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Reinhard A. Schumacher
Professor of Physics, Carnegie Mellon University
Ph.D., Massachusetts Institute of Technology (1983)
B.S., Case Western Reserve University (1978)
Email:
schumacher@cmu.edu
Office: Wean Hall, Room 8406
Phone: 1-412-268-5177
Department of Physics
Carnegie Mellon University
Pittsburgh, PA 15213-3890
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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
Nuclear and Quark Interaction Physics.
My main area of research is in the electromagnetic
production of strange particles (kaons and hyperons) and various baryon-antibaryon pairs. The production
of strange-quark pairs via the well-known electromagnetic interaction
is our avenue for refining understanding of baryon resonances,
mesonic resonances, and associated 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 Thomas Jefferson National
Accelerator Facility. My experimental work is done using the
GlueX detector (GlueX) in Hall D at Jefferson Lab
and (formerly) the
CEBAF Large Acceptance Spectrometer (CLAS) in Hall B.
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 trace their cognitive foundations and development during learning.
At Carnegie Mellon I taught a number of different courses, and this
comprised a very important part of my work before moving to emeritus faculty status. I taught
Modern Essentials (33.211) (Relativity and Quantum Physics) in the fall and
Modern Physics Laboratory (33.340) in the spring.
I also produced some didactic YouTube videos on physics topics, such as
A Diffusion Cloud Chamber and
The Kelvin Water Dropper with Electroscope.
Selected Publications
- R. A. Mason, R. A. Schumacher, M. A. Just,
The neuroscience of advanced scientific concepts ,
npj Science of Learning 6, 29 (2021).
- D. Ho, R. A. Schumacher, et al.,
Beam-target helicity asymmetry for γ n → π- p in the N* resonance region (CLAS Collaboration),
Physical Review Letters 118, 242002 (2017).
- R. Dickson, R. A. Schumacher, et al.,
Photoproduction of the f1(1285) meson (CLAS Collaboration),
Physical Review C 93, 065202 (2016).
- K. Moriya, R. A. Schumacher, et al.,
Spin and parity measurement of the Λ(1405) baryon (CLAS Collaboration),
Physical Review Letters 112, 082004 (2014).
- K. Moriya, R. A. Schumacher, et al.,
Differential photoproduction cross sections of the Σ(1385), Λ(1405), and Λ(1520) (CLAS Collaboration),
Physical Review C 88, 045201 (2013).
- K. Moriya, R. A. Schumacher, et al.,
Measurement of the Σπ photoproduction line shapes near the Λ(1405) (CLAS Collaboration),
Physical Review C 87, 035206 (2013).
- G. Bernero, J. Olitsky, and R. A. Schumacher,
Atmospheric dependence of the stopping cosmic ray muon rate at ground level,
Journal of Physics G 40, 065203 (2013).
- R. A. Schumacher and M. M. Sargsian,
Scaling and resonances in elementary K+Λ photoproduction,
Physical Review C 83, 025207 (2011).
- R. A. Schumacher and B. Tarbet,
A short Foucault pendulum free of ellipsoidal precession,
arXiv:0902.1829 [physics.class-ph] (2009).
- R. Schumacher,
Polarization in hyperon photo- and electro-production,
The European Physical Journal A 35, 299 (2008).
- R. Bradford, R. A. Schumacher, et al.,
First measurement of beam-recoil observables Cx and Cz in hyperon photoproduction (CLAS Collaboration),
Physical Review C 75, 035205 (2007).
- R. Bradford, R. A. Schumacher, J.W.C. McNabb, L. Todor, et al.,
Differential cross sections for γ+p→K++Y for Λ and Σ0 hyperons (CLAS Collaboration),
Physical Review C 73, 035202 (2006).
- R. A. Schumacher,
The rise and fall of pentaquarks in experiments,
AIP Conf. Proc. 842, 409 (2006).
- J. McNabb, R. A. Schumacher, L. Todor, et al.,
Hyperon photoproduction in the nucleon resonance region (CLAS Collaboration),
Physical Review C 69, 042201 (2004).
- B.A. Mecking, et al.,
The CEBAF large acceptance spectrometer (CLAS) (CLAS Collaboration),
Nuclear Instruments and Methods in Physics Research, Section A 503, 513 (2003).
- Stephan A. Roth and Reinhard A. Schumacher,
A computer-controlled tension monitoring system for drift chamber wires,
Nuclear Instruments and Methods in Physics Research Section A 369, 215 (1996).
- Reinhard A. Schumacher,
Special relativity and the Michelson-Morley interferometer,
American Journal of Physics 62, 609 (1994).
- Reinhard A. Schumacher,
Possible violation of the ΔI = 1/2 Rule in non-mesonic hypernuclear weak decay,
Nuclear Physics A 547, 143 (1992).
- R.A. Schumacher, P.A. Amaudruz, C.H.Q. Ingram, et al.,
Exclusive quasi-deuteron absorption of pions on 16O and 18O at 116 MeV,
Phys.Rev. C38, 2205-2220 (1988).
- R.A. Schumacher, J.L. Matthews, W.W. Sapp, R.S. Turley, G.S. Adams, R.O. Owens,
Two-body photodisintegration of 4He in the 100 MeV - 360 MeV region,
Phys. Rev. C33, 50-58 (1986).
- R.A. Schumacher, G.S. Adams, D.R. Ingham, J.L. Matthews, W.W. Sapp, R.S. Turley, R.O. Owens, B.L. Roberts,
Cu(γ, p)X reaction at Eγ = 150 MeV and 300 MeV,
Phys.Rev. C25, 2269-2277 (1982).
- E. R. Kinney, J. L. Matthews, W.W. Sapp, R.A. Schumacher, R.O. Owens,
A simple light guide for coupling to thin scintillator sheets,
Nuclear Instruments and Methods 185, 189 (1981).
Click here for a longer publication list.
Selected Videos
Selected Talks
Schumacher Group PhD Students
Many students have been a part of the Carnegie Mellon Experimental Medium Energy Nuclear/Particle Group over the years
Google Scholar Citations
Last modified: 10-31-2024 o