论文标题
中间形式中的非扰动夸克 - 易夸克相互作用
Nonperturbative quark-antiquark interactions in mesonic form factors
论文作者
论文摘要
硬性独家QCD流程的现有理论基于两个假设：（i）$ cractization $ to $ hard \，阻止$ times $ times light前部分配振幅（da's）； （ii）在硬块内使用扰动gluon交换。但是，与DIS和JET物理学不同，分解块中涉及的特征动量转移$ Q $还不够大，以至于该理论在现象学上成功。在这项工作中，我们通过明确计算$ instanton诱导的$对硬块的贡献来重新审视后一个假设（ii），并表明它们对载体，标量和重力形式的贡献很大，标量，标量和矢量介子的介于动量转移的广泛范围。
The existing theory of hard exclusive QCD processes is based on two assumptions: (i) $factorization$ into a $hard\,block$ times light front distribution amplitudes (DA's); (ii) use of perturbative gluon exchanges within the hard block. However, unlike DIS and jet physics, the characteristic momentum transfer $Q$ involved in the factorized block is not large enough for this theory to be phenomenologically successful. In this work, we revisit the latter assumption (ii), by explicitly calculating the $instanton-induced$ contributions to the hard block, and show that they contribute substantially to the vector, scalar and gravitational form factors of the pseudoscalar, scalar and vector mesons, over a wide range of momentum transfer.
