# DIS 2015 - XXIII. International Workshop on Deep-Inelastic Scattering and Related Subjects

27 April 2015 to 1 May 2015
US/Central timezone

## Measurement of the total cross section in pp collisions at sqrt(s)=7 TeV with the ALFA sub-detector of ATLAS

28 Apr 2015, 09:45
25m
BALLROOM WEST ()

### BALLROOM WEST

WG2 Small-x, Diffraction and Vector Mesons

### Speakers

Leszek Adamczyk (AGH University of Science and Technology (PL)) Leszek Adamczyk (AGH University of Science and Technology (PL))

### Description

The total pp cross section is a fundamental parameter of the strong interaction which cannot be calculated in QCD but still can be measured using the optical theorem, which states that the total cross section can be obtained from the extrapolation to t=0 of the differential elastic cross section measured at small four-momentum transfer t. The ATLAS Collaboration has collected 80 mub-1 of elastic data in a dedicated run with high beta* optics at 7 TeV centre-of-mass 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 luminosity-dependent method. In addition the nuclear slope of the elastic t-spectrum, the total elastic and inelastic cross sections are determined.

### Primary author

Leszek Adamczyk (AGH University of Science and Technology (PL))

 Slides