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  • Letter
  • Open Access

Finite system size correction to NLO scattering in ϕ4 theory

W. A. Horowitz*

J. F. Du Plessis†

  • Department of Physics, University of Cape Town, Rondebosch 7701, South Africa

  • Department of Physics, University of Stellenbosch, Matieland, 7602, South Africa

  • *wa.horowitz@uct.ac.za
  • †23787295@sun.ac.za

Phys. Rev. D 105, L091901 – Published 9 May, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L091901

Abstract

We compute 2→2 scattering in massive ϕ4 theory on R1,m×Tn to NLO. We perform the calculations using “denominator regularization” instead of the usual dimensional regularization, which allows for asymmetric configurations of the Tn. We give a transparent derivation of and equation for the analytic continuation of the generalized Epstein zeta function. We show that the optical theorem is satisfied and generalize a conjecture by Hardy on square counting functions. We comment on the implications.

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