Abstract
High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We report here a high precision multidimensional study of single π^{+} SIDIS data over a large kinematic range in Bjorken x, fractional energy, and transverse momentum of the hadron as well as photon virtualities Q^{2} ranging from 1-7 GeV^{2}. In particular, the structure function ratio F_{LU}^{sinϕ}/F_{UU} has been determined, where F_{LU}^{sinϕ} is a twist-3 quantity that can reveal novel aspects of emergent hadron mass and quark-gluon correlations within the nucleon. The data's impact on the evolving understanding of the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing transverse momentum dependent parton distribution functions.
Highlights
18INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy 19INFN, Sezione di Torino, 10125 Torino, Italy 20INFN, Sezione di Pavia, 27100 Pavia, Italy
We report here a high precision multidimensional study of single πþ semi-inclusive deep inelastic scattering (SIDIS) data over a large kinematic range in Bjorken x, fractional energy, and transverse momentum of the hadron as well as photon virtualities Q2 ranging from 1–7 GeV2
Ensuing decades of measurements via deep inelastic scattering (DIS) of lepton beams off nucleons have charted the nucleon’s gluon and quark momentum distributions in terms of one-dimensional (1D) parton distribution functions (PDFs) [3–5]
Summary
Ensuing decades of measurements via deep inelastic scattering (DIS) of lepton beams off nucleons have charted the nucleon’s gluon and quark momentum distributions in terms of one-dimensional (1D) parton distribution functions (PDFs) [3–5]. A powerful tool for studying nucleon structural distributions in the plane transverse to its light-front (longitudinal) direction of motion is provided by semi-inclusive DIS (SIDIS), which involves measuring at least one specified hadron in the final state plus the scattered lepton, see Fig. 1. In the one-photon exchange approximation beam SSAs (ALU) are defined : ALUðz; PT; φ; xB; Q2Þ 1⁄4 ddσσþþ þ− ddσσ−−
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