Friday, April 20, 2001, 16:00
WHGA Auditorium
Dr. A. Schöning, ETHZ
Abstract:
At HERA electrons (positrons) and protons are collided
at a center-of-mass energy of sqrt(s)=320(300) GeV.
Since start-up of HERA in 1992 a total integrated luminosity
of about 120/pb in e+p scattering and 15/pb in e-p scattering
have been collected by each of the two collider experiments H1 and ZEUS.
Electron (positron)-quark interactions are tested at highest
energies giving direct access to new phenomena like Leptoquarks,
Supersymmetry, substructure of quarks (compositeness),
lepton flavour violation or anomalous production of top quarks.
Indirect searches for four-fermion contact interactions were
used to probe the existence of new particles or large extra dimension
at the TeV scale.
Various searches for new physics processes have been performed
and most recent results from the 1999/2000 run are presented.
Since fall 2000 the HERA collider is upgraded in order to provide
5 times higher luminosity. In addition longitudinally polarised
electron (positron) beams will become available.
That allows for tests of the helicity of the interaction and can
be used to increase the sensitivity to new physics processes.
Prospects for new searches after the HERA upgrade are given.