Testing the Unitarity of the CKM Matrix with a Space-Based Neutron Decay Experiment

Details Testing the Unitarity of the CKM Matrix with a Space-Based Neutron Decay Experiment Testing the Unitarity of the CKM Matrix with a Space-Based Neutron Decay Experiment

2006-05-20

arxiv.org/abs/hep-ph/0605218v2

Mod.Phys.Lett.A23:1735-1743,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 figures. Revised and updated for publication

Scientific paper

10.1142/S0217732308027187

If the Standard Model is correct, and fundamental fermions exist only in the three generations, then the CKM matrix should be unitary. However, there remains a question over a deviation from unitarity from the value of the neutron lifetime. We discuss a simple space-based experiment that, at an orbit height of 500 km above Earth, would measure the kinetic-energy, solid-angle, flux spectrum of gravitationally bound neutrons (kinetic energy K<0.606 eV at this altitude). The difference between the energy spectrum of neutrons that come up from the Earth's atmosphere and that of the undecayed neutrons that return back down to the Earth would yield a measurement of the neutron lifetime. This measurement would be free of the systematics of laboratory experiments. A package of mass $<25$ kg could provide a 10^{-3} precision in two years.

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