TY  - JOUR
AU  - Gil-Dominguez, F.
AU  - Alarcon, J. M.
AU  - Weiss, C.
PY  - 2023
DA  - 2023//
TI  - Proton charge radius extraction from muon scattering at MUSE using dispersively improved chiral effective field theory
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 074026
EP  - 14pp
VL  - 108
IS  - 7
PB  - Amer Physical Soc
AB  - The MUSE experiment at Paul Scherrer Institute will perform the first measurement of low-energy muon-proton elastic scattering (muon lab momenta 115-210 MeV) with the aim of determining the proton charge radius. We study the prospects for the proton radius extraction using the theoretical framework of dispersively improved chiral effective field theory (DI.EFT). It connects the proton radii with the finite-Q(2) behavior of the form factors through complex analyticity and enables the use of data up to Q(2) similar to 0.1 GeV2 for radius extraction. We quantify the sensitivity of the μp cross section to the proton charge radius, the theoretical uncertainty of the cross section predictions, and the size of two-photon exchange corrections. We find that the optimal kinematics for radius extraction at MUSE is at momenta 210 MeV and Q(2) similar to 0.05-0.08 GeV2. We compare the performance of electron and muon scattering in the same kinematics. As a by-product, we obtain explicit predictions for the μp and ep cross sections at MUSE as functions of the assumed value of the proton radius.
SN  - 2470-0010
UR  - https://arxiv.org/abs/2306.01037
UR  - https://doi.org/10.1103/PhysRevD.108.074026
DO  - 10.1103/PhysRevD.108.074026
LA  - English
N1  - WOS:001193674200003
ID  - Gil-Dominguez_etal2023
ER  -