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2016

Improved quasi parton distribution through Wilson line renormalization

Chen, Jiunn-Wei, Ji, Xiangdong, Zhang, Jian-Hui

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Recent developments showed that hadron light-cone parton distributions could be directly extracted from spacelike correlators, known as quasi parton distributions, in the large hadron momentum limit.

Unlike the normal light-cone parton distribution, a quasi parton distribution contains ultraviolet (UV) power divergence associated with the Wilson line self energy.
We show that to all orders in the coupling expansion, the power divergence can be removed by a "mass" counterterm in the auxiliary $z$-field formalism, in the same way as the renormalization of power divergence for an open Wilson line.
After adding this counterterm, the quasi quark distribution is improved such that it contains at most logarithmic divergences.

Improved quasi parton distribution through Wilson line renormalization · Around

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