About

Most of the visible mass of the universe is composed of protons and neutrons---particles which build up the cores of atoms. However, the protons and neutrons (nucleons) are themselves composed of more fundamental particles known as quarks and gluons and interestingly, these small constituents appear to be forever trapped inside their respective parent. An article in an August 2000 issue of the New York Times listed understanding confinement of quarks inside of protons and neutrons as one of the ten fundamental questions in physics to ponder for the 'next millennium or two'. While we believe that the theory of Quantum Chromodynamics, (QCD), can explain this confinement, an exact understanding of how QCD works has been extremely elusive. We know that QCD works under the extreme conditions found in high energy particle collisions, but our knowledge of what it is doing under normal conditions found in the every day world is quite limited. Using advances in high speed computing and experime

Research topics

• Nuclear physics
• Particle physics
• Optics
• Physics
• Astronomy

Selected publications

• Strange Hadron Spectroscopy with Secondary KL Beam in Hall D

  arXiv (Cornell University) · 2020 · 17 citations

  • Nuclear physics
  • Physics
  • Particle physics

  We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF electron beam will enable a flux on the order of $1\times 10^4~K_L/sec$, which exceeds the flux of that previously attained at SLAC by three orders of magnitude. The use of a deuteron target will provide first measurements ever with neutral kaons on neutrons. The experiment will measure both differential cross sections and self-analyzed polarizations of the produced $Λ$, $Σ$, $Ξ$, and $Ω$ hyperons using the GlueX detector at the Jefferson Lab Hall D. The measurements will span CM $\cosθ$ from $-0.95$ to 0.95 in the range W = 1490 MeV to 2500 MeV. The new data will significantly constrain the partial wave analyses and reduce model-dependent uncertainties in the extraction of the properties and pole positions of the strange hyperon resonances, and establish the orbitally excited multiplets in the spectra of the $Ξ$ and $Ω$ hyperons. Comparison with the corresponding multiplets in the spectra of the charm and bottom hyperons will provide insight into he accuracy of QCD-based calculations over a large range of masses. The proposed facility will have a defining impact in the strange meson sector through measurements of the final state $Kπ$ system up to 2 GeV invariant mass. This will allow the determination of pole positions and widths of all relevant $K^\ast(Kπ)$ $S$-,$P$-,$D$-,$F$-, and $G$-wave resonances, settle the question of the existence or nonexistence of scalar meson $κ/K_0^\ast(700)$ and improve the constrains on their pole parameters. Subsequently improving our knowledge of the low-lying scalar nonet in general.

  DOI

Frequent coauthors

• D. I. Sober

  Ruhr University Bochum

  2 shared

• E. Pasyuk

  2 shared

• David Lawrence

  Thomas Jefferson National Accelerator Facility

  2 shared

• G. Niculescu

  2 shared

• H. Egiyan

  2 shared

• A. Ostrovidov

  2 shared

• D. P. Watts

  2 shared

• Gagik Gavalian

  Thomas Jefferson National Accelerator Facility

  2 shared

Labs

• Curtis Meyer LabPI

Education

• Ph.D., Physics

  University of California Berkeley

  1987

• MS, Physics

  University of California Berkeley

  1984

• BS, Mathematics

  Oregon State University

  1982

• BS, Physics

  Oregon State University

  1982

Awards & honors

• Fellow, American Physical Society

Similar researchers at Carnegie Mellon University

• Dr. Heather Millerh-158
• Christos Nick Faloutsosh-137
• Rongchao Jinh-128
• Ignacio Grossmannh-117
• Neil Donahueh-116