Search for high energy 5.5 MeV solar axions with the complete Borexino dataset

Abstract

A search for solar axions and axion-like particles produced in the $p+d\to {}^3\mathrm{He}+\mathrm{A}(5.5\mathrm{MeV})$ reaction was performed using the complete dataset of the Borexino detector (3995 days of measurement live-time). The following interaction processes have been considered: axion decay into two photons $(\mathrm{A}\to 2\gamma )$, inverse Primakoff conversion on nuclei $(\mathrm{A}+Z\to \gamma +Z$), the Compton conversion of axions to photons $(\mathrm{A}+e\to e+\gamma )$ and the axio-electric effect $(\mathrm{A}+e+Z\to e+Z$). Model-independent limits on axion-photon ($g_{A\gamma }$), axion-electron ($g_{Ae}$), and isovector axion-nucleon ($g_{3AN}$) couplings are obtained: $|g_{A\gamma }\times g_{3AN}|\le 2.3\times 10^{-11}{\mathrm{GeV}}^{-1}$ and $|g_{Ae}\times g_{3AN}|\le 1.9\times 10^{-13}$ at $m_A<$ 1 MeV (90\% c.l.). The Borexino results exclude new large regions of $g_{A\gamma }$, and $g_{Ae}$ coupling constants and axion masses $m_A$, and leads to constraints on the products $|g_{A\gamma }\times m_A|$ and $|g_{Ae}\times m_A|$ for the KSVZ- and the DFSZ-axion models.

arXiv comment13 pages, 8 figures

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