Speaker
Description
The talk consists of two parts:
(i) The recent excess in a rare decay of the Higgs boson $H\to Z \gamma$ can be interpreted using a light axion-like particle (ALP) in the mass range of $0.05 - 0.1$ GeV. The dominant decay of such a light ALP is into a pair of collimated photons, whose decay is required to happen before reaching the ECAL detector, such that it mimics a single photon in the detector.
(ii) The sensitivities on the gauge-boson couplings $g_{aZZ}, g_{aZ\gamma}$ and $g_{aWW}$ of an axion-like particle (ALP) are estimated at the LHC with $\sqrt{s}=14$ TeV and integrated luminosities of 300 fb (current run) and 3000 fb (High-Luminosity LHC). We focus on the associated production processes of $pp\to Za \to (\ell^+ \ell^-) (\gamma\gamma)$ and $pp\to W^\pm a \to (\ell^\pm \nu) (\gamma\gamma)$.
