Thursday, March 27, 2014

Have a safe day!

Thursday, March 27

9 a.m.-4 p.m.
Joint DES-LSST Workshop - One West, Comitium, WH7XO
Register in person
Registration fee: $42

2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Clifford Cheung, California Institute of Technology
Title: Naturalness and the Weak Gravity Conjecture

3:30 p.m.

Friday, March 28

3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Yuri Gershtein, Rutgers University
Title: Winter 2014 Physics Results from CMS

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Wilson Hall Cafe

Thursday, March 27

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Greek omelet
- Ranch house steak sandwich
- Asian beef and vegetables
- Barbecue pork spareribs
- Rustic club flatbread sandwich
- Tex-Mex grilled-chicken salad
- Chicken noodle soup
- Chef's choice soup
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, March 28

Wednesday, April 2
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Call x3524 to make your reservation.


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Fermilab's new chief operating officer starts this summer

Tim Meyer

This summer, Fermilab will welcome Tim Meyer as its next chief operating officer. Meyer is currently the head of strategic planning and communication at TRIUMF, Canada's national laboratory for particle and nuclear physics. He will succeed Vicky White, who will retire this summer after more than 30 years at Fermilab.

"Tim brings a broad set of experiences in laboratory operations, management and commercialization initiatives that map nicely into our vision for Fermilab," said Fermilab Director Nigel Lockyer. "He has an enviable track record in strategic planning, scientific public policy and affairs, and communications. Tim is credited with developing the strategy for the highly successful TRIUMF funding initiative with the government of Canada, the province of British Columbia and the Canada Foundation for Innovation. I anticipate that he will quickly have a big impact on the laboratory, and we look forward to his arrival."

As COO, Meyer will plan, direct and oversee Fermilab operations. He will help lead day-to-day laboratory management, help define the overall strategic direction for the lab and its performance expectations, and assess resource needs and priorities. Meyer will also develop and maintain strong relationships with DOE staff and other DOE laboratories.

Meyer is very familiar with Fermilab, having been a research assistant here after graduating from the Illinois Mathematics and Science Academy in Aurora. Since then he has visited the lab to give lectures and attend seminars.

"I owe much of my career to early inspiration from this great laboratory, and part of my job now is to return the favor and put my shoulder to the wheel," Meyer said. "I grew up in the Midwest, and moving back with my family to join Fermilab is a great honor."

Prior to TRIUMF, Meyer served as senior program officer at the U.S. National Academies, providing advice to the U.S. government on science and technology. He earned his Ph.D. in experimental particle physics from Stanford University studying the nature and time evolution of the bottom quark.

Meyer will arrive at Fermilab on June 2 and assume the role of COO on July 1.

Deb Sebastian

Editor's note: Fermilab Today will publish a profile of retiring COO Vicky White and her contributions to Fermilab later this year.


Tenth radio-frequency cavity installed in Booster this week

The 10th of 19 cavities was installed in the Booster Wednesday. Photo: Reidar Hahn

On Wednesday, March 26, the Accelerator Division installed the Booster's 10th cavity. This marks the halfway point in the upgrade process. The Booster operates using 19 radio-frequency cavities.

The Accelerator Division, along with members of the Technical Division, are refurbishing the cavities to be able to deliver higher-power proton beams for Fermilab's neutrino experiments.

Photo of the Day

Early morning geometry

The lines of the IARC Office, Technical and Education Building complement those of the Tractricious sculpture. Photo: Tom Nicol, TD
In the News

Have we spotted dark matter in the Milky Way?

From Sky and Telescope, March 25, 2014

Dark matter is arguably one of the universe's most perplexing mysteries. Astronomers have gathered overwhelming evidence that it makes up roughly 84 percent of the universe's matter. Its extra gravity provides the most straightforward explanation for the rotations of individual galaxies, the motions of distant galaxy clusters, and the bending of distant starlight.

