HH signal reweighting for EFT interpretations

Thursday 24 Apr 2025, 13:00 → 14:00 Europe/Zurich

Andreas Papaefstathiou (Kennesaw State University, GA, USA), Arantxa Ruiz Martinez (Univ. of Valencia and CSIC (ES)), Fabio Monti (CERN), Ludovic Michel Scyboz (Monash University)

13:00 → 13:30 ATLAS contribution to CERN Yellow Report 5

Speakers: Joergen Sjoelin (Stockholm University (SE)), Luca Cadamuro (IJCLab - CNRS/IN2P3 - Université Paris-Saclay (FR)), Tom Ingebretsen Carlson (Stockholm University (SE))

arXiv:2502.20976

EFTHHreweighting.pdf

Updates in arXiv:2502.20976 with respect to LHCHWG-2022-004:

1. This note: The reweighting now includes 3 variables: mhh, |cos(theta*)|, and ptHH.
LHCHWG-2022-004: Used only one variable (mhh).

2. This note: The reweighting is derived for both SMEFT and HEFT at 13 and 13.6 TeV.
LHCHWG-2022-004: Only covered HEFT at 13 TeV.

3. This note: We recommend using one or more EFT samples as reference samples for applying the reweighting.
LHCHWG-2022-004: Used an SM reference sample.

4. This note: We introduce a new method to combine reference samples via a convex combination based on a distance measure that depends on the Wilson coefficients. Essentially, this means adding two reference samples together where each sample gets a weight which vary depending on the Wilson coefficients. A weighted sum essentially. 
LHCHWG-2022-004: Did not use such a method.

5. This note: We show that mhh-based reweighting struggles to capture ptH, especially in cases of destructive interference between the EFT and SM contributions, while it works well in cases of constructive interference.
LHCHWG-2022-004: Only noted that ptH is sometimes not well captured by mhh-based reweighting.

13:30 → 14:00 CMS contribution to CERN Yellow Report 5

Speakers: Alexandra Carvalho Antunes De Oliveira (Peking University (CN)), Matheus Pereira Coelho (Centro de Ciências Naturais e Humanas, Universidade Federal do ABC - UFABC), Pedro Galli Mercadante (UNESP - Universidade Estadual Paulista (BR)), Torben Lange (National Institute of Chemical Physics and Biophysics (EE))

Improvements_on_the_Reweighting_Formula_.pdf

Taskforce report ideas