Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 13: Higgs Physics II

T 13.4: Vortrag

Montag, 16. März 2026, 17:00–17:15, KH 02.013

Interference effects of Beyond Standard Model Higgs to ditau production on Z pole — •Frank Nowak, Luka Vomberg, Philip Bechtle, Christian Grefe, and Klaus Desch — Universität Bonn

The Higgs sector is still one of the most interesting areas of the Standard Model (SM), even more than 13 years after the discovery of the Higgs boson. There is a wide variety of motivation for expanded Higgs sectors in beyond-the-SM theories (BSM), both from theoretical considerations and from experimental hints. A particularily attractive addition would involve an additional light Higgs-boson below the mass of the SM-like Higgs boson at 125 GeV. It would be even more theoretically attractive to consider CP even H, CP odd A and mixed CP states φ for this particle.

For this study the search for these BSM Higgs bosons in the decay of H/A→ττ covers the particularly challenging mass range around the Z peak. In this case, interference of the BSM Higgs boson production with Z boson production cannot be excluded for some contributions to the production. The possible interference effects of new particles are explored in truth level Monte Carlo samples in the pp→ττ + X channel. A special emphasis of this study is the influence of the CP-state of the new bosons on the interference between the BSM Higgs and Z.

Keywords: Beyond Standard Model; Higgs; ATLAS