1st COMETA General Meeting

Session

Short Talks Session

29 Feb 2024, 18:00

Education Hall (İzmir, Türkiye)

Conveners

Short Talks Session

• Richard Ruiz (Fermi National Accelerator Lab. (US))
• Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)

5. NLO EW corrections to polarised W+ W− production and decay at the LHC

Christoph Haitz

29/02/2024, 18:00

With the help of the pole approximation, observables with polarised intermediate resonances can be calculated. Gauge-boson-pair production represents a particularly interesting class of processes to study polarisation. So far the computation of the NLO EW corrections was only possible for uncharged polarised resonances, since processes with charged resonances have additional infrared...

7. Polarised cross sections for vector boson production with SHERPA

Diana Mareen Hoppe (Technische Universitaet Dresden (DE))

29/02/2024, 18:12

Measurements of vector boson (VB) polarisation in VB production processes offer a powerful probe of the electroweak symmetry breaking mechanism, scrutinising the Standard Model and new physics scenarios alike. Since massive VBs can only be observed as intermediate particles, polarised cross section templates from simulation are necessary to extract their polarisation from measurable...

2. Triboson production in the SMEFT

Eugenia Celada

29/02/2024, 18:24

The processes of triboson production in high-energy proton–proton collisions provide a unique mean to probe the quartic interactions between EW gauge bosons and to perform indirect searches for physics beyond the Standard Model. Despite their small cross-sections, the production of 𝑉𝛾𝛾, 𝑉𝑉𝛾, 𝑉𝑉𝑉 (𝑉 = 𝑊 or 𝑍) at centre-of-mass energy of 13 TeV at the LHC has recently been observed by the ATLAS...

8. A parton-level study on dimension-6 EFT operators in electroweak boson scattering processes at the LHC

Giorgio Pizzati (Universita & INFN, Milano-Bicocca (IT))

29/02/2024, 18:36

A sensitivity study to new physics parametrized in the context of dimension-6 CP-even operators of the Standard Model Effective Field Theory (SMEFT) is obtained by combining several analyses performed at the parton-level. These include the production of opposite charged W bosos (W±W∓) and various flavours of VBS signatures (W±W±,W±W∓, ZZ, WZ) in leptonic or semi-leptonic final states. The...

9. CMS Vector Boson Scattering SM combination and EFT at dimension-6 in the l\nu qq decay channel

Mr Giacomo Boldrini (Universita & INFN, Milano-Bicocca (IT))

29/02/2024, 18:48

Effective Field Theory (EFT) interpretations of the LHC data are gaining popularity as they allow to decouple analyses from a specific UV-complete model. All the leading dimension-six terms can be constrained only by combining inputs from Top, Higgs, EW and QCD physics. While typically Vector Boson Scattering (VBS) measurements are interpreted in terms of subleading dimension-eight EFT...

4. Quantum Collider probes of the fermionic Higgs Portal

Konstantin Schmid (University and INFN Padova)

29/02/2024, 19:00

Solutions to the dark matter puzzle and the hierarchy problem can include a BSM fermion $\psi$ that is a SM singlet and couples to the visible sector via a Higgs portal interaction: ${\mathcal{L}}_{H\psi }=c_{\psi }/f|H{|}^2\overline{\psi }\psi$. Despite its potential of solving these tensions with the SM being well-established, the study of ${\mathcal{L}}_{H\psi }$ at hadron colliders remains...

6. An Anomaly Detection strategy for new physics searches at the LHC

Giulia Lavizzari (Università degli Studi e INFN Milano (IT))

29/02/2024, 19:12

We introduce a strategy based on unsupervised learning to identify new physics contributions in Vector Boson Scattering events at the LHC.

New physics contributions are modeled within the Standard Model Effective Field Theory (SMEFT) framework. Our anomaly detection strategy relies on Variational AutoEncoders (VAEs), which operate a dimensionality reduction and then map the lower...