Frank F. Deppisch
A5090248610- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- International Science and Diplomacy
- Radioactive Decay and Measurement Techniques
- Scientific Research and Discoveries
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Radio Astronomy Observations and Technology
- Noncommutative and Quantum Gravity Theories
- Chemical Reactions and Isotopes
- Radiation Therapy and Dosimetry
- Scientific Measurement and Uncertainty Evaluation
- Algorithms and Data Compression
University College London
2015-2024
Technical University of Munich
2021-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2022
University of Trieste
2022
Nawi Graz
2022
University of Graz
2022
Institute of High Energy Physics
2019
Austrian Academy of Sciences
2019
Sorbonne Université
2016
UPMC Health System
2016
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...
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...
Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at weak scale. When produced experiments such as Large Hadron Collider (LHC) CERN, these long-lived (LLPs) decay far from interaction vertex of primary proton-proton collision. Such LLP signatures distinct those promptly decaying targeted by majority searches for new physics LHC, often requiring customized techniques identify, example, significantly displaced vertices, tracks with...
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...
Abstract The existence of nonzero neutrino masses points to the likely multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, referred as leptons (HNLs). In this white paper, we discuss present experimental status HNLs including colliders, beta decay, accelerators, well astrophysical and cosmological impacts. We importance continuing search for HNLs, its potential impact on our understanding key fundamental questions,...
We discuss a supersymmetric inverse seesaw model in which lepton flavor violating decays can be enhanced either by slepton contributions or the nonunitarity of charged current mixing matrix. As an example we calculate $Br(\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma})$ taking into account both heavy exchange as well diagrams minimal supergravity framework. find that for same neutrino parameters rate with respect to expectations, without supersymmetry.
The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability study different isotopes track outgoing electrons provides means discriminate underlying mechanisms for by measuring half-life electron angular energy distributions.
We discuss lepton flavor violating processes induced in the production and decay of heavy right-handed neutrinos at LHC. Such particles appear left-right symmetrical extensions standard model as messengers neutrino mass generation, can have masses TeV scale. determine expected sensitivity on mixing matrix, well gauge boson masses. By comparing LHC with that searches for low energy processes, we identify favorable areas parameter space to explore complementarity between high energies.
Neutrinoless double beta decay is the most powerful tool to probe not only for Majorana neutrino masses but lepton number violating physics in general. We discuss relations between violation, and mass, review a general Lorentz invariant parametrization of rate, highlight different new models showing how mechanisms can trigger decay, finally possibilities discriminate test these complementary experiments.
Neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) is a crucial test for lepton number violation. Observation of this process would have fundamental implications neutrino physics, theories beyond the Standard Model and cosmology. Focusing on so-called short-range operators $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ their potential interplay with standard light Majorana exchange, we present first complete calculation relevant nuclear matrix...
Abstract Kaon physics is at a turning point – while the rare-kaon experiments NA62 and KOTO are in full swing, end of their lifetime approaching future experimental landscape needs to be defined. With HIKE, KOTO-II LHCb-Phase-II on table under scrutiny, it very good moment time take stock contemplate about opportunities these theoretical developments provide for particle coming decade beyond. This paper provides compact summary talks discussions from Kaons@CERN 2023 workshop, held September CERN.
We study the impact of minimal non-supersymmetric models resonant leptogenesis on charged lepton flavour violation and neutrino mixing angle theta(13). Possible low-scale realisations tau-, mu- e-leptogenesis provide very distinct predictive frameworks to explain observed baryon asymmetry in Universe by sphaleron conversion an individual e-lepton-number which gets resonantly enhanced via out-of-equilibrium decays nearly degenerate heavy Majorana neutrinos. Based approximate symmetries, we...
Measuring a nonzero value for the cross section of any lepton number violating (LNV) process would put strong lower limit on washout factor effective density in early Universe at times close to electroweak phase transition and thus lead important constraints high-scale model generation observed baryon asymmetry based LNV. In particular, leptogenesis (LG) models with masses right-handed neutrinos heavier than mass scale LHC, implied large factors violation out-of-equilibrium condition...
We point out that the recent excess observed in searches for a right-handed gauge boson W_R at CMS can be explained left-right symmetric model with D parity violation. In class of SO(10) models, which is broken high scale, symmetry breaking scale naturally small, and few TeV coupling constants satisfy g_R ~ 0.6 g_L. Such models therefore predict charged range suppressed as compared to usually assumed manifest case = The data show events are consistent cross section predicted 1.9 < M_{W_R}...
We propose a class of left-right symmetric models (LRSMs) with spontaneous D parity breaking, where SU(2)_R breaks at the TeV scale while discrete symmetry around 10^9 GeV. By embedding this framework in non-supersymmetric SO(10) Grand Unified Theory (GUT) Pati-Salam as highest intermediate breaking step, we obtain g_R / g_L ~ 0.6 between right- and left-handed gauge couplings scale. This leads to suppression beyond Standard Model phenomena induced by right-handed coupling. Here focus...
We interpret the 2 TeV excesses at LHC in a left-right symmetric model with Higgs doublets and spontaneous $D$-parity violation. The light neutrino masses are understood via linear seesaw, suppressed by high breaking scale, heavy neutrinos have pseudo-Dirac character. In addition, right-handed gauge coupling ${g}_{R}/{g}_{L}\ensuremath{\approx}0.6$ an $SO(10)$ embedding, we can thereby observed $eejj$ excess CMS. show that it be reconciled diboson dijet within simplified scenario based on...
We investigate the pair production of right-handed neutrinos from decay an additional neutral $Z^{\prime}$ boson in gauged $B-L$ model. Taking into account current constraints on mass and associated gauge coupling $g_{1}^{\prime}$, we analyse sensitivity proposed experiments at lifetime frontier, FASER 2, CODEX-b, MATHUSLA as well a hypothetical version MAPP detector to long lived heavy neutrino $N$ originating decays $Z^{\prime}$. further complement this study with determining reach LHCb...
We discuss the impact of observation neutrinoless double beta decay on washout lepton number in early universe. Neutrinoless can be triggered by a large mechanisms that encoded terms standard model effective operators which violate two units. calculate contribution such to rate and correlate it with induced same find nonstandard decay, i.e., not mass mechanism light neutrino exchange, would correspond an efficient above electroweak scale for many up dimension 11. Combined sphaleron...
Searches for rare processes such as $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$ put stringent limits on lepton flavor violation expected in many beyond-the-Standard-Model physics scenarios. This usually precludes the observation of at high energy colliders LHC. We here discuss a scenario where right-handed neutrinos are produced via ${Z}^{\ensuremath{'}}$ portal but which can only decay small violating couplings. Consequently, process rate is unsuppressed by couplings and...
Interactions that manifest themselves as lepton number violating processes at low energies in combination with sphaleron transitions typically erase any preexisting baryon asymmetry of the Universe. In this article, we discuss constraints obtained from an observation neutrinoless double beta decay context. If a new physics mechanism other than standard light neutrino exchange is observed, typical scenarios high-scale baryogenesis will be excluded unless stabilized via some mechanism. We also...