Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Search for New Particles I

T 12.6: Talk

Monday, March 15, 2021, 17:20–17:35, Tl

Deriving limits on ALPs coupling to the SM Higgs boson in multiphoton events recorded at the LHC with ATLAS — Bernard Brickwedde, •Peter Krämer, Marten Mildeberger, Kristof Schmieden, Matthias Schott, and Olivera Vujinovic — Johannes Gutenberg Universität Mainz

Some puzzling questions in particle physics, such as the strong CP problem or the discrepancy of the muons magnetic moment could be solved by introducing light scalar or pseudo-scalar axion like particles (ALPs). Theoretic models allow a wide range of ALP-masses and couplings to SM particles such as the photon and the Higgs boson. Therefore, parts of the ALPs parameter space could be investigated with collider experiments like the ATLAS experiment at the LHC.

In the present analysis we search for SM Higgs bosons decaying to a pair of ALPs further decaying to two photons each.

In this talk, it will be discussed how limits on the ALP parameters can be derived after selecting events with two, three or four photons in the final state.