Neutral current interactions in ep scattering with longitudinally polarised leptons at H1

Abstract

The inclusive deep inelastic cross sections are measured for the neutral current process, e ± p → e ± X, in interactions with longitudinally polarised lepton beams of HERA II at large negative fourmomentum transfer squared Q 2 ≥ 150 GeV 2 . The polarisation asymmetries of the neutral current e − p and e + p cross sections are presented. The cross sections are combined with previously published data from H1 to obtain the most precise unpolarised measurements. The lepton charge asymmetry of the unpolarised cross sections is used to extract the structure function xF γZ 3. The measurements are found to be in agreement with the Standard Model expectations. XVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

Polarized positrons in Jefferson lab electron ion collider (JLEIC)

“…The design considers a balance of machine performance, technical risk, cost and path for future upgrade. In addition to the electron and ion collision as it is carried out in the JLEIC, physicists also found that collision of polarized positron and ion beams provide more capabilities to study the physics world [2,3,4,5,6,7,8,9]. From the accelerator design point view, acceleration, accumulation and store of polarized electron and position have no significant difference, as long as polarities of powered magnets are inversed and some charge-related collective effects are solved.…”