present, all the data obtained from the many experiments in particle physics
are in agreement with the Standard Model. In the Standard Model, there
is one particle, the Higgs particle, that is responsible for giving masses to
all the particles with mass. In this sense, the Higgs particle occupies
a unique position.
Before the later part of the year 2000, the Higgs particle was not observed experimentally. After the center-of-mass energy at the LEP accelerator of CERN reached 205 GeV in 2000, excess candidates began to show up in the standard model Higgs analysis. See ALEPH paper, Observation of an Excess in the Search for the Standard Model Higgs Boson at ALEPH Physics Letters B495 (2001) 1. These candidates are most naturally explained by the production process:
e+e- --> HZ --> four jets
of the most exciting prospects for the LHC is confirming or contradicting
this first possible evidence for the Higgs particle. The hope is therefore to
collect hundreds or thousands of Higgs events with an accurate determination
of its mass. Although the QCD backgrounds are expected to be large,
the LHC, with its high energy and luminosity, is the ideal accelerator to
study the Higgs.