Reinhard A. Schumacher
Emeritus Professor of Physics
Nuclear & Particle Physics
Quark Interaction Experiment
Wean Hall 8406
412-268-5177

Education & Professional Experience
Ph.D.: Massaschusetts Institute of Technology (1983)
B.S.: Case Western Reserve University (1978)
Professional Societies:
Fellow, American Physical Society
Professor of Physics, 一本道无码, 1999–
Indefinite Tenure, 一本道无码, 1995
Associate Professor, 一本道无码, 1993–99
Assistant Professor, 一本道无码, 1987–93
Post-doctoral Research: Paul-Scherrer Institute (Switzerland), 1983–87
Research Interests
Quark interaction physics explores sub-atomic particle systems at the boundary between the quark-gluon and meson-baryon descriptions of matter. The field addresses questions that do not require the highest beam energies or luminosities, but do call for high-precision measurements using specialized equipment. At Carnegie Mellon we have a large research group doing .
Currently, my main area of research is in the electromagnetic production of strange particles (kaons and hyperons). The production of strange-quark pairs via the well-known electromagnetic interaction is our avenue for refining understanding of baryon resonances, mesonic resonances, and various polarization observables. Experimental results are compared with modern quark models and unitarized chiral perturbation theory with the use of partial wave analysis. We seek evidence for particle states that fall outside the traditional quark model classification scheme on account of active gluonic configurations.
This work is being done at the . My experimental work is done using the CEBAF Large Acceptance Spectrometer in Hall B and using the GlueX detector in Hall D at Jefferson Lab.
Another research direction is using fMRI methods to study the encoding of scientific concept in the human brain, particularly those that do not have classical analogues. The neuroscience of advanced physics concepts in the brains of PhD Physicists versus young students can be compared, for example, to see their cognitive foundations and development during learning.
At Carnegie Mellon I teach a number of different courses, and this comprises a very important part of my work. Recently I have taught (Relativity and Quantum Physics) in the fall and in the spring. I have produced some less technical YouTube videos on physics topics, such as and .
Selected Publications
R. A. Mason, R. A. Schumacher, M. A. Just, The neuroscience of advanced scientific concepts ,
D. Ho, R. A. Schumacher, et al., Beam-Target Helicity Asymmetry for γ n → π- p in the N* Resonance Region (CLAS Collaboration)
R. Dickson, R. A. Schumacher, et al., Photoproduction of the f1(1285) meson (CLAS Collaboration)
K. Moriya et al., Spin and parity measurement of the Λ(1405) baryon,
K. Moriya et al., Differential photoproduction cross sections of the Σ0(1385), Λ(1405), and Λ(1520),
K. Moriya et al., Measurement of the Σπ photoproduction line shapes near the Λ(1405),
G Bernero, J Olitsky, R A Schumacher, Atmospheric dependence of the stopping cosmic ray muon rate at ground level,
R. A. Schumacher, M. M. Sargsian, Scaling and resonances in elementary K+Λ photoproduction,
R. Schumacher, Polarization in hyperon photo- and electro-production,
R. Bradford et al., First measurement of beam-recoil observables Cx and Cz in hyperon photoproduction,
R. Bradford et al., Differential cross sections for γ+p→K++Y for Λ and Σ0 hyperons,
Reinhard Schumacher, The Rise and Fall of Pentaquarks in Experiments,
J. McNabb et al., Hyperon photoproduction in the nucleon resonance region,
R. A. Schumacher, Strangeness production and other recent results from Hall B at Jefferson Lab,
B.A. Mecking et al., The CEBAF large acceptance spectrometer (CLAS),
More Publications: