The NA62 experiment

Birmingham group: M B Brunetti, Dr F Gonnella, Dr E Goudzovski, L Iacobuzio, Prof C Lazzeroni, Dr N Lurkin, Dr D Munday, Dr C Parkinson, Dr A Romano, Dr A Sergi, R Staley, A Sturgess, J Swallow

NA62 is a precision experiment at CERN dedicated to study of rare and forbidden decays of the charged kaon. It uses high intensity 75 GeV/c secondary hadron beam provided by the CERN SPS accelerator, and is located in the ECN3 hall in the North Area of CERN. According to its design, it will be exposed to over 1013 K+ decays in its fiducial decay region during the data taking in 2015–2018. This will allow stringent tests of the Standard Model and precision searches for new physics beyond the Standard Model description. The pilot run took place in October–December 2014, and physics data taking started in June 2015.

The primary goal of the experiment is the measurement of the ultra-rare decay K+→π+νν, with the expected SM branching ratio below 10−10. The SM contribution to the decay rate comes from penguin and box diagrams. Its dominant part is due to top quark exchange, which leads to the highest CKM suppression. The SM decay rate has been computed with 10% relative precision. This decay is an ideal place to search for new physics: the low and precisely predicted branching ratio of this decay mode means that any new physics signal will give a sizable deviation that will be detectable by the NA62 experiment.

The wider NA62 physics programme includes precision searches for lepton flavour and number violation, searches for heavy neutral leptons and the dark photon, lepton universality tests, and studies of rare decays of kaons and pions.

For general information about NA62, see:
The Birmingham group is one of the largest in the collaboration, and is involved in:
  • construction and operation of the CEDAR/KTAG Cherenkov detector;
  • development and operation of the L0 muon trigger system;
  • development and support of the run control system;
  • development and support of the core software;
  • measurements of lepton flavour and lepton number violating kaon decays;
  • lepton universality tests in leptonic kaon decays;
  • rare kaon and pion decay measurements.

We also play a leading role in the analyses of the existing data sets collected by earlier kaon experiments at CERN (NA48/2 and NA62-RK).

NA62 detector construction (2012)

The KTAG subdetector built by the UK groups

Final stage of NA62 construction (2014)