Neutron Valence Structure from Nuclear Deep Inelastic Scattering

Segarra, Efrain P.; Schmidt, Axel; Kutz, T.; Higinbotham, D. W.; Piasetzky, E.; Strikman, M.; Weinstein, L. B.; Hen, O.

doi:10.1103/PhysRevLett.124.092002

Neutron Valence Structure from Nuclear Deep Inelastic Scattering

Journal Article · Fri Mar 06 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.092002· OSTI ID:1608976

Segarra, Efrain P. ^[1]; Schmidt, Axel ^[2]; Kutz, T. ^[2]; Higinbotham, D. W. ^[3]; Piasetzky, E. ^[4]; Strikman, M. ^[5]; ^[6]; Hen, O. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); George Washington Univ., Washington, DC (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Tel Aviv Univ., Ramat Aviv (Israel)
Pennsylvania State Univ., University Park, PA (United States)
Old Dominion Univ., Norfolk, VA (United States)

Mechanisms of spin-flavor SU(6) symmetry breaking in Quantum Chromodynamics (QCD) are studied via an extraction of the free neutron structure function from a global analysis of deep inelastic scattering (DIS) data on the proton and on nuclei from $A = 2$ (deuterium) to 208 (lead). Modification of the structure function of nucleons bound in atomic nuclei (known as the EMC effect) are consistently accounted for within the framework of a universal modification of nucleons in short-range correlated (SRC) pairs. Our extracted neutron-to-proton structure function ratio $$F_2^n/F_2^p$$ becomes constant for $$x_B \ge 0.6$$, equalling $$0.47 \pm 0.04$$ as $$x_B \rightarrow 1$$, in agreement with theoretical predictions of perturbative QCD and the Dyson Schwinger equation, and in disagreement with predictions of the Scalar Diquark dominance model. Finally, we also predict $$F_2^{^3\mathrm{He}}/F_2^{^3\mathrm{H}}$$, recently measured, yet unpublished, by the MARATHON collaboration, the nuclear correction function that is needed to extract $$F_2^n/F_2^p$$ from $$F_2^{^3\mathrm{He}}/F_2^{^3\mathrm{H}}$$, and the theoretical uncertainty associated with this extraction.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-06OR23177; FG02-93ER40771; FG02-94ER40818; FG02-96ER40960

OSTI ID:: 1608976

Alternate ID(s):: OSTI ID: 1603743

Report Number(s):: DOE/OR/23177--4957; JLAB-PHY--20-3176; arXiv:1908.02223

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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