A5101807703- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Medical Imaging Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Superconducting Materials and Applications
- Radioactive Decay and Measurement Techniques
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Radiopharmaceutical Chemistry and Applications
- Crystallography and Radiation Phenomena
- Neuroendocrine Tumor Research Advances
- X-ray Spectroscopy and Fluorescence Analysis
- Enzyme Structure and Function
- Astronomical and nuclear sciences
- Quantum and Classical Electrodynamics
Virginia Tech
2014-2019
Syracuse University
2012-2015
National Taiwan University
2006-2014
We report the first measurement of parity-violating asymmetry APV in elastic scattering polarized electrons from Pb208. is sensitive to radius neutron distribution (Rn). The result APV=0.656±0.060(stat)±0.014(syst) ppm corresponds a difference between radii and proton distributions Rn−Rp=0.33−0.18+0.16 fm provides electroweak observation skin which expected heavy, neutron-rich nucleus.Received 12 January 2012DOI:https://doi.org/10.1103/PhysRevLett.108.112502© 2012 American Physical Society
This paper describes the design and construction of MicroBooNE liquid argon time projection chamber associated systems. is first phase Short Baseline Neutrino program, located at Fermilab, will utilize capabilities detectors to examine a rich assortment physics topics. In this document details specifications, assembly procedures, acceptance tests are reported.
A Short-Baseline Neutrino (SBN) physics program of three LAr-TPC detectors located along the Booster Beam (BNB) at Fermilab is presented. This new SBN Program will deliver a rich and compelling opportunity, including ability to resolve class experimental anomalies in neutrino perform most sensitive search date for sterile neutrinos eV mass-scale through both appearance disappearance oscillation channels. Using data sets 6.6e20 protons on target (P.O.T.) LAr1-ND ICARUS T600 plus 13.2e20...
We use distorted wave electron scattering calculations to extract the weak charge form factor ${F}_{W}(\overline{q})$, radius ${R}_{W}$, and point neutron ${R}_{n}$ of ${}^{208}$Pb from Lead Radius Experiment (PREX) parity-violating asymmetry measurement. The is Fourier transform density at average momentum transfer $\overline{q}=0.475$ fm${}^{\ensuremath{-}1}$. find...
The development and operation of liquid-argon time-projection chambers for neutrino physics has created a need new approaches to pattern recognition in order fully exploit the imaging capabilities offered by this technology. Whereas human brain can excel at identifying features recorded events, it is significant challenge develop an automated, algorithmic solution. Pandora Software Development Kit provides functionality aid design implementation pattern-recognition algorithms. It promotes...
We present several studies of convolutional neural networks applied to data coming from the MicroBooNE detector, a liquid argon time projection chamber (LArTPC). The algorithms studied include classification single particle images, localization and neutrino interactions in an image, detection simulated event overlaid with cosmic ray backgrounds taken real detector data. These demonstrate potential for identification or on interactions. also address technical issues that arise when applying...
The low-noise operation of readout electronics in a liquid argon time projection chamber (LArTPC) is critical to properly extract the distribution ionization charge deposited on wire planes TPC, especially for induction planes. This paper describes characteristics and mitigation observed noise MicroBooNE detector. MicroBooNE's single-phase LArTPC comprises two one collection sense plane with total 8256 wires. Current induced each TPC amplified shaped by custom low-power, ASICs immersed...
The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV and beam energy E =3.48 to be A_PV -23.80 +/- 0.78 (stat) 0.36 (syst) parts per million. This result is consistent with zero contribution strange quarks combination electric magnetic form factors G_E^s + 0.517 G_M^s 0.003 0.010 0.004 0.009 (ff), where third error due limits precision on electromagnetic...
We have measured the beam-normal single-spin asymmetry $A_n$ in elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for first time $^4$He, $^{12}$C, $^{208}$Pb. For $^1$H, $^4$He measurements are agreement with calculations that relate to imaginary part two-photon exchange amplitude including inelastic intermediate states. Surprisingly, $^{208}$Pb result is significantly smaller than corresponding prediction using same formalism. These results suggest a systematic...
In neutrino oscillation experiments, interactions at the detector are simulated using event generators which attempt to reflect our understanding of nuclear physics. We study impact different and models on determination parameters. use two independent generators, GENIE GiBUU, apply them a setup with conventional beam aiming water \v{C}erenkov detector, for only QE-like sample is selected. Subsequently, we perform fit parameters in $\nu_\mu$ disappearance channel.
The MicroBooNE liquid argon time projection chamber (LArTPC) has been taking data at Fermilab since 2015 collecting, in addition to neutrino beam, cosmic-ray muons. Results are presented on the reconstruction of Michel electrons produced by decay rest abundantly TPC, and given their well known energy spectrum can be used study MicroBooNE's detector response low-energy (electrons with energies up ~ 50 MeV). We describe fully-automated algorithm developed reconstruct electrons, which a sample...
