Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/133995
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Type: | Journal article |
Title: | Isovector EMC effect from global QCD analysis with MARATHON data |
Author: | Cocuzza, C. Keppel, C.E. Liu, H. Melnitchouk, W. Metz, A. Sato, N. Thomas, A.W. |
Citation: | Physical Review Letters, 2021; 127(24):242001-1-242001-6 |
Publisher: | American Physical Society (APS) |
Issue Date: | 2021 |
ISSN: | 0031-9007 1079-7114 |
Statement of Responsibility: | C. Cocuzza, C.E. Keppel, H. Liu, W. Melnitchouk, A. Metz, N. Sato, and A.W. Thomas |
Abstract: | 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 ³He to ³H 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(n)(2)/F(p)(2) 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. |
Keywords: | Jefferson Lab Angular Momentum (JAM) Collaboration |
Rights: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³. |
DOI: | 10.1103/physrevlett.127.242001 |
Grant ID: | http://purl.org/au-research/grants/arc/DP180100497 |
Published version: | http://dx.doi.org/10.1103/physrevlett.127.242001 |
Appears in Collections: | Physics publications |
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