Neutron lifetime puzzle and neutron–mirror neutron oscillation
Dipartimento di Fisica e Chimica, Università di L’Aquila, 67100, Coppito, L’Aquila, Italy
2 INFN, Laboratori Nazionali del Gran Sasso, 67010, Assergi, L’Aquila, Italy
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Accepted: 22 May 2019
Published online: 10 June 2019
Standard Model, with its present precision, predicts the neutron -decay time s which is perfectly compatible with the neutron lifetime measured in the trap experiments s. However, the lifetime measured in the beam experiments via counting the protons produced by -decay , s, is deviated from by 9 seconds (). This discrepancy can be explained via the neutron n conversion into mirror neutron , its dark partner from parallel mirror sector. Provided that n and have a tiny mass splitting eV, in magnetic fields of few Tesla used in beam experiments, transition is resonantly enhanced converting a 1 fraction of neutrons into mirror neutrons which decay in invisible mode . Thus less protons are produced and the measured value appears larger than the true decay time .
© The Author(s), 2019