Solar Kaluza-Klein axion search with NEWS-G

Q. Arnaud (1) , L. Balogh , C. Beaufort (2) , A. Brossard , J.-F. Caron , M. Chapellier , J.-M. Coquillat , E.C. Corcoran , S. Crawford , A. Dastgheibi-Fard (2) , Y. Deng , K. Dering , D. Durnford , C. Garrah , G. Gerbier , I. Giomataris (3) , G. Giroux , P. Gorel , M. Gros (3) , P. Gros , O. Guillaudin (2) , E.W. Hoppe , I. Katsioulas , F. Kelly , P. Knights , S. Langrock , P. Lautridou (4) , R.D. Martin , J.-P. Mols (3) , J.-F. Muraz (2) , T. Neep , K. Nikolopoulos , P. O'Brien , M.-C. Piro , D. Santos (2) , G. Savvidis , I. Savvidis , F.A. Vazquez de Sola Fernandez (4) , M. Vidal , R. Ward , M. Zampaolo (2)

1 IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 SUBATECH - Laboratoire de physique subatomique et des technologies associées

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 $g_{a\gamma \gamma }<8.99\times {10}^{-13}{\mathrm{GeV}}^{-1}$ is set on the axion-photon coupling for the benchmark of a Kaluza-Klein axion density on Earth of $n_a=4.07\times {10}^{13}{\mathrm{m}}^{-3}$ and two extra dimensions of size $R=1{\mathrm{eV}}^{-1}$.

Mots clés: Axion; Kaluza-Klein; Solar Corona; Quiet Sun X-rays; Gaseous detector; Direct detection; Astroparticle physics; axion: Kaluza-Klein; vertex: primary; axion: density; space-time: higher-dimensional; axion: solar; axion: radiative decay; photon: pair production; coupling: (axion 2photon); gravitation; two-photon; excited state; solar system; background; sphere; lifetime; Peccei-Quinn; coupling constant: upper limit; experimental results

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Instrumentations et Détecteurs [physics.ins-det]; Astrophysique [astro-ph]

Q. Arnaud, L. Balogh, C. Beaufort, A. Brossard, J.-F. Caron, et al.. Solar Kaluza-Klein axion search with NEWS-G. Physical Review D, 2022, 105 (1), pp.012002. ⟨10.1103/PhysRevD.105.012002⟩. ⟨hal-03354039⟩