A5018689369- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Geophysical and Geoelectrical Methods
- Black Holes and Theoretical Physics
Getinge (Sweden)
2021
Lund University
2020-2021
University of Milano-Bicocca
2021
New York City College of Technology
2021
City University of New York
2021
The Graduate Center, CUNY
2021
Durham University
2021
Skåne University Hospital
2021
Technical University of Munich
2018-2019
UCLouvain
2014-2018
In this work we present for the first time predictions top-quark pair differential distributions at LHC NNLO QCD accuracy and including EW corrections. For latter include not only contributions of ${\cal O}(\alpha_s^2 \alpha)$, but also those order O}(\alpha_s \alpha^2)$ O}( \alpha^3)$. Besides providing phenomenological all main with stable top quarks, study following issues. 1) The effect photon PDF on top-pair spectra: find it to be strongly dependent set used -- especially $p_T$...
Top quark pair production in association with a Z-boson or photon at the LHC directly probes neutral top-quark couplings. We present predictions for these two processes Standard Model (SM) Effective Field Theory (EFT) next-to-leading order (NLO) QCD. include full set of CP-even dimension-six operators that enter interactions SM gauge bosons. For comparison, we also SMEFT top loop-induced HZ and $$ t\overline{t} ILC NLO Results total cross sections differential distributions are obtained...
We study the charge asymmetry between $t$ and $\bar t$ quark at LHC, when they are produced in association with a $W$ boson. Though sizably reducing cross section respect to inclusive production, requiring boson final state has two important implications. First, leading order QCD, $t \bar t W^{\pm}$ production can only occur via $q q$ annihilation. As result, generated NLO QCD is significantly larger than that of which dominated by gluon fusion. Second, top quarks tend inherit polarization...
This report summarises the properties of Standard Model processes at 100 TeV pp collider. We document production rates and typical distributions for a number benchmark processes, discuss new dynamical phenomena arising highest energies available this intrinsic physics interest in measurement these as well their role backgrounds New Physics searches.
We study the production of a top-quark pair in association with one and two vector bosons, $t \bar t V$ VV$ $V=\gamma, Z, W^\pm$, at LHC. provide predictions next-to-leading order QCD for total cross sections charge asymmetries as well differential distributions. A thorough discussion residual theoretical uncertainties related to missing higher orders parton distribution functions is presented. As an application, we calculate this class processes (together H$ t$ production) hadron colliders...
A bstract We introduce an improvement to the FxFx matrix element merging procedure for pp → $$ t\overline{t}W <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>W</mml:mi> </mml:math> production at NLO in QCD with one and/or two additional jets. The main modification is improved treatment of jets that are not logarithmically enhanced low transverse-momentum regime. provide predictions inclusive cross section and...
A bstract This work studies the associated production of a top-quark pair with W, Z, or Higgs boson at LHC. Predictions for total cross sections as well several differential distributions massive particles in final state are provided. These predictions, valid LHC operating 13 TeV, include without any approximation all NLO electroweak and QCD contributions O (α s α j+1 ) i + j = 2, 3. In addition, predictions presented here improve upon results by adding effects soft gluon emission...
We provide the most up-to-date predictions for top-quark charge asymmetry ${A}_{\mathrm{C}}$ at LHC with a center-of-mass energy of 8 TeV. Our result is accurate NNLO level in strong interactions and complete-NLO both electroweak interactions. present results inclusive ${A}_{\mathrm{C}}$, several differential asymmetries as well ${p}_{T,t\overline{t}}$ ${m}_{t\overline{t}}$ cumulative asymmetries. Similarly to Tevatron forward-backward ${A}_{\mathrm{FB}}$, QCD NLO EW corrections are found be...
We discuss the impact of EW corrections on differential distributions in top-quark pair production at LHC and future hadron colliders, focusing effects initial-state photons. Performing a calculation Next-to-Leading Order QCD+EW accuracy, we investigate detail photon-initiated channels central values as well PDF scale uncertainties, both order $\alpha_s\alpha$ $\alpha_s^2\alpha$. present predictions 13 100 TeV, provide results for 8 TeV measurements performed by ATLAS CMS. A thorough...
