Arnold Engler

Emeritus Professor, Physics

Education

Ph.D., University of Berne

Research

Among the most important questions, in physics are the properties and the interactions of the three families of particles. The Colliding Beams group at Carnegie Mellon has over the past 16 years participated in the construction and operation of a giant detector to address this question. This detector, the largest of its kind, is situated at the LEP Collider at CERN, straddling the border between France and Switzerland, near Geneva. The observation that only three particle families exist has been answered by this detector. We have also studied in great detail the properties of the Z^o, the neutral Intermediate Vector Boson.  We have also studied the properties of the charged Intermediate Vector Bosons W⁺ and W^-.  The LEP detector is currently being dismantled to make room for the LHC, a new proton proton collider at CERN to search for the Higgs Boson.  Our group is participating in the design of a new detector to look for the Higgs particle.

Selected Publications

• L3 Collaboration:  M. Acciarri et al., Search for Charginos and Neutralinos in e⁺e^- collisions at √s̅ = 189 GeV, Physics Letters B 472, 420 (2000).
• L3 Collaboration:  M. Acciarri et al., Search for Excited Leptons at √s̅ = 189 GeV, Physics Letters B 473, 177 (2000).
• L3 Collaboration:  M. Acciarri et al., Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays, Physics Letters B 476, 243 (2000).
• L3 Collaboration:  M. Acciarri et al., Direct Observation of Longitudinally Polarised W⁺ Bosons., Physics Letters B 474, 194 (2000).
• L3 Collaboration:  M. Acciarri et al., Measurement of Hadron and Lepton-Pair Production at 130 GeV < √s̅ < 189 GeV at LEP, Physics Letters B 479, 101 (2000).