SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 101: Invited Topical Talks III-A

T 101.2: Eingeladener Vortrag

Donnerstag, 23. März 2023, 14:20–14:40, HSZ/0003

Measuring H→ WW with the ATLAS Experiment — •Carsten Burgard for the ATLAS collaboration — TU Dortmund

The past year saw the 10th anniversary of the discovery of the Higgs boson - an excellent time to reflect on past achievements and look into the future. The decay of the Higgs boson to a pair of W bosons is one of the most sensitive channels to measure the total Higgs boson production rate, mostly due to the relatively large rate of leptonic W decays. This leptonic signature comes with some unique challenges and opportunities: it exposes a high rate of gluon-fusion produced Higgs bosons on top of the backgrounds, providing an opportunity for a powerful differential measurement, while the rarer VBF and VH decays allow direct experimental access to the coupling of the Higgs to vector bosons. Also for possible high-mass particles decaying to a pair of W bosons, this channel is a sensitive probe. While the reconstruction of the properties of the Higgs boson itself can be challenging due to the evanescent neutrinos, precise measurements are still enabled by the sheer statistical power of the channel. Finally, even the neutrinos can be exploited: the parity-violation-induced spin-entanglement of the leptons does not only provide a distinctive feature to reject continuum WW background, but could also allow to measure violation of Bell inequalities in Higgs physics in the future. Run 2 of the LHC has provided the ATLAS experiment with a powerful dataset to tackle these measurements, and the ongoing Run 3 will only add to this.