Test

\mathcal{L} = -\frac{1}{4} Z(\phi) F_{\mu\nu} F^{\mu\nu} + \frac{1}{2} (\partial \phi)^2 - V(\phi) + \bar{\psi} \bigl( i \slashed{D} - m(\phi) \bigr) \psi + \frac{3}{8} m_S^2 S_\mu S^\mu + g_S S_\mu \bigl( \bar{\psi} \gamma^\mu \gamma^5 \psi \bigr) + J^\mu A_\mu + \mathcal{L}_{\text{interaction/helix}}