Solar Kaluza-Klein axion search with NEWS-G

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Abstract

Kaluza-Klein axions appear in theories with extra dimensions as higher mass, significantly shorter lifetime, excitations of the Peccei-Quinn axion. When produced in the Sun, they would remain gravitationally trapped in the solar system, and their decay to a pair of photons could provide an explanation of the solar corona heating problem. A low-density detector would discriminate such a signal from the background, by identifying the separation of the interaction point of the two photons. The NEWS-G collaboration uses large volume spherical proportional counters, gas-filled metallic spheres with a spherical anode in their centre. After observation of a single axionlike event in a 42 day long run with the SEDINE detector, a 90% C.L. upper limit of ${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}<8.99\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}\text{ }\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$ is set on the axion-photon coupling for the benchmark of a Kaluza-Klein axion density on Earth of ${n}_{a}=4.07\ifmmode\times\else\texttimes\fi{}{10}^{13}\text{ }\text{ }{\mathrm{m}}^{\ensuremath{-}3}$ and two extra dimensions of size $R=1\text{ }\text{ }{\mathrm{eV}}^{\ensuremath{-}1}$.

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