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In this issue:
Tevatron Experiments Land Fermilab in Higgs Territory
Safety Today: New Procedure for Government Vehicles and Equipment
DOE All-Hands Meeting Thursday
Register for LCLS/SSRL 2008

SLAC Today

Tuesday - August 5, 2008

Tevatron Experiments Land Fermilab in Higgs Territory

While no Higgs boson has been found yet, the new results exclude a mass for the Higgs of 170 GeV/c2 with 95 percent probability.

According to the Standard Model of particles and forces, the Higgs mechanism gives mass to elementary particles such as electrons and quarks. (Images courtesy of Femilab.)

Scientists from the CDF and DZero collaborations at the U.S. Department of Energy's Fermilab have combined Tevatron data from the two experiments to advance the quest for the long-sought Higgs boson. Their results indicate that Fermilab researchers have for the first time excluded, with 95 percent probability, a mass for the Higgs of 170 GeV. This value lies near the middle of the possible mass range for the particle established by earlier experiments. This result not only restricts the possible masses where the Higgs might lie, but it also demonstrates that the Tevatron experiments are sensitive to potential Higgs signals.

"These results mean that the Tevatron experiments are very much in the game for finding the Higgs," said Pier Oddone, director of Fermilab.

Combining results from the two collider experiments effectively doubles the data available for analysis by experimenters and allows each experimental group to cross check and confirm the other's results. In the near future, the Fermilab experimenters expect to test more and more of the available mass range for the Higgs.

See related graphics and photos from Fermilab.

Read the full announcement from Fermilab.

(Column - Safety Today)

New Procedure for Government Vehicles and Equipment

Due to several mishaps and near misses throughout the General Services Administration and Department of Energy Fleet across the country, the following safety procedure is being implemented immediately, with a revised version of SLAC Environment, Safety & Health manual chapter 13 "Vehicle and Traffic Safety."

Parking on Inclines

When parking, all vehicles must have their parking brakes set. Passenger vehicles and light duty trucks (for example, pickups) must also properly curb their wheels when parked on inclines. All carts (including electric and gas carts, neighborhood electric vehicles, and low speed vehicles), construction haulage, and delivery vehicles parked on inclines must have both their parking brake engaged and at least one wheel properly chocked.

Wheel Chocking

This procedure consists of placing a wheel chock on the downhill side of the tire (on tread face) of either the front or rear tire.


This procedure consists of rotating the front edge of your wheel into a curb when facing down an incline, or the back edge of your wheel when facing up an incline.


DOE All-Hands Meeting Thursday

The Department of Energy will hold an all-hands meeting Thursday. Secretary of Energy Samuel L. Bodman will speak to the reality of our energy and national security challenges, and will highlight the unique ability of the DOE complex to respond to those challenges both today and moving forward.

Come to Kavli Auditorium from 11:30 a.m. to 12:15 p.m. to attend.

Register for LCLS/SSRL 2008

Registration is open for the Annual Linac Coherent Light Source/Stanford Synchrotron Rearch Laboratory Users' Meeting and Workshops, October 15–18 on the SLAC campus.

This annual event is a valuable opportunity to learn about the latest plans, new developments and exciting user research at LCLS and SSRL. It is also a great time to interact with other scientists, potential colleagues, and vendors of light source related products and services.

Early registration ends October 3rd. For event details and registration, see the SSRL/LCLS User's Meeting and Workshops Web site.

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