Chinese Physics C > 2004, Vol. 28 > Issue(3): 239-244

ρ-ω Interference in J/ψ-Decays and ρ→π π ^-π ⁰Decay

Interdisciplinary Center for Theoretical Study,University of Science and Technology of China,Hefei 230026,China2 Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
We study ρ-ω interference by analyzing J/ψ→π ⁺π ^-π ⁰π ⁰. PDG-2002 data on J/ψ decays into PP and PV (P denotes pseudoscalar mesons; V, vector mesons) are used to fit a generic model which describes the J/ψ decays. From the fits, we obtain anomalously large branching ratio Br(ρ ⁰→π ⁺π ^-π ⁰)≈10 ^－3－10 ^－2. A theoretical analysis for it is also provided, and the prediction is in good agreement with the anomalously large Br(ρ ⁰→π ⁺π ^-π ⁰). By the fit, we also get the η-η′ mixing angle θ= -19.68°±1.49° and the constituent quark mass ratio m _u/m _s≈0.6 which are all reasonable.

References

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LIU Fang, LI Jin, HUANG Yi-Bin and YAN Mu-Lin. ρ-ω Interference in J/ψ-Decays and ρ→π π ^-π ⁰Decay[J]. Chinese Physics C, 2004, 28(3): 239-244.

LIU Fang, LI Jin, HUANG Yi-Bin and YAN Mu-Lin. ρ-ω Interference in J/ψ-Decays and ρ→π π ^-π ⁰Decay[J]. Chinese Physics C, 2004, 28(3): 239-244. shu

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Received: 2003-07-21
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

ρ-ω Interference in J/ψ-Decays and ρ→π π ^-π ⁰Decay

Corresponding author:LIU Fang,

Interdisciplinary Center for Theoretical Study,University of Science and Technology of China,Hefei 230026,China2 Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date:2003-07-21
Accepted Date:1900-01-01
Available Online:2004-03-05

Abstract:We study ρ-ω interference by analyzing J/ψ→π⁺π^-π⁰π⁰. PDG-2002 data on J/ψ decays into PP and PV (P denotes pseudoscalar mesons; V, vector mesons) are used to fit a generic model which describes the J/ψ decays. From the fits, we obtain anomalously large branching ratio Br(ρ⁰→π⁺π^-π⁰)≈10^－3－10^－2. A theoretical analysis for it is also provided, and the prediction is in good agreement with the anomalously large Br(ρ⁰→π⁺π^-π⁰). By the fit, we also get the η-η′ mixing angle θ= -19.68°±1.49° and the constituent quark mass ratio m_u/m_s≈0.6 which are all reasonable.