Fermilab Today Thursday, July 2, 2009

Have a safe day!

Thursday, July 2
2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Kirill Melnikov, Johns Hopkins University
Title: Generalized Unitarity and W+3 Jet Production at the Tevatron
3:30 p.m.
4 p.m.
Accelerator Physics and Technology Seminar - One West
Speaker: Jim Strait, Fermilab
Title: LHC Status

Friday, July 3
Happy Independence Day Weekend!

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a weekly calendar with links to additional information.


Take Five
Tune IT Up



Mostly sunny

Extended Forecast
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Secon Level 3

Wilson Hall Cafe

Thursday, July 2
- Minnesota wild rice w/ chicken
- Tuna melt on nine grain
- Italian meatloaf
- Chicken casserole
- Buffalo crispy chicken wrap
- Assorted sliced pizza
- *Mandarin chicken

*Carb restricted alternative

Wilson Hall Cafe Menu

Chez Leon

Thursday, July 2
- Fresh mozzarella, tomato & basil salad
- Crusted shrimp w/ saffron sauce
- Latin fried rice
- Pineapple upside cake

Chez Leon Menu
Call x3524 to make your reservation.


Fermilab Today
Result of the Week
Safety Tip of the Week
User University Profiles
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University Profile

University of Minnesota Duluth

Left to right: Ryan Trogstad, Cody Rude, Rik Gran, Alec Habig, Jordan Heaton and Emily Draeger in the electronics laboratory at the University of Minnesota Duluth. Photo by Brett Groehler.

University of Minnesota Duluth

Duluth, Minnesota


Maroon and gold



Two professors and about a dozen master's and undergraduate students


MINOS detectors construction and operation, MINOS cosmic ray and neutrino cross-sections analyses, MINERvA test beam and NOvA DAQ.

Neutrino detection, particle astrophysics and neutrino interactions.

Being a primarily undergraduate institution doing experimental high-energy physics. Younger students get a lot of experience and make valuable contributions before they even get to a Ph.D. program.

National Science Foundation


View all University profiles


DZero analyzes efficiency

DZero collaborators enjoy a break between sessions during last week's collaboration meeting.

Each summer, hundreds of members of the DZero collaboration gather together to discuss the detector's progress and future plans. This year, the gathering had a special focus: optimizing DZero. It focused on getting more information out of the data than out of the detector.

With the Tevatron poised to run through 2011, Fermilab's two detectors, CDF and DZero, would extend their data collection runs. To do that, the collaboration would need to collect data more efficiently for a longer period of time. Doing that is no simple task.

"We're looking to improve the collaboration from the point at which data is collected all the way through to the final result. We want to find the best way to take data, analyze it and do physics with it," said Marjorie Corcoran, DZero collaboration meeting program committee chair and Rice University physics professor.

The meeting's 35 hours of parallel talks and 12 hours of plenary sessions included speakers from practically every collaborating group.

"When we set out to create the agenda, we wanted to make sure there were many opportunities for participants to interact and share ideas," Corcoran said.

On Thursday, collaborators began to analyze the meeting in a summary session and discuss ways to improve meetings for the coming years. Even after the talks ended, people congregated at the tables in the cafeteria to continue to discuss meeting topics.

"This year's summer meeting was a big opportunity for cross fertilization of ideas from different parts of the collaboration," said Darien Wood, DZero co-spokesperson and physics professor from Northeastern University. "And we are enthusiastically looking forward to really taking advantage of the Tevatron's extended run."

-- Tia Jones

In the News

Asia: One reason America can't afford to jettison good teachers

From Science News, June 17, 2009

I just listened to a disturbing news story on National Public Radio, this morning, about how budget cuts may force a Los Angeles middle school to fire half of its teachers. The riffed staff - reported to be mostly young, passionate and well educated - will be replaced with more senior teachers who had initially turned down a chance to teach at this innovative start-up (but who will now come anyway after losing their jobs at other LA. schools).

