Rosenbluth Separation of the π
Phys Rev Lett
; 118(22): 222002, 2017 Jun 02.
Article
em En
| MEDLINE
| ID: mdl-28621966
ABSTRACT
We report the first longitudinal-transverse separation of the deeply virtual exclusive π^{0} electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dσ_{L}/dt, dσ_{T}/dt, dσ_{LT}/dt, and dσ_{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 edâedπ^{0} cross sections are found compatible with the small values expected from theoretical models. The enâenπ^{0} cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity generalized parton distributions of the nucleon. By combining these results with previous measurements of π^{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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MEDLINE
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En
Ano de publicação:
2017
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Article