ar X iv : h ep - p h / 96 02 42 1 v 1 2 8 Fe b 19 96 BUTP – 96 / 01 Charged Pion Polarizabilities to two Loops 1
نویسنده
چکیده
We evaluate the electric and magnetic polarizabilities of charged pions in the framework of chiral perturbation theory at next–to–leading order. This requires a two– loop evaluation of the Compton amplitude near threshold. We estimate the two new low–energy constants which enter the chiral expansion at this order with resonance saturation. The numerical results are compared with presently available experimental information.
منابع مشابه
ar X iv : h ep - p h / 96 02 40 1 v 1 2 6 Fe b 19 96 UG - FT - 57 / 96 hep - ph / 9602401 February 1996 CHIRAL PERTURBATION THEORY
An introduction to the methods and ideas of Chiral Perturbation Theory is presented in this talk. The discussion is illustrated with some phenomenological predictions that can be compared with available experimental results.
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We calculate the one-quark-loop amplitude for the low energy γγ → ππ collision in the context of the Nambu and Jona-Lasinio model with scalar and pseudoscalar four quark couplings to all orders in the external momenta. We show that the NJL predictions for the γγ → π + π − reaction are not far from the Born amplitude, which is close to the data, and is compatible with the chiral perturbation the...
متن کاملar X iv : h ep - p h / 96 02 31 9 v 1 1 5 Fe b 19
It is shown that the parity–violating deep–inelastic scatterings of unpolarized charged leptons on polarized protons, ℓ ∓ + P → (−) ν ℓ +X, could provide a sensitive test for the behavior and magnitude of the polarized strange–quark density in a proton. Below charm threshold these processes are also helpful to uniquely determine the magnitude of individual polarized parton distributions.
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تاریخ انتشار 2008