Regarding the axial-vector mesons
The implications of the f1(1285)-f1(1420) mixing for the K1(3P1)- K1(1P1) mixing angle are investigated. Based on the f1(1285)-f1(1420) mixing angle ∼ 50° suggested from the analysis for a substantial body of data concerning the f1(1420) and f1(1285), the masses of the K1(3P1) and K1(1P1) are determined to be ∼ 1307.35±0.63 MeV and 1370.03±9.69 MeV, respectively, which therefore suggests that the K1(3P1)- K1(1P1) mixing angle is about ±(59.55±2.81)°. Also, it is found that the mass of the h′1(1P1) (mostly of s¯) state is about 1495.18±8.82 MeV. Comparison of the predicted results and the available experimental information of the h1(1380) shows that without further confirmation on the h1(1380), the assignment of the h1(1380) as the s¯ member of the 1P1 meson nonet may be premature.
PACS.14.40.Ev Other strange mesons 12.40.Yx Hadron mass models and calculations
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