Thursday, March 13, 2014

Have a safe day!

Thursday, March 13

11 a.m.
Intensity Frontier Seminar Series - WH8XO
Speaker: Thomas Strauss, University of Bern
Title: OPERA Results and Emulsion Detector Applications

11 a.m.
Academic Lecture Series - One West
Speaker: Bradford Benson, Fermilab
Title: The Cosmic Microwave Background: How Do You Measure It?

2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Matthew McCullough, MIT
Title: Search for BSM Higgs Signals at NLO

3:30 p.m.

Friday, March 14

3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Lauren Hsu, Fermilab
Title: Search for Low Mass WIMPs with SuperCDMS

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

Ongoing and upcoming conferences at Fermilab


Take Five

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Current Security Status

Secon Level 3

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Flags at full staff

Wilson Hall Cafe

Thursday, March 13

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Mexican omelet
- Steak soft tacos
- Braised beef with vegetables
- Chicken parmesan
- Baked ham and Swiss ciabatta
- Sweet and sour chicken
- Beef barley soup
- Chef's choice soup
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, March 14

Wednesday, March 19
- Ham and gruyere crepes
- Cabbage salad
- Caramel macchiato cheesecake

Chez Leon menu
Call x3524 to make your reservation.


Fermilab Today

Director's Corner

Frontier Science Result

Physics in a Nutshell

Tip of the Week

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One minute with Debbie Gomez, Southern Food Management catering

Debbie Gomez takes care of catering Fermilab events and works in the Wilson Hall cafeteria. Photo: Cindy Arnold

How long have you worked at Fermilab?
Ten years next month (April). It's gone by fast.

Describe a typical workday.
I bake desserts, stock the cafeteria and work as a cashier. I'm also the one who prepares many of the catered meals at parties and meetings.

What's the best part of your job?
I like catering. It's something different every day, and I get to interact with so many people. I try to make sure everybody's satisfied.

What's your favorite event that you helped cater?
We cater the tornado seminar every year. We feed about 70 people — [meteorologist] Tom Skilling, the other presenters and the WGN crew — for a sit-down supper. We always talk with Tom. Last year we went backstage and got our photo taken with him. He's a really, really nice guy.

When did you begin doing this type of work?
I started working as a cashier when my oldest kid was in first grade, and later I worked in the cafeteria of a Chicago-area business.

What do you enjoy doing outside of work?
Watching my three grandkids. They're 20 months, 13 years and 17 years old.

What's something people may not know about you?
I've lived in the Chicago area since I was six months old.

Amanda Solliday

If there is an employee or contractor you'd like to see profiled in an upcoming issue of Fermilab Today, please email

In Brief

LHC scientists to chat with audiences at "Particle Fever"

A new documentary on the hunt for the Higgs is almost here! It arrives Friday, March 14, at the AMC Showplace Naperville 16 and the Music Box Theatre in Chicago.

Scientists on LHC experiments will be at select screenings at the Naperville AMC to chat with audience members:

Friday, March 14, 7:40 p.m.
Taylor Childers (Argonne), Jim Hirschauer, Don Lincoln and Verena Martinez Outschoorn (all from Fermilab)

Saturday, March 15, 7:40 p.m.
Kevin Burkett, Oliver Gutsche (both from Fermilab), Tom LeCompte (Argonne) and Rafael Lopes de Sa (Fermilab)

Sunday, March 16, 2 p.m.
Ben Auerbach (Argonne), Rick Cavanaugh, Kurt Riesselmann and Elizabeth Sexton-Kennedy (all from Fermilab)

Advance tickets are now available online at the Music Box Theatre and AMC Showplace websites. (On the AMC website, select a date on or after March 14.)

