P. Mantsch
A5058359050- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Pulsars and Gravitational Waves Research
- Photocathodes and Microchannel Plates
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Atmospheric aerosols and clouds
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
Fermi National Accelerator Laboratory
2016-2025
Institute of Astronomy and Space Physics
2011-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2011-2023
Universidad Nacional de La Plata
2011-2023
University of Buenos Aires
2011-2023
Instituto de Tecnologías en Detección y Astropartículas
2016-2023
National Technological University
2016-2023
Institute of Scientific and Technical Research for Defense
2016-2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2021-2023
National University of General San Martín
2016-2023
The Sloan Digital Sky Survey (SDSS) will provide the data to support detailed investigations of distribution luminous and nonluminous matter in universe: a photometrically astrometrically calibrated digital imaging survey π sr above about Galactic latitude 30° five broad optical bands depth g' ∼ 23 mag, spectroscopic approximately 106 brightest galaxies 105 quasars found photometric object catalog produced by survey. This paper summarizes observational parameters products SDSS serves as an...
We describe the design, construction, and performance of Sloan Digital Sky Survey Telescope located at Apache Point Observatory. The telescope is a modified two-corrector Ritchey-Chretien design which has 2.5-m, f/2.25 primary, 1.08-m secondary, Gascoigne astigmatism corrector, one pair interchangeable highly aspheric correctors near focal plane, for imaging other spectroscopy. final ratio f/5. instrumented by wide-area, multiband CCD camera fiber-fed double spectrographs. Novel features...
We present photometric and spectroscopic observations of 15 high-redshift quasars (z > 3.6) discovered from ∼140 deg2 five-color (u', g', r', i', z') imaging data taken by the Sloan Digital Sky Survey (SDSS) during its commissioning phase. The are selected their distinctive colors in SDSS multicolor space. Four have redshifts higher than 4.6 = 4.63, 4.75, 4.90, 5.00, latter being highest redshift quasar yet known). In addition, two previously known z 4 objects were recovered data. all i* <...
This paper describes the discovery of seven dwarf objects spectral type `L' (objects cooler than latest M dwarfs) in commissioning imaging data taken by Sloan Digital Sky Survey (SDSS). Low-resolution spectroscopy shows that these have types from L0 to L8. Comparison SDSS and 2MASS photometry for several indicates presence significant opacity at optical wavelengths, perhaps due atmospheric dust. comparison also demonstrates high astrometric accuracy (better 1'' faint sources) both surveys....
We have studied the photoproduction of $\frac{J}{\ensuremath{\psi}}$ mesons on H, Be, Fe, and Pb targets using real photons at a mean energy 120 GeV. The ${p}_{T}^{2}$ spectra were used to separate coherent diffractive signals from incoherent signals. Parametrizing per-nucleus cross sections in terms power-law dependences, ${A}^{\ensuremath{\alpha}}$, we find that ${\ensuremath{\alpha}}_{\mathrm{coh}}=1.40\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.04$ for...
We present an analysis of the exclusive semileptonic decay mode ${D}^{0}$\ensuremath{\rightarrow}${K}^{\mathrm{\ensuremath{-}}}$${e}^{+}$${\ensuremath{\nu}}_{e}$. have measured ratio rates .11(syst), which corresponds to a ${D}^{0}$\ensuremath{\rightarrow}${K}^{\mathrm{\ensuremath{-}}}$${e}^{+}$${\ensuremath{\nu}}_{e}$ branching fraction (3.8\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.6)%. Combining our result with measurement ${D}^{0}$ lifetime, we find...
Inelastic and elastic Jψ photoproduction on hydrogen are investigated at a mean energy of 105 GeV. The inelastic cross section with EψEγ<0.9 is significantly lower than the corresponding result for muoproduction iron targets, but consistent second-order perturbative QCD calculation.Received 9 November 1983DOI:https://doi.org/10.1103/PhysRevLett.52.795©1984 American Physical Society
The decay ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{e}^{+}{\ensuremath{\nu}}_{e}$ has been studied in the Fermilab photoproduction experiment E691. ratio of branching ratios, $\frac{B({D}^{+}\ensuremath{\rightarrow}{\overline{K}}^{*0}{e}^{+}{\ensuremath{\nu}}_{e})}{B({D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+})}$, is found to be 0.49\ifmmode\pm\else\textpm\fi{}0.04 \ifmmode\pm\else\textpm\fi{}0.05,...
We present a study of ${D}^{0}$ mixing using events the type ${D}^{\mathrm{*}+}$\ensuremath{\rightarrow}${\ensuremath{\pi}}^{+}$${D}^{0}$, with ${D}^{0}$\ensuremath{\rightarrow}${K}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ and ${D}^{0}$\ensuremath{\rightarrow}${K}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$. The decay time is used to separate from doubly Cabibbo-suppressed decays. observe no evidence for...
Using the Tagged Photon Spectrometer and a high-energy photon beam, we have searched for excited states of charm in Fermilab experiment E691. We found evidence state mass 2459±3 (stat.) ±2 (syst.) MeV/c2 width 20±10±5 which decays to D+π−. The fraction D+ coming from D**0(2459) is 0.07±0.02±0.02. also confirm D**0(2420)→D*+π− decay observed previously e+e− experiments present its charged counterpart.Received 22 September 1988DOI:https://doi.org/10.1103/PhysRevLett.62.1717©1989 American...
