Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 9: Poster Session: Theory

HK 9.6: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Chiral Magnetism of the Nucleon — •Thomas R. Hemmert¹ and Wolfram Weise^1,2 — ¹Physik Department T39, TU München — ²ECT*, Trento, Italy

We are analysing the quark-mass dependence of the isovector anomalous magnetic moment of the nucleon [1]. Quenched Lattice data for this quantity from the Adelaide group [2] are only available for quark-masses heavier than 20 times the physical light quark masses, making extrapolation schemes necessary to bridge the gap between lattice data and the physical magnetic moments of the nucleon. We report on recent work of such an extrapolation performed with the help of chiral effective field theories, resulting in a simple extrapolation formula for the case of the magnetic moments. We also compare our extrapolation formula with the Pade-formula recently suggested by the Adelaide group [2].

[1] T.R. Hemmert and W. Weise, “Chiral Magnetism of the Nucleon”, forthcoming. Preliminary results are reported in nucl-th/0105051.

[2] D.B. Leinweber, D.H. Lu and A.W. Thomas, Phys.Rev.D60:034014 (1999).

Work supported in part by DFG and BMBF