矩分析法与ξ(2220)

Moment Analysis and ξ(2220)

为减少几何接收度的影响,提高精度,我们引进矩的赝标介子角分布H_J(jm,θ)。对于辨别ξ(2220)的自旋为2还是4,要比通常的投影赝标介子角分布W_J(θ)灵敏。我们还给出了矩分析所需的矩,以及直接用矩的关系式表示的螺旋度振幅之比x_J和y_J。

In order to reduce the influence of the geometrical acceptance and improve the precision we introduce the pseudoscalar meson angular distribution of the moment H_J(jm, θ). It is more sensitive than the usual projective pseudosealar meson angular distribution W_J (θ) for determining that the spin of the ξ(2220) is 2 or 4. We also give some moments which are needed for the moment analysis and some relations of moments to represent the helicity amplitude ratios x_J and y_J directly.