SFU DØ Homepage

We were an institutional member of D0 from 2003-2010. While we no longer contribute to D0, this page is still here as some sort of historical archive ;-) The physics results from our group were based around single top quark production. We did the BDT analysis for evidence and observation and the first search in the tau channel. Two grad students (Dag Gillberg and Zhiyi Liu) and one postdoc (Yann Coadou) passed through the group during that period as well as many undergrad students. Best wishes to all our D0 colleagues, we are off to ATLAS!

We contributed to DØ in four main areas:

Search for Single Top Quark Production. We found first evidence!
Calibrating the Jet Energy Scale
Trigger Studies
Grid Computing

Search for Single Top Production

The top quark was discovered in 1995 by the CDF and DØ collaborations. So far, we have only detected top quarks in pairs produced through the strong interaction. However, the Standard Model of Particle Physics also predicts the top quark to be produced singly through the electroweak interaction. We are involved in the search for this single top quark production.

An important part of this analysis is signal/backgroud separation. We are trying to improve this separation by the use of a method based on Decision Trees. For more information, see our Decision Tree page. This analysis lead to the first evidence for production of single top quarks and the first direct measurement of |V_tb|.

We are also preparing the single top analysis for the Common Analysis Format, CAF. For more information, see the top_cafe page, and our CAF page.

In this context we are also studying the identification criteria for forward jets.

Jet Energy Scale

The dominant physics process at Fermilab is jet production. A correct jet energy calibration is therfore very important for many physics analyses at DØ. We are working on improving this jet energy calibration. We are measuring the jet response in the DØ calorimeters from the transverse momentum imbalance in gamma+jet events.

Information on some of our work is available at our Jet Energy Scale Page. We also prepare the JES analysis for CAF.

Triggers

The DØ trigger is a complicated system requiring permanent attention and development in order to maximize the physics potential of the events collected by the detector. Any event that was not triggered on is lost forever, so it better be an uninteresting one. In order to check the validity of running trigger lists and to develop new trigger terms, we created the TrigSimCert package.

Grid Computing

We are reprocessing data recorded in the DØ detector using Westgrid. For more information, see our reprocessing page.