THE PROCESS GAMMA-STAR-GAMMA-STAR-]PI-0 AND THE NONLOCALITY OF CONDENSATES

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作者：
MIKHAILOV, SV
RADYUSHKIN, AV
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来源：
SOVIET JOURNAL OF NUCLEAR PHYSICS-USSR | 1990年 / 52卷 / 04期
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O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We calculate the form factor F-gamma-pi of the transition gamma*gamma* --> pi-0 in the asymptotically leading order in 1/Q2 for an arbitrary asymmetry omega of the heavy photons. The calculations are carried out in a generalized QCD sum-rule method with nonlocal condensates. We find that for the existing value lambda-q2 = <qBAR NABLA 2q>/<qBARq> = 0.4 +/- 0.1 GeV2 of the nonlocality parameter the sum rules work practically for all omega. In this case the form factor F-gamma-pi is especially sensitive to the value of lambda-q2 when the asymmetry is high.
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页码：697 / 703
页数：7
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