Friday, Dec. 5, 2014

Have a safe day!

Friday, Dec. 5

3:30 p.m.
Director's Coffee Break - WH2XO

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Martijn Mulders, CERN
Title: Recent Results on Top Quark Physics from CMS

Saturday, Dec. 6

8 p.m.
Fermilab Arts Series - Ramsey Auditorium
Reduced Shakespeare's Ultimate Christmas Show
Tickets: $30/$15

Monday, Dec. 8

2 p.m.
Particle Astrophysics Seminar - WH8XO
Speaker: Marius Millea, University of California, Davis
Title: Planck 2014 Cosmology Results

3:30 p.m.
Director's Coffee Break - WH2XO

4 p.m.
All Experimenters' Meeting - Curia II

Visit the labwide calendar to view Fermilab events

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Flags at full staff

Wilson Hall Cafe

Friday, Dec. 5

- Breakfast: big country breakfast
- Breakfast: chorizo and egg burrito
- Backyard pulled pork burger
- Asian braised beef and vegetables
- Southern fried chicken
- Turkey and cucumber salad wraps
- Big beef or chicken burrito
- Cioppino
- Texas-style chili
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, Dec. 5
- Spinach and strawberry salad
- Lobster tail with champagne butter sauce
- Spaghetti squash with scallions
- Grilled asparagus
- Cold lemon souffle

Wednesday, Dec. 10
- Salmon Wellington
- Parmesan orzo
- Lemon Napoleon

Chez Leon menu
Call x3524 to make your reservation.


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Three Fermilab users elected 2014 AAAS fellows

The American Association for the Advancement of Science has elected three Fermilab users AAAS fellows.

Priscilla Cushman, Marvin Marshak and Harrison Prosper are three of 401 AAAS members nominated this year as fellows by their peers in recognition of distinguished contributions to their fields of study.

Priscilla Cushman

For leadership roles in the search for dark matter, the precision measurement of the anomalous muon magnetic moment and the understanding of ultra-low backgrounds

Marvin Marshak

For leadership and distinguished contributions to underground physics, the measurement of rare phenomena such as proton decay and neutrino oscillations in underground laboratories

Harrison Prosper

For pioneering leadership in the development of advanced statistical methods leading to the discovery of the top quark and precision measurements in top quark physics


Reduced Shakespeare Company's Ultimate Christmas Show - Saturday

See the "Ultimate Christmas Show" by the Reduced Shakespeare Company on Saturday, Dec. 6, at 8 p.m. in Ramsey Auditorium.

The Fermilab Arts Series is dedicated to bringing audiences holiday cheer that is a bit out of the ordinary, and this year is no exception. The Reduced Shakespeare Company puts their own zany spin on the season this Saturday, Dec. 6, at 8 p.m. in Ramsey Auditorium.

The company's "Ultimate Christmas Show" features an Annual Holiday Variety Show and Christmas Pageant at St. Everybody's Non-Denominational Universalist Church, where all faiths are welcome because they'll believe anything. But there's a problem — none of the acts scheduled to perform have arrived, so the three members of the Reduced Shakespeare Company are pressed into service to perform the entire show by themselves.

The Reduced Shakespeare Company will take you on an irreverent yet heartwarming trip through the holidays in "The Ultimate Christmas Show." It's festive, funny, physical family fun as these Three Wise Guys celebrate favorite winter holiday traditions.

You can bring a wrapped Christmas gift of $5 value or less and participate in the audience gift exchange.

Tickets are $30 or $15 for those age 18 and under. For more information or reservations, visit the Arts Series Web page or call 630-840-2787 on weekdays between 9 a.m. and 4 p.m.

In the News

Franklin Orr confirmed as undersecretary for science and energy

From DOE, Dec. 4, 2014

WASHINGTON — Dr. Franklin (Lynn) Orr was confirmed by the Senate on December 4, 2014 as the Under Secretary for Science and Energy at the Department of Energy.

"Lynn Orr is an outstanding scientist and has successfully led a major multidisciplinary program on energy sources, technology and analysis at one of the top research universities. This experience will serve him well as the DOE Undersecretary for Science and Energy," said Energy Secretary Ernest Moniz. "I look forward to working closely with Lynn to shape the nation's clean energy agenda, and to sustain American leadership in science. I thank the Senate for approving his nomination."

Read more

In the News

Working Lego particle accelerator finds the Minifigs boson

From CNET, Nov. 25, 2014

If you've ever wanted a particle accelerator of your very own, there are several options available. You could build yourself a Van de Graaff generator — or you could build yourself a model version out of Lego — like the one built by Jason Alleman of JK Brickworks.

