Removing pions from two-nucleon effective field theory
نویسندگان
چکیده
منابع مشابه
Removing Pions from Two-Nucleon Effective Field Theory
Two-nucleon effective field theory (EFT) beyond momenta of order the pion mass is studied for both cutoff regularization and dimensional regularization with power divergence subtraction (PDS). Models with two mass scales illustrate how effects of long-distance pion physics must be removed from the coefficients that encode short-distance physics. The modified effective range expansion shows that...
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Nuclear processes involving momenta much below the mass of the pion may be described by an effective field theory in which the pions do not appear as explicit degrees of freedom. The effects of the pion and all other virtual hadrons are reproduced by the coefficients of gauge-invariant local operators involving the nucleon field. Nucleon-nucleon scattering phase shift data constrains many of th...
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For interactions involving two or more nucleons it is useful to divide pions into three classes: potential, radiation, and soft. The momentum threshold for the production of radiation pions is Qr = √ MNmπ. We show that radiation pions can be included systematically with a power counting inQr. The leading order radiation pion graphs which contribute to NN scattering are evaluated in the PDS and ...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 1999
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(98)00619-8