Further insights into the ρπ puzzle

  • Based on a systematic investigation of J/ψ(ψ´)→VP, where V and P stand for light vector and pseudoscalar mesons, we identify the role played by the electromagnetic (EM) transitions and intermediate meson loop transitions, which are essential ingredients for understanding the J/ψ and ψ´ couplings to VP. We show that on the one hand, the EM transitions have relatively larger interferences in ψ´→ρπ and K*K+c.c. as explicitly shown by vector meson dominance (VMD). On the other hand, the strong decay of ψ´ receives relatively larger destructive interferences from the intermediate meson loop transitions. By identifying these mechanisms in an overall study of J/ψ(ψ´)→VP, we provide a coherent understanding of the so-called ``ρπ puzzle".
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ZHAO Qiang, LI Gang and CHANG Chao-Hsi. Further insights into the ρπ puzzle[J]. Chinese Physics C, 2010, 34(2): 299-304. doi: 10.1088/1674-1137/34/2/027
ZHAO Qiang, LI Gang and CHANG Chao-Hsi. Further insights into the ρπ puzzle[J]. Chinese Physics C, 2010, 34(2): 299-304.  doi: 10.1088/1674-1137/34/2/027 shu
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Received: 2009-08-27
Revised: 2009-10-09
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Further insights into the ρπ puzzle

    Corresponding author: ZHAO Qiang,

Abstract: Based on a systematic investigation of J/ψ(ψ´)→VP, where V and P stand for light vector and pseudoscalar mesons, we identify the role played by the electromagnetic (EM) transitions and intermediate meson loop transitions, which are essential ingredients for understanding the J/ψ and ψ´ couplings to VP. We show that on the one hand, the EM transitions have relatively larger interferences in ψ´→ρπ and K*K+c.c. as explicitly shown by vector meson dominance (VMD). On the other hand, the strong decay of ψ´ receives relatively larger destructive interferences from the intermediate meson loop transitions. By identifying these mechanisms in an overall study of J/ψ(ψ´)→VP, we provide a coherent understanding of the so-called ``ρπ puzzle".

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