Heavy quarkonium PP transitions and effects of {kappa} and a possible bb-barqq-bar state

Journal Article · Sat Feb 11 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2176505· OSTI ID:20798093

Shen, P N; Guo, F K; Chiang, H C; Ping, R G ^[1]

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1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing (China)

Heavy quarkonium PP decays are studied with the final state interaction in the framework of Chiral Unitary Approach (ChUA). It is found that {upsilon}(nS) and {psi}(2S) {pi}{pi} decay data, especially the {upsilon}(3S) {yields} {upsilon}(1S){pi}+{pi}- decay data, can be well-explained by introducing an additional intermediate state with JP = 1+, I = 1, M = 10.08GeV and {gamma} = 0.655GeV, which could be a bb-barqq-bar state. By using dimensional regularization method, the singularity in the loop integration in ChUA can be avoid and S-wave K{pi} scattering in the energies less than 1.2GeV can be well-reproduced by simply employing a lowest order Lagrangian (O(p2)) in ChPA with one adjustable parameter only. As a result, the mass and width of {kappa} are estimated to be M{kappa} = 757 {+-} 33MeV and {gamma}{kappa} 558 {+-} 82MeV, respectively. It is shown that {kappa} is very important in explaining the broad bump below 1.1GeV in the K+{pi}- invariant mass spectrum of the J/{psi} {yields} K-bar*0(892)K+{pi}- process.

• OSTI ID: 20798093
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 814; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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