作者: H. Leutwyler,
期刊: AIP Conference Proceedings (AIP Available online 1903) 卷期: Volume 670, issue 1
页码: 45-52
ISSN:0094-243X
年代: 1903
DOI:10.1063/1.1594317
出版商: AIP
数据来源: AIP
摘要:
I draw attention to a recent breakthrough in the field of low energy pion physics: the consequences of the hidden symmetry of the QCD Hamiltonian have successfully been incorporated in the general dispersive framework for the &pgr;&pgr; scattering amplitude, which is due to Roy. The meagre experimental information about the imaginary parts at and above 0.8 GeV suffices to unambiguously and accurately pin down the scattering amplitude at lower energies. The recent Brookhaven data on the reactionK→ &pgr;&pgr;evprovide a significant test of the theory. They imply that the Gell‐Mann‐Oakes‐Renner relation is approximately valid — the bulk of the pion mass indeed originates in the quark condensate. © 2003 American Institute of Physics
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