Spin Effects in High Energy Scattering in a Simple Constituent Model

In this paper the author presents an overview of the evolution of proton‐proton spin physics over the past quarter century and describes recent work on interpreting high energy polarization effects in a constituent scattering model. © 2002 American Institute of PhysicsPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87462/2/201_1.pd

Terwilliger in the department and university

The contributions of Kent Terwilliger to the University of Michigan are recalled. As associate chair for research and facilities, Kent managed funding for research, oversaw the department shops as well as performing several other tasks.(AIP)Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87540/2/217_1.pd

A Teacher\u27s Trouble: Risk, Responsibility and Rebellion

What follows is an edited transcript of a session at the 1995 Annual Meeting of the Association of American Law Schools, held in New Orleans, Louisiana, January 7, 1995. The meeting was a joint plenary session of the AALS Section on Professional Responsibility and the Section on Clinical Legal Education. The meeting was planned and the role plays were written by Professors Margaret Martin Barry and Lisa Lerman of The Catholic University of America and Professor Homer La Rue of Howard University. The purpose of the program was to foster interaction among teachers of professional responsibility and clinical teachers about issues that arise in both clinical and non-clinical teaching. As Professor Sandy Ogilvy of Catholic University said in introducing the session, the planners wanted to bring together the perspective on the profession of the professional responsibility teachers, with the expertise in teaching methodology of the clinicians, with the thought that each group would be interested in what the other group had to say. Interesting ethical issues arise daily in clinical programs, and the planners wanted to encourage cross-fertilization between these two fields and increased collaboration within law schools between clinical teachers and teachers of professional responsibility. In developing the three role plays presented in this program, the planners selected issues that raise ethical or professional dilemmas for the law teachers as well as for their students. The transcript of this discussion explores only some of the issues potentially raised by the role play scenarios. The editors of the Clinical Law Review invite readers to submit commentary reacting to the issues raised in this discussion, or raising other issues suggested by the role plays but not fully discussed by the participants. The Review will consider such submissions for possible publication in its next issue. Readers might also consider initiating further dialogue with colleagues through one of the relevant internet listservs (lawclinic, legalethics or lawprof); such dialogue also may be submitted for possible publication

A Measurement of Rb using a Double Tagging Method

The fraction of Z to bbbar events in hadronic Z decays has been measured by the OPAL experiment using the data collected at LEP between 1992 and 1995. The Z to bbbar decays were tagged using displaced secondary vertices, and high momentum electrons and muons. Systematic uncertainties were reduced by measuring the b-tagging efficiency using a double tagging technique. Efficiency correlations between opposite hemispheres of an event are small, and are well understood through comparisons between real and simulated data samples. A value of Rb = 0.2178 +- 0.0011 +- 0.0013 was obtained, where the first error is statistical and the second systematic. The uncertainty on Rc, the fraction of Z to ccbar events in hadronic Z decays, is not included in the errors. The dependence on Rc is Delta(Rb)/Rb = -0.056*Delta(Rc)/Rc where Delta(Rc) is the deviation of Rc from the value 0.172 predicted by the Standard Model. The result for Rb agrees with the value of 0.2155 +- 0.0003 predicted by the Standard Model.Comment: 42 pages, LaTeX, 14 eps figures included, submitted to European Physical Journal

Search for the Standard Model Higgs Boson with the OPAL Detector at LEP

This paper summarises the search for the Standard Model Higgs boson in e+e- collisions at centre-of-mass energies up to 209 GeV performed by the OPAL Collaboration at LEP. The consistency of the data with the background hypothesis and various Higgs boson mass hypotheses is examined. No indication of a signal is found in the data and a lower bound of 112.7GeV/C^2 is obtained on the mass of the Standard Model Higgs boson at the 95% CL.Comment: 51 pages, 21 figure

Recycling MSW : results and conclusions of a forum

46, [18] leaves : ill. ; 28 cm. Includes bibliographical references.,from the brainstorming session results section, The principal objectives of the Forum were to review the recycling plans that are proposed and on-line for Long Island, to share the information about these programs and to share ideas for enhancing recycling on Long Island. We ended the Forum with a brainstorming session in which participants shared their ideas freely. The brainstorming session was patterned after the technique developed by Alex Osborne in the 1940s. The participants were given the following instructions. They were told to accept the proposition that recycling is an important and legitimate component of any comprehensive municipal solid waste program and that during this brainstorming session our objective was to provide as many responses as we could to the following statement: In how many ways can we enhance the effectiveness of recycling on Long Island. What follows is a complete and unedited listing of all of the ideas presented. The order in which they were offered has been preserved. .

Search for Yukawa Production of a Light Neutral Higgs Boson at LEP

Within a Two-Higgs-Doublet Model (2HDM) a search for a light Higgs boson in the mass range of 4-12 GeV has been performed in the Yukawa process e+e- -> b bbar A/h -> b bbar tau+tau-, using the data collected by the OPAL detector at LEP between 1992 and 1995 in e+e- collisions at about 91 GeV centre-of-mass energy. A likelihood selection is applied to separate background and signal. The number of observed events is in good agreement with the expected background. Within a CP-conserving 2HDM type II model the cross-section for Yukawa production depends on xiAd = |tan beta| and xihd = |sin alpha/cos beta| for the production of the CP-odd A and the CP-even h, respectively, where tan beta is the ratio of the vacuum expectation values of the Higgs doublets and alpha is the mixing angle between the neutral CP-even Higgs bosons. From our data 95% C.L. upper limits are derived for xiAd within the range of 8.5 to 13.6 and for xihd between 8.2 to 13.7, depending on the mass of the Higgs boson, assuming a branching fraction into tau+tau- of 100%. An interpretation of the limits within a 2HDM type II model with Standard Model particle content is given. These results impose constraints on several models that have been proposed to explain the recent BNL measurement of the muon anomalous magnetic moment.Comment: 24 pages, 9 figures, Submitted to Euro. Phys. J.

A measurement of the tau mass and the first CPT test with tau leptons

We measure the mass of the tau lepton to be 1775.1+-1.6(stat)+-1.0(syst.) MeV using tau pairs from Z0 decays. To test CPT invariance we compare the masses of the positively and negatively charged tau leptons. The relative mass difference is found to be smaller than 3.0 10^-3 at the 90% confidence level.Comment: 10 pages, 4 figures, Submitted to Phys. Letts.

First Measurement of Z/gamma* Production in Compton Scattering of Quasi-real Photons

We report the first observation of Z/gamma* production in Compton scattering of quasi-real photons. This is a subprocess of the reaction e+e- to e+e-Z/gamma*, where one of the final state electrons is undetected. Approximately 55 pb-1 of data collected in the year 1997 at an e+e- centre-of-mass energy of 183 GeV with the OPAL detector at LEP have been analysed. The Z/gamma* from Compton scattering has been detected in the hadronic decay channel. Within well defined kinematic bounds, we measure the product of cross-section and Z/gamma* branching ratio to hadrons to be (0.9+-0.3+-0.1) pb for events with a hadronic mass larger than 60 GeV, dominated by (e)eZ production. In the hadronic mass region between 5 GeV and 60 GeV, dominated by (e)egamma* production, this product is found to be (4.1+-1.6+-0.6) pb. Our results agree with the predictions of two Monte Carlo event generators, grc4f and PYTHIA.Comment: 18 pages, LaTeX, 5 eps figures included, submitted to Physics Letters