A search for the ℤγ decay mode of the Higgs boson in pp collisions at \sqrts = 13 TeV with the ATLAS detector

Franconi, Laura; Haug, Sigve; Weber, Michele; Anders, John Kenneth; Fehr, Armin; Beck, Hans Peter; Ereditato, Antonio (2020). A search for the ℤγ decay mode of the Higgs boson in pp collisions at \sqrts = 13 TeV with the ATLAS detector. Physics letters. B, 809(135754), p. 135754. Elsevier 10.1016/j.physletb.2020.135754

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A search for the Zγ decay of the Higgs boson, with Z boson decays into pairs of electrons or muons is presented. The analysis uses proton–proton collision data at = 13 TeV corresponding to an integrated luminosity of 139 fb−1 recorded by the ATLAS detector at the Large Hadron Collider. The observed data are consistent with the expected background with a p-value of 1.3%. An upper limit at 95% confidence level on the production cross-section times the branching ratio for is set at 3.6 times the Standard Model prediction while 2.6 times is expected in the presence of the Standard Model Higgs boson. The best-fit value for the signal yield normalised to the Standard Model prediction is where the statistical component of the uncertainty is dominant.

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