A5017193245- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Climate variability and models
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Meteorological Phenomena and Simulations
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Geophysics and Sensor Technology
- Nuclear physics research studies
- Geophysics and Gravity Measurements
- Semiconductor materials and devices
- Advanced Frequency and Time Standards
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Quantum, superfluid, helium dynamics
Thomas Jefferson National Accelerator Facility
2016-2025
Analysis Group (United States)
2025
University of California, Riverside
2024
High Energy Accelerator Research Organization
2008-2022
Pennsylvania State University
2022
University of Maryland, College Park
1989-2021
Los Alamos National Laboratory
2021
Lawrence Berkeley National Laboratory
2021
Old Dominion University
2019-2020
Indian Institute of Technology Madras
2020
A neutrino burst was observed in the Kamiokande II detector on 23 February, 7:35:35 UT (\ifmmode\pm\else\textpm\fi{}1 min) during a time interval of 13 sec. The signal consisted 11 electron events energy 7.5 to 36 MeV, which first two point back Large Magellanic Cloud with angles 18\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}18\ifmmode^\circ\else\textdegree\fi{} and 15\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}27\ifmmode^\circ\else\textdegree\fi{}.
Atmospheric general circulation models used for climate simulation and weather forecasting require the fluxes of radiation, heat, water vapor, momentum across land-atmosphere interface to be specified. These are calculated by submodels called land surface parameterizations. Over last 20 years, these parameterizations have evolved from simple, unrealistic schemes into credible representations global soil-vegetation-atmosphere transfer system as advances in plant physiological hydrological...
The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade is under construction, to increase luminosity by two orders magnitude during a three-year shutdown, with ultimate goal 8E35 /cm^2 /s luminosity. To exploit increased luminosity, been proposed. A new international collaboration Belle-II, being formed. Technical Design Report presents physics motivation, basic methods accelerator upgrade, as...
A data sample of 1040 days from the Kamiokande II detector, consisting subsamples 450 at electron-energy threshold Ee≥9.3 MeV and 590 Ee≥7.5 MeV, yields a clear directional correlation solar-neutrino-induced electron events with respect to Sun measurement differential distribution. These provide unequivocal evidence for production B8 by fusion in Sun. The measured flux solar neutrinos two relative prediction standard model is 0.46±0.05(stat)±0.06(syst). total tested short-term time...
The properties of the Kamiokande-II detector and method measurement are described in detail. data on neutrino burst from supernova SN1987A 23 February 1987 at 7:35:35 UT\ifmmode\pm\else\textpm\fi{}1 min presented, with records earlier later observation periods which other events possibly associated might have occurred. There is no evidence for any excess neutrino-induced events, either a few seconds duration or over longer time interval, relative to usual count rate, excepting only UT....
We present a new set of leading twist parton distribution functions, referred to as "CJ15", which take advantage developments in the theoretical treatment nuclear corrections well data. The analysis includes for first time data on free neutron structure function from Jefferson Lab, and high-precision charged lepton W-boson asymmetry Fermilab. These significantly reduce uncertainty d/u ratio at large values x provide insights into partonic bound nucleons.
We perform the first global QCD analysis of polarized inclusive and semi-inclusive deep-inelastic scattering single-inclusive e^{+}e^{-} annihilation data, simultaneously fitting parton distribution fragmentation functions using iterative Monte Carlo method. Without imposing SU(3) symmetry relations, we find strange polarization to be very small, consistent with zero for both which provides a resolution quark puzzle. The combined also allows direct extraction from data isovector octet axial...
Advances in machine learning methods provide tools that have broad applicability scientific research. These techniques are being applied across the diversity of nuclear physics research topics, leading to advances will facilitate discoveries and societal applications. This Review gives a snapshot which has been transformed by techniques.
The Global Soil Wetness Project (GSWP) is an ongoing land surface modeling activity of the International Satellite Land-Surface Climatology (ISLSCP), a part Energy and Water Cycle Experiment. pilot phase GSWP deals with production two-year global dataset soil moisture, temperature, runoff, fluxes by integrating uncoupled schemes (LSSs) using externally specified forcings from observations standardized vegetation distributions. Approximately one dozen participating LSS groups in five nations...
The influence of the global warming on tropical cyclones has been examined using a high resolution AGCM. Two ten-year integrations were performed with JMA model at T106 horizontal resolution. For control experiment, observed SST for period 1979-1988 is prescribed, while doubling CO2 (2 × CO2) anomaly due to estimated from coupled transient experiment (Tokioka et al. 1995) added used in experiment. results experiments show that significant reduction frequency possible response greenhouse...
The Simple Biosphere Model (SiB) of Sellers et al. was designed to simulate the interactions between Earth's land surface and atmosphere by treating vegetation explicitly realistically, thereby incorporating biophysical controls on exchanges radiation, momentum, sensible latent heat two systems. This paper describes steps taken implement SiB in a modified version National Meteorological Center's global spectral general circulation model (GCM) explores impact implementation simulated fluxes...
