Search for \pi^0π 0 decays to invisible particles
(2021) Journal of High Energy Physics (Print) — Vol. 02, n° 02, p. 201 (2021)
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- et. al.
- Abstract
- The NA62 experiment at the CERN SPS reports a study of a sample of 4×109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisibleparticles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a modelindependent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axionlike particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.
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Citations
Cortina Gil, E., Kleimenova, A., Lurkin, N., & et al. (2021). Search for \pi^0π 0 decays to invisible particles. Journal of High Energy Physics (Print), 02(02), 201. https://doi.org/10.1007/JHEP02(2021)201 (Original work published 2021)