Speaker
Description
The EMC effect has been known for almost 40 years but it still needs to be fully understood theoretically and there are essentially no reliable experimental constraints on its flavor dependence. In order to better understand the EMC effect, We propose a clean and precise measurement of the flavor dependence of the EMC effect using parity-violating deep inelastic scattering on a 48Ca target. This measurement will provide an extremely sensitive test for flavor dependence in modifying nuclear pdfs for neutron-rich nuclei. A measurement of the flavor dependence will provide new and vital information and help to explain nucleon modification at the quark level. In addition to helping understand the origin of the EMC effect, a flavor-dependent nuclear pdf modification could significantly impact a range of processes, including neutrino-nucleus scattering, nuclear Drell-Yan processes, or e-A observables at the Electron-Ion Collider.
The parity-violating asymmetry APV from 48Ca using an 11 GeV beam at 80 μA will be measured using the SoLID detector in its PVDIS configuration. In 68 days of data taking, we will reach 0.7-1.3 % statistical precision for 0.2<x<0.7 with 0.6-0.7 % systematic uncertainties. The goal is to make the first measurement of the flavor dependence of the EMC effect. The precision of the measurement will allow for quantification of the flavor-dependent effects, greatly improving our ability to differentiate between models of the EMC effect. The proposal has received conditional approval from JLab PAC50 in 2022.
