Thursday, June 23
2:30 p.m. Theoretical Physics Seminar - Curia II
Speaker: A. Weiler, Technische Universitat, Munich
Title: Impact of Extra-Dimensional Physics on Rare Kaon Decays
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
THERE WILL BE NO ACCELERATOR PHYSICS AND TECHNOLOGY SEMINAR TODAY
Friday, June 24
10:00 a.m. - 5:30 p.m. Tevatron Connection - Ramsey Auditorium
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
8:00 p.m. Fermilab Film Series - Ramsey Auditorium
Title: This is Spinal Tap
THERE WILL BE NO JOINT EXPERIMENTAL THEORETICAL PHYSICS SEMINAR THIS WEEK
Saturday, June 25
9:00 a.m. - 12:00 p.m. Tevatron Connection - Ramsey Auditorium
8:00 p.m. Fermilab Arts Series - Ramsey Auditorium
Title: Cascada de Flores
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Thursday, June 23
Santa Fe Black Bean Soup
Sloppy Joe $4.85
Tex-Mex Lasagna $3.75
Sauteed Liver and Onions $3.75
Baked Ham and Swiss on a Ciabatta Roll $4.85
California Pizza $3.00
Crispy Fried Chicken Ranch Salad $4.85
The Wilson Hall Cafe now accepts Visa, Master Card, Discover and
American Express at Cash Register #1.
Wilson Hall Cafe Menu
Chez Leon
is now open. Call x4512 to make your
reservation.
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Faces of DASTOW Will Set Enthusiastic Tone Today
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The annual group photo kicks off DASTOW '05 today at 8:30 a.m. on the front steps of Wilson Hall. (Click on image for larger version.) |
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DASTOW '05 gets rolling at 8:30 a.m. today with the group portrait on the front steps of
Wilson Hall, and Fermilab user Pierrick Hanlet of MINOS and the Illinois Institute of
Technology views this annual assemblage of young smiling faces as both genuine and encouraging.
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Pierrick Hanlet |
"It's been a long time since I've had the impression that 'pure' research is well supported
in our society," says Hanlet. "However, I am always heartened when I see the enthusiasm of
young people when they come for DASTOW. For them, even if they don't end up studying physics,
it's still cool stuff. My daughters, 14 and 12 years of age, are very excited about coming
this year. I find this is encouraging. And I'm happy to learn that some new activities are
geared for their age group."
A new parallel program will be underway in One West, designed for youngsters around middle
school age. At 9 a.m., Don Lincoln of DZero illustrates physics principles of Forces and
Motion. At 10 a.m., Debbie Harris of Particle Physics Division's new Neutrino Department
discusses Physics in the Real World. At 11 a.m., Linda Valerio of Accelerator Division's
Mechanical Support Department hosts a presentation on the Physics of Sports. And there's
another new activity on tap: at 9 a.m., 10 a.m. or 11 a.m., you can meet guides at the
Covered Wagon outside the Lederman Science Education Center for Pioneer Adventures on
the Fermilab Prairie Trail.
Following the group portrait at 8:30 a.m., there will be an assembly for all participants at
8:45 a.m. in Ramsey Auditorium to go over the schedule and safety guidelines. The events
geared for younger kids will begin with The Cryo Show, with Jerry Zimmerman on stage at 9
a.m in Ramsey Auditorium. At 10 a.m., the bus will load at the front steps of Wilson Hall
for the ride to the Fire Department, and from there on to the buffalo pasture at 11 a.m.
Then it's back to Wilson Hall for a hot dog lunch (no signups required). After lunch,
parents are free to have their children visit them at their workplace, always depending on
permission on supervisors and careful attention to safety rules.
Plan to have a fun day - and a safe one.
