Testing the RG Running of the Leptonic Dirac CP Phase with Reactor Neutrinos

Shao-Feng Ge; Chui-Fan Kong; Pedro Pasquini

doi:10.1103/PhysRevD.111.115031

paper

Testing the RG Running of the Leptonic Dirac CP Phase with Reactor Neutrinos

arXiv:2411.18251 · doi:10.1103/PhysRevD.111.115031

Abstract

We propose the possibility of using the near detector at reactor neutrino experiments to probe the renormalization group (RG) running effect on the leptonic Dirac CP phase $I^´_{D}$ . Although the reactor neutrino oscillation cannot directly measure $I^´_{D}$ , it can probe the deviation $I^ I^´ \equiv I^´_{D} (Q_{d}^{2}) - I^´_{D} (Q_{p}^{2})$ caused by the RG running. Being a key element, the mismatched momentum transfers at neutrino production ( $Q_{p}^{2}$ ) and detection ( $Q_{d}^{2}$ ) processes can differ by two orders. We illustrate this concept with the upcoming Taishan Antineutrino Observatory (TAO, also known as JUNO-TAO) experiment and obtain the projected sensitivity to the CP RG running beta function $I^_{I^}^{2} ´$ .

8 pages, 4 figures. Published version in PRD