# ${{\boldsymbol A}^{0}}$ (Axion) Search in Photoproduction INSPIRE search

VALUE DOCUMENT ID  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
1
 1995
${\mathit m}_{{{\mathit A}^{0}}}$ = $1.8$ $\pm0.2$ MeV
1  BASSOMPIERRE 1995 is an extension of BASSOMPIERRE 1993 . They looked for a peak in the invariant mass of ${{\mathit e}^{+}}{{\mathit e}^{-}}$ pairs in the region ${\mathit m}_{\mathrm { {{\mathit e}^{+}} {{\mathit e}^{-}} }}$ = $1.8$ $\pm0.2$ MeV. They obtained bounds on the production rate ${{\mathit A}^{0}}$ for $\tau ({{\mathit A}^{0}}$) = $10^{-18} - 10^{-9}~$sec. They also found an excess of events in the range ${\mathit m}_{\mathrm { {{\mathit e}^{+}} {{\mathit e}^{-}} }}$ = $2.1 - 3.5$ MeV.
References:
 BASSOMPIERRE 1995
PL B355 584 Search for Light Neutral Objects Photoproduced in a Crystal Field and Decaying into ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Pairs