The TOTEM collaboration has measured the proton-proton total cross section at √s=8 TeV using a luminosity-independent method. In LHC fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of ∼90% of the nuclear elastic scattering events. Simultaneously the inelastic scattering rate has been measured by the T1 and T2 telescopes. By applying the optical theorem, the total proton-proton cross section of (101.7±2.9) mb has been determined, well in agreement with the extrapolation from lower energies. This method also allows one to derive the luminosity-independent elastic and inelastic cross sections: σel=(27.1±1.4) mb; σinel=(74. 7±1.7) mb.
Luminosity-independent measurement of the proton-proton total cross section at √s=8 TeV
BOZZO, MARCO;FERRETTI, ROBERTA;FERRO, FABRIZIO;LO VETERE, MAURIZIO;ROBUTTI, ENRICO;SANTRONI, ALBERTO;
2013-01-01
Abstract
The TOTEM collaboration has measured the proton-proton total cross section at √s=8 TeV using a luminosity-independent method. In LHC fills with dedicated beam optics, the Roman pots have been inserted very close to the beam allowing the detection of ∼90% of the nuclear elastic scattering events. Simultaneously the inelastic scattering rate has been measured by the T1 and T2 telescopes. By applying the optical theorem, the total proton-proton cross section of (101.7±2.9) mb has been determined, well in agreement with the extrapolation from lower energies. This method also allows one to derive the luminosity-independent elastic and inelastic cross sections: σel=(27.1±1.4) mb; σinel=(74. 7±1.7) mb.
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