A5012170165- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Ionosphere and magnetosphere dynamics
- Dark Matter and Cosmic Phenomena
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Advanced Data Storage Technologies
- Neutrino Physics Research
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Air Traffic Management and Optimization
- Geomagnetism and Paleomagnetism Studies
- Particle Accelerators and Free-Electron Lasers
- Meteorological Phenomena and Simulations
- Aerospace and Aviation Technology
- Earthquake Detection and Analysis
- Distributed and Parallel Computing Systems
National Institute for Subatomic Physics
2018-2020
Laboratoire de Physique Théorique et Hautes Energies
2018-2020
Sorbonne Université
2018-2019
Centre National de la Recherche Scientifique
2018-2019
University of Glasgow
2014-2018
Queen Mary University of London
2017
UCLouvain
2017
Heidelberg University
2016
The Fortran LHAPDF library has been a long-term workhorse in particle physics, providing standardised access to parton density functions for experimental and phenomenological purposes alike, following on from the venerable PDFLIB package. During Run 1 of LHC, however, several fundamental limitations LHAPDF’s design have became deeply problematic, restricting usability important physics-study procedures dangerous avenues by which silently obtain incorrect results. In this paper we present 6...
This document a outlines set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these have when applied searches at LHC, provide number useful expressions reference. The list includes both s-channel t-channel scenarios. For s-channel, spin-0 spin-1 mediations are discussed, also realizations where Higgs particle provides portal between visible sectors. guiding principles underpinning proposed...
This report of the BOOST2012 workshop presents results four working groups that studied key aspects jet substructure. We discuss potential first-principle QCD calculations to yield a precise description substructure jets and study accuracy state-of-the-art Monte Carlo tools. Limitations experiments' ability resolve are evaluated, with focus on impact additional (pile-up) proton collisions performance in future LHC operating scenarios. A final section summarizes lessons learnt from analyses...
Based on the established task of identifying boosted, hadronically decaying top quarks, we compare a wide range modern machine learning approaches. Unlike most methods they rely low-level input, for instance calorimeter output. While their network architectures are vastly different, performance is comparatively similar. In general, find that these new approaches extremely powerful and great fun.
The move towards simplified models for Run II of the LHC will allow stronger and more robust constraints on dark sector. However there already exists a wealth I data which should not be ignored in run-up to II. Here we reinterpret public generic beyond-standard-model cross sections place new model. We make use an ATLAS search monojet $+$ missing energy channel constrain representative model with matter coupling axial-vector $Z'$. scan entire parameter space our chosen set strongest current...
We compare the performance of a convolutional neural network (CNN) trained on jet images with dense networks (DNNs) n-subjettiness variables to study distinguishing power these two separate techniques applied top quark decays. find that they perform almost identically and are highly correlated once mass information is included, which suggests accessing same underlying can be intuitively understood as being contained in 4-, 5-, 6-, 8-body kinematic phase spaces depending sample. This both...
The search for di-Higgs production at the LHC in order to set limits on Higgs trilinear coupling and constraints new physics is one of main motivations high-luminosity phase. Recent experimental analyses suggest that such will only be successful if information from a range channels included. We therefore investigate association with two hadronic jets give detailed discussion both gluon- weak boson-fusion (WBF) contributions, particular emphasis phenomenology modified quartic gauge couplings....
Radio occultation (RO) provides a cost-effective component of the overall sensor mix required to characterise ionosphere over wide areas and in where it is not possible deploy ground sensors. The paper describes RO constellation that has been developed deployed by Spire Global. This its associated infrastructure are now producing data can be used bulk ionosphere, lower perturbations, ionospheric scintillation.
We describe the design and implementation of detector-bias emulation in Rivet MC event analysis system. Implemented using C++ efficiency kinematic smearing functors, it allows detector effects to be specified within an routine, customised exact phase-space reconstruction working points analysis. A set standard functions for physics objects Runs 1 2 ATLAS CMS experiments is also provided. Finally, as jet substructure important class observable usually considered require explicit simulation,...
We investigate the prospects to systematically improve generic effective field theory-based searches for new physics in top sector during LHC run 2 as well high luminosity phase. In particular, we assess benefits of momentum transfer final states on EFT-fit a function systematic uncertainties comparison with sensitivity expected from fully-resolved analyses focusing tt¯ production. find that constraints are typically driven by selections, while boosted quarks can serve break degeneracies...
