Search for the Higgs boson decays → And → In Collisions at with the ATLAS detector

Searches for the Higgs boson decays $H\to ee$ and $H\to e\mu $ are performed using data corresponding to an integrated luminosity of $139\phantom{\rule{0.25em}{0ex}}{\text{fb}}^{-1}$ collected with the ATLAS detector in pp collisions at $\sqrt{s}=13$ TeV at the LHC. No significant signals are observed, in agreement with the Standard Model expectation. For a Higgs boson mass of 125 GeV, the observed (expected) upper limit at the 95% confidence level on the branching fraction $B\left(H\to ee\right)$ is $3.6×{10}^{-4}$ ($3.5×{10}^{-4}$) and on $B\left(H\to e\mu \right)$ is $6.2×{10}^{-5}$ ($5.9×{10}^{-5}$). These results represent improvements by factors of about five and six on the previous best limits on $B\left(H\to ee\right)$ and $B\left(H\to e\mu \right)$ respectively.