Photo of the Day

Radiating through galaxies

An astronomer and four students at the University of London Observatory first spotted SN-2014J, a type-1A supernova, in January. Taken on Feb. 23, this image is a composite of 52 30-second exposures. Photo: Marty Murphy, AD
In the News

Looking for the electron's electric dipole moment

From Physics Today, March 2014

Since 1950, experimenters have been trying to measure the electron's electric dipole moment de and getting increasingly stringent upper limits — but no clear signal. In the early days, the quest seemed dubious because a de would break symmetries that were then thought to be inviolate. By the mid 1960s it was clear that those symmetries are in fact broken. But the standard model of particle theory, which incorporates the known symmetry violations, predicts a de of about 10−38 e·cm, far too small to measure. However, attempts to progress beyond the manifestly incomplete standard model predict much higher de magnitudes that should be measurable with molecular-beam techniques. Now the ACME collaboration reports a new null result from a particularly sensitive experiment that uses a thorium oxide beam.

Read more

Frontier Science Result: CDF

An indirect measurement of the W mass using muon pairs

Comparisons of the world's average of direct measurements of the mass of the W boson (TeV and LEP-2, in black), with the recent CDF indirect measurements extracted from the forward-backward asymmetry of Z bosons (in red and blue).

The W boson is one of the particles that mediates electroweak interactions. Scientists have put forth great effort to determine its mass, and a recent column related CDF's documentation of the single most precise direct measurement. This column summarizes an indirect determination of the W mass. This indirect method, using electrons, has been used by both CDF and DZero.

In the Standard Model of particle physics, the masses of the Z and W bosons are related to another parameter of the theory called the electroweak mixing angle sin2θW. This angle is a parameter in the unification of the weak and electromagnetic interactions, known as the electroweak interaction of the Standard Model.

Since the Z boson decays into a muon or electron and its antiparticle, all of which can be tracked in the detector, scientists can determine its mass very precisely.

A precise measurement of the mass of the W boson is harder because the W boson decays into a muon or electron and its partner neutrino, which does not leave a trace in the detector and therefore goes undetected. The mass of the W can be obtained from the mass of Z and sin2θW.

For this CDF measurement, scientists used the full Tevatron Run II sample of 277,000 Z boson decays into muon-antimuon pairs. In this experiment, a quark from the proton interacts with an antiquark from the antiproton, producing a Z particle, which then decays into a pair of oppositely charged leptons (muons or electrons). The process is called Drell-Yan pair production.

Because of the presence of the weak interaction in the Standard Model, on average the negatively charged muon from the decay of the Z boson has a slight preference for being emitted in the direction of the proton over that of the antiproton. A measurement of the asymmetry between the number of Z events with negatively charged muons emitted in the direction of the proton (forward) and events with negatively charged muons emitted in the direction of the antiproton (backward) can be related to the value of sin2θW.

The above figure shows a comparison of the world average of the combined direct measurements of the W mass from CDF, DZero and LEP-2 (labeled TeV and LEP-2). The previous indirect measurement is labeled CDF ee 2 fb-1 (in red). This measurement is labeled CDF μμ 9 fb-1 (in blue). We measure the mass of the W to be 80.365 ± 0.047 GeV/c2, and this is in good agreement with both the direct and earlier indirect measurements. Stay tuned as CDF physicists are now analyzing Z decays into electron-positron pairs in the full Tevatron data set of 9 fb-1.

Learn more

edited by Andy Beretvas

These physicists were responsible for this analysis. From left: Arie Bodek, Jiyeon Han and Willis Sakumoto, all from the University of Rochester

Today's New Announcements

SharePoint My Site maintenance - March 14-17

Have you used all of your 2013 Healthcare Reimbursement Account funds?

Employee Appreciation Day massages - today

"Particle Fever" opens in Naperville and Chicago - March 14

Hawk talk: Raptors of the Fermilab Region - March 15

Fantasticks: Steampunk at Fermilab Arts Series - March 15

Barn Dance - March 16

URA Thesis Award competition deadline - March 20

Walk 2 Run begins March 20

Photography contest - through March 21

Weight Management registration deadline March 27

2014 FRA Scholarship applications due April 1

MySQL relational database management course - April 22-23

West bike rack area closed

Portions of west atrium stair closed for construction

Help Abri Credit Union celebrate our members and Pi Day

International folk dancing meets Thursday evenings at Kuhn Barn

Scottish country dancing meets Tuesday evenings at Kuhn Barn

Indoor soccer