Measurement of the η–η′ mixing angle in π− and K− beams with the GAMS-4π Spectrometer
Measurement of the η–η′ mixing angle in π− and K− beams with the GAMS-4π Spectrometer
复制标题
使用 GAMS-4π 光谱仪测量 π− 和 K− 光束中的 η–η′ 混合角
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
G. Khaustov
中科院分区：
文献类型：
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作者：
S. Donskov;V. Kolosov;A. Lednev;Y. Mikhailov;V. Polyakov;V. Samoylenko;G. Khaustov
在高统计实验中，用GAMS-4型π谱仪测量了η-η′混合角。在32.5 GeV/c π-和K-束流中通过电荷交换反应产生η '和η介子。使用π−和K−梁可以研究|ηq和|介子波函数的ηs π分量。π−束在t′=0（GeV/c）2处的截面比为Rπ（η′/η）=0.54±0.04，混合角θ P=（36.3±1.0）<$。对于K−梁，RK（η′/η）=1.27±0.15。发现η′中的胶子含量为sin ~ 2 <$G=0.17±0.07。
The η–η′ mixing angle has been measured with the GAMS-4π spectrometer in a high statistics experiment. η′ and η mesons were generated with charge–exchange reactions in 32.5 GeV/c π− and K− beams. Using both π− and K− beams allows the study of the |ηq〉 and |ηs〉 components of the meson wave function. The cross section ratio at t′=0 (GeV/c)2 in the π− beam is Rπ(η′/η)=0.54±0.04, and the mixing angle ϕP=(36.3±1.0)∘. For the K− beam the ratio is RK(η′/η)=1.27±0.15. It was found that the gluonium content in η′ is sin2ϕG=0.17±0.07.