Analytical evaluation of elastic lepton-proton two-photon exchange in chiral perturbation theory Poonam Choudhary, Udit Raha, Fred Myhrer and Dipankar Chakrabarti Eur. Phys. J. A, 60 3 (2024) 69 Published online: 19 March 2024 DOI: 10.1140/epja/s10050-023-01207-0