Friday, Oct. 4, 2013

Have a safe day!

Friday, Oct. 4

3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Matt Herndon, University of Wisconsin at Madison
Title: Recent SM Measurements at CMS

Saturday, Oct. 5

8 p.m.
Fermilab Arts Series - Auditorium
De Temps Antan: Foot-Stompin' Folkloric Trio from Quebec
Tickets: $22/$11

Monday, Oct. 7

2:30 p.m.
Particle Astrophysics Seminar - WH6W
Speaker: Pat Seitzer, University of Michigan
Title: Applied Astronomy: Optical Studies of Space Debris at Geosynchronous Orbit

3:30 p.m.

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

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

Ongoing and upcoming conferences at Fermilab


Take Five

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Secon Level 3

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Flags at full staff

Wilson Hall Cafe

Friday, Oct. 4

- Breakfast: potato pancakes
- Breakfast: chorizo and egg burrito
- Bratwurst and sauerkraut
- Smart cuisine: rosemary chicken breast
- Jaeger schnitzel
- German beef sandwich on a pretzel roll
- Smoked sausage and spaetzel
- German beer cheese chowder
- Texas-style chili
- Assorted pizza by the slice

Wilson Hall Cafe menu
Chez Leon

Friday, Oct. 4

Saturday, Oct. 5
- Beet, cabbage and mushroom borscht
- Phyllo-wrapped beef croustades
- Baby spinach with scallions and lemon
- Coffee ice cream with Baileys Irish cream

Wednesday, Oct. 9
- Roasted vegetables and goat cheese on herbed focaccia
- Grilled shrimp and wild rice medley
- Lemon almond butter cake

Chez Leon menu
Call x3524 to make your reservation.


Fermilab Today

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Frontier Science Result

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Special Announcement

Temporary publication changes

For the duration of the lapse in federal funding, Fermilab Today will be sent only to Fermilab employees and will not be available for viewing online. We regret the inconvenience caused by these publication changes.

In Brief

Lunchtime information session: volunteers needed for STEM community outreach

Learn about opportunities for Fermilab employees to volunteer in the community as science fair project coaches, science fair judges, job shadowing hosts and e-mentors. Fermilab's Equal Opportunity Office is currently working with two organizations, the DuPage County NAACP Branch ACT-SO (Afro-Academic, Cultural, Technological and Scientific Olympics) program and the Metea Valley High School Latino Mustangs, to help strengthen the STEM competencies of their program participants.

Representatives from both organizations will visit Fermilab on Oct. 10 at 11:30 a.m. in the Comitium. If you are interested, please plan to attend and learn how you can assist promising high-school students. Contact Dianne Engram at x4633 or Sandra Charles at x4574 for more information.

Special Announcement

Office of Science's Patricia Dehmer speaks at University of Chicago on Nov. 5

Patricia Dehmer, Deputy Director for Science Programs in the DOE Office of Science, will give a talk on Tuesday, Nov. 5, from 2 to 3:15 p.m. at the University of Chicago Harper Center. The talk is titled "Facing Our Energy Challenges in a New Era of Science."

For more information or to register for the event, visit the lecture Web page.

Photos of the Day

Praying mantises

This praying mantis was spotted at the entrance of MI60. Photo: Benjamin Galan, AD
A close-up of a praying mantis in front of FCC. Photo: Dennis Box, SCD
Praying mantises have been seen everywhere, including in front of DZero .. .Photo: Julius Borchert, BSS
... and near CDF. Photo: Julius Borchert, BSS
From symmetry

Explain it in 60 seconds: Antimatter

Antimatter is made up of particles with equal but opposite characteristics of everyday particles of matter. Consider this analogy: dig a hole, and make a hill with the earth you've excavated. Hole and hill have equal but opposite characteristics— the volume of the earth in the hill, and that of the hole where the earth was removed. For particles, properties like electrical charge are opposite to their antiparticles—one positive, one negative. Also, antimatter will annihilate its matter counterpart in a burst of energy, just like the hill will fill the hole, leaving neither.

