A5037673007- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Advanced Thermodynamics and Statistical Mechanics
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Theoretical and Computational Physics
- Quantum Mechanics and Applications
- Relativity and Gravitational Theory
- Astronomy and Astrophysical Research
- Quantum, superfluid, helium dynamics
- Graphene research and applications
- Particle Detector Development and Performance
- Topological Materials and Phenomena
- Quantum Mechanics and Non-Hermitian Physics
Università di Camerino
2025
University of Basel
2021-2024
Technical University of Munich
2013-2024
Institute for Advanced Study
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2023
University of Groningen
2019-2020
University of Bern
2017-2018
University of Nottingham
2018
University of Perugia
2010-2012
A bstract In order to predict the cosmological abundance of dark matter, an estimation particle rates in expanding thermal environment is needed. For non-relativistic regime sets stage for freeze-out matter energy density. We compute transition widths and annihilation, bound-state formation, dissociation cross sections fermion pairs unifying framework effective field theories at finite temperature, with bath modeling thermodynamical behaviour early universe. reproduce extend some known...
A bstract Recently many investigations have considered Majorana dark matter co-annihilating with bound states formed by a strongly interacting scalar field. However only the gluon radiation contribution to state formation and dissociation, which at high temperatures is subleading soft 2 → scatterings, has been included. Making use of non-relativistic effective theory framework solving plasma-modified Schrödinger equation, we address effect scatterings as well thermal dissociation states. We...
We apply a formalism accounting for thermal effects (such as modified Sommerfeld effect; Salpeter correction; decohering scatterings; dissociation of bound states), to one the simplest WIMP-like dark matter models, associated with an “inert” Higgs doublet. A broad temperature range T ∼ M/20 . M/104 is considered, stressing importance and less-understood nature late annihilation stages. Even though only weak interactions play role, we find that resummed real virtual corrections increase...
In many realizations of leptogenesis, heavy right-handed neutrinos play the main role in generation an imbalance between matter and antimatter early Universe. Hence, it is relevant to address quantitatively their dynamics a hot dense environment by taking into account various thermal aspects problem at hand. The strong washout regime offers interesting framework carry out calculations systematically reduce theoretical uncertainties. Indeed, any matter–antimatter asymmetry generated when...
A bstract We investigate the phenomenology of a simplified model with Majorana fermion as dark matter candidate which interacts Standard Model quarks via colourcharged coannihilation partner. Recently it has been realized that non-perturbative dynamics, including Sommerfeld effect, bound state formation/dissociation and thermal corrections, play an important role in coannihilations coloured mediators. This calls for careful analysis freeze-out new look at experimental signatures expected...
A bstract We analyse the phenomenology of a simplified model for real scalar dark matter candidate interacting with quarks via coloured fermionic mediator. In coannihilation regime, abundance is controlled by dynamics fermions which can be significantly affected non-perturbative effects. employ non-relativistic effective field theory approach allows us to systematically treat Sommerfeld effect and bound-state formation in early Universe. The parameter space compatible relic confronted...
A bstract Indirect detection is one of the most powerful methods to search for annihilating dark matter. In this work, we investigate impact non-perturbative effects in indirect For purpose utilize a minimal model consisting fermionic matter candidate TeV mass range that interacts via scalar- and pseudo-scalar interactions with massive scalar mediator mixing Higgs. The interaction induces an attractive Yukawa potential between particles, such annihilations are Sommerfeld enhanced, bound...
A bstract For non-relativistic thermal dark matter, close-to-threshold effects largely dominate the evolution of number density for most times after freeze-out, and hence affect cosmological relic density. precise evaluation relevant interaction rates in a medium representing early universe includes accounting relative motion matter particles medium. We consider model fermions interacting with plasma gauge bosons, which is equivalent to QED. The temperature taken be smaller than fermion mass...
We consider the production at LHC of exotic composite leptons charge $Q=+2e$. Such states are allowed in models that contain extended isospin multiplets (${I}_{W}=1$ and ${I}_{W}=3/2$). These doubly charged couple with standard model (SM) fermions via gauge interactions, thereby delineating restricting their possible decay channels. discuss cross section ${L}^{++}(pp\ensuremath{\rightarrow}{L}^{++},{\ensuremath{\ell}}^{\ensuremath{-}})$ concentrate on leptonic signature deriving from cascade...
In some scenarios for the early universe, non-relativistic thermal dark matter chemically decouples from environment once temperature drops below Hubble rate. The value at which energy density freezes out depends on underlying model. a simple setting, we provide comprehensive study of heavy fermionic interacting with light degrees freedom sector whose $T$ decreases an initial close to freeze-out temperature. Different temperatures imply different hierarchies scales. By exploiting methods...
