Speaker
Description
The matter-antimatter asymmetry of the universe may result at least partially from CP violation. CP violation in mesons and neutrinos is too small to account for matter-antimatter asymmetry, motivating a search for CP violation in the Higgs sector. We present a study of the potential measurement of CP symmetry of the Higgs boson at the International Linear Collider (ILC) by the SiD experiment. We study the H --> tau+,tau- channel, which is particularly useful for CP analysis of leptonic Higgs decays because of its high branching ratio and the ease of extracting CP-sensitive statistics from tau decay products. Our method uses a double neural network system which takes energy and multiplicity statistics as inputs to tag tau events and their decay paths. We use CP-sensitivity-based event weighting methods to avoid strict cuts and make use of tau+- --> pi+-, pi+-pi0, l+-, pi+-2pi0, pi-+2pi+- decay modes. We focus on ZH, Z --> e+e-, mu+mu- events for simplicity. Our workflow performs very well against the dominant four-fermion background and yields strong preliminary mixing angle precision estimates. These results could help improve the precision of Higgs CP violation measurements at the ILC.
| Time Zone | Americas |
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