A5010856634- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Neutrino Physics Research
- Computational Physics and Python Applications
- Simulation Techniques and Applications
- Advanced Data Storage Technologies
- Superconducting Materials and Applications
- Control Systems and Identification
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Quantum Mechanics and Applications
- Computational Fluid Dynamics and Aerodynamics
- Probabilistic and Robust Engineering Design
- Reservoir Engineering and Simulation Methods
University of Sussex
2023-2025
Deutsches Elektronen-Synchrotron DESY
2022-2024
Kavli Institute for the Physics and Mathematics of the Universe
2024
The University of Tokyo
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca
2021-2022
University of Milano-Bicocca
2019-2022
University of Cambridge
2019
Cavendish Hospital
2016
We provide an overview of the status Monte-Carlo event generators for high-energy particle physics. Guided by experimental needs and requirements, we highlight areas active development, opportunities future improvements. Particular emphasis is given to physics models algorithms that are employed across a variety experiments. These common themes in generator development lead more comprehensive understanding at highest energies intensities, allow be tested against wealth data have been...
We provide an overview of the status Monte-Carlo event generators for high-energy particle physics. Guided by experimental needs and requirements, we highlight areas active development, opportunities future improvements. Particular emphasis is given to physics models algorithms that are employed across a variety experiments. These common themes in generator development lead more comprehensive understanding at highest energies intensities, allow be tested against wealth data have been...
We present results for the Higgsstrahlung process within geneva Monte Carlo framework. combine fully differential next-to-next-to-leading order (NNLO) calculation with higher-order resummation in 0-jettiness resolution variable (beam thrust). The resulting parton-level events are further showered and hadronized by pythia8. beam thrust is carried out to logarithmic accuracy, consistently incorporating all singular virtual real NNLO corrections. It thus provides a natural perturbative...
We present a new calculation for the production of isolated photon pairs at LHC with NNLL$'_{\mathcal{T}_0}$+NNLO accuracy. This is first implementation within GENEVA Monte Carlo framework process nontrivial Born-level definition which suffers from QED singularities. Throughout computation we use smooth-cone isolation algorithm to remove such divergences. The higher-order resummation 0-jettiness resolution variable $\mathcal{T}_0$ based on factorisation formula derived Soft-Collinear...
A bstract We study the resummation of 0-jettiness resolution variable $$ \mathcal{T} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>T</mml:mi> </mml:math> 0 for top-quark pair production process in hadronic collisions. Starting from an effective theory framework we derive a factorisation formula this observable which allows its at any logarithmic order → limit. then calculate \mathcal{O} <mml:mi>O</mml:mi> ( α s ) corrections to soft function matrices and, by employing...
We solve the integration-by-parts (IBP) identities needed for computation of any planar two-loop five-point massless amplitude in QCD. also derive some new results most complicated non-planar topology with irreducible numerators power as high six. do this by applying a strategy solving IBP which scales better problems large number and/or master integrals. Our are proof principle that remaining contributions all QCD amplitudes can be computed analytic form.
We extend the geneva Monte Carlo framework using transverse momentum of a color-singlet system as resolution variable. This allows us to use next-to-next-to-next-to-leading-logarithm (${\mathrm{N}}^{3}\mathrm{LL}$) resummation via radish formalism obtain precise predictions for any production process at fully exclusive level. Thanks implementation two different variables within framework, we are able assess impact such choice on differential observables first time. As application, present...
We present the resummation of one-jettiness for color-singlet plus jet production process <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>p</a:mi><a:mi>p</a:mi><a:mo stretchy="false">→</a:mo><a:mo stretchy="false">(</a:mo><a:msup><a:mi>γ</a:mi><a:mo>*</a:mo></a:msup><a:mo>/</a:mo><a:mi>Z</a:mi><a:mo stretchy="false">→</a:mo><a:msup><a:mo>ℓ</a:mo><a:mo>+</a:mo></a:msup><a:msup><a:mo>ℓ</a:mo><a:mo>−</a:mo></a:msup><a:mo...
We present a novel next-to-next-to-leading order (NNLO) QCD calculation matched to parton shower for the production of pair $Z$ bosons decaying four massless leptons, $p p \to \ell^+ \ell^- \ell'^+ \ell'^- + X$, at LHC. Spin correlations, interferences and off-shell effects are included throughout. Our result is based on resummed beam-thrust spectrum, which we evaluate next-to-next-to-leading-logarithmic (NNLL$'_{\mathcal{T}_0}$) accuracy first time this process, makes use GENEVA Monte Carlo...
A bstract Measurements of Higgs boson processes by the ATLAS and CMS experiments at LHC use Simplified Template Cross Sections (STXS) as a common framework for combination measurements in different decay channels their further interpretation, e.g. to measure couplings. The production are measured predefined kinematic regions — STXS bins requiring precise theory predictions each individual bin. In gluon-fusion main division is into 0-jet, 1-jet, ≥ 2-jet bins, which subdivided transverse...
