Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 5: Theory I

HK 5.6: Talk

Monday, March 8, 2004, 17:15–17:30, D

Separating long- and short-distance physics in chiral effective field theory — •T.R. Hemmert¹, V. Bernard², and U.-G. Meißner³ — ¹Physik Department T39, TU München — ²LPT, U. Louis Pasteur, Strasbourg — ³HISKP (Th), U. Bonn

We discuss the use of cutoff regularization methods in chiral perturbation theory [1]. We develop a cutoff scheme based on the operator structure of the chiral effective field theory that allows to suppress high momentum contributions in Goldstone boson loop integrals and—by construction—is free of the problems traditional cutoff schemes have with gauge invariance or chiral symmetries. In this scheme momentum modes above the scale of chiral symmetry breaking are effectively transfered into local operators of the effective theory parameterizing short distance physics. As examples we discuss the quark mass dependence of the nucleon mass and of the polarizabilities of the nucleon [2].

[1] V.Bernard, T.R. Hemmert and U.-G. Meißner, [hep-ph/0307115].

[2] T.R. Hemmert and B.R. Holstein, forthcoming.

This work has been supported in part by BMBF and DFG.