QCD Sum Rule Study of π1S States

摘要

We study the states π1 (1600) and π1 (2015) in the QCD sum rule.We classify the tetraquark currents of the quantum numbers IGJPC=1-1-+,and find that the flavor structure (3 (×) -6)(+) (6(×)3) is preferred when using a diquark-antidiquark construction.By using both the SVZ and finite energy sum rules,we obtain a mass around 1.6 and 2.0 GeV,for the states with the quark contents qqqq and qsqs,respectively.We also study their decay patterns.