Information and schedule
--Mike Perricone
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Status Report by GDE Director Barry Barish
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International Technology Recommendation Panel. Front row,
left to right: Akira Masaike, George Kalmus, Volker Soergel, Barry Barish, Giorgio
Bellettini, Hirotaka Sugawara,Paul Grannis Back row: Gyung-Su Lee, Jean-Eude Augustin,
David Plane (secretary), Jonathan Bagger, Norbert Holtkamp, Katsunobu Oide (Click
on image for larger version.) |
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Today, I want to briefly describe the process that led to choosing superconducting rf technology as the
basis of the main linac technology for the global design effort. As I discussed last week, a decade of
extensive R&D toward a linear collider demonstrated that it would be possible to build a linear collider
using either room temperature copper structures or using superconducting rf cavities.
Read more
Linear Collider News Archive
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From Interactions News Wire, June 20, 2005
G-Zero Finds that Ghostly Strange Quarks Influence Proton Structure
In research performed at the Department of Energy's Jefferson Lab, nuclear physicists have
found that strange quarks do contribute to the structure of the proton. This result indicates
that, just as previous experiments have hinted, strange quarks in the proton's quark-gluon sea
contribute to a proton's properties. The result comes from work performed by the G-Zero collaboration,
an international group of 108 physicists from 19 institutions and was presented at a Jefferson Lab
physics seminar June 17.
Read more
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Observing the Top with Electrons and Muons
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Diagram showing the pair production and the
decays of top quark into W bosons and bottom quarks. The subsequent decays
of W bosons result in a dilepton signature. |
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The discovery of the top quark at Fermilab's Tevatron collider in
1995 by the CDF and DZero collaborations provided direct experimental
evidence for the three generation structure of the Standard Model.
Because of the small production rate of top-antitop pairs (about one
in a few billion proton-antiproton collisions), many properties of the
top quark have yet to be explored in detail. A precise measurement of
the top-antitop production rate in all its final states is a powerful
tool to test that the observed particle has indeed the properties
expected for the top quark.
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Bob Kehoe |
As the heaviest elementary particle, the top quark has an extremely
short lifetime, decaying immediately into a lighter bottom quark and
a W boson. Both bottom quark and W boson, which are also unstable,
then decay into lighter particles. A W boson can decay to either a
light quark pair or a lepton-neutrino pair. The W decays determine
the final-state signatures of top-antitop pairs. The events in which
both W bosons (one from the top quark and the other from antitop quark)
decay into leptons (electrons/muons and neutrinos) have the rare "dilepton"
signature. If only one of the W bosons decays into leptons, the events
have the so called "lepton+jet" signature.
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The figure shows the predicted number of dilepton events
from top quark decays (red) and the background processes in events with 0, 1 and 2
or more jets of hadrons. The points show the number of events observed by DZero.
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Thanks to the improved lepton identification capabilities of the DZero Run
II detector and the much larger datasets offered by the Run II of the
Tevatron, it is possible to observe unambiguously for the first time the
top quark in the rare dilepton final states. Within the precision of this
new measurement the production rate is in good agreement with both the
standard model and the production rate measured by DZero in the lepton+jet
final state.
Full article submitted for publication
Longer plain English summary
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(Left to right) (Top) Joe Kozminski (Michigan), Stefan Anderson (Arizona),
Prolay Kumar Mal (TIFR), (bottom) Christophe Clement (Stockholm), Jessica Leveque (Arizona), and Bob
Kehoe (Southern Methodist University, pictured above) have
contributed to this result.(Click on image for larger version.) |
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Electrical engineer John Anderson (left) and technician Mike Cherry
are among those who provide invaluable technical support for the Dzero
calorimeter and muon systems. The
excellent performance of these systems is central to the measurement
presented here. |
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Result of the Week Archive
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Tevatron Connection
Save the date! The second annual Tevatron Connection
will take place Friday and Saturday in Ramsey Auditorium, offering a series of CDF and DZero presentations with theoretical perspectives.
2-for-1 Tickets for Symmetry Premiere
Until July 10, Victory Gardens Theater in Chicago will show the
play Symmetry, the world premiere of David C. Field's drama pitting
big business, pure science and power politics. Set in present time,
the play portraits a brilliant young physicist determined to escape
the obscurity of his small southwestern university. To receive tickets
at a 2-for-1 discount, Fermilab employees should call 773-871-3000 and
mention this announcement. more information
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