The decays K → ππνν̄ within the standard model

L. S. Littenberg, G. Valencia

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We study the reactions K → ππνν̄ within the minimal standard model. We use isospin symmetry to relate the matrix elements to the form factors measured in Kℓ4. We argue that these modes are short distance dominated and can be used for precise determinations of the CKM parameters ρ and η. Depending on the value of the CKM angles we find branching ratios in the following ranges: B(KL → π+π-νν̄) = [2-5] × 10-13; B(KL → π0π0νν̄) = [1-3] × 10-13; B(K+ → π+π0νν̄) = [1-2] × 10-14. We also discuss a possible CP-odd observable.

Original languageEnglish
Pages (from-to)379-384
Number of pages6
JournalPhysics Letters B
Issue number1-4
Publication statusPublished - 26 Sep 1996
Externally publishedYes

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