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Measurement of the generalized polarizabilities of the proton in virtual compton scattering at $Q^2$ = 0.92 and 1.76 Gev$^2$
- Source :
- Physical Review Letters, Physical Review Letters, 2004, 93, 122001 (5 p.). ⟨10.1103/PhysRevLett.93.122001⟩, Physical Review Letters, American Physical Society, 2004, 93, 122001 (5 p.). ⟨10.1103/PhysRevLett.93.122001⟩
- Publication Year :
- 2004
- Publisher :
- HAL CCSD, 2004.
-
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.<br />Comment: 4 pages, 2 Figs. Version for PRL after PRL cancelled their request for reducing length of paper
Details
- Language :
- English
- ISSN :
- 00319007 and 10797114
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, Physical Review Letters, 2004, 93, 122001 (5 p.). ⟨10.1103/PhysRevLett.93.122001⟩, Physical Review Letters, American Physical Society, 2004, 93, 122001 (5 p.). ⟨10.1103/PhysRevLett.93.122001⟩
- Accession number :
- edsair.doi.dedup.....6d8949fd4f52a9eadf6ac01b85d41d3f
- Full Text :
- https://doi.org/10.1103/PhysRevLett.93.122001⟩