Dark sectors with strong interactions have received considerable interest. Assuming the existence of a minimally coupled dark sector which runs to in infrared, we address question whether scaling behavior this can be observed missing energy signatures at present and future hadron colliders. We compare these findings concrete case self-interacting matter demonstrate that dependence high-momentum transfer final states principle used gain information about UV structure hidden colliders, subject...
Multilepton searches for electroweakino and slepton pair production at hadron colliders remain some of the best means to test weak-scale supersymmetry. Searches CERN Large Hadron Collider, however, are limited by large diboson top quark backgrounds, despite application traditional, central jet vetoes. In this context, we report impact introducing dynamic vetoes in colorless superpartners. As a representative scenario, consider Drell-Yan right-handed smuons decaying into dimuon system...
This study presents a new methodology to automatically classify perturbations in the lower ionosphere using GNSS radio occultation (RO) observations collected Spire’s constellation of CubeSats. combines signal processing techniques with semi-supervised machine learning by applying spectral clustering metric space wavelet spectra. A “bottom-up” algorithm was applied extract E layer information directly from high-rate (50 Hz) GNSS-RO profiles subtracting effect F layers. has been implemented...
Theories where a fermionic dark matter candidate interacts with the Standard Model through vector mediator are often studied using minimal models, which not necessarily anomaly-free. In fact, anomaly-free simplified models usually strongly constrained by either direct detection experiments or collider searches for dilepton resonances. this paper, we study phenomenology of that couples axially to leptophobic mediator. Canceling anomalies in these requires considerably enlarging their field...
Perturbative probability conservation provides a strong constraint on the presence of new interactions Higgs boson. In this work we consider $CP$-violating in conjunction with unitarity constraints gauge-Higgs and fermion-Higgs sectors. Injecting signal strength measurements recently discovered boson allows us to make concrete correlated predictions how $CP$ violation sector can be directly constrained through collider searches for either characteristic states or telltale enhancements...
Trilinear $Z$ boson interactions are sensitive probes both of new sources $CP$ violation in physics beyond the standard model and particle thresholds. Measurements trilinear typically interpreted frameworks anomalous couplings effective field theory, which require care interpretation. To obtain a quantitative picture power these measurements when TeV-scale context, we investigate anatomy $ZZZ$ consider two minimal perturbative simplified models induce such through scalar fermion loops at...
We study the phenomenology of associated production a vector boson with pair Higgs bosons (VHH at High-Luminosity LHC (HL-LHC). Despite low rate this channel, scaling cross section suggests measurement could be useful probe modifications trilinear coupling and anomalous interactions in gauge-Higgs sector. focus on both WHH ZHH production, using leptonic ( $ W\rightarrow l \nu$ , Z \rightarrow ll$ Z\rightarrow \nu decay modes HH 4b$ di-Higgs mode. show that top backgrounds are problematic for...
We discuss a global fit of top quark BSM couplings, phrased in the model-independent language higher-dimensional effective operators, to currently available data from LHC and Tevatron. examine interplay between inclusive differential measurements, complementarity Tevatron results. conclude with discussion projections for improvement over Run II.
Muon Space (Muon) is building a constellation of small satellites, many which will carry global navigation satellite system-reflectometry (GNSS-R) receivers. In preparation for the launch this constellation, we have developed generalized deep learning retrieval pipeline, now produces operational GNSS-R near-surface soil moisture retrievals using data from NASA's Cyclone GNSS (CYGNSS) mission. article, describe input datasets, preprocessing methods, model architecture, development and detail...
We provide a comprehensive analysis of the power including top quark-polarisation information to kinematically challenging $t\bar t$ resonance searches, for which ATLAS and CMS start losing sensitivity. Following general modeling strategies pursued by experiments, we analyse semi-leptonic di-lepton channels show that polarisation can lead large improvements in limit setting procedures with data sets. This will allow us set limits parameter choices where sensitivity from $m(t\bar t)$ is not...
We discuss a global fit of top quark BSM couplings, phrased in the model-independent language higher-dimensional effective operators, to currently available data from LHC and Tevatron. examine interplay between inclusive differential measurements, complementarity Tevatron results. conclude with discussion projections for improvement over Run II.