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Threshold pion electroproduction in chiral perturbation theory

V. Bernard
(
- Strasbourg, CRN
)
,
Norbert Kaiser
(
- Munich, Tech. U.
)
,
T.S.H. Lee
(
- Argonne, PHY
)
,
Ulf-G. Meissner
(
- Strasbourg, CRN and
- Bern U.
)

Oct, 1993

43 pages

Published in:

Phys.Rept. 246 (1994) 315-363

e-Print:

hep-ph/9310329 [hep-ph]

DOI:

10.1016/0370-1573(94)90088-4

Report number:

BUTP-93-23,
CRN-93-45

View in:

ADS Abstract Service

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Abstract: (cern)

Electroproduction of pions on the nucleon near the threshold is analyzed within the framework of baryon chiral perturbation theory. We give a thorough discussion of the low--energy theorems related to charged and neutral electropionproduction. It is shown how the axial radius of the nucleon can be related to the S--wave multipoles

E_{0+}~{(-)}

and

L_{0+}~{(-)}

. The chiral perturbation theory calculations of the

\gamma~\star p \to \pi~0 p

reaction are found to be in good agreement with the recent near threshold data. We also discuss the influence of some isospin--breaking effects in this channel. For future experimental tests of the underlying chiral dynamics, extensive predictions of differential cross sections and multipole amplitudes are presented.

Note:

44pp, TeX, 15 figures available upon request, BUTP-93/23 and CRN 93-45

electron nucleon: interaction
interaction: electron nucleon
pi: electroproduction
electroproduction: pi
threshold
perturbation theory: chiral
effective Lagrangian
Born approximation
partial wave analysis: multipole
isospin: violation

References(39)

Figures(0)

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