Thursday, Sept. 18, 2014

Have a safe day!

Thursday, Sept. 18

11 a.m.
Intensity Frontier Seminar Series - WH8XO
Speaker: Tingjun Yan, Fermilab
Title: Coherent Charged-Pion Production in ArgoNeuT

2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Ryosuke Sato, KEK
Title: PeV Neutrinos from Right-Handed Neutrino Dark Matter

3:30 p.m.

Friday, Sept. 19

1 p.m.
Joint Experimental-Theoretical Physics Seminar (NOTE TIME) - One West
Speaker: Fabrizio Palla, INFN Pisa and CERN
Title: The Rare Decay of Bs to μμ at CMS

3:30 p.m.

Visit the labwide calendar to view Fermilab events

Weather Mostly sunny

Extended forecast
Weather at Fermilab

Current Flag Status

Flags at full staff

Wilson Hall Cafe

Thursday, Sept. 18

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Corned beef hash and eggs
- Grilled chicken quesadilla
- Barbecue chicken breast
- Honey baked ham
- Buffalo chicken tender wrap
- Roast beef carvery
- Chef's choice soup
- White chicken chili
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, Sept. 19

Wednesday, Sept. 24
- Pan-fried catfish
- Southern-style collard greens
- Black eyed peas
- Cornbread
- Sweet potato pie

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

User University Profiles

Related content


Fermilab Today
is online at:

Send comments and suggestions to:

Visit the Fermilab
home page

Unsubscribe from Fermilab Today

From symmetry

Science gets social

If you like your science with a cup of coffee, a pint of beer or a raucous crowd, these events may be for you. Image: Sandbox Studio with Shawna X

With an explosion of informal science events popping up around the world, it's easier than ever to find ways to connect with scientists and fellow science enthusiasts.

Can't find an event near you? Start your own! There are plenty of ways to reach out to fellow organizers for support.

Science Slam
At a Science Slam, performers compete for the affection of an audience — usually registered by clap-o-meter — by giving their best short, simple explanations of their research.

The first Science Slam took place in 2004 at a festival in Darmstadt, Germany, home of the GSI Centre for Heavy Ion Research and mission control for the European Space Agency. Alex Deppert, a city employee and poet with a PhD related to science communication, adapted the idea from the competitive Poetry Slams that started in Chicago in the 1980s. Science Slams now take place across the globe.

Read more

Kathryn Jepsen

In Brief

Technical Division picnic brings out laughs and prizes

Lidija Kokoska and Don Arnold enjoy a good laugh at the picnic table. Photo: Tom Nicol, TD
Among the table full of raffle prizes, the level is the one that catches Curtis Crawford's fancy. Photo: Tom Nicol, TD
Slava Yakovlev, center, and Allan Rowe have Anna Grassellino (and possibly her new baby) in stitches. Photo: Tom Nicol, TD
Technical Division Head Hasan Padamsee cheerfully addresses the picnickers. Photo: Tom Nicol, TD

The Technical Division held its annual picnic at Kuhn Barn on Tuesday. The division members had a good time, and several won raffle prizes. Some young family members attended, too.

Video of the Day

Got a minute? Building software at the LHC

Analyzing data from the Large Hadron Collider is challenging. Around 3,000 scientists work on the problem, which means that there are 3,000 people contributing software. With such a large group, it is paramount that the code be tested to ensure that a new contribution doesn't cause the rest of the program to malfunction. Scientist Sam Hewamanage shows how the code is checked. View the video. Video: U.S. CMS
Photo of the Day

Sharp eyes catch peregrine falcon

A peregrine falcon stops to say hello on the ledge outside the Aerie conference room on the 15th floor of Wilson Hall. Photo: Robert Peterson, WDRS
In the News

Neutrinos: ghosts of the universe

From Discover, September 2014

Why, after millions of years of steadily lighting the cold darkness, does a supergiant star suddenly explode in a blinding blaze of glory brighter than 100 billion stars? What exotic objects in deep space are firing out particles at by far the highest energies in the universe? And perhaps most mind-bending, why does the universe contain any matter at all? These mysteries have vexed astrophysicists and particle physicists for decades.

