Measurement of the total cross section from elastic scattering in pp collisions at root s=7 TeV with the ATLAS detector
2014 (English)In: Nuclear Physics B, ISSN 0550-3213, Vol. 889, 486-548 p.Article in journal (Refereed) Published
A measurement of the total pp cross section at the LHC at root s = 7 TeV is presented. In a special run with high-beta* beam optics, an integrated luminosity of 80 mu b(-1) was accumulated in order to measure the differential elastic cross section as a function of the Mandelstam momentum transfer variable t. The measurement is performed with the ALFA sub-detector of ATLAS. Using a fit to the differential elastic cross section in the vertical bar t vertical bar range from 0.01 GeV2 to 0.1 GeV2 to extrapolate to vertical bar t vertical bar --> 0, the total cross section, sigma(tot)(pp --> X), is measured via the optical theorem to be:
sigma(tot)(pp --> X) = 95.35 +/- 0.38 (stat.) +/- 1.25 (exp.) +/- 0.37 (extr.) mb,
where the first error is statistical, the second accounts for all experimental systematic uncertainties and the last is related to uncertainties in the extrapolation to vertical bar t vertical bar --> 0. In addition, the slope of the elastic cross section at small vertical bar t vertical bar is determined to be B = 19.73 +/- 0.14 (stat.) +/- 0.26 (syst.) GeV-2.
Place, publisher, year, edition, pages
2014. Vol. 889, 486-548 p.
IdentifiersURN: urn:nbn:se:uu:diva-244552DOI: 10.1016/j.nuclphysb.2014.10.019ISI: 000347016900021OAI: oai:DiVA.org:uu-244552DiVA: diva2:789191
ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1016/j.nuclphysb.2014.10.0192015-02-182015-02-182015-02-18Bibliographically approved