Anomalous dimensions from soft Regge constants

Moult, Ian; Raman, Sanjay; Ridgway, Gregory; Stewart, Iain W.

doi:10.1007/jhep05(2023)025

Title: Anomalous dimensions from soft Regge constants

Journal Article · Wed May 03 00:00:00 EDT 2023 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep05(2023)025· OSTI ID:1991324

Moult, Ian ^[1]; Raman, Sanjay ^[2]; Ridgway, Gregory ^[2]; Stewart, Iain W. ^[2]

Yale University, New Haven, CT (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

Using an effective field theory (EFT) formalism for forward scattering, we reconsider the factorization of 2 → 2 scattering amplitudes in the Regge limit. Expanding the amplitude in gauge invariant operators labelled by the number of Glauber exchanges, allows us to further factorize the standard impact factors into separate collinear and soft functions. The soft functions are universal, and describe radiative corrections to the Reggeized gluon states exchanged by the collinear projectiles. Remarkably, we find that the one-loop soft function for the single Reggeized gluon state is given to O(ϵ) in terms of the two-loop cusp and two-loop rapidity anomalous dimensions. We argue that this iterative structure follows from the simple action of crossing symmetry in the forward scattering limit, which in the EFT allows us to replace the divergent part of a soft loop by a much simpler Glauber loop. We use this correspondence to provide a simple calculation of the two-loop Regge trajectory using the EFT. We then explore its implications at higher perturbative orders, and derive the maximally matter dependent contributions to the Regge trajectory to all loop orders, i.e. the terms ~ α$$^{k+1}_{s}$$n$$^{k}_{f}$$ for any k, where n_f is the number of massless flavors. These simplifications suggests that the EFT approach to the Regge limit will be helpful to explore and further understand the structure of the Regge limit.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Simons Foundation

Grant/Contract Number:: SC0011090; 327942

OSTI ID:: 1991324

Journal Information:: Journal of High Energy Physics (Online), Vol. 2023, Issue 5; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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