![Calendar](http://www.fnal.gov/pub/today/images/title_calendar.gif)
DASTOW and Earth Day Today!
The DASTOW information table is located in the atrium of Wilson Hall.
If you plan to participate in the Earth Day activities, don't forget to
bring a pair of boots. We hope everyone has a fun and safe day!
Schedule of events
Thursday, April 22
2:30 p.m. Theoretical Physics Seminar - Curia II
Speaker: A. Mitov, University of Hawaii
Title: Perturbative Heavy Quark Fragmentation Function at NNLO
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
THERE WILL BE NO ACCELERATOR PHYSICS AND TECHNOLOGY
SEMINAR TODAY
Friday, April 23
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
4:00 p.m. Joint Experimental Theoretical Physics Seminar - 1 West
Speaker: J. Collar, University of Chicago
Title: Review of Axion Searches
8:00 p.m. Fermilab Lecture Series - Auditorium
Speaker: Dr. Barry Barish
Title: Einstein's Unfinished Symphony: Sounds from the Distant Universe
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![Cafeteria](http://www.fnal.gov/pub/today/images/title_cafeteria.gif)
Wilson Hall Cafe Grand Opening
Thursday, April 22
Southwestern Chicken Tortilla
Philly Style Cheese Steak $4.75
Baked Fish with Roasted Leeks and Peppers $3.75
Tomato Basil Chicken Parmesan $3.75
Classic Cuban Panini $4.75
Cheesy Breadsticks $1.85
Marinated Grilled Chicken Caesar Salads $4.75
Today's Special: Free Samples from Kellogg's
Wilson Hall Cafe Menu
Chez Leon
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![Weather](http://www.fnal.gov/pub/today/images/title_weather2.gif)
![Security](http://www.fnal.gov/pub/today/images/title_security2.gif)
![Search](http://www.fnal.gov/pub/today/images/title_search.gif)
![Information](http://www.fnal.gov/pub/today/images/title_info2.gif)
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Historic Prairie Schooner Arrives at Fermilab
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Tennessee and Kimberly Stewart (left) with docents and staff from the Education Office.
(Click on image for larger version.) |
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Friday, April 16, a prairie schooner from the turn of the 20th century arrived at
the Lederman Science Center. The education office purchased the canvas-topped wagon
from "Tennessee" John Stewart, who, along with his wife Kimberly, brought the wagon
by truck from Cookeville, Tennessee.
"This has been a dream of ours for years," said Priscilla Meldrim from the Education
Office. "We started searching the Internet last spring, found Tennessee Stewart's Web
site, and now we have an authentic prairie schooner to use for student programs."
The schooner will be a feature of the "From Beneath the Ashes" field trip for grades 3-5.
In the classroom unit, students learn about the prairie as they study Illinois history,
read pioneers' letters and read a book about a young girl who moves to the Dakota Territory.
About 4,000 students of this program visit Fermilab every year to experience the prairie firsthand.
Beginning April 30, docents will use the schooner to illustrate what a pioneer family's trip
across the prairie was really like.
The education office welcomes employees and their families to view the schooner, located
next to the Science Center, but asks that visitors please do not climb on it.
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![Accelerator Update](http://www.fnal.gov/pub/today/images/title_accelupdate.gif)
April 19 - April 21
- During this period of time Operations established two stores that
provided approximately 27 hours and 30 minutes of luminosity to the experiments.
- The TeV suffers a quench on a proton abort.
- A power glitch tripped off some devices but doesn't bother the stack or store.
- Tornado warnings drive operators to basement.
View the current accelerator update
View the Tevatron Luminosity Charts
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From Wired News, April 19, 2004:
Neutrino Miners Get Down, Dirty
By Michelle Delio
Thousands of feet below the Earth's surface, scientists around the world are happily engaged
in studying the birth of our universe and its possible destruction.
To properly study neutrinos -- those perky, almost invisible particles carrying
messages from deep outer space -- to fully explore the cosmic mystery glue known
as dark matter, to verify whether some rogue nation is furtively developing nuclear
weapons and testing them deep underground, and to develop computer chips that don't
contain flaws caused by subatomic particles, scientists need to work in deep burrows
beneath the Earth's surface. They need to be far away from the bombardment of cosmic rays
and seismic noise that interferes with delicate experiments.
read more
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New World Average for the Top Quark Mass
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Comparison of the measurements of the top-quark
mass and their average. (Click on image for larger version.)
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The top quark is the most massive fundamental particle known
today. Discovered less than 10 years ago by the CDF and
DZero experiments during Tevatron's Run I (1992-1996), its
mass was measured in all possible decay modes. For better
precision the results of the two experiments can be
combined. This was done in 1999 resulting in a world average
top mass of 174.3+-5.1 GeV.
Since then, the DZero collaboration performed a very precise
mass measurement in the lepton+jets channel based on Run I
data, exploiting a new analysis technique.
When the DZero and CDF Run I results are combined once again,
the new world average is 178.0+-4.3 GeV. The above figure shows a
comparison of all results. This combination extends the
fruitful collaboration of CDF and DZero within the
Tevatron electroweak working group
from W/Z
physics to top physics.
Some properties of the electroweak interaction depend
strongly on the top-quark mass and weakly on the mass of the
Higgs boson: the all-important particle in the Standard
Model which has yet to be observed. With the increase in
measured top-quark mass, the predicted upper limit on the
mass of the Standard Model Higgs boson increases by 32 GeV
to 251 GeV. This extends the mass range that should be
covered in the direct Higgs boson searches, such as those of
CDF and DZero.
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Members of the Tevatron Electroweak Working Group,
Emanuela Barberis (left), Northeastern University, and
Martin Grunewald (right), University College Dublin,
collaborated on the top-mass combination.
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Result of the Week Archive
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![Announcements](http://www.fnal.gov/pub/today/images/title_announcements.gif)
Spring Fling Book Fair - April 21 & 22
Fermilab's Recreation Office will sponsor its "Spring Fling" Book
Fair, hosted by Books are Fun, in the Atrium on Wednesday,
April 21 from 10:00 a.m. until 6:00 p.m. and on Thursday,
April 22 from 7:00 a.m. until 3:00 p.m.
New Book Purchase Suggestions
New Book purchase suggestion lists for the week of April 20
are now available.
These include Majors book lists in four subject areas.
There is also an Amazon suggestion list in the form of a shopping cart,
viewable by entering the password "library."
Reminder: 2004 Tollestrup Award Deadline
The nomination material for the 2004 Tollestrup
Award for Outstanding Postdoctoral Research is due at the
Users' Office on April 30. All material must be on paper:
no email submissions will be considered. For complete
details please review the award announcement online.
Fermilab Lecture Series
Dr. Barry C. Barish, Professor of Physics at Caltech and Director of the
LIGO Laboratory, will present Einstein's Unfinished Symphony: Sounds from the Distant Universe on
April 23, 2004 at 8 p.m. in Ramsey Auditorium. Tickets are $5.
more information
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