It doesn't actually accelerate particles any faster than any normal thing in the normal world accelerates particles — in short, it ain't no Large Hadron Collider, or even a Small Hadron Collider -- but it's still a really danged cool Lego model.

"This working particle accelerator uses a simple system of spinning wheels to accelerate a Lego ball around a ring. Although the propulsion system is different than that of a real particle accelerator, it's a great way to illustrate the concept," Alleson explained. "Not to mention, it is fun to play with. Multiple balls can be inserted simultaneously and obstacles can be introduced for the ball(s) to collide with."

Read more

Frontier Science Result: CMS

Precisely measuring nothing

Collisions like these indicate the existence of invisible particles. The blob of color in the upper left hand corner shows where particles were knocked out of the collision to deposit energy in the detector. The fact that we see no balancing energy in the lower right hand corner means that an invisible particle has escaped the detector. As the number of simultaneous collisions in the LHC increases, it will become increasingly difficult to study this kind of physics.

The CMS detector is a technical tour de force. It can simultaneously measure the passage of electrons, pions, muons, photons and all manner of particles, both short-lived and long-lived.

However, there are some particles that simply don't interact very much with matter. These include neutrinos and some hypothetical long-lived and weakly interacting particles that may appear in collisions that probe supersymmetry, extra dimensions of space and dark matter. The CMS detector simply doesn't see those kinds of particles.

That sounds like a terrible oversight, but the reality is more comforting. We can use physical principles of the kind taught in high school physics classes to identify collisions in which these particles are made. Essentially, we see them by not seeing them.

In the first semester of physics, we learn about a quantity called momentum and how it is conserved, which means it doesn't change. In the classical world, momentum is determined by multiplying an object's mass and velocity. In the world of relativity and particles, the definition is a bit different, but the basic idea is the same and the principle that momentum is conserved still applies.

Prior to a collision, particles travel exclusively along the beam direction. This means that before the beam particles collide, there is no momentum perpendicular to the beams, or what scientists call transverse momentum. According to the laws of momentum conservation, there should be zero net transverse momentum after the collision as well. If we sum the transverse momentum of all particles coming out of the collision, that's what we find.

However, when there are undetectable particles, the measured transverse momentum is unbalanced. Scientists call the unobserved transverse momentum missing transverse energy, or MET. MET is a clear signature of the existence of one or more invisible particles. Accordingly, it is important to measure carefully the transverse momentum of all observable particles.

Particle experiments have been employing this technique for decades, but few experiments have operated in the challenging collision environment that exists at the LHC. Any time the beams pass through one another, typically dozens of collisions between beam particles occur. Most often, one of those collisions involve some "interesting" process, while the others usually involve much lower-energy collisions. However, those low-energy collisions still spray particles throughout the detector. The existence of these extra particles confuse the measurement of MET and make it tricky to know the exact momentum of the invisible particles.

CMS scientists have worked long and hard to figure out how to mitigate these effects and recently submitted for publication a paper describing their algorithms. With the impending resumption of operations of the LHC in the spring of 2015 (which could involve as many as 200 simultaneous collisions), researchers will continually revise and improve their techniques.

Don Lincoln

These physicists contributed to this paper.
Photo of the Day

Darkest just before dawn

The sun begins to rise over the MC-1 Building Photo: Greg Vogel, AD

Today's New Announcements

Cashier's office closed during holidays

RSVP for Fermilab Family Holiday Party today

Reduced Shakespeare Company's Ultimate Christmas Show (abridged) - Dec. 6

Opera concert at Fermilab by international artists - Dec. 7

English country dancing Sundays at Kuhn Barn - Dec. 7, Jan. 4

Budker Seminar - Dec. 8

New time for Pace Call-n-Ride departure from Fermilab starts Dec. 8

NALWO winter coffee and tea - Dec. 8

HEPAP meeting available by ReadyTalk - Dec. 8-9

Wilson Hall Super Science Stocking Stuffer Sale - Dec. 10-11

Artist reception - Dec. 12

No on-site prescription safety eyewear - Dec. 24 and 31

Fidelity town hall meetings this week

Scottish country dancing Tuesday evenings at Kuhn Barn

International folk dancing Thursdays evenings at Kuhn Barn

Indoor soccer

Norris Recreation Center discount for employees

Find new classified ads on Fermilab Today.