MEASUREMENT OF THE GENERALIZED FORM FACTORS NEAR PION THRESHOLD VIA γ*p → nπ⁺ IN CLAS

We extracted the multipoles near pion threshold for the first time at high momentum transfers (Q²) in the nπ⁺ final state channel. The dominance of the S-wave transverse multipole (E₀₊) is expected in this region, which allows us to access the new generalized form factors G₁, G₂ within the Light-Cone-Sum-Rule (LCSR) framework. In this analysis, we used one of the recent CLAS experimental data sets which utilized the high-energy polarized electron beam on unpolarized proton target using the 4π detector coverage. We measured the differential cross sections and extracted the multipoles using two methods, LCSR and multipole fit. Both methods show consistent results, which are almost Q² independent.