Fermilab TodayThursday, September 18, 2003  
Thursday, September 18
Workshop on Small-x and Diffractive Physics, September 17-20, 2003 at Fermilab. View program and information.
2:30 pm Theoretical Physics Seminar - Curia II
Speaker: K. Agashe, Johns Hopkins University
Title: Grand Unification in RS1, Naturally (and Without SUSY)
3:30 pm Director's Coffee Break - 2nd Flr X-Over


Friday, September 19
Workshop on Small-x and Diffractive Physics, September 17-20, 2003 at Fermilab. View program and information.
3:30 pm Wine & Cheese - 2nd Flr X-Over
4:00 pm Joint Experimental Theoretical Physics Seminar - 1 West
Speaker: M. Arneodo, UniversitÓ del Piemonte Orientale, Novara and INFN-Torino
Title: Diffraction at High Energy Colliders

Thursday, September 18
Garden vegetable soup
Bratwurst w/sauerkraut and potatoes $4.75
Quiche Lorraine $3.50
Muffaletta sandwich $4.75
Grilled turkey reuben $4.75

Eurest Dining Center Weekly Menu
Chez Leon
WeatherMostly Sunny 83º/55º

Extended Forecast

Weather at Fermilab


Secon Level 3

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Fermilab Result of the Week

Fermilab Result of the Week
Today, Fermilab Today launches a new feature. Each Thursday, Fermilab Today will bring readers a new scientific result from ongoing research at Fermilab. Today's inaugural story features two results, one from CDF and one from DZero, both focusing on the fascinating search for extra dimensions beyond the familiar three of space and one of time. Future Thursdays will bring more forefront results from the collider collaborations as well as from neutrino experiments, astrophysics and accelerator physics research.

DZero: Particle Pairs and Monojets
The hypothesis of extra dimensions in space large enough to be detectable by existing or near-future experiments is by far the most revolutionary attempt to solve the hierarchy problem of the Standard Model. No wonder it has captured the public's imagination and inspired experimentalists around the world.

In 2000, DZero pioneered searches for extra dimensions at proton colliders by looking for anomalies in the production of pairs of electrons and photons due to the effects of gravitational interaction amplified by extra space. Two years later DZero was first to look for production of "monojets" - single remnants of a quark or a gluon recoiling against the invisible graviton disappearing in extra dimensions.

Now, with the higher energy of the Tevatron and more data, DZero continues the quest. In the new result unveiled at Lepton-Photon 2003, DZero has extended the search by looking for pairs of electrons, photons, and muonsand set the most stringent limits on their existence to date.

While no evidence for extra space has been found so far, we plan to increase our sensitivity by another factor of two in the next three years.

CDF: The Bulk and The Brane
We may live in a world that has more than the usual four dimensions (one time dimension + 3 space dimensions) of our everyday experience. Indeed, one way to explain the peculiar properties of gravity is that the universe extends in 4+n dimensional space (the bulk) while we are trapped in the familiar 4 dimensional world (the brane).

Our website illustrates a proton and antiproton colliding in the brane to send a graviton out of the brane, carrying away energy and momentum. We observe the "missing energy" signature of this escaping graviton (called a Kaluza-Klein particle), similar to the way the existence of neutrinos is inferred in collider experiments.

The result of our analysis is to constrain at 95% confidence level the value of the effective Planck Scale for 2,4, and 6 extra dimensions to be greater than 1 TeV, 0.77 TeV, and 0.71 TeV, respectively, the best result from a direct graviton emission search at the Tevatron.

Note that the Tevatron is now running at a higher energy (approximately 2 TeV) and that we will soon have many times the data sample analyzed here. This will make us sensitive to an effective Planck Scale as high as 1.5 TeV for two extra dimensions.

Ryan Hooper, graduate student from Notre Dame (left) and Doug Chapin, postdoc from Brown University, of DZero's search for extra dimensions. Maria Spiropulu (left) of the University of Chicago and Kevin Burkett of Fermilab are working on CDF's search for extra dimensions.
In the News
Capitol FYI: AIP Bulletin of Science Policy News, September 16, 2003
Senate Appropriations Report Language on NSF
Accompanying the recently drafted Senate FY 2004 VA, HUD, and Independent Agencies Appropriations Bill is a report spelling out the details of the committee's recommendations regarding the National Science Foundation. Selections from Senate Report 108-143 are below; the full report may be accessed at http://thomas.loc.gov/ See FYI #114 for a summary of funding differences between the Senate and House versions of this legislation.
read more

Accelerator Update
September 15 - September 17
All shifts began in shutdown.

On Monday, the Beams Division Head revoked permission to operate all of the accelerators except for the Preaccelerator. Before an accelerator can run again each accelerator will have to perform the required safety checks and complete a restart form, which the Division Head must approve. Around 9 AM the power for the MI-8 transfer line from Booster to the Main Injector (MI) was switched to a generator.
Read more of the current accelerator update
View the Tevatron Luminosity Charts

Third Annual Writing Contest
The Fermilab Creative Writers Club announces the Third Annual Writing Contest. Winners will get cash prizes! Participation is open to all members of Fermilab family. Entries will be judged in three categories: Short story (no more than 5000 words), Short-short story (less than 500 words) and Poetry (50 lines or less). Entries must be received no later than September 30. Results will be announced October 31.
more information

Doubles Tennis League
Play is held on Sundays from 4-8 p.m. in the Recreation Facility. You must be a current Recreation Facility member to participate. League begins October 26. Contact Steve Kuhlmann for more information.

Borders - Corporate Appreciation Days
The Borders bookstore in Geneva will include employees of Fermilab in their Corporate Appreciation Days. From September 19-25, all employees will receive a 20% discount on most items in the Geneva store. Bring your Fermilab ID to receive the discount.

Fermilab Today