Isovector EMC Effect from Global QCD Analysis with MARATHON Data.
- Resource Type
- Academic Journal
- Authors
- Cocuzza C; Department of Physics, SERC, Temple University, Philadelphia, Pennsylvania 19122, USA.; Keppel CE; Jefferson Lab, Newport News, Virginia 23606, USA.; Liu H; Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.; Melnitchouk W; Jefferson Lab, Newport News, Virginia 23606, USA.; Metz A; Department of Physics, SERC, Temple University, Philadelphia, Pennsylvania 19122, USA.; Sato N; Jefferson Lab, Newport News, Virginia 23606, USA.; Thomas AW; CSSM and CoEPP, Department of Physics, University of Adelaide South Australia 5005, Australia.
- Source
- Publisher: American Physical Society Country of Publication: United States NLM ID: 0401141 Publication Model: Print Cited Medium: Internet ISSN: 1079-7114 (Electronic) Linking ISSN: 00319007 NLM ISO Abbreviation: Phys Rev Lett Subsets: PubMed not MEDLINE; MEDLINE
- Subject
- Language
- English
We report the results of a Monte Carlo global QCD analysis of unpolarized parton distribution functions (PDFs), including for the first time constraints from ratios of ^{3}He to ^{3}H structure functions recently obtained by the MARATHON experiment at Jefferson Lab. Our simultaneous analysis of nucleon PDFs and nuclear effects in A=2 and A=3 nuclei reveals the first indication for an isovector nuclear EMC effect in light nuclei. We find that while the MARATHON data yield relatively weak constraints on the F_{2}^{n}/F_{2}^{p} neutron to proton structure function ratio and on the d/u PDF ratio, they suggest an enhanced nuclear effect on the d-quark PDF in the bound proton, questioning the assumptions commonly made in nuclear PDF analyses.