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What do we learn from the ρ-π puzzle

What do we learn from the ρ-π puzzle
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摘要 The experimental observation indicates that the branching ratio of ψ'→ρπ is very small while the ρ-π channel is a main one in J/ψ decays. To understand the puzzle, various interpretations have been proposed. Meanwhile according to the hadronic helicity selection rule, this decay mode should be suppressed. Numerical calculations are needed to determine how it is suppressed. We calculate the branching ratios of J/ψ→ρπ and ππ in the framework of QCD. The results show that the branching ratios are proportional to (mu+md/MJ/ψ)^2 for the ρπ mode and (mu-md/MJ/ψ)^2 for the ππ mode which is isospin violated. The theoretical prediction of the ratio of J/ ψ→ρπ is smaller than data, but not too small to invoke a completely new mechanism. Thus the puzzle is still standing even though we learn much knowledge towards the puzzle and this will help to finally interpret the puzzle and then gain a deeper insight to the heavy quarkonia. The experimental observation indicates that the branching ratio of ψ'→ρπ is very small while the ρ-π channel is a main one in J/ψ decays. To understand the puzzle, various interpretations have been proposed. Meanwhile according to the hadronic helicity selection rule, this decay mode should be suppressed. Numerical calculations are needed to determine how it is suppressed. We calculate the branching ratios of J/ψ→ρπ and ππ in the framework of QCD. The results show that the branching ratios are proportional to (mu+md/MJ/ψ)^2 for the ρπ mode and (mu-md/MJ/ψ)^2 for the ππ mode which is isospin violated. The theoretical prediction of the ratio of J/ ψ→ρπ is smaller than data, but not too small to invoke a completely new mechanism. Thus the puzzle is still standing even though we learn much knowledge towards the puzzle and this will help to finally interpret the puzzle and then gain a deeper insight to the heavy quarkonia.
作者 李学潜
机构地区 Department of Physics
出处 《Chinese Physics C》 SCIE CAS CSCD 2010年第2期267-269,共3页 中国物理C(英文版)
基金 Supported by National Natural Science Foundation of China Special Fund of Education Ministry of China for the PhD Programs
关键词 ρ-π puzzle hadronic helicity conservation final state interaction ρ-π puzzle, hadronic helicity conservation, final state interaction
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参考文献12

  • 1Rosner J L. Phys. Rev. D, 2001, 64:094002.
  • 2Suzuki M. Phys. Rev. D, 2001, 63: 054021, hep-ph/0006296.
  • 3LI X Q, Bugg D V, ZOU B S. Phys. Rev. D, 1997,55:1421.
  • 4LIU X, ZENG X, LI X. Phys. Rev. D, 2006, 74:074003.
  • 5LI G, LI T, LI X, MAW. Nucl. Phys. B, 2008, 727: 301.
  • 6LI T, ZHAO S, LI X. Nulc. Phys. A, 2009, 828:125.
  • 7Brodsky S, Lepage G. Phys. Rev. D, 1981, 24: 2848.
  • 8Brambilla N et al. Heavy Quarkonium Physics, hep-ph/0412158.
  • 9MO X H, YUAN C Z, WANG P. arXiv:hep-ph/0611214.
  • 10ZHAO Q, LI G, CHANG C H. Phys. Lett. B, 2007, 645: 173.

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