Professor Chapman’s research specialty is Experimental High Energy Physics. In recent years, research results in this field have led to increased confidence in the Standard Model of weak, electromagnetic, and strong interactions. Currently, the experimental challenges are split between further refinements of the parameters of the model and searches for phenomenon not described by the model.
Professor Chapman is participating in the study of anti-proton proton interactions in the CDF detector at Fermilab as the detector again begins data taking for Run II. The completely rebuilt muon trigger electronics, for which Professor Chapman is responsible, is in place and is performing to specifications. There are two Michigan designed custom integrated circuits and numerous PC boards in this system.
At CDF, the University of Michigan group is focusing on ElectroWeak and heavy flavor physics with students preparing thesis on W and X boson measurements and on top quark cross sections and mass measurements. CDF data for Run II is being collected at an everincreasing rate.
U-M Physics is a major contributor to the ATLAS Experiment at the LHC both for the preparation of drift chambers (called the Monitored Drift Tubes or MDT) of the endcap muon detector and for the electronics instrumentation that will process data from all MDT chambers. This work is well underway with a new, fast readout multiplexer prototype. Production electronics fabrication is underway. When completed, the electronics will be attached to chambers at institutions in the U.S., Italy, Germany, Greece, and Russia. In all, some 400,000 channels of custom electronics will be built and tested.
Data Flow Simulations through the ATLAS Muon Front-End Electronics, (J. Chapman, et. al.), Proceedings of the Fifth Workshop on Electronics for LHC Experiments, Snowmass, CO (1999).
Measurement of the tt Production Cross Section in pp Collisions at sqrt (s)=1.8 TeV, (The CDF Collaboration), Phys. Rev. Lett. 80, 2773, (1998).
Measurement of the Top Quark Mass, (The CDF Collaboration), Phys. Rev. Lett. 80, 2767, (1998).