Carnegie Mellon University

Reinhard A. Schumacher

Professor of Physics

Nuclear & Particle Physics
Quark Interaction Experiment
Wean Hall 8406

Lab Website

Prof. Reinhard Schumacher

Education & Professional Experience

Ph.D.: Massaschusetts Institute of Technology (1983)
B.S.: Case Western Reserve University (1978)

Professional Societies:
Fellow, American Physical Society


Curriculum Vitae

Professor of Physics, Carnegie Mellon University, 1999–
Indefinite Tenure, Carnegie Mellon University, 1995
Associate Professor, Carnegie Mellon University, 1993–99
Assistant Professor, Carnegie Mellon University, 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, as a practical matter, do not require the highest beam energies or luminosities, but do call for high-precision measurements using specialized equipment.

Currently, my main area of work is in the electromagnetic production of strange particles (kaons and hyperons). The production of strange-quark pairs via the well-known electromagnetic interaction gives us an avenue for refining our knowledge of baryon resonances, coupling constants, and polarization observables; the results are compared with modern quark models and with unitarized chiral perturbation theory. This work is being done at the Thomas Jefferson National Accelerator Facility (JLab). More exactly, my experimental work is done using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B and using the GlueX detector (GlueX) in Hall D at Jefferson Lab.

Selected Publications

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 et al., Spin and parity measurement of the Λ(1405) baryonPhysical Review Letters 112, 82004 (2014) 

K. Moriya et al., Differential photoproduction cross sections of the Σ0(1385), Λ(1405), and Λ(1520)Phys. Rev. C 88, 45201 (2013) 

K. Moriya et al., Measurement of the Σπ photoproduction line shapes near the Λ(1405)Phys. Rev. C 87, 35206 (2013) 

G Bernero, J Olitsky, R A Schumacher, Atmospheric dependence of the stopping cosmic ray muon rate at ground levelJ. Phys. G: Nucl. Part. Phys. 40, 65203 (2013) 

R. A. Schumacher, M. M. Sargsian, Scaling and resonances in elementary K+Λ photoproductionPhysical Review C 83, 025207 (2011)

R. Schumacher, Polarization in hyperon photo- and electro-productionThe European Physical Journal A 35, 299 (2008)

R. Bradford et al., First measurement of beam-recoil observables Cx and Cz in hyperon photoproductionPhysical Review C 75, 035205 (2007)

R. Bradford et al., Differential cross sections for γ+p→K++Y for Λ and Σ0 hyperonsPhysical Review C 73, 035202 (2006)

Reinhard Schumacher, The Rise and Fall of Pentaquarks in Experiments, AIP Conf. Proc. 842, 409 (2006).

J. McNabb et al., Hyperon photoproduction in the nucleon resonance regionPhysical Review C 69, 042201 (2004)

R. A. Schumacher, Strangeness production and other recent results from Hall B at Jefferson LabThe European Physical Journal A - Hadrons and Nuclei 18, 371 (2003)

B.A. Mecking et al., The CEBAF large acceptance spectrometer (CLAS)Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 503, 513 (2003)

More Publications:
ORCID  Researcher ID