https://doi.org/10.1140/epjc/s10052-025-14668-y
Regular Article - Theoretical Physics
High-energy factorization via eigenfunctions of the next-to-leading-order BFKL kernel
1
Dipartimento di Fisica, Università della Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
2
National Centre for Nuclear Research, Pasteura 7, 02-093, Warsaw, Poland
3
INFN, Gruppo Collegato di Cosenza, Arcavacata di Rende, 87036, Cosenza, Italy
a
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Received:
28
May
2025
Accepted:
23
August
2025
Published online:
6
September
2025
Abstract
We present a general formula for the amplitude of forward exclusive hadronic processes in the semihard regime of perturbative Quantum Chromodynamics (QCD), by means of the next-to-leading order eigenfunctions of the Balitsky–Fadin–Kuraev–Lipatov (BFKL) kernel, as constructed by Chirilli and Kovchegov. We discuss some formal subtleties in the check of compatibility with the similar formula based on the use of the leading-order BFKL eigenfunctions. Finally, in the specific case of the electroproduction of two light vector mesons, we consider the numerical stability of the amplitude when one or the other set of eigenfunctions is adopted.
© The Author(s) 2025
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