Fermilab Today Wednesday, December 13, 2006

Wed., December 13
3:30 p.m. Director's Coffee Break - 2nd Floor Crossover
4:00 p.m. Fermilab Colloquium - 1 West
Speaker: T. Roberts, Illinois Institute of Technology and Muons, Inc.
Title: Experimental Tests of Special Relativity


Thurs., December 14
12:00 p.m. Special Particle Astrophysics Seminar - The Dark Side (WH-6W) (NOTE DATE, TIME, LOCATION)
Speaker: D. Stojkovic, Case Western Reserve University
Title: Black Hole Formation, Evaporation and the Information Loss Paradox
1:00 p.m. ALCPG ILC Physics and Detector Seminar - Hornets Nest (WH-8XO)
Speaker: R. Raja, Fermilab
Title: The MIPP Experiment Upgrade and Hadronic Shower Simulations
2:30 p.m. Theoretical Physics Seminar - Curia II
Speaker: G. Kozlov, JINR, Dubna
Title: Lepton-Flavor Violation, Extra Gauge Bosons and New Physics Scale
3:30 p.m. Director's Coffee Break - 2nd Floor Crossover
4:00 p.m. Accelerator Physics and Technology Seminar - 1 West
Speaker: P. Adamson, University College, London/Fermilab
Title: Main Injector Digital Dampers
6:00 p.m. UTeV Seminar - 1 West
Speaker: R. Field, University of Florida
Title: Toward an Understanding of Hadron-Hadron Collisions: From Feynman-Field to the Tevatron

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


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Secon Level 3

Wilson Hall Cafe
Wednesday, December 13
-Creamy Mushroom Chicken Soup
-Texas Style Meatloaf Sandwich
-Chicken Wellington
-Italian Sausage with Peppers
-Smoked Turkey Panini Pesto Mayo
-Assorted Slice Pizza
-Chicken Alfredo Fettuccine

Wilson Hall Cafe Menu

Chez Leon

Wednesday, December 13
Roast Pork Loin with Lingonberry Sauce
Braised Red Cabbage
Dilled New Potatoes
Spiced Honey Cake

Thursday, December 14
Coquille St. Jacque
Medallions of Pork Tenderloin with Port Mushroom Sauce
Corn Risotto
Vegetable of the Season
Chocolate Fondue with Assortment of Fruit

Chez Leon Menu
Call x4598 to make your reservation.


Fermilab Today
Result of the Week
Safety Tip of the Week
ILC NewsLine


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Special Result of the Week

Lonely top quarks

Dugan O'Neil from Simon Fraser University presented the results at a seminar Friday, December 8.

At the Wine and Cheese seminar Friday, December 8, the DZero collaboration announced that it has found, for the first time ever, evidence for top quarks produced singly, rather than in pairs. Ten years ago, the top quark was discovered at the Tevatron, but it was not alone. Each top quark observed was accompanied by its anti-matter partner, produced by the strong nuclear force in a relationship that has been carefully studied ever since. However, theorists have long pointed out that a top quark could also be found on its own, a lonesome particle without its mate.

At roughly the same mass as a gold atom, the top quark is a heavyweight in the world of elementary particles. However, searching for single-top production is frustratingly similar to panning for gold: only once in every twenty billion proton-antiproton collisions is a top quark expected to be produced by itself. Making matters worse, the signature of such occurrences is easily mimicked by other "background" processes that occur at much higher rates. To stand a chance of seeing the single-top signal, physicists at the DZero experiment had to develop sophisticated selection procedures. The first stage selected approximately 1,400 candidate events. Of these candidates, only about 60 single-top events were expected, and experimenters exploited every bit of information to unambiguously establish their presence. DZero used three different techniques that combine many discriminating variables in ways that allows physicists to recognize the true single-top events--much like a mother's ability to distinguish identical twins.

With a high degree of agreement among the three measurement techniques, DZero physicists have measured the single-top production cross section at 4.9 +/- 1.4 pb, in good agreement with the theory prediction. They estimate the chance of this value to be the result of a background fluctuation at only one in 2,800. Because of this high degree of certainty, the DZero Collaboration has, for the first time, established evidence for single-top production. This analysis also allows the first direct measurement of |Vtb| at >0.68, consistent with the presence of only three families of quarks.