One anecdote that pointed to the school's inventive approach to turning low-income inner-city kids on to math: a staff-written horror video starring the seventh-grade faculty. A "crazed kidnapper named Pythagoras" gives ransom messages that can be solved only through the use of math. The kids loved the story - and the Pythagorean Theorem became indelibly etched into their gray matter.

I can understand California's budgetary dilemma, but the problem is that the real losers when schools sideline good teachers - young or old, new or experienced - is always our children. And can we really afford to jettison caring, passionate and well-trained educators at a time like this?

Read more

Fermilab Result of the Week

Topping off a search for new particles

The top-antitop invariant mass spectrum in the all-jets final state channel. The points represent the data and the colored histograms show the Standard Model expectation.

Since its discovery more than a decade ago, the top quark has played a major role in the Tevatron's physics program. That role has recently expanded since scientists from the CDF experiment used the all-hadronic decay of top quark pairs to search for new massive particles, from which the top quark pairs could have originated.

One theory beyond the Standard Model predicts that top quark pairs could be produced through a massive particle, called a Z' (Z-prime). The existence of such a particle would produce a bump at its mass that physicists might see.

Physicists have previously searched for this signature, but all efforts exploited a signature based on identified leptons and jets, which is considered the easiest area to research in top physics. The all-hadronic channel (no leptons) occurs more often and provides more statistics. It does have the disadvantage of a huge QCD background. The hadronic all-jet final state has a better mass resolution, and it could also serve as an important crosscheck for a possible discovery in the lepton plus jet channel.

Scientists from the University of Florida working at the CDF experiment have recently finished a search in the all-hadronic channel. They applied a reconstruction technique in which the properties of the observed top-antitop events are constrained according to the production and decay matrix predicted from theory. This technique improves the mass resolution, making it easier to separate QCD background events from top-antitop events.

The data revealed no sign of new physics and was found to be in good agreement with the Standard Model prediction. As a result, for one type of model that predicts the Z' particle would exist (leptophobic topcolor), the CDF scientists can exclude masses below 805 GeV/c2.

-- edited by Craig Group

The CDF scientists of the University of Florida group who contributed to this analysis (starting from top left): Yuri Oksuzian, Jaco Konigsberg, Roberto Rossin (now with University of California Santa Barbara), Sasha Sukhanov, Nate Goldschmidt, Jim Lungu (now with Rockefeller University), and Valentin Necula (not shown).

In Brief

Change of recycling subcontractor and dumpsters

The new recycling dumpsters closely resemble the trash dumpsters.

Fermilab has switched recycling subcontractors. Because of this, the laboratory's recycling dumpsters, which were green, have been replaced. The new recycling dumpsters are large and blue and resemble the regular trash dumpsters. To differentiate the two, FESS has marked the new recycling dumpsters "Recycle Only." The new subcontractor will accept co-mingled recycleables, including paper, broken-down cardboard, bottles and cans in these dumpsters.

Shutdown Update

June 19-30
- Linac maintains beam to Neutron Therapy Facility for treatment
- Booster correction element upgrade nearly half completed
- Accumulator kicker upgrade 30 percent done
- Main Injector LCW work ahead of schedule
- Recycler moving six magnets
- Tevatron measured 954 magnet rolls
- NuMI completed initial investigation of Horn 2 LCW leak

Read the Current Accelerator Update
Read the Early Bird Report
View the Tevatron Luminosity Charts


Latest Announcements

On-site housing-fall 2009/spring 2010

Discount for SciTech Summer Camps - July 6

Argentine Tango classes through July 22

Artist Within - pick up artwork July 7 from 8 a.m. to noon

Free Webinar on car buying, July 8

Time to complete accomplishment reports

Arrowhead golf league hole-in-one

Bristol Renaissance Faire discount tickets

Six Flags Great America discount tickets

Pool memberships available in the Recreation Department

Interaction Management and Performance Review courses scheduled for summer 2009

Introduction to LabVIEW - July 8 and Dec. 8

MATLAB software tools 75 percent off for Fermilab - July 15

Intermediate/Advanced Python Programming July 22-24

Outlook 2007: New Features class Aug. 6

Process piping (ASME B31.3) class offered in October

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