Thursday, July 19, 2012

Have a safe day!

Thursday, July 19
2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Jamison Galloway, University of Rome, La Sapienza
Title: Getting to Know the Higgs

3 p.m.
LHC Physics Center Topic of the Week Seminar - Sunrise, WH11NE
Speaker: Daniel Elvira, Fermilab
Title: SUSY Searches III: Recent CMS Results and Future Directions

3:30 p.m.

4 p.m.
Accelerator Physics and Technology Seminar - One West
Speakers: Manjiri Pande, BARC
Title: Development of 325 MHz Solid-State RF Power Amplifiers for Project X, Under Addendum-V of IIFC

Friday, July 20
3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speakers: Marc Schumann, University of Zurich
Title: Recent Results from the XENON100 Dark Matter Experiment (in association with the Patras Workshop on Axions, WIMPs, and WISPs)

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Wilson Hall Cafe

Thursday, July 19

- Breakfast: Apple sticks
- Minnesota wild rice w/ chicken
- Tuna melt on nine-grain bread
- Smart cuisine: Italian meatloaf
- Chicken casserole
- Buffalo crispy chicken wrap
- Assorted sliced pizza
- Smart cuisine: Mandarin chicken salad

Wilson Hall Cafe Menu

Chez Leon

Friday, July 20

Wednesday, July 25
- Ham & gruyere crepes
- Mixed greens w/ herb vinaigrette
- Fruit pie

Chez Leon Menu
Call x3524 to make your reservation.


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From symmetry breaking

Decision time: Vote for your favorite Higgs

On July 4, CERN scientists announced the observation of a Higgs-like particle, and we asked you to send us photographic evidence of your own encounters with particles of the Higgs kind.

Now it's time to take your citizen science to the next level: Help us choose the best of the best.

Vote for your three favorites from a selection of the many impressive entries we received.

Voting will close at noon CDT on Wednesday, July 25. Your top choices will appear in a gallery in the August issue of symmetry.

—Kathryn Jepsen


“Rugged Elegance” art exhibit merges the earthy with the industrial

Mike Baur's sculpture Reflection Gage is currently on display in Fermilab Art Gallery.

On the Wilson Hall second floor crossover, the Fermilab Art Gallery has a feeling of erupting from the ground and revealing the past. Steel tubes and bars, covered in a rusty red patina, entangle within concrete and PVC. Between them are paintings of parabolic shapes in similar earthy hues on paper and burnt wood. Some paintings use the scraps of an old record book from the 1930s. Others hide a more modern backing of polypropylene.

These pieces of art form an exhibition called "Rugged Elegance," featuring West Chicago artists Mike Baur and Stephen Mueller. The two are friends and mutual admirers and had been looking for an opportunity to do a show together. When Fermilab invited Baur and an artist of his choice, he immediately chose Mueller.

“Fermilab’s always been on my radar,” Mueller said. “The gallery is beautiful and when the opportunity came up, I was interested in showing there because it was a neat venue.”

Mueller’s paintings are influenced by a visit to Australia in 2007, when he encountered Aboriginal art made from natural pigments. He began to look at different ochres, iron oxide powders with various impurities that produce a range of earth tones.

“You can get those pigments in oils and acrylics, but when you do that, the material has lost its magic for me,” Mueller said. “To get your hands on just the raw pigment is pretty spectacular.”

Each of Mueller’s paintings is raw and unvarnished, with few evident touch-up marks.

Baur’s sculpture work is similarly unpolished. Using industrial materials like steel and concrete, he creates conglomerations that suggest fragility but can withstand the rigors of the outdoors.

“I try to make things so they’ll outlast me and my grandkids without falling apart,” he said.

Baur has been working in sculpture for 44 years, and he said each sculpture’s inspiration is one of his previous works. Fermilab Visual Arts Coordinator Georgia Schwender chose the exhibition name “Rugged Elegance” from an essay by the director of the Nathan Manilow Sculpture Park at Governors State University, where two of Baur’s sculptures are part of the permanent collection.

“The name is not as much a theme as it is a description,” Baur said.

The exhibit will be up until September 17. An artist reception will take place tomorrow, July 20, from 5 to 7 p.m. in the Art Gallery.

Joseph Piergrossi

Special Announcement

Controls, power, and cooling outages – July 20-23

Accelerator Division Controls System

On Friday, July 20, beginning at 7 a.m., electrical contractors will connect a new uninterruptable power supply (UPS) to the Accelerator Division controls system as a backup in case of power loss. Power will be off in the Accelerator Division computer room. This outage will last for three days and power will not be brought back online until Monday, July 23, at 7 a.m. There will be no controls or any system or device monitoring available during this outage.