These lonely top quarks will find themselves in good company as they join a rich history of high-energy physics at Fermilab.

Readers Write

Smoot as band director?

Dear FT:

You may find this aspect of the Nobel Prize ceremony amusing.

Jonathan Lewis,
Particle Physics Division
Readers Write

Don't burn wrapping paper

Dear FT:

Every once in a while you share safety tips.
Here is a link to a timely article that anyone with a fireplace should commit to memory.

Don Rohde,
Accelerator Division
In the News

From The Scotsman, December 11, 2006:

'Ray gun' cancer cure nears speed of light

Medical scientists will soon be able to offer cancer patients a radical new treatment using hugely accelerated ion particles to target tumors precisely without the dangerous side-effects of current procedures.

The carbon-ion therapy accelerates ions to up to 73 percent of the speed of light in a synchrotron--a machine similar to the particle accelerator at the CERN laboratory in Switzerland--before beams are fired into patients' cancerous cells.

Dr Juergen Debus, the chief radiologist at the Heidelberg Ion Beam Therapy Centre (HIT) in Germany, where the treatment will first be available, claimed the process turned the carbon ions into "miniature precision-guided missiles" that can destroy cancer cells with pin-point accuracy.

Read More

From the Technical Division

Another ILC milestone

This column is written by Marc Ross, head of the Technical Division.

Ruben Carcagno, Cosmore Sylvester and Camille Ginsburg (from left) are managing the ILC RF test stand project. The vertical test pit is behind them.

Early summer Fermilab will achieve a major milestone when our new superconducting RF cavity vertical test stand begins operation inside Industrial Complex building IB1. At that time a new niobium cavity, fabricated in Germany by the ACCEL Corporation and freshly electro-polished in Virginia at the Jefferson Lab, will arrive for testing. Soon after, the new system will begin delivering the results that will be one of our primary contributions to the global ILC superconducting RF test and development effort.

Marc Ross

Superconducting cavities are made by forming niobium sheets into bell-shaped half cells and carefully welding these together. In order to obtain the performance we require, the inside of the cavity must be extremely clean, such that it is completely free of contaminants. At present, the best way to test that the surface has been properly cleaned is to check its performance in a vertical test stand. It is during that critical test that the real "personality" of a new cavity is first revealed.

We expect this test system to become a real workhorse, like the older superconducting magnet test stands located nearby. It has two equally important roles, first to check the performance of the cavities, which will then be used for our test facilities, and second to allow Fermilab scientists and engineers to advance this amazing technology and to increase our contribution to the world's effort, applying it to new projects.

Photo of the Day

Rippled sky: AD's Greg Vogel took this picture of last Friday's sunset. He was standing in the parking lot behind the East Booster Tower.


Happy birthday Nikolai!

Nikolai Mokhov

Nikolai Mokhov--an internationally renowned expert in accelerator radiation and beam energy deposition--turns 60 today. His Accelerator Division colleagues congratulate him with jubilee!

If you have a birthday, wedding or other employee milestone to announce, please email us at today@fnal.gov.


Barnstormers annual meeting today
The Barnstormers Model Airplane Club is holding their annual December Meeting at 5:30 p.m. today in the Users Center Music Room. The club will sell tickets and hold a raffle for two model airplanes. Everyone who is interested is welcome to show up. Contact Andreas Jansson (jansson@fnal.gov) or Jim Zagel (zagel@fnal.gov).

New Computer Programming Courses
The first in a series of new computer programming courses will be given on January 16. Presented in a single two-hour session, the first offering is "To Copy or Not to Copy: A Deeper Look at Values in C++." It is aimed at programmers with C++ experience, and will deal in depth with issues related to copying values in C++ programs. Attendees will learn to identify and take advantage of opportunities for improved performance, and will be prepared for related new techniques that will become available in the next C++ standard. There is no cost to attend, and TRAIN credit will be awarded to participants. Course registration is now open. View the course announcement and syllabus.

A message from the Employment Office

Employees must update their charitable deductions with Payroll before the end of the year. If you have questions about how to do this, contact Dianne Engram at x4633.

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