The best guess of most physicists is that the Higgs weighs somewhere between 114 and 600 gigaelectronvolts
(109 electronvolts), according to Sergio Bertolucci, CERN's director for research and computing.
The Earth-orbiting craft will detect gamma rays with energies up to 300 gigaelectronvolts
(GeV), far beyond the 20 GeV energies that previous instruments in space have reached.
Experiments at the Tevatron collider at Fermilab in Batavia, Illinois, have previously searched for excited quarks, and ruled out their existence at masses up to 870 gigaelectronvolts
to enable them to penetrate the screen without creating other particles.
Their calculations used a dark matter particle with a mass of 5 gigaelectronvolts
- lighter than the one in West's simulations.
For more than 6 years, the LEP collider operated at an energy of about 91 gigaelectronvolts
(GeV) to produce electron-positron collisions of just the right energy to create large numbers of Z#161# particles.
These particles are accelerated in stages to an energy of 7 gigaelectronvolts
, then injected into a storage ring about 1 kilometer in circumference-large enough to encircle a baseball stadium.
Smashed together at 200 gigaelectronvolts
, the gold nuclei unleash their constituent particles in a 'quark-gluon plasma'.
For the one distinctive event observed at the Collider Detector at Fermilab (CDF), Kane and his coworkers offer a scenario in which the collision directly created two selectrons, each with a mass between 80 and 130 gigaelectronvolts
But, in a series of talks delivered over the next few days in the US and Europe, they are expected to announce that their WIMP candidates have a mass of 30-60 gigaelectronvolts
- roughly 30-60 times that of a single proton.
The Tevatron results specify that the Higgs boson is very unlikely to have an energy between 160 and 170 gigaelectronvolts