Friday, Nov. 14, 2014

Have a safe day!

Friday, Nov. 14

10 a.m.
Particle Astrophysics Seminar (NOTE DATE, TIME, LOCATION) - WH2NW
Speaker: Yannis Semertzidis, IBS and KAIST
Title: The Axion Search Plan at the Center for Axion and Precision Physics in Korea

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

4 p.m.
Joint Experimental-Theoretical Physics Seminar and Fermilab Colloquium - One West
Speaker: Breese Quinn, University of Mississippi
Title: DZero Precision Measurements of Electroweak Bosons from Birth to Death

Saturday, Nov. 15

8 p.m.
Fermilab Arts Series - Ramsey Auditorium
African Guitar Summit
Tickets: $28/$14

Monday, Nov. 17

2 p.m.
Particle Astrophysics Seminar - Curia II
Speaker: Richard Shaw, Canadian Institute for Theoretical Astrophysics
Title: Probing Dark Energy with the Canadian Hydrogen Intensity Mapping Experiment (CHIME)

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

4 p.m.
All Experimenters' Meeting - Curia II

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Wilson Hall Cafe

Friday, Nov. 14

- Breakfast: French bistro breakfast
- Breakfast: chorizo and egg burrito
- Smoky Mountain chicken breast sandwich
- White fish florentine
- Vegetarian eggplant lasagna
- Cuban panino
- Breakfast-for-lunch omelet bar
- New England clam chowder
- Texas-style chili
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, Nov. 14

Wednesday, Nov. 19
- Broiled tilapia with coconut curry sauce
- Crunch Asian salad
- Almond cake

Chez Leon menu
Call x3524 to make your reservation.


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From DOE Pulse

Fermilab’s Oliver Gutsche keeps LHC community computing

Fermilab's Oliver Gutsche leads worldwide computing operations for the CMS experiment. Photo: Reidar Hahn

Since he was a graduate student in Germany, Oliver Gutsche wanted to combine research in particle physics with computing for the large experiments that probe the building blocks of matter.

"When I started working on the physics data coming from one of the experiments at DESY, I was equally interested in everything that had to do with large-scale computing," said Gutsche of his time at the German laboratory. Gutsche now works at DOE’s Fermi National Accelerator Laboratory. "So I also began working on the computing side of particle physics. For me that was always the combination I wanted to do."

Gutsche’s desire to merge the two focuses has paid off. For the past four years Gutsche has been in charge of worldwide computing operations of the Large Hadron Collider’s CMS experiment, one of two experiments credited with the 2012 Higgs boson discovery. In December he was awarded the CMS Collaboration Award for his contributions to the global CMS computing system. And more recently, he has been promoted to assistant head of the Scientific Computing Division at Fermilab.

As head of CMS computing operations, Gutsche orchestrates data processing, simulations, data analysis, and transfers and manages infrastructure and many more central tasks. Monte Carlo simulations of particle interactions, for example, are a key deliverable of the CMS Computing Operations group. Monte Carlo simulations employ randomness to simulate the collisions of the LHC and their products in a statistical way.

"You have to simulate the randomness of nature," explained Gutsche. "We need Monte Carlo collisions to make sure we understand the data recorded by the CMS experiment and to compare them to the theory."

When Gutsche received his Ph.D. from the University of Hamburg in 2005, he was looking for a job to combine LHC work, large-scale computing and a U.S. postdoc experience.

"Fermilab was an ideal place to do LHC physics research and LHC computing at the same time," he said. His postdoc work led to his appointment as an application physicist at Fermilab and as the CMS computing operations lead.

Read more

Rich Blaustein

Photo of the Day

Up by the treetop

Keep looking up. Photo: Marty Murphy, AD
From Dark Energy Detectives

As the sky turns: the fall and rise of the Milky Way

The Gemini South Telescope is the telescope facility in the middle of the video to the south. The home of the DECam is on a mountain to the west, not visible in video. Image: Brian Nord, FCPA

We are swept up in a cosmic merry-go-round.

Earth spins relative to the sky — about one revolution every 24 hours.

