Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 24: Electromagnetic and Hadronic Probes III

HK 24.5: Talk

Wednesday, March 10, 2004, 12:00–12:15, B

Compton Scattering off the Deuteron in Chiral Effective Field Theory — •Robert P. Hildebrandt, Harald W. Grießhammer, and Thomas R. Hemmert — Institute for Theoretical Physics (T39), TU München, Germany

Due to the lack of stable single neutron targets for Compton scattering, experimental access to the neutron polarizabilities is much harder than in the proton case. One possible way to determine the neutron polarizabilities is Compton scattering off the deuteron. Therefore, an accurate description of the Chiral Dynamics inside the deuteron is needed, as one has to correct for the proton polarizabilities and binding effects. In this work, we extend Chiral Effective Field Theory calculations of Compton scattering off the deuteron [1] by explicit Δ(1232) degrees of freedom, finding very good agreement with experimental data [2]. We discuss the well-known problem to recover the correct Thomson-limit and show how to solve it [2]. Finally we present our results for fits of the static neutron dipole polarizabilities α_E1ⁿ and β_M1ⁿ to experimental data, which are in good agreement with experimental values and ChEFT predictions [2]. Work supported in part by DFG and BMBF.

• [1] S.R. Beane, M.Malheiro, D.R. Phillips and U. van Kolck,
  [2] Nucl. Phys. A 656, 367.
• [2] R.P. Hildebrandt, H.W. Grießhammer, T.R. Hemmert and
  [2] D.R. Phillips, forthcoming.