Please turn off computers and small electrical devices in your Wilson Hall offices before you leave work Friday afternoon, July 20, as temperatures may increase over the weekend.

Accelerator Division General Computer System

The Controls Group will attempt to provide general computer access and network services during this power outage, but this service is contingent on maintaining sufficient cooling in the in the AD computer room. If the cooling is insufficient, these servers will be shut down for the duration of the power outage.

Central Utility Building, cooling, and Wilson Hall

On Saturday, July 21, beginning at 7 a.m., the Central Utility Building (CUB) power system will be down for power and utility maintenance until Sunday, July 22, at 5 p.m. Wilson Hall will have NO COOLING during this time except in a few areas.

CUB, which provides comfort and process cooling for many systems, will not provide cooling for the following areas:

  • Wilson Hall
  • Accelerators
  • Cross Gallery
  • Linac
  • Booster Gallery & Towers
  • Transfer Gallery

If you work in any of these areas over the weekend, you will be uncomfortable – plan accordingly.

Spot coolers will provide cooling for the following areas in the Accelerator Division:

  • Accelerator Division Computer Room
  • MAC Room
  • The Main Control Room

Wilson Hall (WH) has a 90-ton chiller that will provide cooling to the following areas:

  • WH Floor 5, northwest
  • WH 8E, Fiber Central Room 874
  • Telecommunications Equipment Room, WH Quarter Southwest Corner
  • Communication Center/Dispatch WH GNX

The CMS Control Room (the LHC remote operations center on the first floor of WH) has its own cooling system.

Result of the Week

Puzzling new pieces in
the antimatter mystery

New measurements from DZero add pieces to the puzzle of matter-antimatter asymmetry.

One of the most puzzling properties of matter in our universe is that there’s so much of it in the first place. When new matter is created during a particle collision, an equal amount of antimatter accompanies it nearly every time. The Standard Model allows only a very slight deviation from this symmetry, and not nearly enough difference between matter and antimatter to explain the abundance of matter in our universe today.

The DZero Collaboration has previously shown evidence for a greater matter-antimatter asymmetry than predicted by the Standard Model in the decays of neutral B mesons, particles that combine a bottom quark with either a down quark (Bd0) or strange quark (Bs0). Two new measurements, which focus separately on the Bd0 and Bs0, now add complementary pieces to this puzzling matter.

Both analyses measured the difference in the number of times a neutral B meson decay included a muon versus an antimuon. If there were no preference for matter over antimatter, then the difference would be zero. Precisely measuring this asymmetry requires accounting for any differences between the ability to find and measure the muon and antimuon versions of B decays.

Muons and antimuons have opposite electric charges, so they will bend in opposite directions when moving in a magnetic field and take different paths through the DZero detector, which can affect their chances of being detected. Because reversing the magnetic field swaps these particle paths, periodically reversing the fields over the course of Run II allowed the analyzers to mitigate this effect on the asymmetry measurement. Complementing this with careful studies of detector performance enabled analyzers to significantly improve upon the previous world’s best measurements for the Bd0 and Bs0 asymmetries.

The new measurements are consistent with the previous evidence for matter-antimatter asymmetry reported by the DZero collaboration, which measured a particular mixture of the Bd0 and Bs0 system asymmetries in an independent channel. In combination, these results differ from the Standard Model by about 3 standard deviations. These new pieces hint at a very interesting picture of the universe, but more precise measurements will be required to finally solve this puzzle.

—Mike Cooke

These physicists made major contributions to this analysis.

The muon identification group’s efforts are critical to all analyses that look for muons, like those described above. They determine the criteria used to find muons with the DZero detector and ensure that muons are well modeled in event simulations.

In the News

Theorists feast on Higgs data

From Nature, July 18, 2012

The popping of champagne corks may have subsided since scientists presented convincing evidence for the existence of the long-sought Higgs boson on July 4, but the work has just begun for theoretical particle physicists, who are revelling in the biggest glut of data they've had since the 1990s. Many are working evenings and weekends to interpret the results, and they have already generated a publication boom, with dozens of papers about the discovery appearing on the preprint server during the past two weeks.

Some are using the fresh data from the Large Hadron Collider (LHC) at CERN, Europe's particle-physics laboratory near Geneva in Switzerland, to eliminate theoretical models. Others are probing for hints of new particles. Most are still hoping that their investigations will produce a grand theory to replace the almost infallible standard model of particle physics, a framework that predicts the behaviour and properties of all fundamental particles and every force except gravity. Despite its success, the standard model contains some mathematical chinks hinting that there must be a deeper truth about how the Universe works — and theorists the world over dream of finding it first.

Read more


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Artist reception - July 20

Collider New Play Project - July 21

Collecting school supplies - through July 27

Volunteers invited to Fermilab prairie quadrat study - July 28

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