Thursday, August 19|
THERE WILL BE NO THEORETICAL PHYSICS SEMINAR THIS WEEK
11:45 a.m. Third Thursday Lunchtime Cleanup - Ground Floor Wilson Hall
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
THERE WILL BE NO ACCELERATOR PHYSICS AND TECHNOLOGY
Friday, August 20
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
4:00 p.m. Joint Experimental Theoretical Physics Seminar - 1 West
Speaker: N. Bell, Fermilab
Title: Cosmic Neutrinos Ė From the Highest Energies to the Lowest
Thursday, August 19|
Santa Fe Black Bean Soup
Marinara Meatball Sub $4.75
Butter Crumb Baked Fish $4.75
Sauteed Liver & Onions $3.75
Baked Ham & Swiss on a Ciabatta Roll $4.75
Sausage & Sweet Onion Strombolis $2.75
Crispy Fried Chicken Ranch Salad $4.75
Wilson Hall Cafe Menu
ITRP Announcement Tonight at Midnight|
The International Technical Recommendation Panel is expected to issue
its finding on the preferred technology for the
proposed International Linear Collider tonight at midnight Central Time.
A press release will be sent out on the
Interactions.org news wire
tonight at midnight. A link to the press release will also be available
Web site and the International Linear Collider Web site.
Accelerator Division Addresses Safety and Goals for the Upcoming Shutdown|
Earlier this week on Monday, August 16, Accelerator Division Head Roger Dixon
addressed more than 150 technicians, supervisors and tradesmen in Ramsey Auditorium
about the upcoming shutdown. Starting August 23, technicians and tradesmen from
sections and divisions across the lab will start working on various shutdown
projects, which will last at least 13 weeks. "The most important thing is to
have a very safe and effective shutdown," Dixon said. "We don't want any of you
Roger Dixon at the|
allhands meeting on
The magic word of the meeting was definitely safety, but Dixon also used the
opportunity to congratulate everyone on the success of the Tevatron over the
past year. "We were able to achieve something much greater than I could have
ever predicted," he said. "None of this could have been accomplished without
the effort all of you made during last year's monumental shutdown. All of you
made this possible, and I hope that you have another trick up your sleeve to do
Dixon outlined the major projects for the Accelerator Complex over the next
three months, which include the installation of electron cooling in the recycler,
installation of a new horn for MiniBooNE, and the completion of the NUMI Beam line
installation. Future shutdowns will address antiproton cooling upgrades
in the accumulator and beam-beam interactions in the Tevatron. "We want
to start the accelerator complex back up as rapidly and smoothly as possible,
but I cannot emphasize safety enough," Dixon said. "I want you to get things
done, but I don't want you to rush. The most important ingredient to our success
is your work. Go out there and have a safe shutdown."
Downtime Scheduled for IMAPServer1|
|Feynman Computing Center|
On August 28 and 29, IMAPServer1 will be upgraded. This
will consist of system changes as well as an upgrade to the IMAP
software. The upgrade will take several hours. The current estimate
is 12-14 hours. The work will start at 10:00 p.m. on August 28, and it should
be completed by noon on August 29.
Users of IMAPServer2 and IMAPServer3 should be aware that these servers
will undergo the same upgrade process in early September.
The upgrades will provide a number of benefits, including improved
IMAPServer performance, improved Webmail with an address book,
and Server side filters, which will allow the server to folder your mail
rather than the client.
All users will also get a new folder called "Tagged Spam" which will by
default have all mail tagged by the spam filters moved to it.
Documentation will be available online shortly for the new features.
If you have any questions or concerns please open up a ticket with the
Computing Division Helpdesk.
From Nature, August 19, 2004|
CERN: The show goes on
CERN, the centre for particle physics in Europe, has been smashing its way through the subatomic world for the past 50 years. Alison Abbott finds out what's in store for the future.
During CERN's routine maintenance shut-down in 1999, acrobats and mime artists
turned one of the vast halls within the laboratory's 27-kilometre tunnel into
a stage. Light and shadows played around the nine-storey cavern, illuminating
a poetic ballet of aerial gymnastics. On ropes, trapezes and ledges, the
performers enacted Paul Dirac's creative struggle with his 1920s theory of
antimatter and his pessimistic belief that such theories could never be
confirmed experimentally. In the show's final scene, the huge backdrop parted
to reveal the DELPHI experiment, where for the past decade CERN physicists have
been observing collisions between electrons and positrons, their antimatter
DZero on the Trail of the Tau|
The distribution of momentum of tau jets from Z decay in data (dots)
is in agreement with the expectation from the Standard Model (histogram).|
Tau leptons are elusive particles: they decay so rapidly that the DZero
apparatus can only infer their presence from their decay products. This
task is only made harder by the large fraction of the tauís momentum that is
carried off by one or more undetectable neutrinos. Taus are incredibly hard
to distinguish from other objects produced in the experiment - so why would
one even try to detect them?
One reason is that the tau lepton is a heavy lepton, a member of the same family
of fundamental particles as the electron and muon. The standard model thus
says that the tau lepton should behave very similarly to its electron and muon
cousins, and testing this is an important test of the model. Another reason is
that the much sought after Higgs boson can decay into a pair of taus. Furthermore,
the tau lepton is a potential gold-mine for many scenarios of physics beyond the
A DZero team from Brookhaven National Laboratory, Florida State University and
Nijmegen University has measured the cross section for producing tau pairs in
Z boson decays. Not only is this measurement an important test of the ability
of the DZero detector to identify tau leptons, but it also allows one to search
for other sources of taus that have been predicted by new theoretical models.
The measured cross section is in agreement with the Standard Model expectation.
However there are many other decay modes involving taus that will be searched
for hints of new physics.
Serban Protopopescu (above) and Abid Patwa (right) of BNL have performed
Z->tau tau analysis in collaboration with Cristina Galea (middle) of
Nijmegen University and Silke Nelson (left) of Florida State University. (Click on image for larger version.)|
Result of the Week Archive
August 16 - August 18|
- During this 48 hour period Operations established two stores that
contributed approx. 27 hours and 22 minutes of luminosity to the
- Booster had many GMPS problems
- The first attempt to establish a store on Monday after TeV turn on
was aborted due to emittance and coalescing problems.
- Slipstacking is now the normal mode of operations for Main Injector
- The TeV quenched during the next shot setup
View the current accelerator update
View the Tevatron Luminosity Charts
Monthly Leave Sheets Reminder|
Monthly Time Leave Sheets are due in Payroll by 10:00 a.m. on Friday August
New Book Purchase Suggestion Lists
New Book purchase suggestion lists for the week of August 17
are now available online.
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."
Please email your book purchase recommendations
from the Majors or Amazon lists, or from other sources
to Sandra Lee.