2026-06-08T05:59:03Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1009952025-08-28T14:53:19Zcom_20.500.14352_14col_20.500.14352_15

Peset Martín, Clara María Pineda, Antonio 2024-02-09T14:56:57Z 2024-02-09T14:56:57Z 2014 Peset, Clara, y Antonio Pineda. «The Two-Photon Exchange Contribution to Muonic Hydrogen from Chiral Perturbation Theory». Nuclear Physics B, vol. 887, octubre de 2014, pp. 69-111. DOI.org (Crossref), https://doi.org/10.1016/j.nuclphysb.2014.07.027. 0550-3213 10.1016/j.nuclphysb.2014.07.027 https://hdl.handle.net/20.500.14352/100995 1873-1562 https://doi.org/10.1016/j.nuclphysb.2014.07.027 We compute the spin-dependent and spin-independent structure functions of the forward virtual-photon Compton tensor of the proton at using heavy baryon effective theory including the Delta particle. We compare with previous results when existing. Using these results we obtain the leading hadronic contributions, associated to the pion and Delta particles, to the Wilson coefficients of the lepton–proton four fermion operators in NRQED. The spin-independent coefficient yields a pure prediction for the two-photon exchange contribution to the muonic hydrogen Lamb shift, . We also compute the charge, , and Zemach, , moments for . Finally, we discuss the spin-dependent case, for which we compute the difference between the four-fermion Wilson coefficients relevant for hydrogen and muonic hydrogen. eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 International The two-photon exchange contribution to muonic hydrogen from chiral perturbation theory journal article