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CMS_2018_I1653948

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A measurement of the inelastic proton-proton cross section at $\sqrt{s} = 13$ TeV with the CMS detector at the LHC has been presented. An inelastic cross section of $67.5 \pm 0.8 \text{(syst)} \pm 1.6 \text{(lumi)}$ mb is obtained for $\xi = M^2/s > 10^{-6}$ (corresponding to $M > 13$ GeV), with $M$ the larger of $M_{\mathrm{X}}$ and $M_{\mathrm{Y}}$, where $M_{\mathrm{X}}$ and $M_{\mathrm{Y}}$ are the masses of the diffractive dissociation systems with negative and positive pseudorapidities, respectively. In addition, an inelastic cross section of $68.6 \pm 0.5 \text{(syst)} \pm 1.6 \text{(lumi)}$ mb is obtained in the enlarged phase space $\xi_{\mathrm{X}} > 10^{-7}$ and/or $\xi_{\mathrm{Y}} > 10^{-6}$ (corresponding to $M_{\mathrm{X}} > 4.1$ GeV and/or $M_{\mathrm{Y}} > 13$ GeV).

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