Neutral Pion Electroproduction in the Resonance Region at High Q**2

Villano, A.N.; Stoler, P.; Bosted, P.E.; Connell, S.H.; Dalton, M.M.; Jones, M.K.; Kubarovsky, V.; Adams, G.S.; Ahmidouch, A.; Arrington, J.

doi:10.1103/PhysRevC.80.035203

Neutral Pion Electroproduction in the Resonance Region at High Q**2

Jun, 2009

40 pages

Published in:

Phys.Rev.C 80 (2009) 035203

e-Print:

0906.2839 [nucl-ex]

DOI:

10.1103/PhysRevC.80.035203

Report number:

JLAB-PHY-09-996

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Abstract: (arXiv)

The process

ep \to e^{\prime}p^{\prime}\pi^0

has been measured at

Q^2

= 6.4 and 7.7 \ufourmomts in Jefferson Lab's Hall C. Unpolarized differential cross sections are reported in the virtual photon-proton center of mass frame considering the process

\gamma^{\ast}p \to p^{\prime}\pi^0

. Various details relating to the background subtractions, radiative corrections and systematic errors are discussed. The usefulness of the data with regard to the measurement of the electromagnetic properties of the well known

\Delta(1232)

resonance is covered in detail. Specifically considered are the electromagnetic and scalar-magnetic ratios

R_{EM}

and

R_{SM}

along with the magnetic transition form factor

G_M^{\ast}

. It is found that the rapid fall off of the

\Delta(1232)

contribution continues into this region of momentum transfer and that other resonances

25.30.Rw
pion production
electroproduction
pi0: electroproduction
electron p: inelastic scattering
form factor: transition: magnetic
electromagnetic
Delta(1232)
differential cross section: energy dependence
radiative correction

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