Fermilab Today Tuesday, May 18, 2010

Have a safe day!

Tuesday, May 18
10:30 a.m.
Particle Astrophysics Seminar - The Dark Side (WH-6W)
Speaker: Cristiano Galbiati, Princeton University
Title: E-1000: DarkSide - Search for Dark Matter with Depleted Argon
3:30 p.m.
4 p.m.
Accelerator Physics and Technology Seminar - Comitium
Speaker: Holger Witte, University of Oxford
Title: PAMELA - A Novel Accelerator for Charged Particle Therapy

Wednesday, May 19
3:30 p.m.

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Wilson Hall Cafe

Tuesday, May 18
- Breakfast: Bagel sandwich
- Chicken & rice soup
- Italian sausage w/peppers & onions
- Beef stroganoff
- Chicken lemon
- Peppered beef
- Assorted sliced pizza
- Chicken tostadas

Wilson Hall Cafe Menu

Chez Leon

Wednesday, May 19
- Assortment of quiches
- Salad of field greens with raspberry vinaigrette
- Fresh fruit plate

Thursday, May 20
- Gazpacho
- Paella
(Saffron rice with seafood & chicken)
- Torta moca

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Call x3524 to make your reservation.


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Fermilab scientists find evidence for significant matter-antimatter asymmetry

The DZero collaboration has found evidence for a new way in which elementary particles break the matter-antimatter symmetry of nature. This new type of CP violation is in disagreement with the predictions of the theoretical framework known as the Standard Model of particles and their interactions. The effect ultimately may help to explain why the universe is filled with matter while antimatter disappeared shortly after the big bang. Credit: DZero collaboration

Batavia, Ill.-Scientists of the DZero collaboration at the Department of Energy's Fermi National Accelerator Laboratory announced Friday, May 14, that they have found evidence for significant violation of matter-antimatter symmetry in the behavior of particles containing bottom quarks beyond what is expected in the current theory, the Standard Model of particle physics. The new result, submitted for publication in Physical Review D by the DZero collaboration, an international team of 500 physicists, indicates a one percent difference between the production of pairs of muons and pairs of antimuons in the decay of B mesons produced in high-energy collisions at Fermilab's Tevatron particle collider.

The dominance of matter that we observe in the universe is possible only if there are differences in the behavior of particles and antiparticles. Although physicists have observed such differences (called "CP violation") in particle behavior for decades, these known differences are much too small to explain the observed dominance of matter over antimatter in the universe and are fully consistent with the Standard Model. If confirmed by further observations and analysis, the effect seen by DZero physicists could represent another step towards understanding the observed matter dominance by pointing to new physics phenomena beyond what we know today.

Using unique features of their precision detector and newly developed analysis methods, the DZero scientists have shown that the probability that this measurement is consistent with any known effect is below 0.1 percent (3.2 standard deviations).

"This exciting new result provides evidence of deviations from the present theory in the decays of B mesons, in agreement with earlier hints," said Dmitri Denisov, co-spokesperson of the DZero experiment, one of two collider experiments at the Tevatron collider. Last year, physicists at both Tevatron experiments, DZero and CDF, observed such hints in studying particles made of a bottom quark and a strange quark.

Read more

Photo of the Day

New employees - May 3

Mike Irvin, FESS; Ben Vosmek, AD; Erik Voirin, PPD; Daisy Yuhas, DIR.
In the News

A new clue to explain human existence

From New York Times, May 17, 2010

Physicists at the Fermi National Accelerator Laboratory are reporting that they have discovered a new clue that could help unravel one of the biggest mysteries of cosmology: why the universe is composed of matter and not its evil-twin opposite, antimatter. If confirmed, the finding portends fundamental discoveries at the new Large Hadron Collider outside Geneva, as well as a possible explanation for our own existence.

In a mathematically perfect universe, we would be less than dead; we would never have existed. According to the basic precepts of Einsteinian relativity and quantum mechanics, equal amounts of matter and antimatter should have been created in the Big Bang and then immediately annihilated each other in a blaze of lethal energy, leaving a big fat goose egg with which to make to make stars, galaxies and us. And yet we exist, and physicists (among others) would dearly like to know why.

Read more

Director's Corner

On vacation

Fermilab Director Pier Oddone is on vacation. His column, which regularly appears on Tuesdays, will return next week.

Special Announcement

WDRS website gets a makeover

The WDRS site is now easy to navigate and will be regularly updated.

The Workforce Development and Resources Section at Fermilab has a fresh new face online, thanks to a makeover of the section's website.

The new site, besides having a crisp, clean new look, allows users quick and easy access to forms, policies and news. It features more informative Users and Visa webpages and new calendars for the Benefits, Diversity, Recreation and Professional Development Departments as well as the section office and Children's Center.

The site's organization takes a more customer service approach for individuals at the lab and those who may wish to work here. An updated career site will help Fermilab to attract new talent. It features an updated jobs site and points to Fermilab recruitment videos on YouTube.

Accelerator Update

May 14-17

- Four stores provided ~37.75 hours of luminosity
- Store 7812 aborted and quenched sectors BZero, DZero, D1, and F1
- Meson MTest 1005 experiment ready for beam on 5/17/10
- Kautzky valve repaired at D1
- Vacuum valve repaired at D1

*The Integrated Luminosityfor the period from 5/10/10 to 5/17/10 was 61.08 inverse picobarns. NuMI reported receiving 7.33E18 protons on target during this same period./p>

Read the Current Accelerator Update
Read the Early Bird Report
View the Tevatron Luminosity Charts


Employee Health & Fitness Day is Wednesday

News at Toastmasters

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News for Cigna plan participants

May habitat restoration - May 22

May "Benefits Bulletin" now available

Artist Reception - 5-7 p.m. on May 14

Argentine Tango Wednesdays through May 26

NALWO Children's Playgroup International Party - May 14

English country dancing - May 16

Pool memberships available now

NALWO Spring Tea - May 20

Sand Volleyball Tuesdays begin May 25

43rd Fermilab Users' Meeting - June 2-3, register now

SciTech summer camps start June 14

Employee discount at Batavia Rosati's

Fermilab Arts Series presents Corky Siegel and Chamber Blues - June 26

ANSYS Mechanical Application classes offered in May

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