Аннотация:THERA uses polarised electrons or positrons from the linear accelerator TESLA
at energies of 250{800 GeV and brings them into collision with high-energy protons
(500GeV to 1TeV) from HERA in the West Hall on the DESY site. THERA will thus
extend the investigation of deep inelastic scattering into an as yet unexplored kinematic
region, yielding complementary information to hadron{hadron and e+e−
colliders in the TeV energy range.
At low x, THERA off ers the possibility of uncovering a new strong-interaction domain of parton saturation, which would be a substantial step towards an understanding
of con nement. Processes such as jet production in the proton beam direction or heavy
flavour production at low x, studies of the partonic structure of the photon and a precision
measurement of the strong interaction coupling constant alpha_s make THERA an
excellent facility for investigating strong and electroweak interaction dynamics. Finally,
the high centre-of-mass energy will open a new window for the observation of
new particles or interactions, such as leptoquarks, supersymmetric particles or contact
interactions, the helicity structure of which could be particularly well investigated at
THERA.
