Phenomenology 2023 Symposium

Session

BSM IX

9 May 2023, 14:00

University of Pittsburgh

Conveners

BSM IX

• Sandra Kvedaraite

170. Drell-Yan tails as flavour probes of new physics

Lukas Allwicher (University of Zurich)

09/05/2023, 14:00

BSM

The study of high-$p_T$ tails at the LHC can be a complementary probe to low-energy observables when investigating the flavour structure of the Standard Model and its extensions. The Mathematica package HighPT allows to compute Drell-Yan cross-sections for dilepton and monolepton final states at the LHC. The observables can be computed at tree-level in the SMEFT, including the relevant...

153. Drell-Yan Bound on Continuum Spectra from Extra Dimensions

Mr Torrey Saxton (University of Notre Dame)

09/05/2023, 14:15

BSM

We present bounds on 5D theories that have a mass gap followed by a continuous spectrum. These theories involve a metric with a warp factor and are controlled by a single parameter ρ. Using Drell-Yan data simulated from MadGraph, Pythia8, and Delphes for charged lepton and dilepton events we perform a χ2 analysis for the differential cross section predicted by the 5D theory and measured by the...

234. Exploring the Flavor Symmetry landscape of Composite Higgs models

Lorenzo Ricci

09/05/2023, 14:30

BSM

Flavor and CP violating observables strongly constrain new Physics at the TeV scale. This is the case for Composite Higgs models, where “standard” constructions only partially screen
dangerous flavor effects, pushing up the new physics scale far from the LHC reach.

Specific assumptions for the flavor structure of the composite sector suppress unwanted effects, allowing for a lower new...

76. Anomalies, Representations and Self-Supervision

Luigi Favaro

09/05/2023, 14:45

BSM

Autoencoders are an effective analysis tool for model-agnostic searches at the LHC. Unfortunately, it is known that their OOD detection performance is not robust and heavily depends on the compressibility of the signals. Even if a neural network can learn the physical content of the low-level data, the gain in sensitivity to features of interest can be hindered by redundant information already...

48. Deep Learning Symmetries in Physics and Beyond

Roy Forestano

09/05/2023, 15:00

BSM

We design a deep-learning algorithm for the discovery and identification of the continuous group of symmetries present in a labeled dataset. We use fully connected neural networks to model the symmetry transformations and the corresponding generators. We construct loss functions that ensure that the applied transformations are symmetries and that the corresponding set of generators forms a...

220. Entangled Taus at Colliders

Prisco Lo Chiatto (JGU Mainz / PRISMA+)

09/05/2023, 15:15

BSM

Studies of entanglement and other quantum information measures at colliders have recently been proposed to probe fundamental interactions at high energies. Inspired by these results, we examine tau pair productions at both lepton and hadron colliders, to probe dimension-6 dipole operators in the Standard Model Effective Field Theory (SMEFT).
The SMEFT contributions are found to be sizable in...

222. Entanglement and Bell's inequalities with boosted semi-leptonic top quarks at the LHC

Alberto Navarro

09/05/2023, 15:30

The Large Hadron Collider provides an excellent environment to study quantum entanglement and Bell's inequality at high energies. We explore the possible observation of entanglement and violation of Bell's inequality in the semi-leptonic channel of top quark pair production. We show that boosted top quarks are required to ensure they are spacelike separated. The density matrix of the top-pair...

67. On two-body and three-body spin correlations in leptonic $t\bar{t}Z$ production and anomalous couplings at the LHC

Rafiqul Rahaman (Harish-Chandra Research Institute, Prayagarj, India)

09/05/2023, 15:45

BSM

We study the anomalous $t\bar{t}Z$ couplings in the $t\bar{t}Z$ production in leptonic final state at the $13$ TeV LHC. We use the polarizations of top quarks and $Z$ boson, two-body and three-body spin correlations among the top quarks and $Z$ boson, and the cross section to probe the anomalous couplings. We estimate one parameter and simultaneous limits on the couplings of the effective...