Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 24: Elektromagnetische und Hadronische Proben

HK 24.2: Vortrag

Dienstag, 8. März 2005, 14:30–14:45, TU MA001

Neutron Polarizabilities from Deuteron Compton Scattering — •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 by including explicit Δ(1232) degrees of freedom [1], finding very good agreement with experimental data, including the often discussed SAL-data measured at a photon energy of 95 MeV. We further discuss the well-known problem to recover the correct Thomson-limit in ChEFTs and show how to solve it [2]. This leads us towards a consistent description of deuteron Compton scattering below the pion mass and enables us to perform high-precision fits of the isoscalar nucleon polarizabilities to deuteron Compton data. Work supported in part by DFG and BMBF.

• [1] R.P. Hildebrandt, H.W. Grießhammer, T.R. Hemmert, D.R. Phillips,
  [1] nucl-th/0405077, accepted for publication at Eur. Phys. J. A.
• [2] R.P. Hildebrandt, H.W. Grießhammer, T.R. Hemmert, in preparation.