Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q**2 = 0.92-GeV**2 and 1.76-GeV**2 - INSPIRE

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Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2 = 0.92-GeV2 and 1.76-GeV**2

Jefferson Lab Hall A

Collaboration

•

G. Laveissiere
(
- Clermont-Ferrand U.
)

Apr, 2004

5 pages

Published in:

Phys.Rev.Lett. 93 (2004) 122001

e-Print:

hep-ph/0404243 [hep-ph]

DOI:

10.1103/PhysRevLett.93.122001

Report number:

JLAB-PHY-04-35

Experiments:

JLAB-E-93-050

View in:

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Abstract:

We report a Virtual Compton Scattering study of the proton at low CM energies. We have determined the structure functions

P_{LL}-P_{TT}/\epsilon

and

P_{LT}

, and the electric and magnetic Generalized Polarizabilities (GPs)

\alpha_E(Q2)

and

\beta_M(Q2)

at momentum transfer Q2= 0.92 and 1.76 GeV2. The electric GP shows a strong fall-off with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a fall-off: this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from

\pi N

intermediate states.

Note:

This paper is result of merging hep-ph/0312293 and hep-ph/0312294

13.60.Fz
electron p: exclusive reaction
photon: electroproduction
Compton scattering: off-shell
p: polarizability
electric
magnetic
photon: polarization
structure function
pi: threshold

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