[en] We examine the phenomenology of the W-Z mass difference as a function of the top quark mass and the Higgs mass. A detailed analysis is presented on how well the mass difference is measurable using the D0 detector at Fermilab. We show that the effective mass distribution of the Z⁰ is not a Breit-Wigner at the Tevatron and present techniques developed for the D0 detector simulation that can be used to reduce the systematic errors in measuring the W-Z mass difference. Scenarios are presented for the integrated luminosities of 10 pb^-1 and 100 pb^-1 at the Tevatron. It is shown that the Tevatron is competitive with LEP II for integrated luminosities of 100 pb^-1 in attainable precisions in this measurement. These considerations argue strongly for the pp option in the Tevatron upgrade program. 17 refs., 14 figs., 2 tabs

[en] We present results from searches for top quark production in p bar p collisions at the Tevatron collider based on an integrated luminosity of 7.5 pb^-1 obtained during the 1992--1993 ran. The present results are confined to decay modes where both the top and anti-top quarks in the event decay semi-leptonically to the ee and eμ channels. A lower limit of 103 (99) GeV/c² is obtained at 95% confidence level for the top quark mass from the absence of events consistent with standard model top quark decays with background subtraction (no background subtraction). We do however observe one event in the eμ channel which cannot be explained by the known backgrounds. While we make no claim that this event is due to top quark decay, it is not inconsistent with a top quark mass in the range 130--170 GeV/c²

[en] This article is based on a series of 5 lectures delivered at the Mexican School. It is intended as an introduction to the physics expected at the Fermilab anti p p collider, the Tevatron, and as such relies heavily on its extrapolative power on physics done at lower energies at the CERN ISR and s anti p ps. The lectures were delivered to graduate students and, where possible, the author has attempted to give derivations of the basic formulae. The lectures deal with minimum bias physics, QCD jets, W/Z production, Heavy Flavor production and exotic phenomena beyond the standard model, and each subject is covered in some detail from the experimentalist's point of view. 119 refs., 81 figs

[en] We demonstrate a new likelihood method for extracting the top quark mass from events of the type t anti t → bW⁺(lepton+ν)anti bW^-(lepton+ν). This method estimates the top quark mass correctly from an ensemble of dilepton events. The method proposed by Dalitz and Goldstein is shown to result in a systematic underestimation of the top quark mass. Effects due to the spin correlations between the top and anti-top quarks are shown to be unimportant in estimating the mass of the top quark

[en] We report on the physics capabilities of a linear e⁺e^- collider operating on or above the top quark threshold

[en] We present preliminary results for the search for the top quark in DO in the electron + jets channel where one of the b quark jets is tagged by means of a soft muon, using 13.5 pb^-1 of data. Standard model decay modes for the top quark are assumed. We present the resulting top cross section and error as a function of top mass using this channel combined with the dilepton channel and the untagged lepton + jets channel presented elsewhere in this session. At present, no significant signal for top quark production can be established

[en] In order to predict correctly the effects of cracks and dead material in a nearly hermetic calorimeter, hadronic and electromagnetic showers need to be simulated accurately on a particle by particle basis. Tracking all the particles of all showers in the calorimeter leads to very large CPU times (typically 5 hours on a VAX780) for events at √(s) = 2TeV. Parametrizing the energy deposition of electromagnetic particles in showers with energy below 200 MeV results in event times of the order of 1 hour on a VAX780. This is still unacceptably large. The D0 collaboration then employed a farm of 16 MicroVax II's to get acceptable throughputs. The calorimeter hit patterns of each individual track was output, to be summed up by a later job. These individual hit patterns were entered into a random access shower library file, which was then used for subsequent Monte Carlo simulations. This shower library technique results in further speed-ups of a factor of 60 without degrading the quality of simulation significantly

[en] We review the measurements of the top quark mass by the CDF and D0 collaborations using Run I data in excess of 1.00 pb^-1. The D0 collaboration has recently updated its measurement of the top quark mass in the lepton + jets channel. The world average of the top quark mass from the CDF and D0 measurements in the lepton + jets channel now stands at 175.6 ± 5.5 GeV/c²

[en] We discuss the physics case for a neutrino factory and present the status of the effort in the U.S in making the neutrino factory a reality. We present the results from the two feasibility studies done on the factory and describe the R and D activities in collecting, cooling and accelerating muons. A staged scenario in which a neutrino factory is realized step by step is presented

[en] The concept of a Muon Collider was first proposed by Budker [10] and by Skrinsky [11] in the 60s and early 70s. However, there was little substance to the concept until the idea of ionization cooling was developed by Skrinsky and Parkhomchuk [12]. The ionization cooling approach was expanded by Neufer [13] and then by Palmer [14], whose work led to the formation of the Neutrino Factory and Muon Collider Collaboration (MC) [3] in 1995. The concept of a neutrino source based on a pion storage ring was originally considered by Koshkarev [18]. However, the intensity of the muons created within the ring from pion decay was too low to provide a useful neutrino source. The Muon Collider concept provided a way to produce a very intense muon source. The physics potential of neutrino beams produced by muon storage rings was investigated by Geer in 1997 at a Fermilab workshop [19, 20] where it became evident that the neutrino beams produced by muon storage rings needed for the muon collider were exciting on their own merit. The neutrino factory concept quickly captured the imagination of the particle physics community, driven in large part by the exciting atmospheric neutrino deficit results from the SuperKamiokande experiment. As a result, the MC realized that a Neutrino Factory could be an important first step toward a Muon Collider and the physics that could be addressed by a Neutrino Factory was interesting in its own right. With this in mind, the MC has shifted its primary emphasis toward the issues relevant to a Neutrino Factory. There is also considerable international activity on Neutrino Factories, with international conferences held at Lyon in 1999, Monterey in 2000 [21], Tsukuba in 2001 [22], and another planned for London in 2002