We have measured the lifetimes of ${D}^{0}$, ${D}^{+}$, and ${D}_{s}^{+}$ mesons which were produced by a high-energy photon beam incident on beryllium. Using Fermilab Tagged Photon Spectrometer with silicon-microstrip vertex detector we collected ${10}^{8}$ events from extracted about 4200 ${D}^{0}$ decays in ${K}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\pi}}^{+}$ ${K}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\pi}}^{+}$...
Using the data from Fermilab experiment 691, we have observed signals for decays ${{D}_{s}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${D}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ analyzed these modes fraction due to ${\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ ${f}_{0}(975){\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$. In addition, searched...
Decays of the ${D}^{0}$ meson to ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ and ${\overline{K}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${D}^{+}$ ${K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ have been analyzed for resonant substructure. We present results on amplitudes phases each decay mode compare with other measurements. confirm highly nonresonant nature decays. There is general agreement theoretical models branching...
We measure the relative cross sections for D mesons produced in interactions of ${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$ and ${\mathrm{\ensuremath{\pi}}}^{+}$ beams with targets Be, Cu, Al, W. The measurement is based on 1400 fully reconstructed decays types ${\mathit{D}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{+}$,...
We present results on the photoproduction of 10 000 charmed particles from ${10}^{8}$ recorded triggers Fermilab experiment E691. The total cross section for ${D}^{0}$ and ${D}^{+}$ (and antiparticles) ${x}_{F}>0.2$ is measured to be 3.88\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.40 \ensuremath{\mu}b/Be nucleus at $〈{E}_{\ensuremath{\gamma}}〉=145$ GeV. have also relative production different particles, their ${p}_{T}^{2}$ ${x}_{F}$ distributions, energy dependence charm...
We report on a Dalitz-plot analysis of 250 ${\mathit{D}}^{\ifmmode\pm\else\textpm\fi{}}$ and 290 ${\mathit{D}}_{\mathit{s}}^{\ifmmode\pm\else\textpm\fi{}}$ decays into ${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$. measure the relative rate for each charmed meson decaying \ensuremath{\varphi}${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$,...
We have studied $\ensuremath{\rho}\ensuremath{-}\ensuremath{\omega}$ interference in di-pion photoproduction the energy range 5-7 GeV with a total of 630 000 pion pairs from hydrogen, carbon, and lead. The mass spectra show clear vicinity $\ensuremath{\omega}$ mass. A branching ratio...
We measure the differential cross section with respect to Feynman-x (xF) and transverse momentum (PT) for charm meson production using targets of Be, Al, Cu, W. In range 0.1<xF<0.7, dσ/dxF is well fit by form (1-xF)n n=3.9±0.3. The difference between n values D− D+ 1.1±0.7. However, we find an asymmetry 0.18±0.06 favoring compared D+. lower PT range, <2 GeV, dσ/dP2T exp(-b×P2T) b=1.03±0.06 GeV−2, while in higher 0.8 3.6 it exp(-b’×PT) b’=2.76±0.08 GeV−1. shape has no significant dependence...
We have used a silicon-microstrip vertex detector with Tagged Photon spectrometer to measure the lifetimes of charmed mesons produced by high-energy photon beam at Fermilab. The D+ lifetime, based on 969 D+→K−π+π+ decays, is measured be (1.06±0.05±0.03)×10−12 s. Using 1360 D0 decays into modes K−π+ and K−π+π−π+, we determine lifetime (0.435±0.015±0.010)×10−12 ratio τ(D+)/τ(D0) obtained from these two measurements 2.44±0.14±0.08.Received 14 October...
Photoproduction of $\ensuremath{\phi}$ mesons from hydrogen and carbon was studied at 5.2 GeV by observing $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ decays. The results show that $\ensuremath{\phi}$'s are produced diffractively with a $\ensuremath{\phi}$-nucleon cross section ${\ensuremath{\sigma}}_{\ensuremath{\phi}N}={9.8}_{\ensuremath{-}3.3}^{+2.9}$ mb. In addition, 80 000 pion pairs were measured to search for the $G$-parity-nonconserving decay...
The real part of the forward amplitude for Compton scattering on protons was measured through interference between and Bethe-Heithler amplitudes by detecting zero-degree electron pairs asymmetrically. measurement made at an average photon energy $〈k〉=2.2$ GeV, momentum transfer to recoil proton $〈t〉=\ensuremath{-}0.027$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. result confirms prediction Kramers-Kronig relation.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation A. Devred, T. Bush, R. Coombes, J. DiMarco, C. Goodzeit, Kuzminski, M. Puglisi, P. Radusewicz, Sanger, Schermer, G. Spigo, Thompkins, Turner, Z. Wolf, Y. Yu, H. Zheng, Ogitsu, Anerella, Cottingham, Ganetis, Garber, Ghosh, Greene, Gupta, Herrera, S. Kahn, E. Kelly, Meade, Morgan, Muratore, Prodell, Rehak,...