A New measurement of the structure functions P(LL) - P(TT)/ epsilon and P(LT) in virtual Compton scattering at Q**2 = 0.33 (GeV/c)**2 - INSPIRE

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A New measurement of the structure functions P(LL) - P(TT)/ epsilon and P(LT) in virtual Compton scattering at Q2 = 0.33 (GeV/c)2

A1

Collaboration

•

P. Janssens
(
- Gent U.
)

Mar, 2008

8 pages

Published in:

Eur.Phys.J.A 37 (2008) 1

e-Print:

0803.0911 [nucl-ex]

DOI:

10.1140/epja/i2008-10609-3

Experiments:

MAINZ-A1

View in:

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Abstract: (arXiv)

The cross section of the

ep \to e' p' \gamma

reaction has been measured at

Q^2 = 0.33

(GeV/c)

^2

. The experiment was performed using the electron beam of the MAMI accelerator and the standard detector setup of the A1 Collaboration. The cross section is analyzed using the low-energy theorem for virtual Compton scattering, yielding a new determination of the two structure functions P_LL}-P_{TT}/epsilon and

P_{LT}

which are linear combinations of the generalized polarizabilities of the proton. We find somewhat larger values than in the previous investigation at the same

Q^2

. This difference, however, is purely due to our more refined analysis of the data. The results tend to confirm the non-trivial

Q^2

-evolution of the generalized polarizabilities and call for more measurements in the low-

Q^2

region (

\le

1 (GeV/c)

^2

).

Note:

9 pages, 10 figures. EPJA version. slight revisions in the text and figures

13.60.Fz
25.30.Rw
14.20.Dh

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