PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Strong Interactions and Hadron Physics
Measurements of elastic $pp$ interactions and exclusive production with the ATLAS detector
L. Adamczyk*  on behalf of the ATLAS Collaboration
Full text: pdf
Published on: August 02, 2019
The total proton--proton($pp$) cross section is a fundamental observable at the LHC. It can be derived from the measurement of the elastic cross section, using the optical theorem. Measurements of the elastic $pp$ cross section were performed at a center-of-mass energy of 8 TeV at various settings of the beam optics using the ALFA detector. Using a fit to the differential elastic cross section in the $-t$ range from 0.014 GeV$^2$ to 0.1 GeV$^2$ to extrapolate $t\rightarrow 0$, the total cross section, $\sigma_{\rm tot}(pp \rightarrow X)$, is measured via the optical theorem. In addition, the slope of the exponential function describing the elastic cross section at small $t$ is determined. The production of exclusive $\gamma\gamma \rightarrow \mu^+\mu^-$ events in $pp$ collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector, using data corresponding to an integrated luminosity of 3.2 fb$^{-1}$. The measurement is performed for a dimuon invariant mass of 12 GeV $< m_{\mu^+\mu^-} <$ 70 GeV. The integrated cross section is determined within a fiducial acceptance region of the ATLAS detector and differential cross sections are measured as a function of the dimuon invariant mass. The results are compared to theoretical predictions both with and without corrections for absorptive effects.
DOI: https://doi.org/10.22323/1.340.0045
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.