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WL van Neerven 《Pramana》2000,55(1-2):101-111
We present some techniques which have been developed recently or in the recent past to compute Feynman graphs beyond one-loop
order. These techniques are useful to compute the three-loop splitting functions in QCD and to obtain the complete second
order QED corrections to Bhabha scattering. 相似文献
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We demonstrate an experimental technique for isolating and enhancing quadrupolar second-harmonic generation in isotropic materials by using two orthogonally polarized laser beams that create wavelength-scale, forward-radiating gradients in the second-harmonic polarization. 相似文献
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