A5086587541- 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
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Computational Fluid Dynamics and Aerodynamics
- Dark Matter and Cosmic Phenomena
- International Science and Diplomacy
- Big Data Technologies and Applications
- Atomic and Subatomic Physics Research
- Probabilistic and Robust Engineering Design
- Radiation Effects in Electronics
- Scientific Computing and Data Management
- Control Systems and Identification
Institute of Nuclear Physics, Polish Academy of Sciences
2023-2025
Cracow University of Technology
2024
Jagiellonian University
2024
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2024
University of Cambridge
2019-2023
RWTH Aachen University
2018-2021
This report presents a short summary of the activities "Standard Model" working group for "Physics at TeV Colliders" workshop (Les Houches, France, 12-30 June, 2023).
We compute the NNLO QCD corrections to three-photon production at LHC. This is first calculation for a $2\to 3$ process. Our exact, except scale-independent part of two-loop finite remainder which included in leading color approximation. estimate size missing and find them be phenomenologically negligible. compare our predictions with available 8 TeV measurement from ATLAS collaboration. that inclusion eliminates existing significant discrepancy respect NLO predictions, paving way precision...
We calculate the NNLO QCD corrections to diphoton production with an additional jet at LHC. Our calculation represents first NNLO-accurate prediction for transverse momentum distribution of system. The improvement in accuracy theoretical is significant, by a factor up four relative NLO QCD. exact except finite remainder two-loop amplitude which included leading color. numerical impact this approximated contribution small. results work are expected further our understanding Higgs boson sector...
Multijet rates at hadron colliders provide a unique possibility for probing quantum chromodynamics (QCD), the theory of strong interactions. By comparing predictions with collider data, one can directly test perturbative QCD, extract fundamental parameters like coupling α_{s}, and search physics beyond standard model. In this work we calculate, first time, next-to-next-to-leading order (NNLO) QCD corrections to typical three-jet observables differential three-to-two jet ratios. The...
A bstract We calculate a comprehensive set of spin correlations and differential distributions in top-quark pair production decay to dilepton final states. Our calculation is performed the Narrow Width Approximation. This first time such complete study at next-to-next-to leading order QCD. Both inclusive fiducial are presented analyzed. Good agreement between NNLO QCD predictions data found. demonstrate that it possible perform high-precision comparisons fixed-order calculations with...
A bstract Flavour tagging is technically challenging on the experimental side. However, it suffers from a more fundamental problem theoretical point of view, in particular when implemented fixed-order perturbation theory. It turns out that an infrared-safe definition flavoured jet intricate due to singularities induced by emission quark-anti-quark pairs negligible energy. Although this issue has been addressed modification standard k T algorithm, situation not entirely satisfactory as most...
A bstract In this work, we provide a comprehensive set of differential cross-section distributions for photon + di-jet production in proton-proton collisions with next-to-next-to-leading order precision massless QCD. The event selection corresponds to recent measurements by the ATLAS collaboration. We observe an improved description data comparison lower-order calculations case observables that are expected be well described perturbation theory. results also show better agreement than...
A bstract In this work we perform the first ever calculation of jet event shapes at hadron colliders next-to-next-to leading order (NNLO) in QCD. The inclusion higher corrections removes shape difference observed between data and next-to-leading predictions. theory uncertainty NNLO is comparable to, or slightly larger than, existing measurements. Except for narrow kinematical ranges where all-order resummation becomes important, predictions considered present are reliable. As a prime...
A bstract We present the double-virtual amplitudes contributing to production of a Higgs boson in association with $$ b\overline{b} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>b</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> pair at Large Hadron Collider. perform computation within five-flavour scheme, which employs massless bottom quarks and finite bottom-Yukawa coupling, taking into account all colour structures. derive analytic form helicity through...
We calculate, for the first time, next-to-next-to-leading order (NNLO) QCD corrections to spin correlations in top quark pair production at LHC. The NNLO play an important role description of corresponding differential distributions. observe that standard model calculation describes available $\mathrm{\ensuremath{\Delta}}{\ensuremath{\phi}}_{\ensuremath{\ell}\ensuremath{\ell}}$ data fiducial region but does not agree with measurement extrapolated full phase space. Most likely this...
Next-to-next-to-leading order QCD predictions for single-, double- and even triple-differential distributions of jet events in proton-proton collisions have recently been obtained using the NNLOjet framework based on antenna subtraction. These results are an important input Parton Distribution Function fits to hadron-collider data. While these calculations include all partonic channels occurring at this perturbative expansion, they leading-color approximation case involving quarks only exact...
A bstract We calculate all planar contributions to the two-loop massless helicity amplitudes for process $$ q\overline{q} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>q</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> → γγγ . The results are presented in fully analytic form terms of functional basis proposed recently by Chicherin and Sotnikov. With this publication we provide already used us NNLO QCD calculation LHC pp [ Chawdhry et al. (2019) ]. Our...
