Search for K+ decays to a muon and invisible particles

, The NA62 Collaboration (2021) Search for K+ decays to a muon and invisible particles. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 816.

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Abstract

The NA62 experiment at CERN reports searches for 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(10−8) of the neutrino mixing parameter |Uμ4|2 for N masses in the range 200–384 MeV/c2 and lifetime exceeding 50 ns. 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.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
154402
Deposited By:
Deposited On:
11 May 2021 09:30
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Jun 2021 05:56