P. R. Burchat
A5108046070- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Advanced Data Storage Technologies
- Distributed and Parallel Computing Systems
- Monetary Policy and Economic Impact
- Particle accelerators and beam dynamics
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Radio Astronomy Observations and Technology
Stanford University
2014-2025
Argonne National Laboratory
2024
Kavli Institute for Particle Astrophysics and Cosmology
2014-2021
SLAC National Accelerator Laboratory
1989-2019
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2018
University of the Basque Country
2018
Laboratoire d’Annecy de Physique des Particules
2018
Institut National de Physique Nucléaire et de Physique des Particules
2018
Centre National de la Recherche Scientifique
2018
Universitat de Barcelona
2018
(Abridged) We describe here the most ambitious survey currently planned in optical, Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST have unique capability faint time domain. The design is driven four main themes: probing dark energy matter, taking an inventory Solar System, exploring transient optical sky, mapping Milky Way. wide-field ground-based system sited at Cerro Pach\'{o}n northern Chile. telescope 8.4 m...
This biennial review summarizes much of Particle Physics. Using data from previous editions, plus 1900 new measurements 700 papers, we list, evaluate, and average measured properties gauge bosons, leptons, quarks, mesons, baryons. We also summarize searches for hypothetical particles such as Higgs heavy neutrinos, supersymmetric particles. All the particle search limits are listed in Summary Tables. give numerous tables, figures, formulae, reviews topics Standard Model, detectors,...
We employ robust weak gravitational lensing measurements to improve cosmological constraints from of the galaxy cluster mass function and its evolution, using X-ray selected clusters detected in ROSAT All-Sky Survey. Our analysis constrains absolute scale such at 8 per cent level, including both statistical systematic uncertainties. Combining it with survey data follow-up observations, we find a tight constraint on combination mean matter density late-time normalization power spectrum,...
We report weak-lensing masses for 51 of the most X-ray luminous galaxy clusters known. This cluster sample, introduced earlier in this series papers, spans redshifts 0.15 < z_cl 0.7, and is well suited to calibrate mass proxies current cosmology experiments. Cluster are measured with a standard `color-cut' lensing method from three-filter photometry each field. Additionally, 27 fields at least five-filter photometry, we measure high-accuracy using new that exploits all information available...
This is the first in a series of papers which we measure accurate weak-lensing masses for 51 most X-ray luminous galaxy clusters known at redshifts 0.15<z<0.7, order to calibrate and other mass proxies cosmological cluster experiments. The primary aim improve absolute calibration observables, currently dominant systematic uncertainty count Key elements this work are rigorous quantification uncertainties, high-quality data reduction photometric calibration, "blind" nature analysis avoid...
In light of the tension in cosmological constraints reported by Planck team between their Sunyaev–Zel'dovich-selected cluster counts and Cosmic Microwave Background (CMB) temperature anisotropies, we compare mass estimates with robust, weak-lensing measurements from Weighing Giants (WtG) project. For 22 clusters common cosmology sample WtG, find an overall ratio 〈MPlanck/MWtG〉 = 0.688 ± 0.072. Extending to not used analysis yields a consistent value 0.698 0.062 38 common. Identifying masses...
The Large Synoptic Survey Telescope (LSST) Dark Energy Science Collaboration (DESC) will use five cosmological probes: galaxy clusters, large scale structure, supernovae, strong lensing, and weak lensing. This Requirements Document (SRD) quantifies the expected dark energy constraining power of these probes individually together, with conservative assumptions about analysis methodology follow-up observational resources based on our current understanding evolution within field in coming...
The authors review the experimental measurements and theoretical descriptions of leptonic semileptonic decays particles containing a single heavy quark, either charm or bottom. Measurements bottom are used to determine magnitudes two fundamental parameters standard model, Cabibbo-Kobayashi-Maskawa matrix elements ${V}_{\mathrm{cb}}$ ${V}_{\mathrm{ub}}$. These connected with physics quark flavor mass, they have important implications for breakdown $\mathrm{CP}$ symmetry. To extract precise...
We present a new high-statistics measurement of the cross section for process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ at center-of-mass energy 29 GeV invariant pion-pair masses $M({\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ between 350 MeV/${\mathit{c}}^{2}$ and 1.6 GeV/${\mathit{c}}^{2}$. observe ${f}_{2}(1270)$ measure its radiative width to be...
We present improved methods for using stars found in astronomical exposures to calibrate both star and galaxy colors as well adjust the instrument flat field. By developing a spectroscopic model SDSS stellar locus color-color space, synthesizing an expected locus, simultaneously solving all unknown zeropoints when fitting instrumental we increase calibration accuracy of matching. also use new combined technique estimate flat-field models Subaru SuprimeCam camera, forming `star flats' based...
