A5021104349- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- International Science and Diplomacy
- Radio Astronomy Observations and Technology
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Radiation Therapy and Dosimetry
- Stochastic processes and financial applications
- Noncommutative and Quantum Gravity Theories
National Institute of Chemical Physics and Biophysics
2016-2025
Institute of High Energy Physics
2015-2024
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
University of Helsinki
1993-2023
European Organization for Nuclear Research
2002-2021
California Institute of Technology
2019-2021
Université Paris-Saclay
2017-2021
Institut de Recherche sur les Lois Fondamentales de l'Univers
2017-2021
CEA Paris-Saclay
2017-2021
We provide ingredients and recipes for computing signals of TeV-scale Dark Matter annihilations decays in the Galaxy beyond. For each DM channel, we present energy spectra at production, computed by high-statistics simulations. estimate Monte Carlo uncertainty comparing results yielded Pythia Herwig event generators. then propagation functions charged particles Galaxy, several distribution profiles sets parameters. Propagation e ± is performed with an improved semi-analytic method that takes...
We revisit the cosmological and astrophysical constraints on fraction of dark matter in primordial black holes (PBHs) with an extended mass function. consider a variety functions, all which are described by three parameters: characteristic width fraction. Various observations then impose as function first two parameters. show how these relate to those for monochromatic function, demonstrating that they usually become more stringent case than one. Considering only well-established bounds,...
We study the production of primordial black hole (PBH) binaries and resulting merger rate, accounting for an extended PBH mass function possibility a clustered spatial distribution. Under hypothesis that gravitational wave events observed by LIGO were caused mergers, we show it is possible to satisfy all present constraints on abundance, find viable parameter range lognormal function. The non-observation background allows us derive fraction dark matter in PBHs, which are stronger than any...
The abundance of primordial black holes (PBHs) in the mass range $0.1 - 10^3 M_\odot$ can potentially be tested by gravitational wave observations due to large merger rate PBH binaries formed early universe. To put estimates latter on a firmer footing, we first derive analytical for general functions while imposing minimal initial comoving distance between binary and nearest it, order pick only configurations where would not get disrupted. We then study formation evolution before...
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
We perform a state-of-the-art global fit to all Higgs data. synthesise them into 'universal' form, which allows easily test any desired model. apply the proposed methodology extract from data branching ratios, production cross sections, couplings and analyse composite models, models with extra doublets, supersymmetry, particles in loops, anomalous top couplings, invisible decays Dark Matter. Best regions lie around Standard Model predictions are well approximated by our fit. Latest exclude...
We analyse the LIGO-Virgo data, including recently released GWTC-2 dataset, to test a hypothesis that data contains more than one population of black holes. perform maximum likelihood analysis astrophysical holes with truncated power-law mass function whose merger rate follows from star formation rate, and primordial for which we consider log-normal critical collapse functions. find alone are strongly disfavoured by while best fit is obtained template combining rates. Alternatively, may hint...
The most conservative interpretation of the nHz stochastic gravitational wave background (SGWB) discovered by NANOGrav and other pulsar timing array (PTA) collaborations is astrophysical, namely that it originates from supermassive black hole (SMBH) binaries. However, alternative cosmological models have been proposed, including cosmic strings, phase transitions, domain walls, primordial fluctuations, ``audible'' axions. We perform a multimodel analysis (MMA) to compare how well these...
The James Webb Space Telescope has detected surprisingly luminous early galaxies that indicate a tension with the $\mathrm{\ensuremath{\Lambda}}$ cold dark matter. Motivated by scenarios including axion miniclusters or primordial black holes, we consider power-law modifications of matter power spectrum. We show could be resolved if consists $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}\text{ }\text{ }\mathrm{eV}$ axions fraction ${f}_{\mathrm{PBH}}>0.005$ is composed compact...
If the generating mechanism for neutrino mass is to account both newly observed muon anomalous magnetic moment as well present experimental bounds on lepton flavor nonconservation, then matrix should be almost degenerate and underlying physics observable at future colliders. We illustrate this assertion with two specific examples, show that gamma(mu;-->egamma)/m5(mu), gamma(tau-->egamma)/m5tau, gamma(tau-->(mu)gamma)/m5tau are in ratio ((Delta)m2)2sol/2, ((Delta)m2)2atm, respectively, where...
We present a new parametrization of the minimal seesaw model, expressing heavy-singlet neutrino Dirac Yukawa couplings ${(Y}_{\ensuremath{\nu}}{)}_{\mathrm{ij}}$ and Majorana masses ${M}_{{N}_{i}}$ in terms effective light-neutrino observables an auxiliary Hermitian matrix H. In supersymmetric version latter can be related directly to other low-energy observables, including processes that violate charged lepton flavor $\mathrm{CP}.$ This enables one respect stringent constraints on...
We argue that there exists a simple relation between the quark and lepton mixings, which supports idea of grand unification probes underlying robust bimaximal fermion mixing structure still unknown flavor physics. In this framework matrix is parameter describing deviation neutrino from exactly bimaximal, predicting theta(sol)+theta(C)=pi/4, where theta(C) Cabibbo angle, theta(atm)+theta(CKM)(23)=pi/4 theta(MNS)(13) approximately theta(CKM)(13) O(lambda(3)), in perfect agreement with...
We study the standard model (SM) in its full perturbative validity range between ${\mathrm{\ensuremath{\Lambda}}}_{\mathrm{QCD}}$ and $U{(1)}_{Y}$ Landau pole, assuming that a yet unknown gravitational theory UV does not introduce additional particle thresholds, as suggested by tiny cosmological constant absence of new stabilizing physics at electroweak scale. find that, due to dimensional transmutation, SM Higgs potential has global minimum ${10}^{26}\text{ }\text{ }\mathrm{GeV}$,...
The recently discovered resonance at 125 GeV has properties remarkably close to those of the Standard Model Higgs boson. We perform model-independent fits all presently available data. non- standard best-fits found in our previous analyses remain favored with respect SM fit, mainly but not only because {\gamma}{\gamma} rate remains above prediction.
We present a simple texture that predicts the cotangent of solar neutrino mixing angle to be equal golden ratio. This prediction is $1.4\ensuremath{\sigma}$ below best-fit value and final SNO KamLAND data could discriminate it from tri-bimaximal mixing. The mass matrix invariant under ${Z}_{2}\ensuremath{\bigotimes}{\mathrm{Z}}_{2}^{\ensuremath{'}}$ symmetry: geometrically reflection along diagonal rectangle. Assuming an analogous structure in quark sector suggests for Cabibbo angle,...
Theories where the Planck scale is dynamically generated from dimensionless interactions provide predictive inflationary potentials and super-Planckian field variations. We first study minimal single realisation in low-energy effective theory limit, finding predictions n s ≈ 0.96 for spectral index r 0.13 tensor-to-scalar ratio, which can be reduced down to 0.04 presence of large couplings. Next we consider agravity as a quantum gravity multifield inflation that converges towards an...
We scrutinise the evidences recently reported by ATLAS and CMS collaborations for compatible 750 GeV resonances which appear in di-photon channels of two experiments both 8 TeV 13 datasets. Similar di-boson, di-lepton, di-jet $t\bar t$ final states are instead not detected. After discussing properties compatibility signals, we study implications on physics beyond Standard Model with particular emphasis possible scalar extensions theory such as singlet Higgs doublet models. also analyse...