9th General Meeting of the LHC EFT Working Group

Session

Tools & amplitudes

2 Dec 2025, 14:30

4/3-006 - TH Conference Room (CERN)

Conveners

Tools & amplitudes

• Peter Stangl (Johannes Gutenberg University Mainz)

13. (Remote) Sherpa implementation of h decaying to b b at NLO (QCD+EW)

Shakeel Ur Rahaman

02/12/2025, 14:30

In the SMEFT framework, we calculated QCD and EW corrections at NLO to the Higgs decay to a $b \bar b $ pair. To accurately simulate this process for the LHC, we implemented the matrix element into Sherpa. This allows us to study how the parton shower affects those hard matrix elements.

9. Multi-Higgs Amplitudes Bootstrapped: Dissecting SMEFT and HEFT

Alejo Nahuel Rossia (University of Padua and INFN Sezione di Padova), Michal Jakub Ryczkowski (Università di Padova and INFN, Sezione di Padova)

02/12/2025, 14:55

The precise measurement of the Higgs boson properties requires a robust framework to parametrize possible deviations from Standard Model (SM) predictions in the most model-independent way possible. The Effective Field Theory (EFT) framework has become the most widely used since it offers a broad scope and a consistent path to increase the precision of the computations. Two prominent EFTs are...

15. Automated operator basis changes for general Effective Field Theories

Sudeepan Datta (Paul Scherrer Institute (CH))

02/12/2025, 15:20

In this talk, we shall discuss the automation of operator basis changes for effective field theories with arbitrary gauge symmetries and matter content. In particular, we shall describe the workflow, where we start with performing basis changes at the tree level using IBP, completeness relations, and Fierz identities, with the eventual aim of performing completely general basis changes at the...