Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-10-27
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 4 figures (6 eps files),latex class file dis04.cls included, to be published in the proceedings of the DIS2004, Strbs
Scientific paper
The TOTEM experiment with its detectors in the forward region of CMS and the Roman Pots along the beam line will determine the total pp cross-section via the optical theorem by measuring both the elastic cross-section and the total inelastic rate. TOTEM will have dedicated runs with special high-beta* beam optics and a reduced number of proton bunches resulting in a low effective luminosity between 1.6 x 10^{28} cm^{-2} s^{-1} and 2.4 x 10^{29} cm^{-2} s^{-1}. In these special conditions also an absolute luminosity measurement will be made, allowing the calibration of the CMS luminosity monitors needed at higher luminosities. The acceptance of more than 90 % of all leading protons in the Roman Pot system, together with CMS's central and TOTEM's forward detectors extending to a maximum rapidity of 6.5, makes the combined CMS+TOTEM experiment a unique instrument for exploring diffractive processes. Scenarios for running at higher luminosities necessary for hard diffractive phenomena with low cross-sections are under study.
Deile Mario
for the TOTEM Collaboration
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