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arXiv 1109.0883hep-exhep-ph
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I = 0 C = +1介子(1920 - 2410)MeV

I = 0 C = +1 mesons from 1920 to 2410 MeV

A. V. Anisovich, C. A. Baker, C. J. Batty, D. V. Bugg, C. Hodd, H. C. Lu, V. A. Nikonov, A. V. Sarantsev, V. V. Sarantsev, B. S. Zou

摘要:

一个组合的拟合,以数据的pbar-p湮灭在飞行中的最终状态eta-pizero-pizero,pizero-pizero,eta-eta,eta-etaprime和piminus-piplus。重点在于改进早期的研究η-pizero-pizero拟合数据在9 pbar动量同时和参数一致的两体通道。有证据表明,所有的I=0,C=+ q-qbar状态预期在这个质量范围内。新共振的质量和宽度M、γ报告如下:JPC = 4^{-+}(2328+-38,Gamma=240+-90)MeV,1^{++}(1971+-15,240 +-45)MeV,0^{-+}(2285+-20,325 +-30)MeV,0^{-+}(2010 ^{+35}_{-60},270+-60)MeV。其他共振的质量和宽度的误差也大大减少。所有的状态都接近于激发数与质量平方的平行直线轨迹。

英文摘要:

A combined fit is presented to data on pbar-p annihilation in flight to final states eta-pizero-pizero, pizero-pizero, eta-eta, eta-etaprime and piminus-piplus. The emphasis lies in improving an earlier study of eta-pizero-pizero by fitting data at nine pbar momenta simultaneously and with parameters consistent with the two-body channels. There is evidence for all of the I=0, C=+ q-qbar states expected in this mass range. New resonances are reported with masses and widths M,Gamma as follows: JPC = 4^{-+} (2328+-38, Gamma=240+-90) MeV, 1^{++} (1971+-15, 240+-45) MeV, 0^{-+} (2285+-20, 325+-30) MeV, and 0^{-+} (2010 ^{+35}_{-60}, 270+-60) MeV. Errors on the masses and widths of other resonances are also reduced substantially. All states lie close to parallel straight line trajectories of excitation number v. mass squared.

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