Top quark pair production in association with a $Z$-boson or photon at the LHC directly probes neutral top-quark couplings. We present predictions for these two processes Standard Model (SM) Effective Field Theory (EFT) next-to-leading (NLO) order QCD. include full set of CP-even dimension-six operators that enter interactions SM gauge bosons. For comparison, we also SMEFT top loop-induced $HZ$ and $t\bar{t}$ ILC NLO Results total cross sections differential distributions are obtained...
Abstract Recently a slight tension between data and predictions has been reported in $$t\bar{t}W$$ <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:mi>W</mml:mi> </mml:math> production by both the CMS ATLAS collaborations. We revisit theoretical for this process, focussing on following two effects. disentangle various effects that lead to asymmetries among leptonic decay products of (anti-)top...
A bstract In this work we compute for the first time so-called Complete-NLO predictions top-quark pair hadroproduction in association with at least one isolated photon ( t $$ \overline{t} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> γ ). We also NLO QCD+EW similar case two photons γγ ) and single-top photon. addition, complement our results of hadronic leptonic decays including an All these have been...
A bstract In this work we calculate the cross sections for hadroproduction of a single top quark or antiquark in association with Higgs ( tHj ) Z boson tZj at NLO QCD+EW accuracy. case production consider both undecayed and complete final state tℓ + ℓ − j , including off-shell non-resonant effects. We perform our calculation five-flavour-scheme (5FS), without selecting any specific channel s -, t - tW associated). Moreover, provide more realistic estimate theory uncertainty by carefully...
Anomalous self-interactions of non-abelian gauge fields can be described by higher dimensional operators featuring gauge-invariant combinations the field strengths. In case QCD, gluon start to modified at dimension six type $GGG$, with $G$ strength tensor, possibly leading deviations in all observables and measurements that probe strong interactions very small distances. this work we consider sensitivity triple operator a series LHC di-jet, three- multi-jet final states heavy-quark...
Abstract In this work we investigate the NLO QCD+EW corrections to top quark pair production and their effects on spin correlation coefficients asymmetries at fixed-order LO decay in dilepton channel, within narrow-width approximation. The correlations are implicitly measured through lepton kinematics. Moreover study EW leptonic differential distributions. We find that $$t {\bar{t}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover>...
A bstract In this work we calculate and provide precise predictions for the signature that is typically exploited at LHC measurement of t -channel single-top production: 1 lepton, light jet, b -jet, Ɇ T no additional jets or leptons. We apply cuts define fiducial region take into account all contributions to signature; not only those from resonant production. On one hand, complete-NLO corrections, i.e., NLO effects QCD EW origin. other study in detail impact a parton shower consider....
We describe predictions for top-quark pair differential distributions at hadron colliders, which combine state-of-the-art NNLO QCD calculations and NLO electroweak corrections together with double resummation NNLL$'$ accuracy of threshold logarithms small-mass logarithms. This is the first time that such a combination has appeared in literature. Numerical results are presented invariant-mass distribution, transverse-momentum distribution as well rapidity distributions.
In this proceedings we compare phenomenological predictions for differential distributions in top-quark pair production at the LHC. particular consider NNLO QCD fixed-order and parton-level based on NLO multi-jet merging following MEPS@NLO scheme. both electroweak (EW) corrections are incorporated different approximations. We focus several transverse-momentum invariant mass distribution, highly relevant ongoing physics program discuss comparisons between considered approximations their...
We calculate all main top-quark pair differential distributions at the Tevatron. For first time Tevatron predictions for this process include Standard Model corrections through NLO (referred to as complete-NLO) consistently combined with previously computed NNLO QCD corrections. also assess, time, impact of dynamical scales on latest measurements.
In this proceeding we present the combination of NNLO QCD and NLO EW corrections to $t \bar t$ distributions, focusing on effect photon PDF. We compare LUXQED NNPDF3.0QED PDF sets for specific distributions. further discuss with respect pure ones including scale uncertainties both these sets. focus top-quark pair invariant mass, transverse momentum 13 TeV rapidity 8 TeV.