First measurement of the total proton-proton cross-section at the LHC energy of √s = 7 TeV

doi:10.1209/0295-5075/96/21002

Open AccessJournal ArticleDOI

First measurement of the total proton-proton cross-section at the LHC energy of √s = 7 TeV

Georgy Antchev, +82 more

- 01 Oct 2011 -

EPL

- Vol. 96, Iss: 2, pp 21002-21012

TLDR

TOTEM has measured the differential cross-section for elastic proton-proton scattering at the LHC energy of analysing data from a short run with dedicated large-β* optics as discussed by the authors.

Abstract:

TOTEM has measured the differential cross-section for elastic proton-proton scattering at the LHC energy of analysing data from a short run with dedicated large-β* optics. A single exponential fit with a slope B=(20.1±0.2stat±0.3syst) GeV−2 describes the range of the four-momentum transfer squared |t| from 0.02 to 0.33 GeV2. After the extrapolation to |t|=0, a total elastic scattering cross-section of (24.8±0.2stat±1.2syst) mb was obtained. Applying the optical theorem and using the luminosity measurement from CMS, a total proton-proton cross-section of (98.3±0.2stat±2.8syst) mb was deduced which is in good agreement with the expectation from the overall fit of previously measured data over a large range of center-of-mass energies. From the total and elastic pp cross-section measurements, an inelastic pp cross-section of was inferred.

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