Atomic nuclei are made of protons and neutrons, themselves composed of quarks and gluons.
Understanding how the nuclear environment affects the quark-gluon structure of bound nucleons is an outstanding challenge. While the first evidence for such impact, known as the “EMC effect”, was observed over 40 years ago [1], a generally accepted explanation of the dynamics driving it is still lacking.
I will present new high-energy electron-scattering data that, combined with existing data, indicate correlation between the EMC effect and the structure modification of close-proximity nucleons.
A global analysis of deep inelastic scattering (DIS) data on the proton and on nuclei from A = 2 (deuterium) to 208 (lead) presented here, quantify the modification of the structure function of nucleons bound in atomic nuclei (the EMC effect) within the framework of a universal modification of nucleons in short-range correlated (SRC) pairs. It also allows extracting neutron-to-proton structure function ratio (Fn/Fp) with smaller uncertainties than previous extractions.
[1] EMC effect = European Muon Collaboration effect
The ratio of the nucleon structure functions F2N for iron and deuterium
J.J. Aubert et al., European Muon Collaboration, Phys. Lett. B 123 (1983), p. 275.
The coffee break before the seminar will be organized at DPhN b.703 in room 125.
This seminar is given in the framework of the ESNT workshop on “Quantitative Challenges in Short-Range Correlations in nuclei”
https://esnt.cea.fr/Phocea/Page/index.php?id=112
