A5079882825- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Radio Astronomy Observations and Technology
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Superconducting and THz Device Technology
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
- advanced mathematical theories
- Solar Radiation and Photovoltaics
Washington University in St. Louis
2019-2025
Fermi National Accelerator Laboratory
2019-2023
University of Virginia
2023
Oklahoma State University
2023
Max Planck Institute for Nuclear Physics
2016-2022
University of Washington
2019
University of Maryland, College Park
2009-2019
University of Manchester
2012-2017
Max Planck Society
2017
Technical University of Munich
2015-2017
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...
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...
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 examine the theoretical motivations for long-lived particle (LLP) signals at LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are common prediction wide range theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, represent natural generic possibility physics beyond SM (BSM). In most cases LLP lifetime can be treated free parameter from $\mu$m scale up to Big Bang Nucleosynthesis limit $\sim 10^7$m....
Recently, several $B$-physics experiments have reported an appreciable deviation from the Standard Model (SM) in tree-level observables $R_{D^{(*)}}$; combined weighted average now stands at $\approx 4 \sigma$. We first show anomaly necessarily implies model-independent collider signals of form $pp \to b \tau \nu$ that should be expediously searched for ATLAS/CMS as a complementary test anomaly. Next we suggest possible interconnection with radiative stability Higgs boson and point to...
A bstract We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect from both lepton number conserving violating processes, as sensitive probe extent violation possible interference effects in sector. introduce phenomenological parametrisation simplified one-generation seesaw model with one active two neutrino states terms experimentally measurable quantities, such active-sterile mixing angles, CP phases, masses...
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...
We show that a TeV scale inverse seesaw model for neutrino masses can be realized within the framework of supersymmetric $SO(10)$ consistent with gauge coupling unification and observed mixing. present our expectations nonunitarity effects in leptonic mixing matrix, some which are observable at future factories as well next generation searches lepton flavor violating processes such $\ensuremath{\mu}\ensuremath{\rightarrow}e+\ensuremath{\gamma}$. The has ${W}_{R}$ ${Z}^{\ensuremath{'}}$...
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 $g'$...
We discuss a minimal solution to the long-standing $(g-2)_\mu$ anomaly in simple extension of Standard Model with an extra $Z'$ vector boson that has only flavor off-diagonal couplings second and third generation leptons, i.e. $\mu, \tau, \nu_\mu, \nu_\tau$ their antiparticles. A simplified model realization, as well various collider low-energy constraints on this model, are discussed. find $(g-2)_\mu$-favored region for lighter than tau lepton is totally excluded, while heavier still...
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...
Seesaw models with a small lepton number breaking can naturally accommodate electroweak-scale pseudo-Dirac neutrinos sizable mixing the active neutrinos, while satisfying light neutrino oscillation data. Due to smallness of parameter, 'smoking gun' collider signature same-sign dileptons is suppressed, and heavy in these would manifest at LHC dominantly through conserving trilepton final states. Using recent CMS results for anomalous production multilepton events s=8TeV an integrated...
We present a TeV-scale left-right ultraviolet completion of type-I seesaw for neutrino masses based on the $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ gauge group without parity, which leads to "large" light-heavy mixing while keeping small in natural manner guaranteed by discrete symmetries. point out specific observable implications this class models if $SU(2)_R$-breaking scale is order 5 TeV, searches lepton flavor violating processes such as $\mu\to e\gamma$, 3 e$ and $\mu-e$ conversion...
Models of radiative Majorana neutrino masses require new scalars and/or fermions to induce lepton number violating interactions. We show that these particles also generate observable nonstandard interactions (NSI) with matter. classify models as type-I or II, containing at least one Standard Model (SM) particle inside the loop diagram generating mass, and type-II having no SM loop. While do not tree-level NSI, popular which fall under category are shown, somewhat surprisingly, NSI...
We derive bounds on the Dirac Yukawa couplings of neutrinos in seesaw models using recent Large Hadron Collider (LHC) data Higgs decays for case where Standard Model singlet heavy leptons needed mechanism have masses 100 GeV range. Such scenarios with large are natural inverse since small neutrino mass owes its origin to a Majorana new set fermions. Yukawas sub-TeV right-handed also possible certain textures Type-I models, so that above apply them. find current from LHC can put both...
This report summarises the physics opportunities in search and study of beyond Standard Model at a 100 TeV pp collider.
We show that the excess events observed in a number of recent LHC resonance searches can be simultaneously explained within nonsupersymmetric left-right inverse seesaw model for neutrino masses with W_{R} mass around 1.9 TeV. The minimal particle content leads to gauge coupling unification this predicts g_{R}≃0.51 at TeV scale, which is consistent data. extra color singlet, SU(2)-triplet fermions required interpreted as dark matter Universe. Future measurements ratio same-sign opposite-sign...
We discuss the future prospects of heavy neutrino searches at next generation lepton colliders. In particular, we focus on planned electron-positron colliders, operating in two different beam modes, namely, $e^+e^-$ and $e^-e^-$. mode, consider various production decay modes ($N$), find that final state with $e+2j+{E\!\!\!/}_T$, arising from $e^+e^-\to N\nu$ is most promising channel. However, since this mode insensitive to Majorana nature neutrinos, also study a new channel Ne^\pm W^\mp$,...
We show that if the new physics beyond standard model is associated with a first-order phase transition around ${10}^{7}--{10}^{8}\text{ }\text{ }\mathrm{GeV}$, energy density stored in resulting stochastic gravitational waves and corresponding peak frequency are within projected final sensitivity of advanced LIGO/VIRGO detectors. discuss some possible scenarios could arise at such energies, particular, consequences for Peccei-Quinn supersymmetry breaking scales.
In a recent paper, minimal supersymmetric (SUSY) SO(10)xS_4 based unified model of flavor for quarks and leptons was proposed with two 10 one 126 contributing to fermion masses. An important aspect this is that Yukawa couplings emerge dynamically from minimization the flavon potential, thereby reducing number parameters considerably. We make detailed numerical analysis mixings including SUSY threshold effects at TeV scale type-I corrections type-II dominant seesaw neutrino This single-step...
We present a possible interpretation of the recent diphoton excess reported by early $$ \sqrt{s}=13 TeV LHC data in quark seesaw left-right models with vectorlike fermions proposed to solve strong CP problem without axion. The gauge singlet real scalar field responsible for mass has right production cross section and branching ratio be identifiable at around 750 GeV invariant mass. Various ways test this hypothesis as more accumulates are proposed.
We show that in TeV scale left-right (L-R) symmetric seesaw models, there are new dominant contributions to the collider signals of heavy Majorana neutrinos arising from heavy-light neutrino mixing, which directly probe matrix a certain class models. propose way distinguish this contribution widely discussed one only probes nature right-handed neutrinos, by analyzing some simple kinematical variables. find L-R models existing LHC data already yield slightly stronger constraints on mixing...