After twilight, our nearest star, the sun removes its warm blanket of light, revealing the dancing lights overhead: Collections of aeons-old galaxies and constellations of distant stars fill the night sky. For some precious hours, we have exquisite access to these pinpricks and smudges of light that have always swirled overhead — until we bask again in the sun's rays. During the day, all blinking tapestry is still above us, but the sun washes out any hope of seeing it. Again, after dusk, familiar patterns fill the sky as the dancers return like clockwork to their positions on the celestial stage.

Read more

Brian Nord

In the News

Dark matter's new wrinkle: It may behave like a wavy fluid

From, Nov. 12, 2014

The mysterious dark matter that makes up most of the matter in the universe may behave more like wavy fluids than solid particles, helping to explain the shapes of galaxies, a new study suggests.

Dark matter is one of the greatest mysteries in the cosmos. It is thought to be an invisible and mostly intangible substance that makes up five-sixths of all matter in the universe.

Read more

Frontier Science Result: CMS

Origin of the smallest masses

Muons (red) are 18 times lighter than tau leptons (blue), so we expect Higgs decays to muon pairs to be about 300 times less common than Higgs decays to tau pairs.

Since the discovery of the Higgs boson two years ago, about 80 analyses have helped to pin down its properties. Today, we know that it does not spin, that it is mirror-symmetric, and that it decays into pairs of W bosons, pairs of Z bosons, pairs of tau leptons, and pairs of photons (through a pair of short-lived top quarks). There are even weak hints at a fifth decay mode: decays into pairs of b quarks. All of these results are in agreement with expectations for a Standard Model Higgs boson, but they are still coarse measurements with significant uncertainties.

To say that this boson is a Standard Model Higgs is to say that it is exactly the particle that was predicted in 1964. That leaves a lot of room for surprises. Without interference from new phenomena, the rate that this boson decays into particle-antiparticle pairs would be proportional to the square of the mass of the particle-antiparticle pairs. The best way to check the proportionality of something is to look at it on an extreme range. Since the Higgs is believed to give mass to everything from 0.0005-GeV electrons to 173-GeV top quarks, there's plenty of room to check.

The highest decay rates are easiest to detect, so only the heaviest particle-antiparticle pairs have been tested so far. The lightest particle-antiparticle decay that has been observed is Higgs to pairs of tau leptons, which are 1.8 GeV each. The next-lighter final state that could be observed is Higgs to pairs of muons, which are 0.1 GeV each. By the expected scaling, Higgs to muon pairs should be 300 times less common. However, muons are easy to detect and clearly identify, so they make a good target.

Even if you combine all the LHC data collected so far, it would not be enough to see evidence of this decay mode. However, the LHC is scheduled to restart next spring at almost twice its former energy. Higher energy and more intense beams would produce more Higgs bosons, making a future detection of Higgs to muon pairs possible.

To prepare for such a discovery and find potential problems early, CMS scientists searched for Higgs to muon pairs in the current data set. They didn't find any, but they did establish that no more than 0.16 percent of Higgs bosons decay into muons, only a factor of 7 from the expected number, and then they used these results to project sensitivity in future LHC data. Incidentally, the Higgs boson is the first particle known to decay into tau lepton pairs much more (6.3 percent) than muon pairs (0.023 percent). All other particles decay into taus and muons almost equally.

They also searched for Higgs decays into electrons, the lighter cousin of muons and tau leptons. Since electrons are 200 times lighter than muons, Higgs to electron pairs is expected only 0.00000051 percent of the time. None were found, though an observation would been an exciting surprise!

Jim Pivarski

These physicists contributed to this analysis.
These scientists are the recipients of the 2015 Senior Distinguished Researcher Fellowship, awarded by the LHC Physics Center at Fermilab. The selection of these researchers was made by the LHC Physics Center management board.

Wilson Fellowship accepting applications until today

Lunch and Learn Seminar - Social Security and Retirement - Nov. 19

UChicago Tuition Remission Program deadline - Nov. 24

Geometric Dimensioning and Tolerancing - Dec. 1-5 (afternoon)

Performance Goal Setting courses - enroll in TRAIN

Ramsey Auditorium horseshoe road closure

NALWO Playgroup meets Wednesdays at 5:15 at Users Center

Scottish country dancing Tuesday evenings at Kuhn Barn

International folk dancing Thursday evenings at Kuhn Barn (except Thanksgiving)

Indoor soccer

Broomball open league

Hollywood Palms Employee Appreciation Day

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