We present the first direct measurements of pion valence-quark momentum distribution which is related to square light-cone wave function. The were carried out using data on diffractive dissociation $500\mathrm{GeV}/c$ ${\ensuremath{\pi}}^{\ensuremath{-}}$ into dijets from a platinum target at Fermilab experiment E791. results show that $|q\overline{q}〉$ asymptotic function describes well for ${Q}^{2}\ensuremath{\sim}10(\mathrm{GeV}/c{)}^{2}$ or more. also measured transverse dijets.
We present an open source Python library for simulating overlapping (i.e., blended) images of galaxies and performing self-consistent comparisons detection deblending algorithms based on a suite metrics. The package, named Blending Toolkit (BTK), serves as modular, flexible, easy-to-install, simple-to-use interface exploring analyzing systematic effects related to blended in cosmological surveys such the Vera Rubin Observatory Legacy Survey Space Time (LSST). BTK has three main components:...
We have studied the diffractive dissociation into dijets of 500 GeV/c pions scattering coherently from carbon and platinum targets. Extrapolating to asymptotically high energies (where t(min)-->0), we find that when per-nucleus cross section for this process is parametrized as sigma = sigma0Aalpha, alpha has values near 1.6, exact result depending on jet transverse momentum. These are in agreement with those predicted by theoretical calculations color-transparency.
Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report first directly measured constraint on decay-width difference Delta Gamma for mass eigenstates of D0-D0bar system. We obtain our result from lifetime measurements decays D0 --> K-pi+ and K-K+, under assumption CP invariance, which implies that are same. The K-K+ (the CP-even final state is \tau_KK = 0.410 +/- 0.011 0.006 ps, (an equal mixture CP-odd states tau_Kpi 0.413 0.003 0.004 ps. 2(Gamma_KK -...
We observe both the JPC=1++ f1(1285) and JPC=0−+ η’(958) in tagged two-photon interactions untagged interactions. The measured Q2 dependence decay distribution support spin parity assignment. radiative width of is as (M2/Q2)Γγγ*=9.4±2.5±1.7 keV, on assumption a ρ-pole form factor.Received 18 September 1987DOI:https://doi.org/10.1103/PhysRevLett.59.2012©1987 American Physical Society
We confirm the observation of a spin-1 resonance at 1423 MeV in K0SK±π∓ system produced single-tagged two-photon interactions. The Dalitz plot indicates that this decays primarily via K*K intermediate state. measure radiative width times branching ratio BKK¯π(M2/Q2)Γγγ*=3.2±1.4±0.6 keV on assumption ρ-pole form factor.Received 18 September 1987DOI:https://doi.org/10.1103/PhysRevLett.59.2016©1987 American Physical Society
We report measurements of $\sin{2\beta}$ and $\cos{2\beta}$ from a time-dependent Dalitz plot analysis $B^{0} \to D^{(*)} h^{0}$ with $D K_{S}^{0} \pi^{+} \pi^{-}$ decays, where the light unflavored neutral hadron $h^{0}$ is $\pi^{0}$, $\eta$, or $\omega$ meson. The performed combination final data sets \babar\ Belle experiments containing $471 \times 10^{6}$ $772 $B\bar{B}$ pairs collected at $\Upsilon\left(4S\right)$ resonance asymmetric-energy B factories PEP-II SLAC KEKB KEK,...
Four data sets collected with the Mark II detector during its operation at SPEAR and PEP e+e− storage rings SLAC are used to study Bose-Einstein correlation between pairs triplets of like-sign charged pions. The represent four different regions energy available for hadron production: J/ψ √s =3.095 GeV, typical hadronic ≊5 GeV in two-photon events, annihilation =4–7 above J/ψ, =29 GeV. is studied as a function Q2, four-momentum difference squared pair, Q32, an analogous quantity defined...
Current and future imaging surveys will measure cosmic shear with statistical precision that demands a deeper understanding of potential systematic biases in galaxy shape measurements than has been achieved to date. We use analytic computational techniques study the impact on two atmospheric chromatic effects for ground-based such as Dark Energy Survey Large Synoptic Telescope (LSST): (1) differential refraction (2) wavelength dependence seeing. investigate using point-spread function (PSF)...
This paper presents measurements of the production Ds- mesons relative to Ds+ as functions x_F and square p_t for a sample 2445 Ds decays phi pi. The were produced in Fermilab experiment E791 with 500 GeV/c pi- incident on one platinum four carbon foil targets. acceptance-corrected integrated asymmetry range -0.1 0.5 Ds+- is 0.032 +- 0.022 0.022, consistent no net asymmetry. results, p_t, are compared predictions large observed D+- same experiment. These comparisons support hypothesis that...
In Stage-IV imaging surveys, a significant amount of the cosmologically useful information is due to sources whose images overlap with those other on sky. The cosmic shear signal primarily encoded in estimated shapes observed galaxies and thus directly impacted by overlaps. We introduce framework based Fisher formalism analyze effects overlapping (blending) estimation shear. For Rubin Observatory Legacy Survey Space Time (LSST), we present expected loss statistical sensitivity for ten-year...