A5020765199- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Noncommutative and Quantum Gravity Theories
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Advanced Topics in Algebra
- Physics of Superconductivity and Magnetism
- Galaxies: Formation, Evolution, Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and Classical Electrodynamics
- Numerical methods for differential equations
- Quantum chaos and dynamical systems
- Quantum Mechanics and Applications
- International Science and Diplomacy
- Fractal and DNA sequence analysis
University of Manchester
2015-2024
Manchester University
2002-2024
European Organization for Nuclear Research
1999-2023
Chinese Academy of Sciences
2022
Durham University
2022
Michigan State University
2022
Institute of Theoretical Physics
2022
University of Pisa
2022
Johannes Gutenberg University Mainz
1991-2017
Technical University of Munich
2016
We analyze the scenario of baryogenesis through leptogenesis induced by out-of-equilibrium decays heavy Majorana neutrinos and pay special attention to CP violation. Extending a recently proposed resummation formalism for two-fermion mixing decay amplitudes, we calculate resonant phenomenon violation due two nearly degenerate neutrinos. Solving numerically relevant Boltzmann equations, find that isosinglet mass may range from 1 TeV up grand unification scale, depending on mechanism and/or...
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
This paper is a review of the present status neutrino mass physics, which grew out an APS sponsored study neutrinos in 2004. After discussion knowledge masses and mixing some popular ways to probe new physics implied by recent data, it summarizes what can be learned about interactions as well nature beyond Standard Model from various proposed experiments. The intriguing possibility that may at heart our understanding long standing puzzle cosmology, i.e. origin matter–antimatter asymmetry...
We study minimal scenarios of resonant leptogenesis near the electroweak phase transition. These models offer a number testable phenomenological signatures for low-energy experiments and future high-energy colliders. Our extends previous analyses relevant network Boltzmann equations, consistently taking into account effects from out equilibrium sphalerons single lepton flavours. show that flavours become very important in variants leptogenesis, where observed baryon asymmetry Universe is...
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, particle physics in each case viewed both theoretical experimental/observational perspectives. After reviewing the role active neutrinos physics, we focus on context Matter puzzle. Here, first motivation for based challenges tensions purely cold scenarios. then round out discussion by critically summarizing known...
This Report summarizes the results of first 10 months' activities LHC Higgs Cross Sections Working Group. The main goal working group was to present status-of-art on Physics at integrating all new that have appeared in last few years. is more than a mere collection proceedings general meetings. subgroups been different directions. An attempt has made from these complete and homogeneous form. subgroups' contributions correspondingly comprise parts Report. A significant amount work performed...
We review the collider phenomenology of neutrino physics and synergetic aspects at energy, intensity cosmic frontiers to test new behind mass mechanism. In particular, we focus on seesaw models within minimal setup as well with extended gauge and/or Higgs sectors, supersymmetric mechanism R-parity violation. simplest type-I scenario sterile neutrinos, summarize update current experimental constraints its mixing active neutrinos. also discuss future prospects testing colliders in related...
We calculate a new type of two-loop contribution to the electric dipole moments electron and neutron in supersymmetric theories. The contributions are originated from potential $\mathrm{CP}$ violation trilinear couplings Higgs bosons scalar-top or scalar-bottom quarks. These did not receive stringent constraints directly. induced through mechanism analogous that due Barr Zee [Phys. Rev. Lett. 65, 21 (1990)]. find observable effects for sizable portion parameter space related third generation...
We consider an Abelian model with a $\mathrm{CP}$-conserving Higgs potential spanned by two complex fields. The $\mathrm{CP}$ invariance of the is then broken explicitly beyond Born approximation introducing soft-$\mathrm{CP}$-violating Yukawa interactions. Based on non-renormalization theorem, we derive consistency conditions under which $\mathrm{CP}$-odd counterterm exists and, at same time, renders one-loop-induced mixing $\mathrm{CP}$-even boson scalar ultra-violet finite. novel tadpole...
We study a minimal one-loop radiative mechanism for generating small Majorana neutrino masses in inverse seesaw extensions of the Standard Model with two singlet fermions per family. The new feature this is that induced left-handed mass matrix directly proportional to right-handed neutrinos. This very economical scenario without necessitating existence nonstandard scalar or gauge fields.
We present a fully flavour-covariant formalism for transport phenomena, by deriving Markovian master equations that describe the time-evolution of particle number densities in statistical ensemble with arbitrary flavour content. As an application this general formalism, we study effects scenario resonant leptogenesis (RL) and obtain evolution heavy-neutrino lepton densities. This provides complete unified description RL, capturing three distinct physical phenomena: (i) mixing between states,...
We study the Higgs mass spectrum as predicted by a Maximally Symmetric Two Doublet Model (MS-2HDM) potential based on SO(5) group, softly broken bilinear terms. show that lightest sector resulting from this MS-2HDM becomes naturally aligned with of Standard (SM), independently charged boson and $\tan \beta$. In context Type-II 2HDM, is simplest three possible symmetry realizations scalar can lead to SM alignment. Nevertheless, renormalization group effects due hypercharge gauge coupling $g'$...
Recently, the LHC collaborations, ATLAS and CMS, have announced an excess in diphoton channel with local significance of about $3\ensuremath{\sigma}$ around invariant mass distribution $\ensuremath{\sim}750\text{ }\text{ }\mathrm{GeV}$, after analyzing new data collected at center-of-mass energies $\sqrt{s}=13\text{ }\mathrm{TeV}$. We present a possible physical interpretation such signature, within framework minimal UV-complete model massive singlet pseudoscalar state $a$ that couples to...
We study a new production mechanism for heavy neutrinos at the LHC, which dominates over usually considered $s$-channel $W$-exchange diagram heavy-neutrino masses larger than 100 - 200 GeV. The is infrared-enhanced by $t$-channel $W\gamma$-fusion processes. This has important implications experimental tests of seesaw neutrino masses, and in particular, ongoing searches LHC. find that direct collider limits on light-to-heavy mixing can be significantly improved, when this channel properly...