Extraction of the higher-twist parton distribution e(x) from CLAS data

We present the first point-by-point extraction of a twist-3 PDF. The scalar PDF, e(x), is accessed through the analysis of the data for the sin phi(R)-moment of the beam-spin asymmetry for dihadron production in semi-inclusive DIS off proton target at CLAS and CLAS12. The dihadron formalism allows for use of collinear framework, hence calling for a minimal set of approximations and hypotheses. The extracted PDF e(x) carries insights into the physics of the largely-unexplored quark-gluon correlations, and its fast Mellin moment is related to the marginally known scalar charge of the nucleon. We show that the proton flavor combination of the scalar PDF is nonzero at more than 74% probability.

Automated summary

We present the first point-by-point extraction of a twist-3 PDF by analyzing the beam-spin asymmetry data for dihadron production in semi-inclusive DIS. The extracted scalar PDF provides insights into the physics of quark-gluon correlations and has implications for the scalar charge of the nucleon.