B.A., Mount Allison
(1961); Ph.D., Johns Hopkins (1968). Research Associate, Stanford Linear Accelerator Center (1968-71); Assistant Professor, University of Toronto (1971-75); Associate Professor, (1975-80); Associate Chair, Graduate Studies (1983-87). Chair, Physics/Astronomy/CITA
Computing Consortium (1977-1990); Member,
American Physical Society (1966-present); Chair, CAP Particle Physics Division (1984); President, Royal Canadian Institute (1982-83); Council Member, Institute of Particle
In briefest terms, particle physics (or high energy physics, as it is usually called) deals with the study of the ultimate constituents of matter and the forces between them. Experimentally this study requires giant accelerators in order to probe the smallest possible distances and to provide the large energies for the search and study of new states of matter.
Production of charm quark hadron states with photon
beams and more recently with hadron beams at Fermilab provide the
possibility of precision lifetime measurements of these states and the
high statistics study of their properties via subsequent decays. New
silicon strip vertex detector technology has made this possible. By
means of these detectors the signal to noise ratio is greatly enhanced
and thus the intrinsic higher luminosity of fixed target experiments is
exploited. Until recently most of the charmed hadron information came
only from the cleaner but lower luminosity electron-positron colliders.
Precision measurements of the life-times and decay
modes of charm meson states enable one to try and separate out the
relative importance of the various diagrams in the dynamics of the
decay, such as the simple quark spectator diagrams, quark
annihilation diagrams, W boson exchange diagrams and final state
In addition, charm quark production provides an
opportunity to isolate the photon-gluon fusion QCD process and to test
QCD itself. The Fermilab tagged photon beam experiments have been
extremely productive in terms of new charm quark data and physics.
By its scale and intrinsic nature, experimental high
energy physics research is extremely computer intensive. In designing
experiments one requires large amounts of computer time to simulate the
experiment and the apparatus, well in advance of any data taking. The
subsequent on-line computer system is often state of the art, as is the
data analysis itself. To illustrate, the recent charm hadroproduction
experiment has generated 10,000 reels of data for analysis. To analyse
and extract the science in such a mammoth data base pushes both
hardware and software technology to the limit. As an offshoot to using
computers in high energy physics, I have also become interested in the
topic of research computing itself and have been active in a number of
initiatives, such as implementing advanced parallel systems.
``Measurement of elastic rho and phi meson photoproduction cross sections on protons from 30 to 180 GeV'', R.M. Egloff et al., Phys. Rev. Letters 43, 657 (1979).
``A recoil proton detector using cylindrical proportional chambers and scintillator counters'', G.F. Hartner et al., Nuclear Instruments and Methods 216, 410 (1983).
``Inelastic and elastic photoproduction of J/psi(3097)'', B.H. Denby et al., Phys. Rev. Letters 52, 795 (1984).
``Study of D0 - Dbar0 mixing'', J.C. Anjos et al., Phys. Rev. Letters 60, 1239 (1988).
``Measurement of D±s decays and Cabiboo-suppressed D± decays'', J.C. Anjos et al., Phys. Rev. Letters 60, 897 (1988).
``Measurement of the D0, D+, and D±s lifetimes'', J.R. Raab et al., Phys. Rev. Letters D37, 2391 (1988).
``Measurement of the lambda+c lifetime'', J.C. Anjos et al., Phys. Rev. Letters 60, 1379 (1988).
``Observation of excited charmed
mesons'', J.C. Anjos et al., Phys. Rev. Letters 62, 1717 (1989).
``Measurement of D±s and D± decays to nonstrange states'', J.C. Anjos et al., Phys. Rev. Letters 62, 125 (1989).