A5114378071- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- CCD and CMOS Imaging Sensors
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Surface Chemistry and Catalysis
- Nuclear physics research studies
- International Science and Diplomacy
- Medical Imaging Techniques and Applications
- Gas Dynamics and Kinetic Theory
- Radiation Effects in Electronics
- Porphyrin and Phthalocyanine Chemistry
- Molecular Junctions and Nanostructures
- Gamma-ray bursts and supernovae
- Scientific Computing and Data Management
- Distributed and Parallel Computing Systems
SLAC National Accelerator Laboratory
2020-2023
University of California, Los Angeles
2016-2023
Institute of High Energy Physics
2017-2022
University of Maryland, College Park
2018
HUN-REN Institute for Nuclear Research
2018
UCLA Health
2017
University of Iowa
2017
Johns Hopkins University
2017
University of Kansas
2017
University of California, Davis
2016
The structure−electronic structure relationship of nonmetalated meso-tetraphenyl porphyrin (2H-TPP) on the (111) surfaces Ag, Cu, and Au was studied with a combination scanning tunneling microscopy, photoelectron spectroscopy, density functional theory. We observe that molecules form 2D network Ag(111), driven by attractive intermolecular interactions, while surface migration barriers are comparatively small charge transfer to adsorbed is minimal. This in contrast significant observed...
Objective. To determine the clinical and epidemiological characteristics that predispose to risk factors for development of hypertensive disorders pregnancy in pregnant women who attend prenatal consultation at University Hospital Guayaquil. Method. The study population consisted attended consultations, evaluated with a longitudinal design descriptive observational nature. sample included total 104 subjected data collection protocol combined application questionnaire validated by experts...
The constituents of dark matter are still unknown, and the viable possibilities span a vast range masses. physics community has established searching for sub-GeV as high priority identified accelerator-based experiments an essential facet this search strategy. A key goal program is testing broad idea thermally produced through designed to directly produce particles. most sensitive way production light use primary electron beam it in fixed-target collisions. Light Dark Matter eXperiment...
VFAT3 is the front-end ASIC designed specifically for readout of GEM detectors within CMS experiment during high luminosity phase LHC at CERN. This paper presents analog and digital design plus measured functional characterization results. Key goals were optimization to charge characteristics maximizing signal noise, timing resolution operation particle rate. There are 128 channels comprising preamplifier, shaper constant fraction discriminator (CFD). Features include programmable polarity...
A bstract The Light Dark Matter eXperiment (LDMX) is an electron-beam fixed-target experiment designed to achieve comprehensive model independent sensitivity dark matter particles in the sub-GeV mass region. An upgrade LCLS-II accelerator will increase beam energy available LDMX from 4 8 GeV. Using detailed GEANT4-based simulations, we investigate effect of increased on capabilities separate signal and background, demonstrate that veto methodology developed for GeV successfully rejects...
Ecological niche models play an import role in species distribution prediction. They provideways to study biodiversity distribution, past and present, understand its causes, propose scenariosand strategies for sustainable use preservation initiatives. modeling usuallyinvolves many algorithms, environmental variables, data types formats, both pre post analysiswork. That complexity forces experts know software packages tomanually solve technical issues. openModeller was conceived as a...
The CMS Collaboration has been developing large-area triple-gas electron multiplier (GEM) detectors to be installed in the muon Endcap regions of experiment 2019 maintain forward trigger and tracking performance at High-Luminosity upgrade Large Hadron Collider (LHC); 10 preproduction were built CERN commission first assembly line quality controls (QCs). These detector early 2017 participated LHC run. collaboration prepared several additional QC lines for distributed mass production 160 GEM...
The Heavy Photon Search (HPS) experiment searches for an electro-produced dark photon using electron beam provided by the CEBAF accelerator at Thomas Jefferson National Accelerator Facility. HPS has successfully completed two engineering runs. In 2015 a 1.056 GeV, 50 nA beam, 1.7 days (10 mC) of data was obtained and 5.4 (92.5 collected in 2016 2.3 200 beam. addition, will complete its first physics run summer 2019. looks photons through distinct methods, resonance search $e^{+}e^{-}$...
A bstract Sphaleron and instanton solutions of the Standard Model provide violation baryon lepton numbers could lead to spectacular events at LHC or future colliders. Certain models new physics can also sphaleron-like vacuum transitions. This nonperturbative be relevant generation matter-antimatter asymmetry universe. We have developed BaryoGEN, an event generator that facilitates exploration transitions in proton-proton collisions with minimal assumptions. BaryoGEN outputs standard Les...
The Heavy Photon Search (HPS) experiment is designed to search for a new vector boson $A^\prime$ in the mass range of 20 MeV/$c^2$ 220 that kinetically mixes with Standard Model photon couplings $\epsilon^2 >10^{-10}$. In addition general importance exploring light, weakly coupled physics difficult probe high-energy colliders, prime motivation this possibility sub-GeV thermal relics constitute dark matter, scenario requires comparably light mediator, where models hidden $U(1)$ gauge...
The Heavy Photon Search experiment (HPS) at the Thomas Jefferson National Accelerator Facility searches for electro-produced dark photons. We report results from 2016 Engineering Run consisting of 10608/nb data both prompt and displaced vertex searches. A search a resonance in $e^+e^-$ invariant mass distribution between 39 179 MeV showed no evidence photons above large QED background, limiting coupling {\epsilon}^2 {\geq} 10^-5, agreement with previous vertices excess signal over background...
The luminosity, latency, and trigger rate foreseen at the High Luminosity LHC (HL-LHC) present challenges to efficient readout of Cathode Strip Chambers (CSCs, [1]) CMS end cap muon detector. Upgrades electronics are targeted for inner rings CSCs in each station, which have highest flux particles. upgrades comprise digital cathode front boards nearly deadtimeless long latency operating capability, new DAQ that transmit data from detectors with higher-bandwidth links, a concentrator/interface...
VFAT3 is a front-end ASIC designed for the readout of GEM detectors in CMS Muon system. The strategy chip design was to full at once but provide extensive test and debug facilities individual characterization each internal module. verification platform consists three parts; namely software (running on PC), firmware (designed Kintex-7 FPGA development board) selection dedicated hardware boards different stages verification. system accommodate all steps needed fully chip. first step functional...
An analog front-end in 130 (nm) CMOS technology was developed for the readout of triple-GEM detectors CMS experiment at CERN. The has programmable peaking time - 15, 25, 35 and 45 (ns) gain 48, 16.4 8.6 (mV/fC) is able to support a detector capacitance ranging from 0 120 (pF). In design, many optimization techniques have been used minimize power consumption given noise timing requirements. Consequently, single channel consumes 790 (μA), achieves an equivalent chargeof 620 (e-) (pF) with...