Thursday, March 12, 2015

Have a safe day!

Thursday, March 12

1:30 p.m.
Neutrino Seminar - WH8XO
Speaker: Joseph Formaggio, MIT
Title: Neutrino Mass Measurements

2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Peisi Huang, Argonne
Title: Higgs Trilinear Coupling as a Probe of Electroweak Phase Transition

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

Friday, March 13

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


8 p.m.
Fermilab Lecture Series - Auditorium
Speaker: Mina Bissell, Berkeley National Laboratory
Title: New Understandings of Cancer
Tickets: $7

Visit the new labwide calendar to view additional events at Fermilab

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Wilson Hall Cafe

Thursday, March 12

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Mexican omelet
- Steak soft tacos
- Roasted pork loin with orange mustard glaze
- Chicken vindaloo
- Roast beef and cheddar wrap
- Mandarin orange pecan chicken salad
- Split pea soup
- Chef's choice soup
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, March 13

Wednesday, March 18
- Seafood cioppino
- Salad with herb vinaigrette
- Lemon blueberry cake

Chez Leon menu
Call x3524 to make your reservation.


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From Dark Energy Detectives

The best of the best

One of the ways members of the Dark Energy Survey will learn about dark energy is by measuring the shapes of 200 million galaxies very precisely and comparing them to each other. DES strives to get the best, clearest snapshots of these 200 million galaxies that they can. Image: Francisco Valdez, NOAO, and Dark Energy Survey collaboration

The clearest skies give the best images and provide the best clues to cosmic expansion.

Scroll down through the Dark Energy Detectives case files, and you'll see beautiful images of galaxies taken with the Dark Energy Camera. While they come in different shapes, sizes and colors, these galaxies all have one thing in common: They're all speeding away from our own Milky Way at speeds of tens to hundreds of millions of miles per hour. The universe is expanding, something we've known for nearly 90 years.

If we could track the speeds of each of these galaxies over time, what would we find: Would they stay the same, speed up or slow down? Since the Milky Way's gravity tugs on them, Isaac Newton would have told us they would slow down over time, just as an apple thrown straight up in the air slows down (and eventually falls) due to the pull of Earth's gravity. But Isaac would have been wrong. The galaxies are getting faster, not slower. The expansion of the universe is speeding up, something we've known for only 17 years. The 300 detectives of the Dark Energy Survey are embarking on a five-year mission to understand why this is happening. In this quest, they're carrying out the largest survey of the cosmos ever undertaken.

Read more

Josh Frieman, Fermilab and University of Chicago

In Brief

Theater run of Creation's Birthday begins March 26 at Athenaeum Theatre in Chicago

Creation's Birthday takes center stage this month at the Athenaeum Theatre.

Technical Division Head Hasan Padamsee's play Creation's Birthday will be performed at the Athenaeum Theatre in Chicago from March 26-April 19.

Presented by Genesis Theatrical Productions, the play brings to life the story of the genesis of the big bang theory through the legendary battle between astronomer Edwin Hubble and science icon Albert Einstein.

Fermilab employees receive a discount by entering the word "Fermi" as the promotional code when purchasing tickets online.

Read more about the play in Fermilab Today.

Photos of the Day

High rise from the driver seat

It's rare to get a view of Wilson Hall from the vantage of the pond in front of it. The pond was frozen over on a recent morning, so Dan Bollinger was able to ride his bike on it and snap this photo. Photo: Dan Bollinger, AD
A look into the side view mirror offers a different perspective on the high rise. Photo: Stephanie Timpone, PPD
In the News

Dark Energy Survey reveals signs of nine dwarf galaxies

From NBC News, March 10, 2015

Two groups of astronomers looking around the edges of our Milky Way galaxy were surprised to find a gaggle of previously undetected dwarf satellite galaxies — incredibly dim conglomerations of stars that may account for some of the mysterious dark matter in our cosmic neighborhood.

Nine galaxy candidates were discovered in a region of the southern celestial hemisphere near the best-known dwarf galaxies orbiting the Milky Way: the Large and the Small Magellanic Cloud. The closest is about 95,000 light-years away. The farthest is more than a million light-years distant.

A team of astronomers from the University of Cambridge and a separate group representing the Dark Energy Survey, headquartered at Fermilab, announced the discoveries jointly on Tuesday.

