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Title: Rosenbluth Separation of the π 0 Electroproduction Cross Section Off the Neutron

Here, we report the first longitudinal/transverse separation of the deeply virtual exclusive $$\pi^0$$ electroproduction cross section off the neutron and coherent deuteron. Furthemore, the corresponding four structure functions $$d\sigma_L/dt$$, $$d\sigma_T/dt$$, $$d\sigma_{LT}/dt$$ and $$d\sigma_{TT}/dt$$ are extracted as a function of the momentum transfer to the recoil system at $Q^2$=1.75 GeV$^2$ and $$x_B$$=0.36. The $$ed \to ed\pi^0$$ cross sections are found compatible with the small values expected from theoretical models. The $$en \to en\pi^0$$ cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity GPDs of the nucleon. By combining our results with previous measurements of $$\pi^0$$ electroproduction off the proton, we present a flavor decomposition of the $u$ and $d$ quark contributions to the cross section.
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Publication Date:
Report Number(s):
JLAB-PHY-17-2435; DOE/OR/23177-4128; arXiv:1702.00835
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1702736
Grant/Contract Number:
AC05-060R23177; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
Jefferson Lab Hall A Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1361037
Alternate Identifier(s):
OSTI ID: 1361117; OSTI ID: 1377068