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We report a sensitive study of measuring $b\to s\gamma$ photon polarisationin $D^{0}\to K_1(1270)^-e^+\nu_e$ with an integrated luminosity of $\mathcal L$= 1 ab$^{-1}$ at a center-of-mass energy of 3.773 GeV at future Super Tau CharmFacility. More than 61,000 signals of $D^{0}\to K_1(1270)^-e^+\nu_e$ areexpected. Based on a fast simulation software package, the statisticalsensitivity for the ratio of up-down asymmetry is estimated to be $1.5\times10^{-2}$ by performing a two-dimensional angular analysis in $D^{0}\toK_1(1270)^-e^+\nu_e$. Combining with measurements of up-down asymmetry in $B\toK_1\gamma$, the photon polarisation in $b\to s\gamma$ can be determinedmodel-independently.

Feasibility study of measuring $b\to s\gamma$ photon polarisation in $D^0\rightarrow K_1(1270)^- e^+\nu_e$ at STCF