So what is this elusive matter? A popular theory is that it consists of a yet-undiscovered exotic massive particle that barely interacts with normal matter. These particles have so far eluded detection. But theoretically they act as their own antiparticles, and can annihilate to produce a cascade of familiar particles, including electrons and positrons. The collision should generate gamma-rays — the most energetic photons in nature.

Read more

Frontier Science Result: CDF

The top, the bottom and everything in between

This diagram shows the s-channel single-top quark production mechanism sought in this analysis, which selects signal events in which the lepton is not identified.

In collisions of high-energy beams, new, heavy particles are usually produced in pairs: a matching antiparticle for every particle. That's the case for the bottom quark and the top quark, both discovered at Fermilab. But every now and then, the weak force is responsible for the collision, and so particles can be transmuted from one kind into another. The weak interaction can also produce a pair of dissimilar particles, a bit like giving birth to fraternal twins rather than identical ones. Studying the rate of such production tells us volumes about the secrets of the weak force and possible new interactions that may mimic it, especially if they favor heavy particles such as the top quark.

This article describes a search for such a process: A top quark and an associated anti-bottom quark are produced via s-channel W boson exchange (see top figure). It is similar to an earlier reported study on evidence for the s-channel process used in a search in what is known as the lepton-plus-jets mode.

The search described in this column is performed in the so-called missing-energy-plus-jets mode. The production mechanism is the same as the earlier CDF search — the top quark decays to a W boson and a bottom quark, and the W boson subsequently decays to a lepton and a neutrino. The two bottom quarks, circled in green in the above figure, produce jets that have long-lived, heavy B hadrons in them. If the lepton is not identified, we use it in the missing-energy-plus-jets analysis; otherwise the earlier analysis makes use of it.

One challenge of analyzing data with jets and missing energy is that they can be mimicked by events with only jets in them. These jets-only events can be mismeasured, resulting in large amounts of fake missing energy. Some of these mismeasured events then contaminate the sample of events used to search for the single-top signal. Scientists use sophisticated algorithms to reduce the amount of contamination from these events, and then use the rejected data to estimate the amount that remains. Other algorithms reduce the contamination from other sources.

The measured cross section in this analysis is 1.12 +0.61/-0.57 picobarns. When combined with the earlier lepton-plus-jets result, the cross section is 1.36 +0.37/-0.32 picobarns. The addition of the missing-energy analysis increases the sensitivity of the combination by more than 10 percent compared with the lepton-plus-jets result alone. This analysis forms the CDF contribution to the Tevatron combined observation of the s-channel single top quark process.

Learn more

Matteo Cremonesi, Tom Junk and Andy Beretvas

These CDF physicists contributed to this data analysis. Top row from left: Giorgio Belletttini (U. Pisa and INFN), Daniela Bortoletto (Purdue), Matteo Cremonesi (INFN Pisa, now at Oxford). Second row from left: Craig Group (U. Virginia and Fermilab), Tom Junk (Fermilab), Kyle Knoepfel (Fermilab). Third row from left: Hao Liu (U. Virginia), Qiuguang Liu (Purdue), Fabrizio Margaroli (Sapienza University of Rome and INFN). Bottom row from left: Yuri Oksuzian (U. Virginia), Karolos Potamianos (Lawrence Berkley National Laboratory), Marco Trovato (Northwestern).

Today's New Announcements

International folk dancing meets Thursday evenings at Kuhn Village Barn

Scottish country dancing meets Tuesday evenings at Kuhn Village Barn

Weight Management registration deadline - today

Fermilab App Development Day for high school students - March 29

School's Day Out - March 30-April 4

Martial Arts - begins March 31

2014 FRA Scholarship applications due April 1

C2ST: The Real Science Behind Star Trek - April 2

LabVIEW seminars scheduled on April 10

MySQL relational database management course - April 22-23

Supervisors needed for SIST interns

West bike rack area closed

Portions of west atrium stair closed for construction

On sale now: Fermilab Natural Areas hats and shirts

Active For Life Multi-Life Challenge

Two yoga classes offered

Walk 2 Run

Indoor soccer