The method of $^{8}\mathrm{B}$ solar-neutrino measurement by means the reaction ${\ensuremath{\nu}}_{e}e\ensuremath{\rightarrow}{\ensuremath{\nu}}_{e}e$ in Kamiokande II detector is described detail. A data sample 1040 live days time period January 1987 through April 1990 yields a clear directional correlation solar-neutrino-induced electron events with respect to Sun and differential energy distribution. measured flux solar neutrinos from subsamples 450 at threshold...
We present a comprehensive new global QCD analysis of polarized inclusive deep-inelastic scattering, including the latest high-precision data on longitudinal and transverse polarization asymmetries from Jefferson Lab elsewhere. The is performed using iterative Monte Carlo fitting technique which generates stable fits to parton distribution functions (PDFs) with statistically rigorous uncertainties. Inclusion leads reduction in PDF errors for valence sea quarks, as well gluon uncertainty at...
We perform the first global QCD analysis of parton distribution functions (PDFs) in pion, combining πA Drell-Yan data with leading neutron electroproduction from HERA within a Monte Carlo approach based on nested sampling. Inclusion allows pion PDFs to be determined down much lower values x, relatively weak model dependence uncertainties chiral splitting function. The combined reveals that gluons carry significantly higher momentum fraction, ∼30%, than inferred alone, sea quarks carrying...
In this paper we perform the first simultaneous QCD global analysis of data from semi-inclusive deep inelastic scattering, Drell-Yan, $e^+e^-$ annihilation into hadron pairs, and proton-proton collisions. Consequently, are able to extract a universal set non-perturbative functions that describes observed asymmetries in these reactions. The outcome our indicates single transverse-spin high-energy collisions have common origin. Furthermore, achieve phenomenological agreement with lattice on up...
We construct an improved implementation for combining transverse-momentum-dependent (TMD) factorization and collinear factorization. TMD is suitable low transverse momentum physics, while high momenta a cross section integrated over momentum. The result modified version of the standard $W+Y$ prescription traditionally used in Collins-Soper-Sterman (CSS) formalism related approaches. further argue that questions regarding shape $Q$ dependence sections at lower are largely governed by matching...
We report on the first global QCD analysis of quark transversity distributions in nucleon from semi-inclusive deep-inelastic scattering (SIDIS), using a new Monte Carlo method based nested sampling and constraints isovector tensor charge $g_T$ lattice QCD. A simultaneous fit to available SIDIS Collins asymmetry data is compatible with values extracted comprehensive reanalysis existing simulations, contrast previous analyses which found significantly smaller values. The contributions $u$ $d$...
We perform a comprehensive new Monte Carlo analysis of high-energy lepton-lepton, lepton-hadron and hadron-hadron scattering data to simultaneously determine parton distribution functions (PDFs) in the proton hadron fragmentation (FFs). The includes all available semi-inclusive deep-inelastic single-inclusive $e^+ e^-$ annihilation for pions, kaons unidentified charged hadrons, which allows flavor dependence be constrained. Employing multi-step fitting strategy more flexible parametrizations...
How the bulk of Universe's visible mass emerges and how it is manifest in existence properties hadrons are profound questions that probe into heart strongly interacting matter. Paradoxically, lightest pseudoscalar mesons appear to be key further understanding emergent structure mechanisms. These mesons, namely pion kaon, Nambu-Goldstone boson modes QCD. Unravelling their partonic interplay between Higgs-boson mechanisms a common goal three interdependent approaches -- continuum QCD...
We review the present status of determination parton distribution functions (PDFs) in light precision requirements for LHC Run 2 and other future hadron colliders. provide brief reviews all currently available PDF sets use them to compute cross sections a number benchmark processes, including Higgs boson production gluon-gluon fusion at LHC. show that differences predictions obtained with various PDFs are due particular theory assumptions made fits those PDFs. discuss uncertainties kinematic...
We perform the first simultaneous extraction of unpolarized parton distributions and fragmentation functions from a Monte Carlo analysis inclusive semi-inclusive deep-inelastic scattering, Drell-Yan lepton-pair production, single-inclusive $e^+ e^-$ annihilation data. use data resampling techniques to thoroughly explore Bayesian posterior distribution extracted functions, $k$-means clustering on parameter samples identify configurations that give best description across all reactions....
We apply generative adversarial network (GAN) technology to build an event generator that simulates particle production in electron-proton scattering is free of theoretical assumptions about underlying dynamics. The difficulty efficiently training a GAN simulator lies learning the complicated patterns distributions particles physical properties. develop selects set transformed features from momenta can be generated easily by generator, and uses these produce augmented improve sensitivity...