We calculate the complete set of two-loop leading-colour QCD helicity amplitudes for $\gamma \gamma j$-production at hadron colliders. Our results are presented in a compact, fully-analytical form.
We study the production of a W boson in association with c-jet at LHC. calculate, for first time, complete set NNLO QCD corrections to dominant CKM-diagonal contribution this process. Both signatures, ${\rm p}{\rm p}\to \mu^+\nu_\mu{\rm j}_{\rm c}$ and \mu^-\bar\nu_\mu{\rm are considered. present predictions fiducial cross sections differential distributions each one two signatures as well their ratio. The theoretical compared ATLAS measurements $7 \; {\rm TeV}$. results work essential...
Longitudinal polarisation of the weak bosons is a direct consequence Electroweak symmetry breaking mechanism providing an insight into its nature, and instrumental in searches for physics beyond Standard Model. We perform study diboson production $p p \to e^+\nu_e\mu^-\bar\nu_\mu$ process at NNLO QCD fiducial setup inspired by experimental measurements ATLAS. This first NNLO. employ double-pole approximation framework polarised calculation, investigate effects arising differential distributions.
The authors compute the next-to-next-to-leading order (NNLO) QCD corrections to production of a W-boson in association with bottom- quark pair at hadron colliders. This calculation is very first $2$ \ensuremath{\rightarrow} $3$ process massive external particle be studied such perturbative order. present numerical results for cross section and differential distributions this LHC 8 TeV center-of-mass energy.
A bstract In this work we derive three sets of non-perturbative fragmentation functions, with uncertainties, for B -hadrons, J / ψ ’s and muons resulting from semileptonic decays. All are next-to-next-to leading order accuracy include logarithmic soft gluon resummation. The novel feature these new is that they fully consistent our formalism (NNLO) calculations final states identified , or a μ . We employ the functions derived in to make state art predictions such $$ t\overline{t} <mml:math...
We calculate, for the first time, NNLO QCD corrections to identified heavy hadron production at colliders. The calculation is based on a flexible numeric framework which allows of any distribution single plus jets and non-QCD particles. As application we provide predictions several differential distributions $B$ hadrons in $t\bar t$ events LHC. Among others, these are needed precise determination top quark mass. extension our results other processes, like open or associated charm...
A bstract State-of-the-art analyses of W+c-jet production at the LHC require precise predictions. In present work, we study in detail impact off-diagonal CKM elements up to next-to-next-to leading order QCD, influence flavored jet algorithms, and size electroweak corrections. addition, also investigate phenomenological aspects related exact definition process. We find that all these effects can be several per cent for both fiducial cross section differential distributions. They are,...
We evaluate the top-bottom interference contribution to fully inclusive Higgs production cross section at next-to-next-to-leading order in QCD. Although bottom-quark-mass effects are power suppressed, accuracy of state-of-the-art theory predictions makes an exact determination this effect indispensable. The total 13 TeV is -1.99(1)_{-0.15}^{+0.30} pb, while pure O(α_{s}^{4}) correction 0.43 pb. With result, we address one leading uncertainties section.
We present the two-loop virtual amplitudes for heavy-quark pair production in light quark-antiquark annihilation and gluon fusion channels, including full spin color dependence. use expansions around kinematical limits numerical integration to obtain results involved master integrals. From these, we determine renormalised infrared finite remainders of coefficients amplitude decompositions terms structures. The are given form interpolation grids supported by threshold high energy limit....
We study polarisation of W-bosons produced in association with one jet at the LHC. In particular, we provide all necessary theoretical ingredients for precise extraction fractions. To that end, present new polarised predictions up to NNLO QCD accuracy employing narrow-width approximation, two phase spaces: inclusive and fiducial. compare results fiducial space a full off-shell computation as well experimental data. Finally, fit fractions using shape templates show corrections significantly...
Abstract We introduce HighTEA , a new paradigm for deploying fully-differential next-to-next-to leading order (NNLO) calculations collider observables. In principle, any infrared safe observable can be computed and, with very few restrictions, the user has complete freedom in defining their calculation’s setup. For example, one compute generic n -dimensional distributions, define kinematic variables and factorization/renormalization scales, modify strong coupling parton distributions....
Abstract The extraction of the W-boson mass, a fundamental parameter Standard Model, from hadron-hadron collision requires precise theory predictions. In this regard, angular coefficients are crucial to model dynamics production. work, we provide, for first time, at NNLO QCD + NLO EW accuracy finite transverse momentum LHC. corrections can reach up $$10\%$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>10</mml:mn> <mml:mo>%</mml:mo> </mml:mrow> </mml:math> in...