Fermilab TodayThursday, February 12, 2004  
Thursday, February 12
1:30 p.m. Electrical/Electronics Safety Seminar - Curia II
Speaker: D. Robley, Fluke Corporation
Title: Digital Multimeter Safety Training Course: Learn How to Identify and Avoid Electrical Measurement Hazards
2:30 p.m Theoretical Physics Seminar - Curia II
Speaker: D. Rainwater, DESY
Title: Higgs Pair Production and the Higgs Potential
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over

Friday, February 13
3:30 p.m. Wine & Cheese - 2nd Flr X-Over

Thursday, February 12
Old Fashioned Tomato soup
Chicken parmigana w/pasta and marinara $3.50
Assorted gourmet sandwiches and panini $4.75
Baked tilapia w/a pineapple chipotle sauce and coconut cous cous $3.50
1/2 pound burger w/bacon, Thousand Island and pickles on grilled sourdough $4.75
Rustic chicken salad over wild greens w/fresh fruit $3.75

Eurest Dining Center Weekly Menu
Chez Leon
Weather Partly Cloudy 26º/12º

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Fermilab Wins Two Environmental Awards
Truck battery
Battery in the under-
carriage of one of the
lab's alternative-fuel
The DOE's Office of Science recently announced that Fermilab won two 2003 Pollution Prevention and Environmental Stewardship Accomplishment awards.

With an increase in the number of alternative-fuel vehicles and the installation of on-site refueling facilities, Fermilab saved over 10,000 gallons of petroleum in FY03. The Office of Science recognized George N. Davidson, Jeffrey W. Irvin, Gregory B. Mitchell, Brian K. Niesman, Randall G. Ortgiesen, and Jeffrey A. Sims for their commitment to the Fermilab Alternative Fuel Initiative.

Jose De La O, Anna Pla-Dalmau, Dale R. Wilderspin, Scott K. Borton, John J. Kelly, and Eric McHugh were recognized for their efforts in the Scintillator Plastic Recycling Program. The Plastic Scintillator Extrusion Line, installed in the spring of 2003, produces 3,000-6,000 pounds of waste a month. These workers recognized the problem and found a local vendor that could accept 100% of the waste plastic. Amy Pavnica, chair of Fermilab's Environmental Protection Subcommittee, calls this an example of "good old-fashioned recycling."

The honorees will be officially recognized at an awards ceremony in the Spring.

Plastic extrusion line
The Plastic Scintillator Extrusion Line (Click on image for larger version.)
Accelerator Update
February 9 - February 11
- Operations established one store during this period. That store along with an existing store, provided approximately 44 hours and 3 minutes of luminosity to the experiments.
- The I- Source suffered from sparking and trips
- Recycler took transfers of antiprotons View the current accelerator update
View the Tevatron Luminosity Charts

In the News
From Nature, February 12, 2004
Particle physics: Lattice window on strong force
By Ian Shipsey
A long-awaited breakthrough has been made in lattice quantum chromodynamics a means of calculating the effect of the strong force between sub-atomic particles that could, ultimately, unveil new physics.

The fundamental particles called quarks exist in atom-like bound states, such as protons and neutrons, that are held together by the strong force. The heavier varieties of quark, such as the bottom quark, can disintegrate to produce other, lighter particles, and the pattern of the decay rates is constrained, but not determined, in the theory of fundamental particles, the standard model. That pattern, especially the part involving the bottom quark, is sensitive to new physical phenomena. But although accurate measurements of the rates have been made, the window on new physics has been obscured. This is because the binding effect of the strong force between quarks modifies the decay rates: unless correction factors can be accurately worked out, the data cannot be fully interpreted for signs of any physics that is as yet unknown. This has been the case for almost 40 years. But at last, Davies et al. report an advance in lattice quantum chromodynamics, a method of calculating the effect of the strong force, that promises the calculational precision required (C. T. H. Davies et al. Phys. Rev. Lett. 92, 022001; 2004).
Read more

Fermilab Result of the Week
26 Theorists + Computer Clusters = Progress
in Lattice QCD

Result of the Week
The results of two sets of lattice calculations divided by experimental measurements. A value of 1 represents perfect agreement. (Click on image for larger version.)
Left: The old way of doing lattice QCD yields results that differ by 10 to 15% from experimental data.
Right: QCD calculations using improved staggered fermions give correct results for a wide variety of hadrons.
For nearly 30 years, theorists have tried to calculate properties of particles containing quarks directly from the basic equations of quantum chromodynamics (QCD). The most promising approach is called lattice gauge theory, but it requires a lot of computing power. So, starting in November 2000, Fermilab's Computing Division began to build clusters of PCs for lattice QCD. The clusters now contain 512 processors, which together are about 6 times faster than the lab's special-purpose ACPMAPS computer built in the 1980s.

Although computers are getting faster, until recently many theorists continued to use the so-called quenched approximation, a rather drastic simplification of QCD. Now 26 lattice gauge theorists-unusually many for a theory paper-have published evidence that a new method, called improved staggered fermions, allows them to scrap the quenched approximation, yielding much better results. Past lattice QCD calculations have agreed with experimental results within 10 to 15%. Although this is pretty good, such results are insufficient for precision measurements obtained by today's experiments. Using the new method, the 26 theorists have achieved agreement with experimental data for a wide variety of hadrons (see above graphic). Lattice theorists now begin to make precise predictions of future measurements of particle properties.

Peter Lepage
Peter Lepage,
Cornell University
The new lattice-QCD method was devised by Peter Lepage, at Cornell University, and the MILC Collaboration. Over the last several years MILC has devoted most of its computing resources at NSF and DOE supercomputer centers to calculations using improved staggered fermions. MILC's long-standing policy has been to make the fruits of their efforts freely available to other physicists, including their "competitors." Physicists at Cornell, Glasgow, and Ohio State have used the algorithms to calculate properties of hadrons containing bottom quarks, others - including Fermilab theorists Andreas Kronfeld, Paul Mackenzie, and Jim Simone - have investigated charmed particles.

Because the full range of results was far more impressive than any individual one, all 26 theorists joined forces and wrote one paper. Read a related story in Nature, which is also featured in today's issue of Fermilab Today.

MILC Collaboration
The MILC collaboration (left to right):(back row) Eric Gregory, Chris Aubin, Bob Sugar, Urs Heller, Jim Hetrick; (front row) Steve Gottlieb, Claude Bernard, Carleton DeTar, James Osborn, Doug Toussaint. (Click on image for larger version.)
Fermilab Lattice QCD theory group
Fermilab theorists (from left to right) Jim Simone, Andreas Kronfeld, and Paul Mackenzie, in front of Fermilab's first PC cluster for lattice QCD, installed in the New Muon Lab. (Click on image for larger version.)
Read more:
Physical Review Letters: High-Precision Lattice QCD Confronts Experiment
Nature: Particle physics: Lattice window on strong force
Result of the Week Archive

Fermilab's Gallery Chamber Series
The Fermilab Gallery Chamber Series will present the Baroque Trio Sonatas on Sunday, February 29 at 2:30 p.m. in the 2nd floor art gallery.
more information

Recreation Adult Outing
There will be a recreation adult outing on Saturday, February 21, 2003 at the Pheasant Run Resort & Spa. A buffet dinner will be followed by the play, "The Underpants," by Carl Sternheim; adaptation by Steve Martin; directed by Karen Kessler. The deadline to order tickets is January 26. Call or stop by the Recreation Office x5427, x2548 to pick up a brochure and registration form.
more information

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