Speaker
Description
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.
Details
Prof. Paolo Massarotti
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | NA62 Experiment at CERN, https://na62.web.cern.ch/ |
| Is the speaker for that presentation defined? | Yes |
| Internet talk | No |
