Thursday, May 23, 2013

Have a safe day!

Thursday, May 23

LBNE informational meeting - One West

2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Natalia Toro, Perimeter Institute
Title: (Why) Is Helicity Lorentz-Invariant?

3:30 p.m.

4 p.m.
Special Seminar - Curia II
Speaker: Mikhail Dorf, Lawrence Livermore National Laboratory
Title: Modeling of Intense Ion Beam Transport and Focusing for High Energy Density Physics Applications

Friday, May 24

1:30 p.m.
LHC Physics Center Topic of the Week Seminar - WH11NE
Speaker: Natalia Toro, Perimeter Institute
Title: Closing the Door on Weak-Scale SUSY

3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Ben Brau, University of Massachusetts, Amherst
Title: Dark Matter Inspired Exotics Searches with ATLAS

Click here for NALCAL,
a weekly calendar with links to additional information.

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Wilson Hall Cafe

Thursday, May 23

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Greek omelet
- Chicken fajita club sandwich
- Asian beef and vegetables
- Chicken cacciatore
- Italian loaf sandwich
- Tex-Mex grilled-chicken salad
- Chef's choice soup
- Chicken noodle soup

Wilson Hall Cafe menu

Chez Leon

Friday, May 24
- Beef en croute with coriander walnut filling
- Fennel and potato gratin
- Haricots verts with red peppers and almonds
- Coffee creme brulee

Wednesday, May 29
- Fig- and chili-glazed pork tenderloin
- Whipped potatoes
- Steamed green beans
- Banana walnut upside-down cake

Chez Leon menu
Call x3524 to make your reservation.


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Jim Hanlon retires after 28 years at Fermilab

Jim Hanlon

When physicist Jim Hanlon joined Fermilab in 1985, he immediately put both his scientific expertise and leadership skills to work, heading the lab's Film Analysis Facility.

Now, after 28 years at the laboratory, Hanlon is retiring. His last day is May 29.

As group leader of the Film Analysis Facility in what was then called the Physics Department, Hanlon led the analysis of the streamer chamber film from Fermilab's E665 experiment. After completing that assignment, he took over as leader of the newly formed Physics Department Data Support Group in 1990. Then, in 1992, Hanlon began working in the Technical Support Section under Paul Mantsch on the SDC calorimeter project for the Superconducting Supercollider in Texas.

When the SSC project came to an end, Hanlon worked with Fermilab scientist Dan Green to help with the organization of a new collaboration, one that would represent the United States' contribution to the CMS experiment at a new particle collider being built in Geneva, Switzerland—the Large Hadron Collider. Hanlon has worked on CMS ever since, serving first as U.S. CMS project administrator and then in his current position as U.S. CMS resource manager. Hanlon also served as CMS hadron calorimeter resource manager for many years.

The CMS effort continues, but it will have to continue without Hanlon, for whom "travel looms large," he said. After retiring, Hanlon will see the world, visiting China, Tibet and the Amazon rainforest. He will also spend time visiting family in Minnesota in the summers, "feeding the mosquitoes." And, of course, he'll take in some of what Chicago has to offer as well.

"I'm looking forward to day games at Wrigley Field cheering on the Cubs," he said.

A farewell gathering for Hanlon will be held on Wednesday, May 29, at 1 p.m. on the Wilson Hall 11th-floor crossover. If you'd like to attend, please RSVP to Terry Read at x6408 or Carrie Farver at x8529 by Friday, May 24.

Video of the Day

What is supersymmetry?

Don Lincoln describes supersymmetry. A theory is supersymmetric if it treats forces and matter on an equal footing. While supersymmetry is an unproven idea, it is popular with particle physics researchers as a possible next step in particle physics. View the video. Video: Fermilab
In the News

Antarctic neutrino observatory detects unexplained high-energy particles

From Scientific American, May 18, 2013

Hot on the heels of detecting the two highest-energy neutrinos ever observed, scientists working with a mammoth particle detector buried in ice near the South Pole unveiled preliminary data showing that they also registered the signal of 26 additional high-energy neutrinos. The newfound neutrinos are somewhat less energetic than the two record-setters but nonetheless appear to carry more energy than would be expected if created by cosmic rays hitting the atmosphere—a prodigious source of neutrinos raining down on Earth. The particles thus may point to unknown energetic astrophysical processes deeper in the cosmos.

