Sep 5 – 10, 2021
Europe/Lisbon timezone

Search for K+ decays to a lepton and invisible particles at NA62 (12+3)

Sep 8, 2021, 3:55 PM


Talk Flavour physics - CKM and beyond Flavour physics - CKM and beyond


Simone Schuchmann (Johannes Gutenberg University Mainz)


The NA62 experiment at CERN reports searches for K+ → e+N, K+→μ+N and K+→μ+νX decays, where N and X are massive invisible particles, using the 2016-2018 data set.
The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−9) and O(10−8) of the neutrino mixing parameter |Ue4|2 and |Uμ4|2, improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range.
The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10-370 MeV/c2 are reported for the first time, ranging from O(10−5) to O(10−7).
An improved upper limit of 1.0×10−6 is established at 90% CL on the K+→μ+ννν¯ branching fraction.

Primary author

Simone Schuchmann (Johannes Gutenberg University Mainz)

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