Nonminimal coupling contribution to DIS at low x in Holographic QCD

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Amorim, A (Author) Other; Quevedo, RC (Author) Other; Costa, MS (Author) FCUP

Journal

Title: Physical Review D

Vol. 98

ISSN: 2470-0010

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-00P-07K

DOI: 10.1103/physrevd.98.026016

Abstract (EN): We consider the effect of including a nonminimal coupling between a U(1) vector gauge field and the graviton Regge trajectory in holographic QCD models. This coupling describes the QCD interaction between the quark bilinear electromagnetic current and the Pomeron. We test this new coupling against DIS data at low Bjorken x and obtain an excellent fit with a chi squared of 1.1 over a very large kinematical range in the photon virtuality Q(2) < 400 GeV2 and for x < 10(-2). The scale of the new dimension full coupling, which arises from integrating higher spin fields, is of order 1-10 GeV. This value matches precisely the expectations from effective field theory, which indicate that such corrections are controlled by the mass gap between the spin two and spin four glueballs that are described holographically by the graviton and spin four field in the graviton Regge trajectory, respectively.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8