"The result right now is very preliminary," cautions Nathan Whitehorn of the University of Wisconsin–Madison, who described the new data May 15 during a symposium in Madison on particle astrophysics. "We're not totally certain right now that it's from an astrophysical source." But it is difficult to explain the number and energy of the detected particles by invoking known processes within the solar system. "If this does in fact hold up with more data, and this does turn out to be an astrophysical source, then we'll be able to address some questions in ways that were totally inaccessible before," Whitehorn adds.

Read more

In the News

A million minutes to rebuild the Large Hadron Collider

From New Scientist, May 21, 2013

It would be easy to hate this place. It is decrepit and grey, and feels overwhelmingly like a neglected university campus.The fact that the March sky is the colour of damp concrete and releasing sleet that barely falls does not help. During my long tramp across the sprawling CERN particle physics lab near Geneva, it seems to slap into my face like a cold, wet mop. Then there's the irksome way CERN's buildings are numbered. There is no discernible system. Once they'd found building 217, finding the Higgs boson must have been a walk in the park.

could get excited by the fact that somewhere beneath my feet is the Large Hadron Collider – except that there are no particle beams whizzing around its gigantic tunnel. No data is being gathered in preparation for an announcement that will thrill the world. CERN has no magic today: it's just grim. Until, that is, I meet its people.

Read more

Frontier Science Result: CDF

What is the electric charge of the top quark?

Shown is the product of the charge of the W boson and the associated b quark jet. An excess of data in the exotic-model-like right-hand side would indicate that the top quark is not what we think it is.

Since the discovery of the top quark, several of its properties have been measured to confirm the Standard Model predictions. As the top quark decays, one can study its decay products, which are a W boson and a b quark. Determining that the top quark decays into a W+ boson, whose charge is +1, and a b quark, whose charge is -1/3, would ensure indirectly that the electric charge of the top quark is indeed +2/3, as expected in the Standard Model. However, if events were found to contain decays into a W- and b quark final state, the charge of the decaying particle would be -4/3. That would be incompatible with the Standard Model top quark. Such an exotic-decay combination has already been constrained experimentally; however, this new measurement provides a more sensitive result.

CDF physicists have analyzed top-antitop events in the final state that has jets from the decay of a W boson and an electron or muon from the decay of a second W boson. They also look at the decay's two b-jets, associating each with its W boson by examining the event's kinematics.

To reconstruct the electric charge, scientists determine the charge of the W bosons using the electron or muon charge and the charge of the b-jets using a jet-charge procedure. This procedure determines the b-jet charge by weighing the charges of the tracks inside the jet. These tracks are predominantly negative if the b-jet is initiated by a b quark and predominantly positive if the b-jet is initiated by an anti-b quark. The probability that the sign of b or b-bar quark charge will be determined correctly is about 60 percent.

Using a data set of 5.6 inverse femtobarns, CDF physicists classified 774 W + b-jet pairs. Of these, 416 pairs are Standard Model-like (left side of the above figure) and 358 pairs are exotic-model-like (right side of the above figure). This means we can exclude the exotic-quark hypothesis with the -4/3 electric charge at the 99 percent confidence limit.

Learn more

edited by Andy Beretvas

These CDF physicists contributed to this data analysis.
Photo of the Day

Formidable potential

Jesus Orduna, Rice University, took this photo from the bird watching area by Lake Law in the Village just before the heavy rain hit Monday night.

Today's New Announcements

10,000 Steps participation winner

Fermilab Family Outdoor Fair - June 9

DASTOW scheduled - June 21

Fermilab prairie quadrat study

46th Fermilab Users Meeting registration now open

Register for Argonne-UChicago-Fermilab collaboration meeting

Bologna workshop in honor of Franco Rimondi

Summer Zumba

Swim lessons for children

Water fitness at Fermi Pool

Martial arts class

10,000 Steps-A-Day enrollment

Open gym basketball Tuesday evenings

Outdoor soccer at the Village

English country dancing at Kuhn Barn