OVERVIEW OF PION-NUCLEUS INTERACTION AT LOW ENERGIES
نویسندگان
چکیده
منابع مشابه
Effect of Pion-Pion Scattering Resonance on Nucleon Structure and Pion-Nucleon Scattering at Low Energies
The effect of pion-pion scattering resonance on the isovector part of nucleon structure is analysed by a method similar to that of Frazer and Fulco, but with one more subtraction for dispersion relations on helicity amplitudes of nucleon·aritinucleon production process in order to remedy the divergence regarding the left-hand cut. If the subtracted spectral representations are used for the form...
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The electromagnetic corrections to the low energy scattering amplitude involving charged pions only are investigated at leading and next-to-leading orders in the twoflavour chiral expansion. As an application, the corresponding variation in the strong 2S − 2P level shift is evaluated. The relative variation is of the order of 5%.
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It has been argued that a strangeness enhancement in heavy ion collisions might be an indirect signal for the quark-gluon plasma [1]. This enhancement should be most easily seen in the most abundant strange particles, the kaons. Experiments at the AGS and SPS indeed found a maximum in the K/π at about 30 GeV [2]. In [3] the authors presented an excitation function of the K/π ratio at these ener...
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We present technical details of the evaluation of the elastic ππ scattering amplitude to two loops in chiral perturbation theory. In particular, we elaborate on the renormalization procedure at the two–loop order and on the evaluation of the relevant Feynman diagrams that can all be expressed in terms of elementary functions. For the sake of clarity, we discuss these matters both in the N–compo...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics A
سال: 2007
ISSN: 0217-751X,1793-656X
DOI: 10.1142/s0217751x07035355