Tetraquark Interpretation of the BELLE Data on the Anomalous {Upsilon}(1S){pi}{sup +{pi}-} and {Upsilon}(2S){pi}{sup +{pi}-} Production near the {Upsilon}(5S) Resonance

Journal Article · Fri Apr 23 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.162001· OSTI ID:21410640

Ali, Ahmed; Hambrock, Christian; Aslam, M Jamil ^[1]

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1. Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg (Germany)

We analyze the Belle data [K. F. Chen et al. (Belle Collaboration), Phys. Rev. Lett. 100, 112001 (2008); I. Adachi et al. (Belle Collaboration), arXiv:0808.2445] on the processes e{sup +}e{sup -{yields}{Upsilon}}(1S){pi}{sup +{pi}-},{Upsilon}(2S){pi}{sup +{pi}-} near the peak of the {Upsilon}(5S) resonance, which are found to be anomalously large in rates compared to similar dipion transitions between the lower {Upsilon} resonances. Assuming these final states arise from the production and decays of the J{sup PC}=1{sup --} state Y{sub b}(10 890), which we interpret as a bound (diquark-antidiquark) tetraquark state [bq][bq], a dynamical model for the decays Y{sub b{yields}{Upsilon}}(1S){pi}{sup +{pi}-},{Upsilon}(2S){pi}{sup +{pi}-} is presented. Depending on the phase space, these decays receive significant contributions from the scalar 0{sup ++} states, f{sub 0}(600) and f{sub 0}(980), and from the 2{sup ++} qq-meson f{sub 2}(1270). Our model provides excellent fits for the decay distributions, supporting Y{sub b} as a tetraquark state.

• OSTI ID: 21410640
• Journal Information: Physical Review Letters, Vol. 104, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.104.162001; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
DISTRIBUTION
ELECTRON-POSITRON INTERACTIONS
F0-980 MESONS
F2-1270 MESONS
PARTICLE PRODUCTION
PEAKS
PHASE SPACE
PIONS MINUS
PIONS PLUS
QUARKS
RESONANCE PARTICLES
BOSONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL SPACE
MESONS
PARTICLE INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
SCALAR MESONS
SPACE
TENSOR MESONS