Search for K+ decays into the π+e+e−e+e− final state

Collaboration

Jul 10, 2023

9 pages

Published in:

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DOI:

PDG:

{{\mathit K}^{+}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit e}^{+}}{{\mathit e}^{-}}

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Abstract: (Elsevier B.V.)

The first search for ultra-rare

K^{+}

decays into the

π^{+} e^{+} e^{-} e^{+} e^{-}

final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of

1.4 \times 10^{- 8}

at 90% CL is obtained for the branching ratio of the

K^{+} \to π^{+} e^{+} e^{-} e^{+} e^{-}

decay, predicted in the Standard Model to be

(7.2 \pm 0.7) \times 10^{- 11}

. Upper limits at 90% CL are obtained at the level of

10^{- 9}

for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators:

K^{+} \to π^{+} a a

,

a \to e^{+} e^{-}

and

K^{+} \to π^{+} S

,

S \to A^{'} A^{'}

,

A^{'} \to e^{+} e^{-}

.

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