erturbative structure of two- and four-point functions of color charge in a non-Gaussian small-x actio

Autor(es)

Giannini, V, Andre ; Nara, Yasushi ^[1]

Afiliação do(s) autor(es)

^[1] Akita Int Univ, Yuwa, Akita 0101292 - Japan

• Tipo de documento: Artigo Científico
• Fonte: EUROPEAN PHYSICAL JOURNAL C; v. 82, n. 2 FEB 2022.
• Citações Web of Science: 0

Resumo

We compute the perturbative expansion of the two- and four-point functions of color charges in the Color Glass Condensate framework considering the quartic correction to the McLerran-Venugopalan (MV) model of Gaussian color charge fluctuations. Expressions for these correlators in the perturbative expansion for small and large non-Gaussian color charge fluctuations are derived for arbitrary orders in perturbation theory. We explicitly show that the perturbative series does not converge at higher orders as expected. We apply the Borel-Pade resummation method to our problem to construct a convergent series. It is shown that the fully non-perturbative solution can be described by the Borel-Pade approximants constructed from the first few terms of the perturbative series for small non-Gaussian fluctuations. (AU)

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