Decay Υ(3S)→Υ(1S)π+π-and a Possible bbqq State

  • The decay process \Upsilon(3S)\to\Upsilon(1S)ππ are re-visited using a Chiral Unitary Theory (ChUT) to include the important ππS wave final state interaction (FSI). It is found that when an additional intermediate state with JP=1 and I=1 is introduced, the ππ invariant mass spectrum and the cosθπ* distribution in the \Upsilon(3S)→\Upsilon(1S)ππ process can simultaneously be well-explained, and a good description for other bottomonium ππ transitions can be obtained consistently. As a result, the mass and the width of the intermediate state are predicted to be MX=10.08GeV and ΓX=0.655GeV, respectively. From the quark content analysis,this state should be a bbqq state.
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GUO Fen-Kun, SHENG Peng-Nian, JIAN Huan-Qing and PING Rong-Gang. Decay Υ(3S)→Υ(1S)π+π-and a Possible bbqq State[J]. Chinese Physics C, 2005, 29(12): 1121-1124.
GUO Fen-Kun, SHENG Peng-Nian, JIAN Huan-Qing and PING Rong-Gang. Decay Υ(3S)→Υ(1S)π+π-and a Possible bbqq State[J]. Chinese Physics C, 2005, 29(12): 1121-1124. shu
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Received: 2005-03-21
Revised: 1900-01-01
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Decay Υ(3S)→Υ(1S)π+π-and a Possible bbqq State

    Corresponding author: GUO Fen-Kun,
  • Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China2 CCASTWorld Lab.,Beijing 100080,China3 Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100080,China4 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China5 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China6 Southwest China Normal University,Chongqing 400715,China

Abstract: The decay process \Upsilon(3S)\to\Upsilon(1S)ππ are re-visited using a Chiral Unitary Theory (ChUT) to include the important ππS wave final state interaction (FSI). It is found that when an additional intermediate state with JP=1 and I=1 is introduced, the ππ invariant mass spectrum and the cosθπ* distribution in the \Upsilon(3S)→\Upsilon(1S)ππ process can simultaneously be well-explained, and a good description for other bottomonium ππ transitions can be obtained consistently. As a result, the mass and the width of the intermediate state are predicted to be MX=10.08GeV and ΓX=0.655GeV, respectively. From the quark content analysis,this state should be a bbqq state.

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