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epsilon'/epsilon and Chiral Dynamics

AuthorsPich, Antonio
Issue DateJun-2001
PublisherEuropean Organization for Nuclear Research
Citation5th International Symposium on Radiative Correction (2000)
AbstractThe long-distance contributions to $K\to 2\pi$ amplitudes can be pinned down, using well established Chiral Perturbation Theory techniques. The strong S--wave rescattering of the two final pions generates sizeable chiral loop corrections, which have an important impact on the direct CP violation ratio epsilon'/epsilon. Including all large logarithmic corrections, both at short and long distances, the Standard Model Prediction for this observable is found to be Re(epsilon'/epsilon) = (1.7\pm 0.9) 10^{-3}, in good agreement with the most recent experimental measurements. A better estimate of the strange quark mass could reduce the theoretical uncertainty to 30%.
Description13 páginas, 1 figura.-- Comunicación presentada al 5º International Symposium on Radiative Corrections (RADCOR{2000) celebrado del 11 al 15 de Septiembre de 2000 en Carmel CA (USA).
Publisher version (URL)http://cdsweb.cern.ch/search?sysno=002258611CER
Appears in Collections:(IFIC) Comunicaciones congresos
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