CMS-PAS-FSQ-13-006

CMS-PAS-FSQ-13-006
Measurement of the inelastic pPb cross section at 5.02 TeV
CMS Collaboration
2013

Abstract: A measurement of the inelastic proton-lead (pPb) cross section at anucleon-nucleon centre-of-mass energy of .02\, $TeV is presented using the CMS detector at the LHC. Inelastic collisions are tagged using the forward calorimeters at pseudorapidities <\|\eta\|<5$ . Two different event selections are used: (i) a coincidence of both sides of the detector, and (ii) a single-sided event selection. These two selections have different sensitivity to contributions from photon induced ( $\gamma$ p) collisions and hadronic diffractive interactions. The value of the hadronic inelastic cross section is measured within the CMS acceptance and extrapolated to its total value. The photon-induced contribution is subtracted. The final result is $\sigma_{\text{inel}}=2.06\pm0.08\,$ b. The uncertainty is dominated by the luminosity determination. This measurement of the inelastic cross section is consistent with the expectation from the Glauber approach.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; These preliminary results are superseded in this paper, PLB 759 (2016) 641. The superseded preliminary plots can be found here.

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