DZero milestone: 300th Run II publication submitted

DZero has now surpassed 300 publications submitted in Run II. The milestone paper is a comprehensive study of W boson-plus-jet production, pushing our understanding of quark interactions and, in turn, enabling the particle physics community to perform better measurements, including extracting properties of the Higgs boson.

Nine years after the DZero collaboration published their first measurement using Run II Tevatron data, they have now reached the milestone of submitting 300 Run II papers. Considering the amount of effort that goes into each measurement, this is a major achievement and highlights just how much the particle collider experiments at Fermilab have contributed to our understanding of the subatomic world.

The 300th measurement is in itself a landmark analysis, examining in great detail the properties of “W plus jets” events, in which a W boson is produced in conjunction with one or more high-energy particle “jets.” Such processes are very important in high-energy particle interactions and provide valuable information on the fundamental processes of quantum chromodynamics, which governs the binding of quarks into bound states such as protons and neutrons.

Perhaps more important still is that such W+jets events are a major background in studies of the Higgs boson, in measurements of top quark properties and in searches for hypothetical supersymmetry signatures. At the Tevatron, for example, for every Higgs boson produced in proton-antiproton collisions, there are many thousand W+jets events: These backgrounds must be understood with high precision in order to pick out the tiny signal. Any improvement in our W+jets models will therefore benefit many important measurements at the Tevatron, the LHC and future collider experiments.

Some of the numbers associated with “paper 300” are startling: From a sample of over two million W boson events, the production properties are examined as a function of more than 25 variables, with one-, two-, three- and four-jet events analyzed separately. For theorists and future experimenters, this represents a highly detailed database, guiding them to better measurements like a roadmap.

Of course, 300 is just a number, and the scientists at DZero didn’t stop to admire the view once the paper was submitted. In fact, the Run II submission tally has since reached 316, in addition to 132 papers submitted during Run I. We expect to submit many more in the coming year as we continue to cement the enduring legacy of the Tevatron program.

Mark Williams

The DZero collaboration, still going strong, consists of around 400 scientists from 72 institutions in 18 different countries.
The DZero experiment is a general-purpose detector, comprising many layers that combine to give a complete picture of the particle collisions. Shown here is one such sub-detector: the uranium and liquid-argon calorimeter, which captures almost all the particles produced in the original interaction and measures their energies. This is of great importance for any measurement of events containing particle jets, such as the W+jets paper.