Read more

In the News

Tohoku pins rebound hopes to atom smasher

From The Japan Times, March 9, 2015

As the disaster-hit Tohoku region struggles to recover from the deadly tsunami four years ago, many residents have hopes for what is considered a once-in-a-lifetime opportunity to galvanize the area's resurrection.

Chances are the region may host the International Linear Collider, a state-of-the-art research facility physicists worldwide hope will shed light on the secrets of the universe.

Read more

Frontier Science Result:
CDF and DZero

Joining forces to test the Higgs boson's spin and parity

This plot shows the observed and expected upper limits at the 95 percent credibility level on the fraction of exotic boson production for two cases (spin zero with negative parity and spin two with positive parity). A signal scale of one corresponds to the Standard Model.

The Higgs boson caused a lot of excitement when the ATLAS and CMS collaborations announced its discovery in 2012. Everyone was bursting with questions: How much does it weigh? How is it made? How does it decay? Does it have any spin, and if so, how much? Does it look the same in a mirror or not (the question of "parity")?

The Standard Model predicts the answers to all of these questions, although some depend on the Higgs boson mass, which ATLAS and CMS have measured precisely. So far, the new particle observed at the LHC is consistent with all of the Standard Model's predictions. In particular, ATLAS and CMS's measurements of the spin and parity allowed them to confidently identify the new particle as a Higgs boson.

The Tevatron experiments, CDF and DZero, also found evidence for a Higgs boson in 2012, looking at events in which two bottom-flavored jets recoiled from a vector boson — either a Z or a W. All the same questions come up, as some models predict that one may observe a mixture of Higgs particles at the Tevatron different from what was observed at the LHC due to the different mixtures of production and decay modes that provide the most sensitivity.

At the Tevatron, the Higgs boson's properties were found to be consistent with those predicted for the Standard Model Higgs boson. Theorists provided a clever way to test some models of the Higgs boson's spin and parity using Tevatron data: Higgs bosons with exotic spin and parity would be produced with more energy than the Standard Model version. CDF and DZero looked at the energies and angles of particles produced in Higgs boson events to check. But most events at the Tevatron are non-Higgs-boson background events, so a lot of hard work went in to test the models.

Both DZero and CDF modified their Higgs boson analyses to search for the new particles, if they are present in addition to the Standard Model Higgs boson, or if they replace it entirely. Neither experiment found evidence for the exotic states, and the data prefer the Standard Model interpretation.

But a much stronger statement can be made when CDF and DZero join forces and combine their results, using the same techniques used in the Standard Model Higgs search combinations. The signal strength of exotic Higgs bosons in the JP=0- and 2+ states is no more than 0.36 times that predicted for the Standard Model Higgs boson. Given a choice between the Standard Model Higgs boson, which has JP=0+, and one of the two exotic models replacing it with the same signal strength, the Tevatron data disfavors the exotic models with a significance of 5.0 standard deviations for 0- and 4.9 standard deviations for 2+.

The figure above shows limits on the fraction of exotic Higgs boson production as functions of the total signal rate, assuming that the Higgs signal is a mixture of the Standard Model Higgs boson and one of the exotic kinds. The particle for which the Tevatron experiments reported evidence in 2012 is consistent with having the spin and parity predicted by the Standard Model.

Tom Junk

Learn more

Tom Junk (Fermilab) of the CDF experiment made significant contributions to this result.
Gavin Davies (Imperial College London) and Wade Fisher (Michigan State University), both at DZero, made significant contributions to this result.

Today's New Announcements

Fermilab Today to update format - March 16

Monday Golf League

Philosophy Society, A. Burov: Value of Fundamental Science - today

Zumba Fitness registration due today

Lab-Corps program accepting applications until March 13

Barn Dance party - March 15

Zumba Toning registration due March 17

10-minute employee appreciation chair massages - March 17

URA Thesis Award competition deadline - March 20

URA Visiting Scholars Program deadline delayed to March 30

2015 URA Alvin Tollestrup Award application deadline - April 1

SharePoint online training videos available for on-site users

Help Abri Credit Union celebrate our members and Pi Day

Fermilab Golf League 2015 season is just around the corner

International folk dancing Thursday evenings at Kuhn Barn

Indoor soccer

Changarro restaurant offers Fermilab employee discount