Better Higgs-CP tests through information geometry
Measuring the CP symmetry in the Higgs sector is one of the key tasks of the LHC and a crucial ingredient for precision studies, for example in the language of effective Lagrangians. We systematically analyze which LHC signatures offer dedicated CP measurements in the Higgs-gauge sector and discuss...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
16 May 2018
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| In: |
Physical review
Year: 2018, Volume: 97, Issue: 9 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.97.095017 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1103/PhysRevD.97.095017 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.97.095017 
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| Author Notes: | Johann Brehmer, Felix Kling, Tilman Plehn, and Tim M. P. Tait |
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| 520 | |a Measuring the CP symmetry in the Higgs sector is one of the key tasks of the LHC and a crucial ingredient for precision studies, for example in the language of effective Lagrangians. We systematically analyze which LHC signatures offer dedicated CP measurements in the Higgs-gauge sector and discuss the nature of the information they provide. Based on the Fisher information measure, we compare the maximal reach for CP-violating effects in weak boson fusion, associated ZH production, and Higgs decays into four leptons. We find a subtle balance between more theory-independent approaches and more powerful analysis channels, indicating that rigorous evidence for CP violation in the Higgs-gauge sector will likely require a multistep process. | ||
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