A bstract In some scenarios for the early universe, non-relativistic thermal dark matter chemically decouples from environment once temperature drops well below mass. The value at which energy density freezes out depends on underlying model. a simple setting, we provide comprehensive study of heavy fermionic interacting with light degrees freedom sector whose T decreases an initial close to freeze-out temperature. Different temperatures imply different hierarchies scales. By exploiting...
We study the one-dimensional Dirac equation in framework of a position dependent mass under action Woods-Saxon external potential. find that constraining appropriately function it is possible to obtain solution problem terms hypergeometric function. The for which this turns out be continuous. In particular we scattering and derive exact expressions reflection transmission coefficients are compared those constant case. For very same bound state also solved, providing transcendental energy...
In this paper we study the impact of a scalar exchange on dark matter relic abundance by solving plasma-modified Schroedinger equation. A simplified model is considered where Majorana fermion embedded in U(1)$'$ extension Standard Model and couples with Higgs via Yukawa interaction. We find that dark-Higgs can increase overclosure bounds significantly. For largest (smallest) value coupling examined work, mass lifted from 5 TeV (0.55 TeV) to 27 (0.70 TeV).
Dark matter models with light mediators featuring sizable interactions among dark particles enjoy an increasing attention in the model building community due to elegance which they can potentially explain scaling relations governing galactic halos and clusters of galaxies. In present work we continue our study such using non-relativistic potential effective field theories (NREFTs pNREFTs) explore properties a Yukawa-type scalar pseudoscalar between low-energetic mediator heavy fermions....
In a model where Majorana neutrinos heavier than the electroweak scale couple to Standard Model Higgs bosons and leptons, we compute systematically thermal corrections direct indirect CP asymmetries in neutrino decays. These are key ingredients entering equations that describe thermodynamic evolution of induced lepton-number asymmetry eventually leading baryon universe. We an effective field theory framework assumes temperature smaller masses larger scale, provide expansion over mass. this...
Abstract Beyond the Standard Model physics is required to explain both dark matter and baryon asymmetry of universe, latter possibly generated during a strong first-order electroweak phase transition. While many proposed models tackle these problems independently, it interesting inquire whether same model can both. In this context, we link state-of-the-art perturbative assessments transition thermodynamics with extraction energy density. These techniques are applied next-to-minimal...
Doubly charged excited leptons give rise to interesting signatures for physics beyond the standard model at present Large Hadron Collider. These exotic states are introduced in extended isospin multiplets which couple ordinary and quarks either with gauge or contact effective interactions a combination of both. In this paper we study production corresponding doubly forthcoming linear colliders focus on electron-electron beam setting. framework interactions, interference between $t$ $u$...
Abstract When dark matter particles only feebly interact with plasma constituents in the early universe, they never reach thermal equilibrium. As opposed to freeze-out mechanism, where abundance is determined at T ≪ M, energy density of a interacting state builds up and increases over ≳ M. In this work, we address impact high-temperature regime on production rate, Standard Model are ultra-relativistic nearly light-like. setting, multiple soft scatterings, as well 2 → processes, found give...
A bstract Yukawa-type interactions between heavy Dirac fermions and a scalar field are common ingredient in various extensions of the Standard Model. Despite that, non-relativistic limit Yukawa theory has not yet been studied full generality rigorous model-independent way. In this paper we intend to fill gap by initiating series investigations that make use modern effective (EFT) techniques. particular, aim at constructing suitable potential EFTs (denoted as NRY pNRY respectively) close...
We consider the simplest realization of leptogenesis with one heavy Majorana neutrino species much lighter than other ones. In this scenario, when temperature early universe is smaller lightest mass, we compute at first order in Standard Model couplings and, for each coupling, leading termperature CP asymmetry decays into leptons and anti-leptons. perform calculation using a hierarchy two effective field theories organized as expansions inverse heavy-neutrino masses. ultimate theory, thermal...
In this work, we consider a class of dark matter (DM) models where the DM does not directly interact with Standard Model (SM) particles at tree-level. Therefore, coannihilation mechanism is crucial in achieving correct relic abundance, which turn requires coannihilating partner to be close mass actual particle. our systematisation models' class, mediator and are assumed charged under QCD interactions. This last feature calls for scrutiny non-perturbative effects, namely Sommerfeld factors...
In this paper we present the partial wave unitarity bound in parameter space of dimension-5 and dimension-6 effective operators that arise a compositeness scenario. These are routinely used experimental searches at LHC to constraint contact gauge interactions between ordinary Standard Model fermions excited (composite) states mass M. After deducing for production process composite neutrino, implement such compare it with recent exclusion curves Run 2, High-Luminosity High-Energy...