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Seminars
Searching for CP violation in the Higgs sector using the H→ττ decay channel
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Europe/London
R61 CR03 (RAL)
R61 CR03 (RAL)
Description
The question of why the visible universe is made of matter, when we expect matter to have been produced in equal amounts with antimatter before annihilating, is one of the biggest unsolved mysteries in physics. Generating a matter-antimatter asymmetry requires CP violation, yet the CP violation in the standard model falls short of explaining the matter surplus by around ten orders of magnitude.
An exciting possibility is that CP violation occurs in the Higgs sector, which can generate a matter excess during the electroweak phase transition. The most promising avenue to test this is by studying Higgs boson decays into tau leptons, as spin correlations between the taus are sensitive to the CP nature of the Higgs. I will present the latest measurement of this process using the CMS experiment at the LHC. I will also discuss prospects for enhancing these measurements going forward, exploiting the much larger datasets that will be recorded at the High-Luminosity LHC.
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Speaker's biography:
Dr Daniel Winterbottom is a researcher at Imperial College London and a member of the CMS Collaboration since 2016. His research spans Higgs boson precision measurements, searches for new particles, and the reconstruction and identification of tau leptons. He completed his PhD at Imperial College London in 2019 and has remained there as a postdoctoral researcher since.
Within CMS, he convened the Higgs to ditau analysis group from 2019 to 2021, and the Tau Physics Object Group from 2022 to 2024, where he oversaw the deployment of tau reconstruction algorithms and calibrations for the LHC's Run-3 data-taking. He previously convened the LHC Higgs NMSSM working group and currently convenes the LHC Higgs CPV working group. His current research focuses on CP measurements in the ditau final state, aiming to understand the origin of the observed matter-antimatter asymmetry of the universe.