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

GUO Fen-Kun; SHENG Peng-Nian; JIAN Huan-Qing; PING Rong-Gang

Chinese Physics C> 2005, Vol. 29> Issue(12) : 1121-1124

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

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

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Abstract：
The decay process \Upsilon(3S)\to\Upsilon(1S)π^＋π^－ 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 J^P=1^＋ and I=1 is introduced, the ππ invariant mass spectrum and the cosθπ* distribution in the \Upsilon(3S)→\Upsilon(1S)π^＋π^－ process can simultaneously be well-explained, and a good description for other bottomonium π^＋π^－ transitions can be obtained consistently. As a result, the mass and the width of the intermediate state are predicted to be M_X=10.08GeV and Γ_X=0.655GeV, respectively. From the quark content analysis,this state should be a bbqq state.

References

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. Nakano T et al (LEPS Collaboration). Phys. Rev. Lett.,2003, 91: 0120022. BAI J Z et al (BES Collaboration). Phys. Rev., 2000, D62:0320023. Butler F et al (CLEO Collaboration). Phys. Rev., 1994,D49: 404. Alexander J P et al (CLEO Collaboration). Phys. Rev.,1998, D58: 0520045. ZHOU H Y, KUANG Y P. Phys. Rev., 1991, D44: 7566. Chakravarty S, Ko P. Phys. Rev., 1993, D48: 12057. Chakravarty S, Kim S M, Ko P. Phys. Rev., 1993, D48:12128. Chakravarty S, Kim S M, Ko P. Phys. Rev., 1994, D50:3899. Anisovich V V et al. Phys. Rev., 1995, D51: R461910. Mannel T, Urech R. Z. Phys., 1997, C73: 54111. L¨ahde T A, Riska D O. Nucl. Phys., 2002, A707: 42512. Oller J A, Oset E. Nucl. Phys., 1997, A620: 438; 1999,A652: 40713. Oset E, Ramos A. Nucl. Phys., 1998, A635: 9914. GUO F K, SHEN P N, CHANG H C et al. Nucl. Phys.,2005, A761: 26915. Brown L, Cahn R. Phys. Rev. Lett., 1975, 35: 116. YAN M L, WEI Y, ZHUANG T L. Eur. Phys. J., 1999,C7: 6117. Eidelman S et al (Particle Data Group). Phys. Lett., 2004,B592: 1

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2005-03-21
Accepted Date: 1900-01-01
Available Online: 2005-12-05

Abstract: The decay process \Upsilon(3S)\to\Upsilon(1S)π^＋π^－ 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 J^P=1^＋ and I=1 is introduced, the ππ invariant mass spectrum and the cosθπ* distribution in the \Upsilon(3S)→\Upsilon(1S)π^＋π^－ process can simultaneously be well-explained, and a good description for other bottomonium π^＋π^－ transitions can be obtained consistently. As a result, the mass and the width of the intermediate state are predicted to be M_X=10.08GeV and Γ_X=0.655GeV, respectively. From the quark content analysis,this state should be a bbqq state.