Rouven Essig
A5044314185- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Black Holes and Theoretical Physics
- Astronomy and Astrophysical Research
- Advanced Semiconductor Detectors and Materials
- Photocathodes and Microchannel Plates
- Pulsars and Gravitational Waves Research
- Computational Physics and Python Applications
- Electron and X-Ray Spectroscopy Techniques
- Gamma-ray bursts and supernovae
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Climate Change Communication and Perception
- Scientific Research and Discoveries
Stony Brook University
2016-2025
Bariloche Atomic Centre
2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2024
Comisión Nacional de Energía Atómica
2024
University of Illinois Urbana-Champaign
2024
Fermi National Accelerator Laboratory
2013-2024
University of Chicago
2024
University of Washington
2024
State University of New York
2014-2023
The Ohio State University
2013
The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some most dark matter (DM) dominated objects known. We report on gamma-ray observations dSphs based 6 years Fermi Large Area Telescope data processed with new Pass 8 event-level analysis. None significantly detected in gamma rays, and we present upper limits DM annihilation cross section from a combined analysis 15 dSphs. These constraints among strongest robust to date lie below canonical thermal relic for mass $\lesssim$...
Fixed-target experiments are ideally suited for discovering new MeV--GeV mass $U(1)$ gauge bosons through their kinetic mixing with the photon. In this paper, we identify production and decay properties of light that dictate fixed-target search strategies. We summarize existing limits suggest five experimental approaches anticipate can cover most natural parameter space, using currently operating GeV-energy beams well-established detection methods. Such particularly timely in recent...
Direct detection strategies are proposed for dark matter particles with MeV to GeV mass. In this largely unexplored mass range, scattering electrons can cause single-electron ionization signals, which detectable current technology. Ultraviolet photons, individual ions, and heat interesting alternative signals. Focusing on ionization, we calculate the expected rates estimate sensitivity of possible experiments. Backgrounds that may be relevant discussed. Theoretically models probed existing...
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...
The dwarf spheroidal satellite galaxies of the Milky Way are some most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack astrophysical backgrounds, widely considered be among promising targets for indirect detection via $\ensuremath{\gamma}$ rays. Here we report on $\ensuremath{\gamma}$-ray observations 25 based 4 years Fermi Large Area Telescope (LAT) data. None significantly detected in rays, present flux upper limits between 500 MeV GeV. We...
This document proposes a collection of simplified models relevant to the design new-physics searches at LHC and characterization their results. Both ATLAS CMS have already presented some results in terms models, we encourage them continue expand this effort, which supplements both signature-based benchmark model interpretations. A is defined by an effective Lagrangian describing interactions small number new particles. Simplified can equally well be described masses cross-sections. These...
The first direct detection limits on dark matter in the MeV to GeV mass range are presented, using XENON10 data. Such light can scatter with electrons, causing ionization of atoms a detector target material and leading single- or few-electron events. We use $15\text{ }\text{ }\mathrm{kg}\text{ }\mathrm{day}$ data acquired 2006 set dark-matter---electron scattering cross section. strongest bound is obtained at 100 where...
Dark matter in the sub-GeV mass range is a theoretically motivated but largely unexplored paradigm. Such light masses are out of reach for conventional nuclear recoil direct detection experiments, may be detected through small ionization signals caused by dark matter-electron scattering. Semiconductors well-studied and particularly promising target materials because their $$ \mathcal{O} (1 eV) band gaps allow from particles as few hundred keV. Current technologies being adapted In this...
We perform an extensive survey of non-standard Higgs decays that are consistent with the 125 GeV Higgs-like resonance. Our aim is to motivate a large set new experimental analyses on existing and forthcoming data from Large Hadron Collider (LHC). The explicit search for exotic presents largely untapped discovery opportunity LHC collaborations, as such may be easily missed by other searches. emphasize uniquely sensitive potential existence weakly coupled particles provide unified discussion...
We study in detail sub-GeV dark matter scattering off electrons xenon, including the expected electron recoil spectra and annual modulation spectra. derive improved constraints using low-energy XENON10 XENON100 ionization-only data. For XENON10, addition to electron-recoil data corresponding about $1-3$ electrons, we include for first time events with $\gtrsim 4$ electrons. Assuming is momentum independent, this strengthens a previous cross-section bound by almost an order of magnitude...
We present the first direct-detection search for sub-GeV dark matter using a new ∼2-gram high-resistivity Skipper CCD from dedicated fabrication batch that was optimized searches. Using 24 days of data acquired in MINOS cavern at Fermi National Accelerator Laboratory, we measure lowest rates silicon detectors events containing one, two, three, or four electrons, and achieve world-leading sensitivity large range masses. Data taken with different thicknesses detector shield suggest correlation...
