Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-04-27
Phys.Rev.Lett.93:122001,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 Figs. Version for PRL after PRL cancelled their request for reducing length of paper
Scientific paper
10.1103/PhysRevLett.93.122001
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.
Laveissière G.
The Jefferson Lab Hall A Collaboration
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