Skobeltsyn INP MSU
Hadronic Interactions Laboratory

A general purpose detector designed to run at the highest luminosity at the LHC (CERN) is proposed. The CMS (Compact Muon Solenoid) detector has been optimized for the search of the SM Higgs boson over a mass range from 90 GeV to 1 TeV, but it also allows detection of a wide range of possible signatures from alternative electro-weak symmetry breaking mechanisms. CMS is also well adapted for the study of top, beauty and tau physics at lower luminosities and will cover several important aspects of the heavy ion physics programme. In particular, the production of heavy quarkoniums through their muon decay channel and the energy losses of hard partonic jets, going to be valuable processes of studying for the phase transition from the hadronic matter to the plasma of deconfined quarks and gluons in central nucleus-nucleus collisions with CMS.

The energy resolution for the muons, photons and electrons will be better than 1% at 100 GeV. At the core of the CMS detector sits a large superconducting solenoid generating a uniform magnetic field of 4 T. The choice of a strong magnetic field leads to a compact design for the muon spectrometer without compromising the momentum resolution up to rapidities of 2.5. The inner tracking system will measure all high pt charged tracks with a momentum precision of Delta(p)/p ~ 0.1 pt (pt in TeV) in the range |eta| < 2.5. A high resolution crystal electromagnetic calorimeter, designed to detect the two photon decay of an intermediate mass Higgs, is located inside the coil. Hermetic hadronic calorimeters surround the intersection region up to |eta| = 4.7 allowing tagging of forward jets and measurement of missing transverse energy.

This is a project to build a state-of-the-art 4-pi hermetic spectrometer to detect the production and decays of mesons produced in photon-induced reactions. The goal is a systematic study of the meson spectrum up to about 2.5 GeV/c2 - below the threshold for charm production - to search for unusual mesons and gluonic excitations. Such a study, over the desired meson mass range, requires photon energies from 8 to 10 GeV. The January, 1998 Road Map for Jefferson Lab lays out a plan for such an energy upgrade from the current 4 GeV CEBAF accelerator. To accommodate the spectrometer, a new experimental hall (Hall D) would be built with a beamline to deliver electrons from the stub of the North Linac of the CEBAF accelerator complex.