${{\mathit A}^{0}}$ (Axion) Search in Photoproduction

INSPIRE   PDGID:
S029AXG
VALUE DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
1
ADHIKARI
2022C
 GLUX ${\mathit m}_{{{\mathit A}^{0}}}$ = $180 - 480$, $600 - 720$ MeV
2
BASSOMPIERRE
1995
${\mathit m}_{{{\mathit A}^{0}}}$ = $1.8$ $\pm0.2$ MeV
1  ADHIKARI 2022C search for ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ and ${{\mathit A}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ decays, and set limits of $\mathit f_{{{\mathit A}^{0}}}{ {}\lesssim{} }$ $0.5 - 14$ GeV at 90$\%$ CL. See their Fig. 4 for mass-dependent limits.
2  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:
ADHIKARI 2022C
PR D105 052007 Search for photoproduction of axionlike particles at GlueX
BASSOMPIERRE 1995
PL B355 584 Search for Light Neutral Objects Photoproduced in a Crystal Field and Decaying into ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Pairs