A number of phenomenologically relevant processes at hadron colliders, such as Higgs and Z boson production in association with b quarks, can be conveniently described scattering heavy quarks the initial state. We present a detailed analysis this class processes, identifying form leading initial-state collinear logarithms that allow relation calculations performed different flavour schemes simple reliable way. This procedure makes it possible to assess size logarithmically enhanced terms...
We present an event generator for the process $pp\to \ell\nu_\ell\gamma$ at next-to-next-to-leading order (NNLO) in QCD and matched to PYTHIA8 parton shower. The calculation makes use of GENEVA framework, which combines a resummed obtained via Soft-Collinear Effective Theory (SCET) with fixed-order result. validate NNLO accuracy our results by comparing predictions inclusive quantities independent calculation, then 0-jettiness spectrum logarithmic (NNLL$'$) accuracy. Finally, we compare...
We study the transverse momentum (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>q</a:mi><a:mi>T</a:mi></a:msub></a:math>) spectrum of Higgs boson produced via annihilation massive quarks (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mi>s</c:mi></c:mrow></c:math>, <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mrow><e:mi>c</e:mi></e:mrow></e:math>, <g:math...
Abstract We examine the ability of experimental measurements top-quark pair production to constrain both mass and strong coupling within global MSHT parton distribution function (PDF) fit. Specifically, we consider ATLAS CMS differential distributions taken at a centre-of-mass energy 8 TeV, as well $$ t\bar{t}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> total cross section data...
We describe a number of improvements to the GENEVA method for matching NNLO calculations parton shower programs. In particular, we detail changes resummed calculation used in procedure, including disentangling cross section dependence on factorisation and beam scales, an improved treatment timelike logarithms. also discuss modifications implementation splitting functions which serve make differential higher multiplicity phase space. These improve stability numerical cancellation nonsingular...
In this work, we study the production of Higgs boson pairs at next-to-next-to-leading order in QCD matched to parton showers, using \textsc{Geneva} framework and working heavy-top-limit approximation. This includes resummation large logarithms zero-jettiness $\mathcal{T}_0$ up next-to-next-to-next-to-leading-log accuracy. process features an extremely momentum transfer, which makes its particularly relevant for matching schemes such as that employed \textsc{Geneva}, where a variable...
A bstract We present the NNLL′ resummed 2-jettiness distribution for decays of Standard Model Higgs boson to a b $$ \overline{b} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> -quark pair and gluons. The calculation exploits factorisation formula derived using Soft-Collinear Effective Theory, in which large logarithms are by renormalisation group evolution hard, soft jet contributions differential decay...
A bstract We construct a novel event generator for the process $$ pp\to {\ell}^{-}{\overline{\nu}}_{\ell }{\ell^{\prime}}^{+}{\nu}_{\ell^{\prime }} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>pp</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:msub> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:msub> <mml:mo>′</mml:mo> <mml:mo>+</mml:mo> </mml:math> , which matches fixed-order predictions at...
We present a joint extraction of the strong coupling $α_s$ and top-quark pole mass $m_t$ from measurements pair production performed by ATLAS CMS experiments at 8 TeV LHC. For first time, differential NNLO theory predictions for different values are utilised four kinematic distributions: average transverse momentum top-quark, its rapidity invariant rapidity. The use fastNLO tables these distributions allows rapid evaluation PDF sets. consider single both separately in combination order to...
We present the resummation of one-jettiness for colour-singlet plus jet production process $p p \to ( \gamma^*/Z \ell^+ \ell^-) + {\text{jet}}$ at hadron colliders up to fourth logarithmic order (N$^3$LL). This is first this processes involving three coloured partons Born level. match our formula corresponding fixed-order predictions, extending validity results regions phase space where further hard emissions are present. result paves way construction next-to-next-to-leading simulations...
Measurements of Higgs boson processes by the ATLAS and CMS experiments at LHC use Simplified Template Cross Sections (STXS) as a common framework for combination measurements in different decay channels their further interpretation, e.g. to measure couplings. The production are measured predefined kinematic regions -- STXS bins requiring precise theory predictions each individual bin. In gluon-fusion main division is into 0-jet, 1-jet, $\geq 2$-jet bins, which subdivided transverse momentum...
Calculations truncated at a fixed order in perturbation theory are accompanied by an associated theoretical uncertainty, which encodes the missing higher orders (MHOU). This is typically estimated scale variation procedure, has well-known shortcomings. In this work, we propose simple prescription to directly encode terms using nuisance parameters (TNPs) and estimate uncertainty their variation. We study multiple processes relevant for Large Hadron Collider physics next-to-leading...
We investigate the impact of dimension-8 operators on $W^+W^-$ production at LHC for incoming gluon-gluon channel. To this end, we have identified all CP-even contributing to process in question, and computed corresponding tree-level helicity amplitudes fully-leptonic decays $W$ bosons. These are implemented program MCFM-RE, which automatically incorporates effect a jet-veto reduce otherwise overwhelming $t\bar t$ background. find that, unless break hierarchy effective field theory (EFT),...