The two-photon exchange contribution to muonic hydrogen from chiral perturbation theory. (English) Zbl 1325.81194
Summary: We compute the spin-dependent and spin-independent structure functions of the forward virtual-photon Compton tensor of the proton at \(\mathcal{O}(p^3)\) 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, \(\Delta E_{\text{TPE}}(\pi \& \Delta) = 34(13) \mu\text{eV}\). We also compute the charge, \(\langle r^n \rangle\), and Zemach, \(\langle r^n \rangle_{(2)}\), moments for \(n \geq 3\). 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.
MSC:
| 81V35 | Nuclear physics |
| 81V05 | Strong interaction, including quantum chromodynamics |
| 81V45 | Atomic physics |
| 81V10 | Electromagnetic interaction; quantum electrodynamics |
| 81U05 | \(2\)-body potential quantum scattering theory |
| 81T15 | Perturbative methods of renormalization applied to problems in quantum field theory |
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