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Casimir squared correction to the standard rotator Hamiltonian for the O(n) sigma-model in the delta-regime

( 2004 ) 1881 [hep-th/0309009] [INSPIRE]. [5] F. Niedermayer and P. Weisz , Isospin susceptibility in the O(n) -model in the delta-regime , [6] N. Gromov , V. Kazakov and P. Vieira , Finite volume spectrum

Isospin susceptibility in the O(n) sigma-model in the delta-regime

We compute the isospin susceptibility in an effective O(n) scalar field theory (in d = 4 dimensions), to third order in chiral perturbation theory (χPT) in the delta-regime using the quantum mechanical rotator picture. This is done in the presence of an additional coupling, involving a parameter η, describing the effect of a small explicit symmetry breaking term (quark mass). For...

Massless sunset diagrams in finite asymmetric volumes

This paper discusses the methods and the results used in an accompanying paper describing the matching of effective chiral Lagrangians in dimensional and lattice regularizations. We present methods to compute 2-loop massless sunset diagrams in finite asymmetric volumes in the framework of these regularizations. We also consider 1-loop sums in both regularizations, extending the...

Matching effective chiral Lagrangians with dimensional and lattice regularizations

theories, Nucl. Phys. B 359 (1991) 221 [INSPIRE]. [9] F. Niedermayer and P. Weisz, Massless sunset diagrams in finite asymmetric volumes, arXiv:1602.03159 [INSPIRE]. [10] M. Weingart, The QCD rotator with a

On-shell improved lattice gauge theories

Commun. Math. Phys. On-Shell Improved Lattice Gauge Theories M. Lfischer P. Weisz Communicated by G. Mack The coefficient of a 2 ~2Tr(D; F; ~DuF~; v)in Eq; (62) should be - These alterations