Jul 15 – 19, 2019
US/Eastern timezone

Higgs interference effect at the one-loop level in the 1-Higgs-Singlet extension of the Standard Model

Jul 16, 2019, 3:40 PM
20m
2213 A Chair : Alessandro Vicini

2213 A Chair : Alessandro Vicini

Higgs/EW/BSM Higgs/EW/BSM

Speaker

Dr WEIMIN SONG (Rutherford Appleton Laboratory)

Description

A detailed study of Higgs interference e?ffects at the one-loop level in the 1-Higgs-Singlet extension of the Standard Model (1HSM) is presented for the WW and t?t decay modes with fully leptonic WW decay. We explore interference effects for benchmark points with a heavy Higgs mass that significantly exceeds 2mt. In the WW channel, the Higgs signal and the interfering continuum background are loop induced. In the t?t channel, which features a tree-level background, we also calculate the interference with the one-loop background, which, due to the appearance of the absorptive part, is found to dominate the normalization and shape of di?fferential Higgs distributions and should therefore be considered in experimental analyses. The commonly used geometric average K-factor approximation is not appropriate. We calculate with massive top and bottom quarks. Our 1HSM and SM implementation in Sherpa+OpenLoops is publicly available and can be used as parton-level integrator or event generator.

Primary author

Dr WEIMIN SONG (Rutherford Appleton Laboratory)

Presentation materials