Recent cross-section, diffractive and forward multiplicity measurements with TOTEM

TOTEM is dedicated experiment at the LHC to the measurements of total cross-section, elastic scattering and diffraction. Elastically and diffractively scattered protons are measured in Roman Pots and charged particles by the T1 and T2 telescopes in the pseudorapidity range 3.1 to 6.5. TOTEM has measured the luminosity-independent total, elastic and inelastic proton-proton cross- sections at √ s = 7 TeV and 8 TeV using low-pileup runs with a dedicated β ∗ = 90 m optics. At √ s = 7 TeV, the cross-sections were also determined using the CMS luminosity giving results that are in excellent agreement with the luminosity-independent ones, despite having very different systematic dependencies. Moreover, since TOTEM is capable to detect diffractive events with masses down to 3.4 GeV, a limit on the cross section for low mass diffraction has been set from the difference between the overall inelastic cross section (measured only using elastic scattering) and visible inelastic cross section (measured using T1 and T2). The differential elastic proton- proton cross section has been measured over a wide range in | t | for √ s = 7 TeV. TOTEM has also determined double diffractive cross-section in the forward region at √ s = 7 TeV as well as studied soft single diffraction. In addition, TOTEM has performed an inclusive forward charged particle pseudorapdity density measurement in 7 TeV proton-proton collisions for the range 5.3 < | η | < 6.4 using T2. Next, TOTEM will together with CMS measure the charged particle pseudorapidity density at √ s = 8 TeV simultaneously in the central (CMS tracker) and forward (T2) region.