A. J. Schwartz
A5074470338- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Rare-earth and actinide compounds
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Nuclear Materials and Properties
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Magnetic Properties of Alloys
- Microstructure and mechanical properties
- Fusion materials and technologies
- Intermetallics and Advanced Alloy Properties
- Particle accelerators and beam dynamics
- Advanced Materials Characterization Techniques
- Radiation Detection and Scintillator Technologies
- Radioactive element chemistry and processing
- Metallurgical and Alloy Processes
- Thermodynamic and Structural Properties of Metals and Alloys
University of Cincinnati
2015-2024
Lawrence Livermore National Laboratory
2005-2024
Campbell Collaboration
2012-2022
University of Illinois Chicago
2022
University of the Basque Country
2014-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
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
This article reports world averages of measurements $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavor Averaging Group using results available through summer 2016. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, \CP~violation semileptonic decays CKM matrix elements.
This work is on the Physics of B Factories. Part A this book contains a brief description SLAC and KEK Factories as well their detectors, BaBar Belle, data taking related issues. discusses tools methods used by experiments in order to obtain results. The results themselves can be found C. Please note that version 3 archive auxiliary book. uses notation alpha, beta, gamma for angles Unitarity Triangle. nominal phi_1, phi_2 phi_3. cite Eur. Phys. J. C74 (2014) 3026.
The Belle experiment, running at the KEKB e+e− asymmetric energy collider during first decade of century, achieved its original objective precisely measuring differences between particles and antiparticles in B system. After collecting 1000 fb−1 data various Υ resonances, also obtained many other physics results described this article.
This article reports world averages for measurements of b-hadron, c-hadron, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available at least through end 2009. Some presented use data spring 2010. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic decays.
This paper reports world averages of measurements $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavour Averaging Group using results available before April 2021. In rare cases, significant several months later are also used. For averaging, common input parameters used in various analyses adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic...
From a sample of 1172 +/- 61 D(+)-->pi(-)pi(+)pi(+) decays, we find gamma(D(+)-->pi(-)pi(+)pi(+))/gamma(D(+)-->K-pi(+)pi(+)) = 0.0311 0.0018(+0.0016)(-0.0026). Using coherent amplitude analysis to fit the Dalitz plot these strong evidence that scalar resonance mass 478(+24)(-23) 17 MeV/c(2) and width 324(+42)(-40) 21 accounts for approximately half all decays.
This article reports world averages for measurements of b-hadron and c-hadron properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available at end 2007. For averaging, common input parameters used in various analyses are adjusted (rescaled) to values, known correlations taken into account. The include branching fractions, lifetimes, neutral meson mixing parameters, CP violation semileptonic decays.
Inelastic neutron scattering and transmission electron microscopy have been used to study a single crystal of the ${\mathrm{Ni}}_{2}$ MnGa shape-memory ferromagnetic Heusler alloy in wide temperature range above martensitic phase transformation at ${\mathit{T}}_{\mathit{M}}$=220 K. Significant, though incomplete, softening [\ensuremath{\zeta}\ensuremath{\zeta}0] ${\mathrm{TA}}_{2}$ phonon branch has observed wave vector ${\mathrm{\ensuremath{\zeta}}}_{0}$\ensuremath{\approxeq}0.33. The...
We study the Dalitz plot of decay D(+)-->K(-)pi(+)pi(+) with a sample 15090 events from Fermilab experiment E791. Modeling amplitude as coherent sum known Kpi resonances and uniform nonresonant term, we do not obtain an acceptable fit. If allow mass width K(*)(0)(1430) to float, values consistent those PDG but chi(2) per degree freedom fit is still unsatisfactory. A good found when for presence additional scalar resonance, 797+/-19+/-43 MeV/c(2) 410+/-43+/-87 MeV/c(2). The become...
The branching ratio of core-valence transitions in electron energy-loss spectroscopy and x-ray absorption is linearly related to the expectation value spin-orbit operator valence states. Here, we analyze ${N}_{4,5}$ edges actinides find that sum rule gives an accurate result without need include interactions. not only useful study variations $5f$ interaction, it also allows us constrain count for given angular-momentum coupling conditions.
From a sample of 848+/-44 D(+)(s)-->pi(-)pi(+)pi(+) decays, we find gamma(D(+)(s)-->pi(-)pi(+)pi(+))/gamma(D(+)(s)-->straight phipi(+)) = 0.245+/-0.028(+0.019)(-0.012). Using Dalitz plot analysis this three body decay, significant contributions from the channels rho(0)(770)pi(+), rho(0)(1450)pi(+), f(0)(980)pi(+), f(2)(1270)pi(+), and f(0)(1370)pi(+). We also present values obtained for masses widths resonances f(0)(980) f(0)(1370).