The success of the ambitious programs both long- and short-baseline neutrino-oscillation experiments employing liquid-argon time-projection chambers will greatly rely on precision with which weak response argon nucleus can be estimated. In E12-14-012 experiment at Jefferson Lab Hall A, we have studied properties by scattering a high-quality electron beam off high-pressure gaseous target. Here, present measured $^{40}$Ar$(e,e^{\prime})$ double differential cross section incident energy...
To be able to achieve their physics goals, future neutrino-oscillation experiments will need reconstruct the neutrino energy with very high accuracy. In this work, we analyze how reconstruction may affected by realistic detection capabilities, such as resolutions, efficiencies, and thresholds. This allows us estimate well detector performance needs determined a priori in order avoid sizable bias measurement of relevant oscillation parameters. We compare kinematic calorimetric methods context...
To probe CP violation in the leptonic sector using GeV energy neutrino beams current and future experiments argon detectors, precise models of complex underlying antineutrino interactions are needed. The E12-14-012 experiment at Jefferson Lab Hall A was designed to perform a combined analysis inclusive exclusive electron scatterings on both ($N = 22$) titanium ($Z nuclei beams. measurement nucleus provides essential information understand scattering argon, large contribution which comes from...
The parity-violating asymmetries between a longitudinally polarized electron beam and an unpolarized deuterium target have been measured recently. measurement covered two kinematic points in the deep-inelastic scattering region five nucleon resonance region. We provide here details of experimental setup, data analysis, results on all asymmetry measurements including those inclusive pion production beam-normal asymmetries. were used to extract electron-quark weak effective couplings, provided...
We discuss a technique for measuring charged particle's momentum by means of multiple Coulomb scattering (MCS) in the MicroBooNE liquid argon time projection chamber (LArTPC). This method does not require full particle ionization track to be contained inside detector volume as other reconstruction methods do (range-based and calorimetric reconstruction). motivate use this technique, describe tuning underlying phenomenological formula, quantify its performance on fully beam-neutrino-induced...
We report on parity-violating asymmetries in the nucleon resonance region measured using inclusive inelastic scattering of 5–6 GeV longitudinally polarized electrons off an unpolarized deuterium target. These results are first asymmetry data beyond Δ(1232). They provide a verification quark-hadron duality—the equivalence quark- and hadron-based pictures nucleon—at (10–15)% level this electroweak observable, which is dominated by contributions from γZ interference structure functions. In...
The E12-14-012 experiment performed at Jefferson Lab Hall A has collected inclusive electron-scattering data for different targets the kinematics corresponding to beam energy 2.222 GeV and scattering angle 15.54 deg. Here we present a comprehensive analysis of compare double-differential cross sections electrons, extracted using solid (aluminum, carbon, titanium) closed argon-gas cell. extend over broad range transfer, where quasielastic interaction, Delta-resonance excitation, inelastic...
We discuss the implementation of nuclear model based on realistic spectral functions in GENIE neutrino interaction generator. Besides improving Fermi gas description ground state, our scheme involves a new prescription for $Q^2$ selection, meant to efficiently enforce energy momentum conservation. The results simulations, validated through comparison electron scattering data, have been obtained variety target nuclei, ranging from carbon argon, and cover kinematical region which quasi elastic...
The MicroBooNE detector is a liquid argon time projection chamber at Fermilab designed to study short-baseline neutrino oscillations and neutrino-argon interaction cross-section. Due its location near the surface, good understanding of cosmic muons as source backgrounds fundamental importance for experiment. We present method using an external 0.5 m (L) × (W) muon counter stack, installed above main detector, determine cosmic-ray reconstruction efficiency in MicroBooNE. Data are acquired...
The development and operation of Liquid-Argon Time-Projection Chambers for neutrino physics has created a need new approaches to pattern recognition in order fully exploit the imaging capabilities offered by this technology. Whereas human brain can excel at identifying features recorded events, it is significant challenge develop an automated, algorithmic solution. Pandora Software Development Kit provides functionality aid design implementation pattern-recognition algorithms. It promotes...
We examine possible J^PC quantum number assignments for the X(3872). Angular correlations between final state particles in X(3872) --> pi+pi- J/psi decays are used to rule out values of 0++ and 0-+. The shape mass distribution near its upper kinematic limit favors S-wave over P-wave as relative orbital angular momentum final-state dipion J/psi, which strongly disfavors 1-+ 2-+ assignments. accumulated evidence a = 1++ assignment X(3872), although 2++ possibility is not ruled by tests...
The interpretation of the signals detected by high precision experiments aimed at measuring neutrino oscillations requires an accurate description neutrino-nucleus cross sections. One key element analysis is treatment nuclear effects, which one main sources systematics for accelerator based such as Long Baseline Neutrino Experiment (LBNE). A considerable effort currently being made to develop theoretical models capable providing a fully quantitative sections in kinematical regime relevant...