Read more

Michael Doser

In the News

Theoretical physicists still unraveling big bang

From HPCwire, Oct. 1, 2013

It's one of the most essential questions, which speaks to the very fact of our existence: why is the universe made of matter?

Researchers at Brookhaven National Laboratory are attempting to determine why the early universe ended up with an excess of matter. Without that excess, the matter and antimatter created by the Big Bang would have cancelled each other out, leaving the universe devoid of matter. Imagine a world that contains nothing but light, no planets, no stars, no people. Theoretical physicists have long suspected there was a way to solve for this imbalance, and by doing so, shed light on our very existence. They've spent the last 50 years attempting to unravel this fundamental riddle.

Read more

Frontier Science Result: CMS

Unexpected top quarks

Matter-antimatter pairs of top quarks are thought to be an excellent signal for new physics. If more events of this kind are observed, it would be an exciting indication that we'd found something unexpected.

The Standard Model of particle physics totally rocks. It answers a ton of questions and simplifies our understanding of the matter of the universe, boiling it down to just a handful of particles and four forces. However, the Standard Model isn't a theory of everything. It's just a good working model with great, but incomplete, explanatory power. There are questions that it doesn't answer. For instance, according to the Standard Model, the mass of the Higgs boson should be huge. Yet the discovered Higgs boson has a low mass, and we don't know why.

Since the interaction between the Higgs boson and the top quark is a big reason that the Higgs mass is predicted to be so high, it stands to reason that studying top quark production — looking for anomalies between prediction and observation — would be a good place to look for answers. Perhaps some subtle and unexpected interplay between Higgs bosons and top quarks will not only reveal clues as to why the mass of the Higgs boson is unexpectedly low, but could lead to new physics that has an even wider applicability.

The top quark is the heaviest known subatomic particle, so there are only a handful of ways in which a matter-antimatter pair of top quarks can be made. It's just pretty hard to concentrate enough energy in the right way to make two of them, and they are therefore relatively rare, even at the LHC. Note that "relatively rare" means that the LHC can make about one top matter-antimatter pair per second. That's much lower than the maximum collision rate at the LHC, which can approach a billion per second.

If making top matter-antimatter pairs is rare, making hypothetical higher-energy particles is rarer still. But given that these hypothetical particles have a huge mass, it is energetically possible for them to decay into a top matter-antimatter pair. This uncommon decay combined with the relative rareness of top quark production means that these kinds of events are fertile ground for searching for heavy and as-yet-undiscovered particles: Since top quark production is relatively rare, potential new particles that decay into top quarks won't be buried under the deluge that occurs when lighter decay particles are studied.

For this and myriad other reasons, looking at the production of top quark matter-antimatter pairs and comparing the measurement to the prediction is considered to be a likely way to find new physical phenomena. CMS scientists looked for an unexpected excess in the number of pairs of top quarks, but no excess was observed. The Standard Model continues to reign, and scientists continue to poke at it, trying to find cracks in the theory.

Don Lincoln

These US CMS scientists contributed to this analysis.
These Fermilab-based staff play crucial administrative roles in ensuring that the CMS Center, the LHC Physics Center and the US CMS Operations Program all function smoothly.

Today's New Announcements

Lepton flavor violation course in academic lecture series begins Oct. 8

Pizza's on us! Learn about volunteer opportunities with the Education Office - Oct. 9

Fermilab Arts Series Presents De Temps Antan - Oct. 5

Fermilab Lecture Series: The Physics of Superheroes - Oct. 11

Power Writing Workshop offered Oct. 24

Writing for Results: Email and More class offered Dec. 11

SPIE digital library online trial at Fermilab

eBook of note at the Fermilab Library

Flu vaccination information

Accelerate to a Healthy Lifestyle

NALWO "English Conversation" mornings

Indoor soccer now on Tuesdays and Thursdays

Basketball open gym on Wednesdays

Scottish country dancing Tuesday evenings at Kuhn Barn

International folk dancing Thursday evenings at Kuhn Barn

Ringling Bros. and Barnum & Bailey discounts

Find new classified ads on Fermilab Today.