A5040740338- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Muon and positron interactions and applications
- CCD and CMOS Imaging Sensors
- Medical Imaging Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Photocathodes and Microchannel Plates
- Plasma Diagnostics and Applications
- Quantum Chromodynamics and Particle Interactions
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
Massachusetts Institute of Technology
2013-2024
RIKEN BNL Research Center
2021
Illinois Institute of Technology
2021
Stony Brook University
2021
Brookhaven National Laboratory
2021
Thomas Jefferson National Accelerator Facility
2019
Indiana University Bloomington
2017
Los Alamos National Laboratory
2015
University of New Hampshire
2013
BP (United Kingdom)
1978
The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, R_{2γ}, direct measure contribution hard two-photon exchange section. In measurement, 2.01 GeV electron and positron beams were directed through hydrogen gas target internal DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers time-of-flight scintillators detected elastically scattered leptons in coincidence recoiling...
This paper describes the design, construction, and initial operation of SLD's upgraded vertex detector which comprises 96 two-dimensional charge-coupled devices (CCDs) with a total 307 Mpixel. Each pixel functions as an independent particle detecting element, providing space point measurements charged tracks typical precision 4 μm in each co-ordinate. The CCDs are arranged three concentric cylinders just outside beam-pipe surrounds e+e− collision SLAC Linear Collider (SLC). is powerful tool...
The physics case and an experimental overview of the MOLLER (Measurement Of a Lepton Electroweak Reaction) experiment at 12 GeV upgraded Jefferson Lab are presented. A highlight Fundamental Symmetries subfield 2007 NSAC Long Range Plan was SLAC E158 measurement parity-violating asymmetry $A_{PV}$ in polarized electron-electron (M{\o}ller) scattering. proposed will improve on this result by factor five, yielding most precise weak mixing angle low or high energy anticipated over next decade....
We describe the current status of DarkLight experiment at Jefferson Laboratory. is motivated by possibility that a dark photon in mass range 10 to 100 MeV/c$^2$ could couple sector Standard Model. will precisely measure electron proton scattering using MeV beam intensity 5 mA Laboratory energy recovering linac incident on windowless gas target molecular hydrogen. The complete final state including scattered electron, recoil proton, and e+e- pair be detected. A phase-I has been funded...
The direct search for dark matter is entering a period of increased sensitivity to the hypothetical Weakly Interacting Massive Particle (WIMP). One such technology that being examined scintillation only noble liquid experiment, MiniCLEAN. MiniCLEAN utilizes over 500 kg cryogen detect nuclear recoils from WIMP and serves as demonstration future detector order 50 100 tonnes. interchangeable between argon neon study A2 dependence potential signal examine backgrounds. unique modular design with...
We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions Standard Model search for physics. A unique opportunity exists carry out first proton's weak charge, $Q_W =1 - 4\sin^2θ_W$. 2200 hour parity violating asymmetry in elastic ep Q^2=0.03 (GeV/c)^2 employing 180 $μ$A 85% polarized beam 35 cm liquid Hydrogen target will determine charge with approximately 4% combined statistical systematic...
We give a short overview of the DarkLight detector concept which is designed to search for heavy photon A' with mass in range 10 MeV/c^2 < m(A') 90 and decays lepton pairs. describe intended operating environment, Jefferson Laboratory free electon laser, way extend DarkLight's reach using --> invisible decays.
Liquid argon is commonly used as a detector medium for neutrino physics and dark matter experiments in part due to its copious scintillation light production response excitation ionization by charged particle interactions. As appears the vacuum ultraviolet (VUV) regime difficult detect, wavelength-shifting materials are typically convert VUV visible wavelengths more easily detectable conventional means. In this work, we examine optical properties of poly(ethylene naphthalate) (PEN), recently...
Abstract We propose a new measurement of the ratio positron-proton to electron-proton elastic scattering at DESY. The purpose is determine contributions beyond single-photon exchange, which are essential for Quantum Electrodynamic (QED) description most fundamental process in hadronic physics. By utilizing 20 cm long liquid hydrogen target conjunction with extracted beam from DESY synchrotron, we can achieve an average luminosity $$2.12\times 10^{35}$$ <mml:math...
The GlueX experiment was designed to search for and study the pattern of gluonic excitations in meson spectrum produced through photoproduction reactions at a new tagged photon beam facility Hall D Jefferson Laboratory. particle identification capabilities will be enhanced by constructing DIRC (Detection Internally Reflected Cherenkov light) detector, utilizing components decommissioned BaBar DIRC. allow systematic studies kaon final states that are essential inferring quark flavor content...
We have separated the longitudinal (f00), transverse (f11), and longitudinal-transverse interference (f01) structure functions in 2H(e,e′p)n reaction at |q→|≈400MeV/c ω≈110MeV. A nonrelativistic calculation which includes effects due to final state interactions, meson exchange currents, isobar configurations agrees with measured f11 f01 but overpredicts f00 by 25% ( 2σ). The data are also compared results of previous function measurements.Received 24 July...
We report the first measurement of average electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged section is insensitive to leading effects hard two-photon exchange, giving more robust access proton’s electromagnetic form factors. The was extracted from data taken by OLYMPUS experiment at DESY, in which alternating stored electron positron beams were scattered a windowless gaseous hydrogen target. Elastic events identified coincident detection...
Abstract The search for a dark photon holds considerable interest in the physics community. Such force carrier would begin to illuminate sector. Many experiments have searched such particle, but so far it has proven elusive. In recent years concept of low mass gained popularity Of particular is 8 Be and 4 He anomaly, which could be explained by new fifth with 17 MeV/ c 2 . proposed Darklight experiment this potential at ARIEL 10-20 e + − invariant range. This proceeding will focus on...