Possibility of Exotic States in the Upsilon system
Feb, 20085 pages
e-Print:
- 0802.0649 [hep-ph]
Report number:
- TAUP-2869-07,
- WIS-03-08-FEB-DPP,
- ANL-HEP-PR-08-7
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Abstract: (arXiv)
Recent data from Belle show unusually large partial widths Upsilon(5S) --> Upsilon(1S) pi^+pi^- and \Upsilon(5S) --> \Upsilon(2S) pi^+ pi^-. The Z(4430) narrow resonance also reported by Belle in psi' pi^+ spectrum has the properties expected of a (cbar c u dbar) charged isovector tetraquark T^{+-}_cc The analogous state T^{+-} in the bottom sector might mediate anomalously large cascade decays in the Upsilon system, Upsilon(mS) --> T^{+-}_bb pi^{-+} --> Upsilon(nS) pi^+ \pi^-, with a tetraquark-pion intermediate state. We suggest looking for the (bbar b u dbar) tetraquark in these decays as peaks in the invariant mass of Upsilon(1S) pi or Upsilon(2S) pi systems. The (bbar b u sbar) tetraquark can appear in the observed decays Upsilon(5S) --> Upsilon(1S) K^+ K^- as a peak in the invariant mass of Upsilon(1S) K system. We review the model showing that these tetraquarks are below the two heavy meson threshold, but respectively above the Upsilon pi pi and Upsilon K Kbar thresholds.- hadron spectroscopy
- upsilon mesons: hadronic decay
- upsilon mesons: cascade decay
- upsilon mesons: width
- new particle: Z(4430)
- meson: exotic
- tetraquark
- charm
- bottom
- numerical calculations
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