2 GeV左右缺失手性伴侣eta_4的一些迹象
Some indication for a missing chiral partner eta_4 around 2 GeV
摘要:
在欧洲核子研究中心(CERN)对1.9 - 2.4GeV质子-反质子飞行湮灭的分波分析中得到的轻夸克区高位介子具有很高的简并度。这种简并可以解释为由于SU(2)_L * SU(2)_R和U(1)_A对称性与主量子数n + J相结合的有效恢复。在这种情况下,在目前数据中缺失的2和2.3 GeV带中,最高自旋态必须有手征伙伴。在这里,我们重新分析晶体桶的数据,并显示存在的缺失$4^{-+}$状态约2 GeV的指示。这一结果需要进一步的实验研究质子-反质子湮灭和产生反应中的缺失态。
英文摘要:
The high-lying mesons in the light quark sector previously obtained from the partial wave analysis of the proton-antiproton annihilation in flight at 1.9 - 2.4 GeV region at CERN reveal a very high degree of degeneracy. This degeneracy can be explained as due to an effective restoration of both SU(2)_L * SU(2)_R and U(1)_A symmetries combined with a principal quantum number n + J. In this case there must be chiral partners for the highest spin states in the 2 and 2.3 GeV bands presently missing in the data. Here we reanalyze the Crystal Barrel data and show an indication for existence of the missing $4^{-+}$ state around 2 GeV. This result calls for further experimental search of the missing states both in the proton-antiproton annihilation and in the production reactions.
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