The DØ Experiment at Fermilab  

The D0 experiment runs at the Fermilab Tevatron Collider located near Chicago, IL. The Tevatron accelerator provides proton, anti-proton collisions at an energy of 2 TeV. The first data taking period was from 1992 to 1996, and a second data taking period began in 2001 and is still continuing. Stony Brook was one of the founding institutions of D0. We have built major pieces of the apparatus and carried out research in almost all areas in which D0 has published results from QCD, through B physics, top quark and W boson measurements and searches for hypothetical new particles.

FPS detector element built by SBU and BNL (and shown in the Museum of Modern Art)
Physics Positions held by SBU faculty and post docs:
    physics coordinator
    Electroweak group convener
    B physics group convener
    Higgs group convener
    Search group convener
    QCD group convener
Students and post docs have also won research awards
Electronics built at Stony Brook used for real-time identification of Higgs boson decays

Our current DØ research centers around Higgs boson searches and the related topic of W boson mass measurement.
The Higgs boson is the only particle predicted by the standard model which has not been observed by any experiment. D0 (with our friendly competitors, CDF), has just released a new result with the first Higgs exclusion limits since the end of LEP running.

A major ingredient in this result was recently published as Phys. Rev. Lett. 104, 061804 (2010).
Measuring consistency between Standard model predictions and results from experiments can be used to set limits on Higgs boson mass. The limiting factor in this constraint is the precision of the measured W boson mass. Stony Brook plays a major role in this work. A recent paper by DØ Phys. Rev. Lett. 103, 141801 (2009) is the world’s most precise W boson mass measurement and is shown below. SBU D0 Group, ca 2014: (left-to-right) Paul Grannis, Bob McCarthy, Dean Schamberger, John Hobbs, Dmitri Tsybychev, Rafael Lopes de Sa, Michael Rijssenbeek (at SBU)
SBU D0 Group (continued), ca 2014: (left-to-right) Junjie Zhu, Katy Tschann-Grimm, Dan Boline, Subhendu Chakrabarti (at FNAL)

Stony Brook DØ Run II Ph.D. Theses
Year Student Thesis Title
2013 R. Lopes de Sa Measurement of the W boson mass with the D0 detector
2012 W. Ye Search for the stndard model Higgs boson at D0 in the mu+tau(hadrons) + 2 jets final state
2010 K. Tschann-Grimm Search for the standard model Higgs boson at D0 in the final state with two taus and two jets
2009 F. Guo Ratio method of measuring the W boson mass
2009 J. Guo A precision measurement of the W boson mass
2009 E. Strauss From ZZ to ZH: How low can these cross sections go, or everybody, let's cross section limbo
2008 K. Herner Search for neutral higgs boson decaying to tau pairs producted in association with b-quarks
2007 H. Dong Search for the standard model higgs boson in the ZH to mumu channel
2006 S. Desai A search for the production of technicolor particles at the DØ detector
2005 Y. Mutaf Measurement of the ratio σ(ppbar to Z+bjet)/σ(ppbar to Z+jet)
2004 Z. Wang Search for chargino and neutralino pair production
2004 M. Zdrazil Search for doubly-charged higgs boson production in the decay H+H- to mu mu mu mu
2002 A. Patwa Forward Preshower System and Study of the J/psi trigger
and 16 earlier theses, the first one in 1989 (Behnke)

Opinions expressed through this page are those of the hadron collider experiments group, and do not reflect those of the State University or the State of New York.