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000281240 005__ 20210129221652.0
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000281240 041__ $$aEnglish
000281240 1001_ $$0P:(DE-Juel1)132580$$aDurr, Stephan$$b0$$eCorresponding author
000281240 1112_ $$a32nd International Symposium on Lattice Field Theory$$cNew York$$d2014-06-23 - 2014-06-28$$gLattice 2014$$wUSA
000281240 245__ $$aValidity of ChPT - is $M_\pi$=135 MeV small enough ?
000281240 260__ $$bProceedings of Science$$c2015
000281240 29510 $$aProceedings of the 32nd International Symposium on Lattice Field Theory (LATTICE 2014)
000281240 300__ $$a14 p.
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000281240 520__ $$aI discuss the practical convergence of the SU(2) ChPT series in the meson sector, based on 2+1 flavor lattice data by the Wuppertal-Budapest and Budapest-Marseille-Wuppertal collaborations. These studies employ staggered and clover-improved Wilson fermions, respectively. In both cases large box volumes and several lattice spacings are used, and the pion masses reach down to the physical mass point. We conclude that LO and NLO low-energy constants can be determined with controlled systematics, if there is sufficient data between the physical mass point and about 350 MeV pion mass. Exploratory LO+NLO+NNLO fits with a wider range reveal some distress of the chiral series near M_\pi ~ 400 MeV and suggest a complete breakdown beyond M_\pi ~ 500 MeV.
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000281240 8564_ $$uhttp://pos.sissa.it/archive/conferences/214/006/LATTICE2014_006.pdf
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