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Improving the convergence of the chiral expansion for nuclear forces I: Peripheral phases

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arxiv nucl-th/0304037 v2 pith:RQEIPETO submitted 2003-04-14 nucl-th hep-ph

Improving the convergence of the chiral expansion for nuclear forces I: Peripheral phases

Evgeny Epelbaum , Walter Gl\"ockle , Ulf-G. Mei{\ss}ner This is my paper
classification nucl-th hep-ph
keywords chiralregularizationallowsangularcalculationcomparedconsistentconstraints
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the two-pion exchange potential at next-to-next-to-leading order in chiral effective field theory. We propose a new cut-off scheme for the pion loop integrals based on spectral function regularization. We show that this method allows for a consistent implementation of constraints from pion-nucleon scattering. It leads to a much improved description of the partial waves with angular momentum l \geq 2 as compared to the calculation utilizing dimensional regularization.

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