D Bauer, R Beuselinck, G J Davies, J Hassard, J Hays, P Jonsson

The Tevatron (at Fermilab near Chicago) was a proton-antiproton collider operating at 2TeV, it finished running in Autumn 2011. Till LHC operations it was the highest energy collider in the world. The group made leading contributions to the Trigger, Offline b-tagging and Computing as well as to the B- and Higgs Physics groups. As well as leadership of these activities, Davies was Chair of the Institute Board. Technical highlights with particular group involvement include the first use of the grid by a running experiment and the development of the first multivariate techniques for identifying b-quarks at a hadron collider. An early physics highlight is the 1st ever limits on the Bs oscillation frequency (2006). With the larger data sets the focus was on searching for the Higgs boson, exploiting the complementarity with LHC, coming through the Tevatron’s particular sensitivity to decays to fermions (in this case b-quarks). First evidence for such decays was achieved in 2012, see Fig. 1 below. Most recently the Tevatron has been able to place constraints on the spin of exotic Higgs bosons, again using the b-quark decays.

The p-value as a function of the Higgs boson mass
The p-value as a function of the Higgs boson mass, mH, for the background-only hypothesis. Also shown are the median expected values assuming a Standard Model Higgs signal is present, evaluated separately at each mH. The associated dark and light-shaded bands indicate the possible fluctuations in the experimental outcomes at the 1 and 2 standard deviation level

Further information
DØ home page
Tevatron New Phenomena & Higgs Working Group