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Measurement of the total cross section from elastic scattering in pp collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

The ATLAS collaboration
Nucl.Phys. B889 (2014) 486-548, 2014

Abstract (data abstract)
CERN-LHC. A measurement of the total $pp$ cross section at the LHC at $\sqrt{s}=7$ TeV is presented. In a special run with high-$\beta^{\star}$ 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 $|t|$ range from 0.01 GeV$^2$ to 0.1 GeV$^2$ to extrapolate to $|t|\rightarrow 0$, the total cross section, $\sigma_{\mathrm{tot}}(pp\rightarrow X)$, is measured via the optical theorem to be: $$\sigma_{\mathrm{tot}}(pp\rightarrow X) = 95.35 \; \pm 0.38 \; ({\mbox{stat.}}) \pm 1.25 \; ({\mbox{exp.}}) \pm 0.37 \; (\mbox{extr.}) \; \mbox{mb},$$ 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 $|t|\rightarrow 0$. In addition, the slope of the elastic cross section at small $|t|$ is determined to be $B = 19.73 \pm 0.14 \; ({\mbox{stat.}}) \pm 0.26 \; ({\mbox{syst.}}) \; \mbox{GeV}^{-2}$.

  • Table 1

    Data from Table 7

    10.17182/hepdata.68910.v1/t1

    The measured total cross section, the first systematic error accounts for all experimental uncertainties and the second error for the...

  • Table 2

    Data from Table 8

    10.17182/hepdata.68910.v1/t2

    The nuclear slope of the differential eslastic cross section at small |t|, the first systematic error accounts for all experimental...

  • Table 3

    Data from Table 10

    10.17182/hepdata.68910.v1/t3

    The Optical Point dsigma/(elastic)/dt(t-->0), the total elastic cross section and the observed elastic cross section within the fiducial volume. The...

  • Table 4

    Data from Table 10

    10.17182/hepdata.68910.v1/t4

    The total inelastic cross section, the first systematic error accounts for all experimental uncertainties and the second error for the...

  • Table 5

    Data from Table 6

    10.17182/hepdata.68910.v1/t5

    The measured differential elastic cross section. In addition to the statistical and total systematic uncertainties, the following 24 systematic shifts...

  • Table 6

    Data from Additional material

    10.17182/hepdata.68910.v1/t6

    The statistical covariance matrix for the differential elastic cross section.

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