We report measurements of the exclusive cross section for e+e−→D¯¯¯D, where D=D0 or D+, in center-of-mass energy range from D¯¯¯D threshold to 5 GeV with initial-state radiation. The analysis is based on a data sample collected Belle detector an integrated luminosity 673 fb−1.Received 18 October 2007DOI:https://doi.org/10.1103/PhysRevD.77.011103©2008 American Physical Society
Using 605 fb−1 of data collected at the Υ(4S) resonance we present a measurement inclusive radiative B-meson decay channel, B→Xsγ. For lower photon energy thresholds 1.7, 1.8, 1.9, and 2.0 GeV, as defined in rest frame B meson, measure partial branching fraction mean variance spectrum. At 1.7 GeV threshold obtain BF(B→Xsγ)=(3.45±0.15±0.40)×10−4, where errors are statistical systematic.Received 8 July 2009DOI:https://doi.org/10.1103/PhysRevLett.103.241801©2009 American Physical Society
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.
Synchrotron-radiation-based x-ray absorption, electron energy-loss spectroscopy in a transmission microscope, multielectronic atomic spectral simulations, and improved first-principles calculations (generalized gradient approximation the local density approximation) have been used to investigate electronic structure of light actinides: $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Th}$, $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{U}$,...
Medical and dental residents at the University of Rochester Center were surveyed to measure stress its causes. Their stress, as measured by brief symptom inventory, showed levels slightly above those an adult comparison group. The average decreased with residents' advancing training. Comparison top quartile lowest scores everyday significantly elevated for rotations in emergency room, greater frequency being on call, lesser amount sleep. reports that bleakest three days residency tended...
Transmission electron microscopy is used to acquire energy-loss spectra from phase-specific regions of Pu and U metal, $\mathrm{Pu}{\mathrm{O}}_{2}$ $\mathrm{U}{\mathrm{O}}_{2}$, aged, self-irradiated metal. The ${N}_{4,5}$ $(4d\ensuremath{\rightarrow}5f)$ are analyzed using the spin-orbit sum rule. Our results show that technique sensitive enough detect changes in branching ratio white-line peaks between metal dioxide both Pu. There a small change different metals, data trends as would be...
A model-independent partial-wave analysis of the S-wave component Kπ system from decays D+ mesons to three-body K−π+π+ final state is described. Data come Fermilab E791 experiment. Amplitude measurements are made independently for ranges K−π+ invariant mass, and results obtained below 825 MeV/c2, where previous exist only in two mass bins. This method parametrizing a decay amplitude represents new approach analyzing such decays. Though no model required S-wave, parametrization relatively...
We measure the production cross sections for e+e- -> Upsilon(1S)pi+pi-, Upsilon(2S)pi+pi-, and Upsilon(3S)pi+pi- as a function of sqrt{s} between 10.83 GeV 11.02 GeV. The data consists 8.1 fb^-1 collected with Belle detector at KEKB collider. observe enhanced in all three final states that does not agree well conventional Upsilon(10860) lineshape. A fit using Breit-Wigner resonance shape yields peak mass [10888.4 +2.7/-2.6 (stat) +- 1.2 (syst)] MeV/c^2 width [30.7 +8.3/-7.0 3.1 MeV/c^2.
This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|{V}_{cb}|$ from decay ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ using $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ Belle data collected near $\ensuremath{\Upsilon}(4S)$ resonance. We simultaneously measure product form factor normalization $\mathcal{F}(1)$ and as well three parameters ${\ensuremath{\rho}}^{2}$, ${R}_{1}(1)$...
Belle II is an experiment operating at the intensity frontier. Over next decades, it will record decay of billions bottom mesons, charm hadrons, and tau leptons produced in 10 GeV electron-positron collisions SuperKEKB high-luminosity collider KEK. These data, collected low-background kinematically known conditions, allow us to measure hundreds parameters that test standard model (SM) probe for existence new particles, mass scales orders magnitudes higher than those studied energy We project...
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 high energy-electron energy loss spectroscopy, transmission electron microscopy, and synchrotron-radiation-based x-ray absorption we provide the first experimental evidence that Russell-Saunders (LS) coupling fails for 5f states of Pu. These results support assumption only use jj or intermediate is appropriate High spectroscopy experiments were performed by a microscope are coupled with image diffraction data; therefore, measurements completely phase specific.
The self-irradiation damage generated by alpha decay of Pu results in the formation lattice defects and helium uranium atoms. Over time, microstructural evolution as a result may influence physical mechanical properties material. Transmission electron microscopy investigations Pu–Ga alloys ranging age up to 42 years old, reveal presence nanometre-sized bubbles. number density bubbles average size have been determined for eight different materials. nucleation growth these modelled with rate equations.