A5070196685- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Quantum Computing Algorithms and Architecture
- Superconducting Materials and Applications
- Noncommutative and Quantum Gravity Theories
- Computational Physics and Python Applications
- Particle accelerators and beam dynamics
- Cosmology and Gravitation Theories
- International Science and Diplomacy
- Algebraic and Geometric Analysis
- Neutrino Physics Research
- Quantum Information and Cryptography
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Electromagnetic Scattering and Analysis
- Quantum and electron transport phenomena
- Quantum optics and atomic interactions
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
Universitat de València
2014-2024
Instituto de Física Corpuscular
2015-2024
Consejo Superior de Investigaciones Científicas
2015-2024
Czech Academy of Sciences, Institute of Physics
1999-2024
University of Warsaw
2024
University of Alberta
2024
Eötvös Loránd University
2024
University of Debrecen
2024
Universidad de Salamanca
2024
Unidades Centrales Científico-Técnicas
2024
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...
A sizable difference in the differential production cross section of top quarks and antiquarks, respectively, is predicted for hadronically produced heavy quarks. It order ${\ensuremath{\alpha}}_{s}$ arises from interference between charge odd even amplitudes, respectively. For Fermilab Tevatron it amounts up to 15% distribution suitable chosen kinematical regions. The resulting integrated forward-backward asymmetry 4--5 % could be measured next round experiments. At CERN LHC can studied by...
A sizable difference in the differential production cross section of top and antitop quarks, respectively, is predicted for hadronically produced heavy quarks. It order ${\ensuremath{\alpha}}_{s}$ arises from interference between charge odd even amplitudes, respectively. For Fermilab Tevatron it amounts to up $15%$ distribution suitable chosen kinematical regions. The resulting integrated forward-backward asymmetry $4%--5%$ could be measured next round experiments. At CERN Large Hadron...
Axigluons are colored heavy neutral gauge bosons that couple to quarks through an axial vector current and the same strong coupling as gluons. The most important model-independent manifestation of axigluons is generation a forward--backward asymmetry in top-antitop quark production at $p\overline{p}$ collisions, which originates from charge asymmetry. We update our previous analysis for inclusive QCD induced define new observable more sensitive effect than Furthermore, we find lower limit...
This report summarizes the activities of SM and NLO Multileg Working Group Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 2009.
Abstract In this manuscript, we report the outcome of topical workshop: paving way to alternative NNLO strategies ( https://indico.ific.uv.es/e/WorkStop-ThinkStart_3.0 ), by presenting a discussion about different frameworks perform precise higher-order computations for high-energy physics. These approaches implement novel deal with infrared and ultraviolet singularities in quantum field theories. A special emphasis is devoted local cancellation these singularities, which can enhance...
Recent measurements of the top quark charge asymmetry at Tevatron disfavor existence flavor universal axigluons and colorons $2\ensuremath{\sigma}$. In this letter, we explore possibility reconciling data with these models use invariant mass distribution top-antitop pair events to constrain couplings massive color-octet gauge bosons decaying quarks.
We extend the four-dimensional unsubtraction method, which is based on loop-tree duality (LTD), to deal with processes involving heavy particles. The method allows perform summation over degenerate IR configurations directly at integrand level in such a way that NLO corrections can be implemented four space-time dimensions. define general momentum mapping between real and virtual kinematics accounts properly for quasi-collinear configurations, leads an smooth massless limit. illustrate first...
The abundance of infrared singularities in gauge theories due to unresolved emission massless particles (soft and collinear) represents the main difficulty perturbative calculations. They are typically regularized dimensional regularization, their subtraction is usually achieved independently for virtual real corrections. In this paper, we introduce a new method based on loop-tree duality (LTD) theorem accomplish summation over degenerate states directly at integrand level such that...
We give an introduction to several regularization schemes that deal with ultraviolet and infrared singularities appearing in higher-order computations quantum field theories. Comparing the computation of simple quantities various schemes, we point out similarities differences between them.
We present a first numerical implementation of the loop–tree duality (LTD) method for direct computation multi-leg one-loop Feynman integrals. discuss in detail singular structure dual integrands and define suitable contour deformation loop three-momentum space to carry out integration. Then we apply LTD ultraviolet infrared finite integrals, explicit results scalar tensor integrals with up eight external legs (octagons). The features an excellent performance independently number legs.
Multiloop scattering amplitudes describing the quantum fluctuations at high-energy processes are main bottleneck in perturbative field theory. The loop-tree duality is a novel method aimed overcoming this by opening loop into trees and combining them integrand level with real-emission matrix elements. In Letter, we generalize to all orders expansion using complex Lorentz-covariant prescription of original one-loop formulation. We introduce series mutiloop topologies arbitrary internal...
Several models predict the existence of heavy colored resonances decaying to top quarks in TeV energy range that might be discovered at CERN LHC. In some those models, moreover, a sizable charge asymmetry versus antitop generated. The detection these exotic resonances, however, requires selecting data samples where and are highly boosted, which is experimentally very challenging. We asses measurement quark LHC sensitive excited states gluon with axial-vector couplings quarks. use toy model...
We present a new algorithm to construct purely four dimensional representation of higher-order perturbative corrections physical cross-sections at next-to-leading order (NLO). The is based on the loop-tree duality (LTD), and it implemented by introducing suitable mapping between external loop momenta virtual scattering amplitudes, real emission corrections. In this way, sum over degenerate infrared states performed integrand level cancellation divergences occurs locally without subtraction...
In this paper, we address the question of whether almost four standard deviations difference between theory and experiment for muon anomalous magnetic moment ${a}_{\ensuremath{\mu}}$ can be explained as a higher-order Standard Model perturbation effect in pion form factor measurements. This has, until now, remained open, obscuring source discrepancies We calculate last radiative corrections extraction factor, which were believed to potentially substantial enough explain data within Model....
We extend useful properties of the $H\to\gamma\gamma$ unintegrated dual amplitudes from one- to two-loop level, using Loop-Tree Duality formalism. In particular, we show that universality functional form -- regardless nature internal particle still holds at this order. also present an algorithmic way renormalise amplitudes, by locally cancelling ultraviolet singularities integrand thus allowing a full four-dimensional numerical implementation method. Our results are compared with analytic...
A bstract The perturbative approach to quantum field theories has made it possible obtain incredibly accurate theoretical predictions in high-energy physics. Although various techniques have been developed boost the efficiency of these calculations, some ingredients remain specially challenging. This is case multiloop scattering amplitudes that constitute a hard bottleneck solve. In this paper, we delve into application disruptive technique based on loop-tree duality theorem, which aimed at...
The Loop-Tree Duality (LTD) theorem is an innovative technique to deal with multi-loop scattering amplitudes, leading integrand-level representations over a Euclidean space. In this article, we review the last developments concerning framework, focusing on manifestly causal representation of Feynman integrals and definition dual local counter-terms cancel infrared singularities.