{pi}NN vertex function in a meson-theoretical model
{pi}NN vertex function in a meson-theoretical model
复制标题
{pi}介子理论模型中的NN顶点函数
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Speth
中科院分区：
文献类型：
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作者：
R. Böckmann;C. Hanhart;O. Krehl;S. Krewald;J. Speth
The {pi}NN vertex function is calculated within a dispersion theoretical approach, including both {pi}{rho} and {pi}{sigma} intermediate states, where the {sigma} meson is an abbreviation for a correlated pion pair in a relative {ital S} wave with isospin I=0. A strong coupling between the {pi}{sigma} and {pi}{rho} states is found. This leads to a softening of the {pi}NN form factor. In a monopole parametrization, a cutoff {Lambda}{approx}800hMeV is obtained as compared to {Lambda}{approx}1000hMeV using {pi}{rho} intermediate states only. {copyright} {ital 1999} {ital The American Physical Society}
The {pi}NN vertex function is calculated within a dispersion theoretical approach, including both {pi}{rho} and {pi}{sigma} intermediate states, where the {sigma} meson is an abbreviation for a correlated pion pair in a relative {ital S} wave with isospin I=0. A strong coupling between the {pi}{sigma} and {pi}{rho} states is found. This leads to a softening of the {pi}NN form factor. In a monopole parametrization, a cutoff {Lambda}{approx}800hMeV is obtained as compared to {Lambda}{approx}1000hMeV using {pi}{rho} intermediate states only. {copyright} {ital 1999} {ital The American Physical Society}