Read more (subscription required)

Frontier Science Result: DZero

Newton, Schrödinger and DZero

A visualization of a force field created by a stationary object. The massive object at the center of the system creates a stationary force field; one has to determine only how a relatively light object’s motion responds to the force.  Photo courtesy University of New Mexico Department of Physics and Astronomy

Physicists who remember the past are delighted to repeat it.

Nicolaus Copernicus and Galileo Galilei both realized that the sun is pretty much stationary at the center of the solar system. Newton followed with the insight that the force holding planets in their orbits was gravity. With this, the ancient problem of predicting the motion of planets was reduced to finding the motion of an object, the planet, in response to the force exerted by stationary object, the sun. Because the sun is so heavy, it hardly moves, and the gravitational field that it creates does not change. That allows for an immense mathematical simplification. You only need to figure out how one object, the planet, moves in a stationary gravitational field.

In the early part of the 20th century, a very similar situation arose. This time, the problem was to understand the internal structure of atoms. Hydrogen is the simplest atom, containing just one proton and one electron. The force between the two isn't gravitational, but rather electric. The electron's motion is quantum mechanical, and quantum mechanics was not quite fully worked out at the time. But just as the sun is much more massive than a planet and thus can be thought of as nearly stationary, so the proton is much more massive than the electron. Niels Bohr placed the proton at the center of the atom, just as Copernicus placed the sun at the center of the solar system. Erwin Schrödinger based his solution, which underlies all of modern chemistry, upon that idea. Schrödinger only needed to figure out how one object, the electron, moves in a stationary electric field.

In 1977, the situation appeared for a third time. The discovery of the bottom quark, with a relatively large mass, in combination with the realization that mesons contained two quarks, meant that there had to be particles in which a nearly stationary heavy object, the b quark, was bound by a certain force to a light quark moving around it. In this case, the motion is quantum mechanical, just as in the hydrogen atom. The force holding the objects together is the strong nuclear force, about which we are still learning.

In these mesons, several different kinds of light quarks (or antiquarks) can surround the heavy b quark. To the extent that they all are light, they are nearly interchangeable. If the light quark is a d quark, the meson is called B0; if it is an s quark, the meson is called Bs0. In both cases, the heavy quark sits there, basically stationary, and the light quark is a bystander. This is sometimes called the spectator model of B mesons. In this model, the lifetime of the B0 and the Bs0 should be the same because the decay of these mesons is caused by the decay of the b quark. More advanced models predict that the lifetime of the Bs0 should be just a little shorter than that of the B0.

DZero recently made the most precise measurement of the lifetime of the Bs0 meson to date. Along with this, DZero measured the lifetime of the B0 meson. The idea here is that by using similar methods to measure both particles, any particular error that might creep into one measurement will also creep into the other, but then in the ratio of the lifetimes, these two will cancel.

DZero finds that the lifetime of the Bs0 is 1.479 ± 0.023 picoseconds and that the ratio of the Bs0 lifetime over the B0 lifetime is 0.964 ± 0.015. That is not very far from a ratio of 1, which is what the spectator model predicts. The prediction of more complicated unquenched lattice QCD calculations is that this ratio should lie somewhere between 0.996 and 1.000. So in this case, just remembering history gets you very close to the right answer!

Leo Bellantoni

Enrique Comacho-Pérez, Jorge Martínez-Ortega and Alberto Sánchez-Hernández, all of CINVESTAV, Mexico, are the primary analysts for this result.
Latin American countries have contributed strongly to DZero over its three-decade existence. The leaders who brought consortia from Argentina, Brazil, Colombia, Ecuador and Mexico into the collaboration are pictured here.

Today's New Announcements

Artist reception - Sept. 26

Mike Super at Fermilab - Sept. 27

Access 2010: Intermediate - Oct. 2

Interpersonal Communications Skills - Oct. 21

Excel 2010: Intermediate - Oct. 29

Writing for Results: Email and More (morning only) - Oct. 30

Managing Conflict course (morning only) - Nov. 5

Access 2010: Advanced - Nov. 12

Excel 2010: Advanced - Dec. 3

Added room locations in the FermiMail Calendar

Newly released ebook available at the Fermilab Library

NALWO Playgroup meets Wednesdays at Users Center

Abri Credit Union financial advisor

Help improve travel in Fox Valley region and to Fermilab

Indoor soccer