Projects per year
Abstract
A detailed study of Higgs interference effects at the oneloop level in the 1HiggsSinglet extension of the Standard Model (1HSM) is presented for the WW and tt decay modes with fully leptonic WW decay. We explore interference effects for benchmark points with a heavy Higgs mass that significantly exceeds 2*m_t. In the WW channel, the Higgs signal and the interfering continuum background are loop induced. In the tt channel, which features a treelevel background, we also calculate the interference with the oneloop background, which, due to the appearance of the absorptive part, is found to dominate the normalisation and shape of differential Higgs cross section distributions and should therefore be considered in experimental analyses. The commonly used geometric average Kfactor approximation K_interference ~ (K_Higgs*K_background)^(1/2) 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 partonlevel integrator or event generator.
Original language  English 

Article number  108 
Pages (fromto)  143 
Number of pages  43 
Journal  Journal of High Energy Physics 
Volume  2019 
Early online date  18 Jul 2019 
DOIs  
Publication status  Published  Jul 2019 
Projects
 1 Finished

SouthEastern Particle Theory Alliance Sussex – RHUL – UCL 20172020, RHUL Node
Kauer, N. (PI) & Lind, A. (Student)
Science and Technology Facilities Council
1/10/17 → 30/09/21
Project: Other
Activities
 1 Invited talk

Beyond the benchmarks: offshell Higgs production
Kauer, N. (Invited speaker)
2 Dec 2019Activity: Talk or presentation › Invited talk