High-energy colliders offer a unique sensitivity to dark photons, the mediators of broken U(1) gauge theory that kinetically mixes with Standard Model (SM) hypercharge. Dark photons can be detected in exotic decay 125 GeV Higgs boson, h -> Z Z_D 4l, and Drell-Yan events, pp ll. If is by hidden-sector mechanism, then mixing between SM bosons also allows 4l. We show 14 TeV LHC 100 proton-proton collider provide powerful probes both channels. In case kinetic alone, direct production offers best...
In this paper, we review recent theoretical progress and the latest experimental results in jet substructure from Tevatron LHC. We status of outlook for calculation simulation tools studying substructure. Following up on report Boost 2010 workshop, present a new set benchmark comparisons techniques, focusing variables grooming methods that are collectively known as 'top taggers'. To facilitate further exploration, have attempted to collect, harmonize publish software implementations these techniques.
We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling ${\ensuremath{\alpha}}^{\ensuremath{'}}$ to electrons. Such particle ${A}^{\ensuremath{'}}$ can be produced in electron-nucleus fixed-target scattering and then decay an ${e}^{+}{e}^{\ensuremath{-}}$ pair, producing narrow resonance QED trident spectrum. Using APEX test run data, we searched mass range 175--250 MeV, found no evidence...
Dark matter particle annihilation or decay can produce monochromatic gamma-ray lines and contribute to the diffuse background. Flux upper limits are presented for spectral from 7 200 GeV background 4.8 264 obtained two years of Fermi Large Area Telescope data integrated over most sky. We give cross-section lifetime lower dark models that spectrum, including proposed as explanations PAMELA cosmic-ray data.
We revisit constraints on dark photons with masses below ∼ 100 MeV from the observations of Supernova 1987A. If are produced in sufficient quantity, they reduce amount energy emitted form neutrinos, conflict observations. For first time, we include effects finite temperature and density kinetic-mixing parameter, ϵ, this environment. This causes ϵ to weaken dark-photon mass 15 MeV. large-enough values it is well known that can be reabsorbed within supernova. Since rates reabsorption processes...
We have developed ultralow-noise electronics in combination with repetitive, nondestructive readout of a thick, fully depleted charge-coupled device (CCD) to achieve an unprecedented noise level 0.068 e^{-} rms/pixel. This is the first time that discrete subelectron has been achieved reproducible over millions pixels on stable, large-area detector. enables contemporaneous, discrete, and quantized measurement charge pixels, irrespective whether they contain zero electrons or thousands...
Weakly interacting massive particles (WIMPs) are a theoretical class of that excellent dark matter candidates. WIMP annihilation or decay may produce essentially monochromatic γ rays detectable by the Fermi Large Area Telescope (LAT) against astrophysical γ-ray emission Galaxy. We have searched for spectral lines in energy range 5–300 GeV using 3.7 years data, reprocessed with updated instrument calibrations and an improved dispersion model compared to previous Fermi-LAT Collaboration line...
We present new constraints on sub-GeV dark matter and photons from the electron beam-dump experiment E137 conducted at SLAC in 1980–1982. Dark interacting with electrons (e.g., via a photon) could have been produced electron-target collisions scattered off detector, producing striking, zero-background signature of high-energy electromagnetic shower that points back to beam dump. probes significant ranges parameter space constrains well-motivated possibility decay light dark-sector particles...
We present new direct-detection constraints on eV-to-GeV dark matter interacting with electrons using a prototype detector of the Sub-Electron-Noise Skipper-CCD Experimental Instrument. The results are based data taken in MINOS cavern at Fermi National Accelerator Laboratory. focus obtained two distinct readout strategies. For first strategy, we read out continuously, accumulating an exposure 0.177 gram-days. While observe no events containing three or more electrons, find large one- and...
A bstract We consider the constraints from Supernova 1987A on particles with small couplings to Standard Model. discuss a model fermion coupled dark photon, various mass relations in sector; millicharged particles; dark-sector fermions inelastic transitions; hadronic QCD axion; and an axion-like particle that couples Model proportional their mass. In cases, we develop new diagnostic for assessing when such is trapped at large mixing angles. Our bounds photon constrain masses ≲ 200 MeV, do...
Due to their proximity, high dark-matter content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection dark matter. Recently, eight new dSph candidates were discovered using first year data from Dark Energy Survey (DES). We searched gamma-ray emission coincident with positions these objects in six years Fermi Large Area Telescope data. found no significant excesses emission. Under assumption that...
The Sub-Electron-Noise Skipper CCD Experimental Instrument (SENSEI) uses the recently developed Skipper-CCD technology to search for electron recoils from interaction of sub-GeV dark matter particles with electrons in silicon. We report first results a prototype SENSEI detector, which collected 0.019 g day commissioning data above ground at Fermi National Accelerator Laboratory. These are sufficient set new direct-detection constraints masses between ∼500 keV and 4 MeV. Moreover, since these...
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....