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Cohen, Andrew G.; Ecker, Gerhard; Pich Zardoya, Antonio | |||
Aquest document és un/a article, creat/da en: 1993 | |||
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We discuss the rare decay K(L) --> pi0gammagamma. Although the recently measured 2gamma-invariant-mass distribution is in quite good agreement with the lowest-order chiral perturbation theory prediction, there seems to be a discrepancy with the calculated branching ratio. We extend the previous computations to next-to-leading order, O(p6). The two dominant mechanisms at this order are emphasized: the two-pion intermediate state and vector meson exchange. | |||
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