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02-0-1007-94/2005
Priority:1
Status: Approved for completion
in 2005

A T L A S
General-purpose pp Experiment at CERN's
Large Hadron Collider

Leader:   N.A. Russakovich

Scientific Programme:
The ATLAS Collaboration prepares a general-purpose pp experiment which would be operational at the start-up of the Large Hadron Collider (LHC) in order to exploit its full discovery potential. The LHC offers a large range of physics opportunities, among which the origin of mass at the electroweak scale is a major focus of interest. The detector optimization is therefore guided by physics issues such as sensitivity to the largest possible Higgs mass range, but also, for example, by detailed studies of very high multiplicity physics and of top quark decays, supersymmetry searches, and sensitivity to large compositeness scales. The ability to cope with a broad variety of expected physics processes also demonstrates most importantly the detector's potential for unexpected new physics.
Many of the interesting physics questions at the LHC require high luminosity, and so the primary goal of the experiment is to operate at the standard high luminosity for the LHC of 1.7· 10 34cm -2 s -1 with a detector that provides as many signatures as possible of new physics using electron, gamma, muon, jet, and missing transverse energy measurements.
Emphasis is also placed on the performance necessary for physics accessible during the initial lower luminosity running. The experiment will address more complex signatures including tau detection and heavy flavour tags to as high a luminosity as practicable.
Finally, for a restricted set of signatures, the detector is conceived for safe performance even at the highest possible luminosities which could be delivered by the LHC.

Expected main results in 2005:
List of projects:
  Project Leader Priority
(period of realisation)
1. ATLAS N.A. Russakovich 1   (1995-2005)

Collaboration   
Country or international
organization
City Institute or Laboratory
Armenia Yerevan YerPhI
Azerbaijan Baku IP ANAS
Belarus Minsk IP NASB
BSU
NC PHEP BSU
ISSP NASB
RINP BSU
Gomel GSTU
Canada Vancouver TRIUMF
Montreal UdeM
CERN Geneva
Czech Republic Prague CU
France Clermont-Ferrand LPC-CF
Orsay LAL
Georgia Tbilisi HEPI TSU
Germany Munich MPI-P
Greece Athens Univ.
Israel Rehovot WIS
Italy Pisa Univ.
The Netherlands Amsterdam NIKHEF
Russia Moscow LPI RAS
MEPhI
SSC-ITEP
CC RAS
MSU
Protvino SRC-IHEP
Slovak Republic Bratislava CU
IP SAS
Spain Barcelona IFAE
The USA Argonne, IL ANL
Uzbekistan Samarkand SSU

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