Speaker
Hasko Stenzel
(ATLAS)
Description
The total pp cross section is a fundamental property of the strong interaction which can not be
calculated in perturbative QCD but only described based on phenomenological models.
The ATLAS collaboration has recently measured the total inelastic protonproton
cross section
and the diffractive part of the inelastic cross section at 13 TeV in special data sets taken with
low beam currents and using forward scintillators.
A more precise measurement of the total pp cross section as well as elastic and inelastic
contributions can be extracted from a measurement of the differential elastic cross section using
the optical theorem. The ATLAS Collaboration has collected 0.5 /nb of elastic data in a
dedicated run with high beta* optics at 8 TeV centreofmass
energy with the ALFA Roman Pot
detector in order to perform this measurement. From the extrapolation of the differential elastic
cross section to t=0, using the optical theorem, the total cross section is extracted with the
luminositydependent
method with unprecedented precision. In addition the nuclear slope of the
elastic tspectrum
and the total elastic and inelastic cross sections are determined.
Primary author
Hasko Stenzel
(ATLAS)
