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Direct experimental limit on neutron-mirror-neutron oscillations

Abstract : In case a mirror world with a copy of our ordinary particle spectrum would exist, the neutron n and its degenerate partner, the mirror neutron ${\rm n'}$, could potentially mix and undergo ${\rm nn'}$ oscillations. The interaction of an ordinary magnetic field with the ordinary neutron would lift the degeneracy between the mirror partners, diminish the ${\rm n'}$-amplitude in the n-wavefunction and, thus, suppress its observability. We report an experimental comparison of ultracold neutron storage in a trap with and without superimposed magnetic field. No influence of the magnetic field is found and a limit on the oscillation time $\tau_{\rm nn'} > 103$ s (95% C.L.) is derived.
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Submitted on : Wednesday, January 13, 2010 - 11:08:33 AM
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G. Ban, T. Lefort, O. Naviliat-Cuncic, K. Bodek, S. Kistryn, et al.. Direct experimental limit on neutron-mirror-neutron oscillations. Physical Review Letters, American Physical Society, 2007, 99, pp.161603. ⟨10.1103/PhysRevLett.99.161603⟩. ⟨in2p3-00164661⟩

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