Prospects for detecting axionlike particles via the decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>a</mml:mi><mml:mi>f</mml:mi><mml:mover accent="true"><mml:mi>f</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:math> at future <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math> factories
C. X. Yue, Shuo Yang, Han Wang, Nan Zhang
Abstract
We investigate the prospects for detecting axionlike particles (dubbed as ``a'') via the decay $Z\ensuremath{\rightarrow}af\overline{f}$ at future $Z$ factories. Considering the decay channels $a\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and $a\ensuremath{\rightarrow}b\overline{b}$, four types of signals ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}\overline{)E}$, $bb\overline{)E}$, ${e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, and ${e}^{+}{e}^{\ensuremath{-}}bb$ are explored. We demonstrate that these channels are promising for detecting axionlike particles at $Z$ factories and obtain the sensitivity bounds on the couplings ${g}_{aZZ}$ and ${g}_{a\ensuremath{\gamma}Z}$.