Volume 96, Number 2, October 2011
|Number of page(s)||7|
|Section||The Physics of Elementary Particles and Fields|
|Published online||10 October 2011|
First measurement of the total proton-proton cross-section at the LHC energy of
Institute of Physics of the Academy of Sciences of the Czech Republic - Praha, Czech Republic, EU
2 Czech Technical University - Praha, Czech Republic, EU
3 National Institute of Chemical Physics and Biophysics NICPB - Tallinn, Estonia, EU
4 Helsinki Institute of Physics - Helsinki, Finland, EU
5 Department of Physics, University of Helsinki - Helsinki, Finland, EU
6 MTA KFKI RMKI - Budapest, Hungary, EU
7 INFN Sezione di Bari - Bari, Italy, EU
8 Dipartimento Interateneo di Fisica di Bari - Bari, Italy, EU
9 Sezione INFN di Genova - Genova, Italy, EU
10 Università degli Studi di Genova - Genova, Italy, EU
11 INFN Sezione di Pisa - Pisa, Italy, EU
12 Università degli Studi di Siena and Gruppo Collegato INFN di Siena - Siena, Italy, EU
13 CERN - Geneva, Switzerland
14 Case Western Reserve University, Department of Physics - Cleveland, OH, USA
15 Penn State University, Department of Physics - University Park, PA, USA
Accepted: 28 September 2011
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.
PACS: 13.60.Hb – Total and inclusive cross sections (including deep-inelastic processes)
© EPLA, 2011
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