281,965 research outputs found

    Exotic QQqˉqˉQQ\bar{q}\bar{q}, QQqˉsˉQQ\bar{q}\bar{s} and QQsˉsˉQQ\bar{s}\bar{s} states

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    After constructing the possible JP=0βˆ’,0+,1βˆ’J^P=0^-, 0^+, 1^- and 1+1^+ QQqΛ‰qΛ‰QQ\bar{q}\bar{q} tetraquark interpolating currents in a systematic way, we investigate the two-point correlation functions and extract the corresponding masses with the QCD sum rule approach. We study the QQqΛ‰qΛ‰QQ\bar{q}\bar{q}, QQqΛ‰sΛ‰QQ\bar{q}\bar{s} and QQsΛ‰sΛ‰QQ\bar{s}\bar{s} systems with various isospins I=0,1/2,1I=0, 1/2, 1. Our numerical analysis indicates that the masses of doubly-bottomed tetraquark states are below the threshold of the two bottom mesons, two bottom baryons and one doubly bottomed baryon plus one anti-nucleon. Very probably these doubly-bottomed tetraquark states are stable.Comment: 37 pages, 2 figure

    Possible JPC=0+βˆ’J^{PC} = 0^{+-} Exotic State

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    We study the possible exotic states with JPC=0+βˆ’J^{PC} = 0^{+-} using the tetraquark interpolating currents with the QCD sum rule approach. The extracted masses are around 4.85 GeV for the charmonium-like states and 11.25 GeV for the bottomomium-like states. There is no working region for the light tetraquark currents, which implies the light 0+βˆ’0^{+-} state may not exist below 2 GeV.Comment: 13 pages, 11 figures, 2 table
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