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arXiv 0806.1098hep-phnucl-th
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双光子广义分布振幅

Diphoton Generalized Distribution Amplitudes

M. El Beiyad, B. Pire, L. Szymanowski, S. Wallon

摘要:

通过计算低能高光子虚度区的过程gamma* gamma -> gamma gamma在Born阶和超前对数近似下的振幅,计算了超前阶双光子广义分布振幅。与反常光子结构函数的情况一样,伽玛广义分布振幅表现出典型的\ln Q^2行为,并服从非齐次演化方程。

英文摘要:

We calculate the leading order diphoton generalized distribution amplitude by calculating the amplitude of the process gamma* gamma -> gamma gamma in the low energy and high photon virtuality region at the Born order and in the leading logarithmic approximation. As in the case of the anomalous photon structure functions, the gamma gamma generalized distribution amplitude exhibits a characteristic \ln Q^2 behaviour and obeys inhomogeneous evolution equations.

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