A5022178581- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Noncommutative and Quantum Gravity Theories
- Astrophysics and Cosmic Phenomena
- Advanced Topics in Algebra
- CCD and CMOS Imaging Sensors
- Radioactive Decay and Measurement Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Astrophysical Phenomena and Observations
- Nonlinear Waves and Solitons
- Quantum chaos and dynamical systems
- Scientific Research and Discoveries
- Advanced Algebra and Geometry
- Radiation Detection and Scintillator Technologies
- Spectral Theory in Mathematical Physics
- Quantum and Classical Electrodynamics
- Physics of Superconductivity and Magnetism
University of Victoria
2015-2024
Bühlmann (Switzerland)
2018
Perimeter Institute
2016
University of California, San Diego
2016
Austrian Academy of Sciences
2016
Institute of High Energy Physics
2016
California Institute of Technology
2016
European Organization for Nuclear Research
2004-2006
University of Cambridge
2000-2004
Twin Cities Orthopedics
1999-2001
We consider a generic mechanism via which thermal relic WIMP dark matter may be decoupled from the Standard Model, namely through combination of annihilation to metastable mediators with subsequent delayed decay Model states. illustrate this explicit examples WIMPs connected by bosons or fermions. In all models, provided mass is greater than that mediator, it can secluded an extremely small elastic scattering cross-section on nuclei and rate for direct collider production. contrast, indirect...
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 analyze the indirect astrophysical signatures of secluded models WIMP dark matter, characterized by a weak-scale rate for annihilation into light MeV-scale mediators which are metastable to decay Standard Model states. Such scenarios allow significant enhancement cross section in galactic halo relative its value at freeze-out, particularly when mediator is enough this process proceed through radiative capture `WIMP-onium' bound state. For vector charged under hidden U(1)' gauge group,...
We discuss the sensitivity of neutrino experiments at luminosity frontier to generic hidden sectors containing new (sub)-GeV neutral states. The weak interaction these states with standard model can be efficiently probed through all allowed renormalizable ``portals'' (in Higgs, vector, and sectors) fixed target proton beam facilities, complementary colliders. concentrate on kinetic-mixing vector portal, show that certain regions parameter space for a $\mathrm{U}(1{)}_{S}$ gauge sector...
We consider models of light superweakly interacting cold dark matter, with $\mathcal{O}(10--100)\text{ }\text{ }\mathrm{keV}$ mass, focusing on bosonic candidates such as pseudoscalars and vectors. analyze the cosmological abundance, $\ensuremath{\gamma}$ background created by particle decays, impact stellar processes due to cooling, direct-detection capabilities in order identify classes that pass all constraints. In certain models, variants photoelectric (or axioelectric) absorption matter...
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 present a generating functional which describes the equilibrium thermodynamic response of relativistic system to external sources. A variational principle gives rise constraints on parameters hydrodynamics without making use an entropy current. Our method reproduces and extends results available in literature. It also provides technique for efficiently computing $n$-point zero-frequency correlation functions within hydrodynamic derivative expansion need explicitly solve equations hydrodynamics.
A secluded $\mathrm{U}(1{)}_{S}$ gauge field, kinetically mixed with standard model hypercharge, provides a ``portal'' mediating interactions hidden sector at the renormalizable level, as recently exploited in context of weakly interacting massive particle dark matter. The symmetry-breaking scale may naturally be suppressed relative to weak scale, and so this is efficiently probed by medium-energy ${e}^{+}{e}^{\ensuremath{-}}$ colliders. We study collider signatures minimal model, focusing...
Dark matter detectors built primarily to probe elastic scattering of WIMPs on nuclei are also precise probes light, weakly coupled, particles that may be absorbed by the detector material. In this paper, we derive constraints minimal model dark comprised long-lived vector states V (dark photons) in 0.01–100keV mass range. The absence an ionization signal direct detection experiments such as XENON10 and XENON100 places a very strong constraint photon mixing angle, down O(10−15), assuming...
The Forward Physics Facility (FPF) is a proposal to create cavern with the space and infrastructure support suite of far-forward experiments at Large Hadron Collider during High Luminosity era. Located along beam collision axis shielded from interaction point by least 100 m concrete rock, FPF will house that detect particles outside acceptance existing large LHC observe rare exotic processes in an extremely low-background environment. In this work, we summarize current status plans for FPF,...
