Abstract
TheK 0S →π0 l + l − andK 0L →π 0 l + l − decays are considered within the framework of the Standard model in the one-photon exchange approximation, i.e.K 0S,L →π0+γ *→π0 +l + l −. To evaluate the low-energy matrix elements of theK 0(¯K 0)→π0+γ * transitions, the constituentquark-loop approximation, based on the extended Nambu-Jona-Lasino (NJL) model, is used. The obtained results are compared with other theoretical estimates and the experimental bounds.
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Ivanov, A.N., Nagy, M. & Troitskaya, N.I. TheK 0S →π0 l + l − andK 0L →π0 l + l − decays in the standard model and the extended Nambu-Jona-Lasinio model. Czech J Phys 41, 1–11 (1991). https://doi.org/10.1007/BF01606392
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DOI: https://doi.org/10.1007/BF01606392