Beyond Run II

Run II promises a rich and varied physics program at D0. However, there remains much interesting high-pT physics which will require integrated luminosities an order of magnitude larger, ~ 10-30 fb-1. As an example, it has recently been suggested that it may be possible to observe light and intermediate mass Higgs bosons at the Tevatron collider, given sufficient integrated luminosity. Preliminary studies [19] indicate that the mass range 80 < m(h) < 130 GeV may be accessible for integrated luminosities L ~ 10 fb-1. This mass range is of great interest, since minimal supersymmetric versions of the standard model almost always predict a light Higgs boson lying in this region. The possibility therefore exists of either discovering, or refuting, this whole class of models.

The channels of interest are (W/Z)h with W/Z -> leptons and h -> bbar b, and W/Z -> jets and $h -> tau+ tau-. The reconstruction techniques needed for a Higgs discovery --- jet-jet spectroscopy using b-tagging information --- are similar to, and will benefit from, the high-statistics study of top quark production. In order to accumulate sufficient statistics, operation at luminosities higher than that currently envisaged for Run II would be desirable. We have made a preliminary study of triggering and data acqisition at L = 2*10**33 cm-2 s-1, [20], and find no insuperable obstacles to triggering on and recording these Higgs final states. Of course, such physics is properly beyond the scope of the present Upgrade; it is mentioned in order to emphasize that high-pT physics at the Tevatron will remain of interest beyond Run II, and it is our belief that further luminosity increases are in fact desirable in order to fully exploit the physics opportunities. The upgraded detector described in this report provides a solid foundation for any additional enhancements that may be needed to meet the challenge of increased luminosity.

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