Grigorios Chachamis
A5087394402- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Noncommutative and Quantum Gravity Theories
- Electromagnetic Scattering and Analysis
- Scientific Computing and Data Management
- Computational Physics and Python Applications
- Climate variability and models
- Advanced Thermodynamics and Statistical Mechanics
- Magnetic confinement fusion research
- Quantum Mechanics and Applications
- Neutrino Physics Research
- Spectroscopy and Quantum Chemical Studies
- International Science and Diplomacy
- Astrophysics and Cosmic Phenomena
- Algebraic structures and combinatorial models
- Laser-Plasma Interactions and Diagnostics
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2011-2024
Universidad Publica de Navarra
2024
Universidad Autónoma de Madrid
2015-2019
Consejo Superior de Investigaciones Científicas
2013-2017
University of Calabria
2016-2017
Istituto Nazionale di Fisica Nucleare
2016-2017
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Cosenza
2016-2017
University of Birmingham
2017
Instituto de Física Corpuscular
2013-2016
Universitat de València
2013-2016
Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along beam collision axis, outside acceptance existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from ATLAS interaction point and shielded by concrete rock, will host suite experiments probe standard model (SM) processes search for physics beyond (BSM). In this report, we review status civil engineering plans explore...
The Forward Physics Facility (FPF) is a proposal to create cavern with the space and infrastructure support suite of far-forward experiments at Large Hadron Collider during High Luminosity era. Located along beam collision axis shielded from interaction point by least 100 m concrete rock, FPF will house that detect particles outside acceptance existing large LHC observe rare exotic processes in an extremely low-background environment. In this work, we summarize current status plans for FPF,...
This report summarizes the activities of SM and NLO Multileg Working Group Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 2009.
In high-energy particle physics, the study of particle-particle correlations in proton-proton and heavy-ion collisions constitutes a pivotal frontier effort to understand fundamental dynamics strong force. To best our knowledge, we employ for first time Balitsky-Fadin-Kuraev-Lipatov implemented Monte Carlo code momentum space compute final-state collisions. Our present work aims investigate whether particular limit QCD can contribute long-range rapidity enigmatic ridge effect Published by...
The goal of this report is to give a comprehensive overview the rich field forward physics, with special attention topics that can be studied at LHC.The starts presenting selection Monte Carlo simulation tools currently available, chapter 2, then enters phenomenology QCD low, 3, and high, 4, momentum transfer, while unique scattering conditions central exclusive production are analyzed in 5.The last two experimental topics, Cosmic Ray Heavy Ion physics presented 6 7 respectively.Chapter 8...
The 2011 Les Houches workshop was the first to confront LHC data. In two years since previous there have been significant advances in both soft and hard QCD, particularly areas of multi-leg NLO calculations, inclusion those calculations into parton shower Monte Carlos, tuning non-perturbative parameters Carlos. These proceedings describe theoretical that taken place, impact early data, for future development.
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.
The goal of this white paper is to give a comprehensive overview the rich field forward physics.We discuss occurrences BFKL re-summation effects in special final states, such as Mueller-Navelet jets, jet-gap-jets, and heavy quarkonium production.It further addresses TMD factorization at low x manifestation semi-hard saturation scale (generalized) PDFs.More theoretical aspects low-x physics, probes quark-gluon plasma, well possibility use photonhadron collisions LHC constrain hadronic...
We define new observables sensitive to BFKL dynamics in the context of multijet production at large hadron collider (LHC). propose study inclusive three jets well separated rapidity from each other, with two them being very forward. show that tagging a third jet central region allows for strong test formalism. In particular, we have studied projections on azimuthal angles differential cross section which allow definition many different whose behavior when varying $p_t$ and is distinct signal...
We evaluate differential cross sections for production of four jets in multi-Regge kinematics at a hadron collider. The main focus lies on azimuthal angle dependences. As previous studies, the ratios correlation functions products cosines differences among tagged offer us cleanest quantities to compare with experimental data. calculations are based jet from single BFKL ladder convolution three Green where we always have two forward/backward final state. also demand tagging further more...
Recently, new observables in LHC inclusive events with three tagged jets were proposed. Here, we extend that proposal to four jets. The are characterized by one jet the forward direction, backward direction a large rapidity distance Y from first and two more central regions of detector. In our setup, non-tagged associated mini-jet multiplicity is present needs be accounted for inclusion BFKL gluon Green functions. projection cross section on azimuthal-angle components opens up opportunity...
We propose the study of new observables in LHC inclusive events with three tagged jets, one forward direction, backward direction and both well-separated rapidity from each other (Mueller-Navelet jets), together a third jet central regions rapidity. Since non-tagged associated mini-jet multiplicity is allowed, we argue that projecting cross sections on azimuthal-angle components can provide several distinct tests BFKL dynamics. Realistic kinematical cuts are introduced.
In the path towards a muon collider with center of mass energy 10 TeV or more, stage at 3 emerges as an appealing option. Reviewing physics potential such is main purpose this document. order to outline progression performances across stages, few sensitivity projections for higher are also presented. There many opportunities probing new collider. Some them in common extensively documented case CLIC stage, and include measuring Higgs trilinear coupling testing possible composite nature boson...
Ratios of azimuthal angle correlations between two jets produced at large rapidity separation are studied in the N=4 super Yang-Mills theory (MSYM). It is shown that these observables, which directly prove SL(2,C) symmetry present gauge theories Regge limit, exhibit an excellent perturbative convergence. They compared to those calculated QCD for different renormalization schemes concluding momentum-substraction (MOM) scheme with Brodsky-Lepage-Mackenzie (BLM) scale-fixing procedure captures...
We determine both real and virtual next-to-leading order corrections to the gluon induced forward jet vertex, from high energy effective action proposed by Lipatov. For these calculations we employ same regularization subtraction formalism developed in our previous work on quark-initiated vertex. find agreement with results literature.
We analyse the singular behaviour of one-loop integrals and scattering amplitudes in framework loop-tree duality approach. show that there is a partial cancellation singularities at loop integrand level among different components corresponding dual representation can be interpreted terms causality. The remaining threshold infrared are restricted to finite region momentum space, which size external momenta mapped phase-space real corrections cancel soft collinear divergences.
Recently, a new family of observables consisting azimuthal-angle generalized ratios was proposed in kinematical setup that resembles the usual Mueller-Navelet jets but with an additional tagged jet central region rapidity. Nontagged minijet activity between three can affect significantly azimuthal angle orientation and is accounted for by introduction two Balitsky-Fadin-Kuraev- Lipatov (BFKL) gluon Green functions. Here, we calculate the, presumably, most relevant higher order corrections to...
We study ratios of azimuthal-angle distributions in Mueller-Navelet jets after imposing a rapidity veto constraint: the minijet radiation activity is restricted to only allow final-state partons separated at least distance $b$. It well-known that asymptotic growth with separation two tagged NLLA BFKL Green's function requires value $b \simeq {\cal O} (2)$ order avoid unphysical cross sections. further investigate this point from phenomenological view and work out those values $b$ which best...
Quantum properties of the state associated to gluon Green’s function in Balitsky-Fadin-Kuraev-Lipatov approach are studied using a discretization virtuality space. Considering coupling constant as imaginary, its density matrix corresponds pure for any energy. Nonlinear corrections due high densities modeled through suppression infrared modes Hamiltonian making it no longer Hermitian. This introduces quantum decoherence into evolution equation. When is real this leads unbounded normalization...