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arXiv 0704.3896hep-ph
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光子目标求和规则

Sum rule for photon target

E. Bartos, S. Dubnicka, A. Z. Dubnickova, E. A. Kuraev

摘要:

研究了精细结构常数为3阶QED的$γ^*γ$中间态转变为夸克-反夸克的电子与光子零角散射的振幅。利用弹性光子-光子散射振幅的解析性质,导出了电子-光子碰撞中夸克-反夸克对产生微分截面的显式表达式。应用Weizsäcker-Williams类关系,在小转移动量的极限情况下,将夸克电荷的四次方与夸克质量平方之比之和与总$γγ\to 2 jets$截面的积分关系引入到光子靶的求和规则中.

英文摘要:

The amplitude of zero angle scattering of electron on photon in the 3-rd QED order of fine structure constant with $γ^*γ$ intermediate state converting into quark--antiquark is considered. Utilizing analytic properties of elastic photon--photon scattering amplitude an explicit expression for differential cross- section of quark--antiquark pair production at electron-photon collision in peripheral kinematics is derived apparently. Limiting case of small transferred momenta with an application of the Weizsäcker-Williams like relation gives the sum rule for photon target, bringing into the relation the sum of ratios of the four power of the quark charges to squared quark masses with integral over the total $γγ\to 2 jets$ cross--section.

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