1 + G 0 −− , Υ(1S, 2S) → f 1 (1285) + G 0 −− , χ b1 → J/ψ + G 0 −− , and χ b1 → ω + G 0 −− [17], respectively, we report the first search for the light tetraquark states predicted with a mass of 1.66 ± 0.14 GeV/c 2 and J P C = 0 −− , and with a mass in the region 1.18-1.43 GeV/c 2 and J P C = 1 +− [16]. No evident signal is found below 3 GeV/c 2 in the above processes and 90% C.L.…”

Section: Discussionmentioning

confidence: 99%

“…Since no backgrounds showing peak distributions are found, a second-order Chebyshev polynomial shape is used for the backgrounds. The fit result for the X tetra signal with its mass fixed at 1.66 GeV/c 2 (a theoretically predicted mass for a scalar tetraquark state [16]) and width fixed at 0.10 GeV is shown in Fig. 12.…”

Section: Search For X Tetra In υ(1s) υ(2s) and χ B1 Decaysmentioning

confidence: 99%

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Search for light tetraquark states in ϒ(1S) and ϒ(2S) dec

Jia¹,

Shen²,

Yuan³

et al. 2017

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We search for the J P C = 0 −− and 1 +− light tetraquark states with masses up to 2.46 GeV/c 2 in Υ(1S) and Υ(2S) decays with data samples of (102 ± 2) million and (158 ± 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 Υ(1S) and Υ(2S) decays are obtained. The inclusive branching fractions of the Υ(1S) and Υ(2S) decays into final states with f 1 (1285) are measured to be B(Υ(1S) → f 1 (1285) + anything) = (46 ± 28(stat.) ± 13(syst.)) × 10 −4 and B(Υ(2S) → f 1 (1285) + anything) = (22 ± 15(stat.) ± 6.3(syst.)) × 10 −4. The measured χ b2 → J/ψ + anything branching fraction is measured to be (1.50 ± 0.34(stat.) ± 0.22(syst.)) × 10 −3 , and 90% C.L. upper limits for the χ b0,b1 → J/ψ + anything branching fractions are found to be 2.3 × 10 −3 and 1.1 × 10 −3 , respectively. For B(χ b1 → ω + anything), the branching fraction is measured to be (4.9 ± 1.3(stat.) ± 0.6(syst.)) × 10 −2. All results reported here are the first measurements for these modes.

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“…QCD sum rules [23][24][25], a powerful and successful nonperturbative method, have been widely applied to study various exotic hadrons [26][27][28][29][30][31][32][33][34][35][36][37]. In this method we calculate the two-point correlation function at both the hadron and quark-gluon levels:…”

Section: Qcd Sum Rule Analysesmentioning

confidence: 99%

QCD sum rule studies on the $s s \bar s \bar s$ tetraquark states with $J^{PC} = 1^{+-}$

Cui,

Yang,

Chen

et al. 2019

Preprint

Self Cite

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We apply the method of QCD sum rules to study the structure X newly observed by the BESIII Collaboration in the φη ′ mass spectrum in 2.0-2.1 GeV region in the J/ψ → φηη ′ decay. We construct all the ssss tetraquark currents with J P C = 1 +− , and use them to perform QCD sum rule analyses. One current leads to reliable QCD sum rule results and the mass is extracted to be 2.00 +0.10 −0.09 GeV, suggesting that the structure X can be interpreted as an ssss tetraquark state with J P C = 1 +− . The Y (2175) can be interpreted as its ssss partner having J P C = 1 −− , and we propose to search for the other two partners, the ssss tetraquark states with J P C = 1 ++ and 1 −+ , in the η ′ f0(980), η ′ K K, and η ′ K K * mass spectra.

show abstract

Investigation of the light four-quark states with exotic JPC=0−−

Cited by 22 publications

References 74 publications

QCD sum rule studies of $$s s {\bar{s}} {\bar{s}}$$ s s s ¯ s

QCD sum rule studies of $$s s {\bar{s}} {\bar{s}}$$ s s s ¯ s

Search for light tetraquark states in ϒ(1S) and ϒ(2S) dec

QCD sum rule studies on the $s s \bar s \bar s$ tetraquark states with $J^{PC} = 1^{+-}$

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