Solar Kaluza-Klein axion search with NEWS-G
Q. Arnaud (IP2I, Université Lyon 1, CNRS/IN2P3, IP2I-Lyon, F-69622 Villeurbanne, France); L. Balogh (Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada); C. Beaufort (LPSC, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble 38026, France); A. Brossard (Department of Physics, Engineering Physics and Astronomy, Queen’s University, Kingston, Ontario K7L 3N6, Canada); J.F. Caron (Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada); et al - Show all 41 authors
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 is set on the axion-photon coupling for the benchmark of a Kaluza-Klein axion density on Earth of and two extra dimensions of size .