We consider the sensitivity of fixed-target neutrino experiments at luminosity frontier to light stable states, such as those present in models MeV-scale dark matter. To ensure correct thermal relic abundance, states must annihilate via mediators, which turn provide an access portal for direct production colliders or fixed targets. Indeed, this framework endows beams produced facilities with a companion `dark matter beam', may be detected excess elastic scattering events off electrons nuclei...
Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark each their own beautiful structure, distinct particles, and forces. This review summarizes physics motivation sectors exciting opportunities experimental exploration. It is summary Intensity Frontier subgroup "New, Light, Weakly-coupled Particles" Community...
We explore the sensitivity of flavor-changing $b\ensuremath{\rightarrow}s$ transitions to a (sub-) GeV hidden sector with generic couplings standard model through Higgs, vector, and axion portals. The underlying two-body decays $B$ mesons, $B\ensuremath{\rightarrow}{X}_{s}\mathcal{S}$, ${B}^{0}\ensuremath{\rightarrow}\mathcal{S}\mathcal{S}$, where $\mathcal{S}$ denotes new GeV-scale particle, may significantly enhance yield monochromatic lepton pairs in final state via prompt...
All current experiments searching for an electron electric dipole moment (EDM) ${d}_{e}$ are performed with atoms and diatomic molecules. Motivated by significant recent progress in searches EDM-type signal molecules uncompensated spin, we provide estimate the expected Standard Model due to Cabibbo-Kobayashi-Maskawa (CKM) phase. We find that main contribution originates from effective electron-nucleon operator $\overline{e}i{\ensuremath{\gamma}}_{5}e\overline{N}N$, induced a combination of...
We analyze the prospects for detection of light sub-GeV dark matter produced in experiments designed to study properties neutrinos, such as MiniBooNE, T2K, SHiP, DUNE etc. present an improved production model, when couples hadronic states via a photon or baryonic vector mediator, incorporating bremsstrahlung vector. In addition elastic scattering, we also signatures undergoing deep inelastic quasielastic $\mathrm{NC}{\ensuremath{\pi}}^{0}$-like scattering detector producing neutral pions,...
A ''dark photon'' that mixes with the usual electromagnetic photon has cosmological consequences. The paper explores them for Big Bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB), finds new constraints this scenario from cosmology.
If dark matter (DM) particles are lighter than a few MeV/c^{2} and can scatter off electrons, their interaction within the solar interior results in considerable hardening of spectrum galactic received on Earth. For large range mass versus cross section parameter space, {m_{e},σ_{e}}, "reflected" component DM flux is far more energetic end point ambient energy distribution, making it detectable with existing detectors sensitive to an deposition 10-10^{3} eV. After numerically simulating...
A possible supersymmetric interpretation of the new Higgs-like 126 GeV resonance involves a high sfermion mass scale, from tens TeV to PeV or above. This scale provides sufficiently large loop corrections Higgs and can naturally resolve constraints flavor-violating observables, even with generic flavor structure in sector. We point out that such scales could still generate $CP$-violating electric dipole moments at interesting levels due enhancement left-right mixing. illustrate this by...
High-luminosity fixed-target neutrino experiments present a new opportunity to search for light sub-GeV dark matter and associated forces. We analyze the physics reach of these leptophobic states coupled Standard Model via gauging $U(1{)}_{B}$ baryon current. When baryonic vector is light, can decay matter, we find that MiniBooNE experiment in its current beam-dump configuration extend sensitivity fine structure constant down...
An extended Higgs sector may allow for new scalar particles well below the weak scale. In this work, we present a detailed study of light $S$ with enhanced coupling to leptons, which could be responsible existing discrepancy between experimental and theoretical determinations muon anomalous magnetic moment. We an ultraviolet completion model in terms lepton-specific two-Higgs doublet additional singlet. then analyze plethora constraints on universal low energy model, UV completion, along...
Experiments aiming to detect coherent neutrino-nucleus scattering present opportunities probe new light weakly coupled states, such as sub-GeV mass dark matter, in several extensions of the Standard Model. These states can be produced along with neutrinos collisions protons target, and their production rate enhanced if there exists a mediator on shell. We analyze sensitivity reach proposed experiments matter interacting Model via vector electromagnetic current. also determine corresponding...