Measurement of the $\mathrm{Z}{\gamma }^{\ast }\to \tau \tau$ cross section in pp collisions at $\sqrt{s}=$ 13 TeV and validation of $\tau$ lepton analysis techniques

Abstract

A measurement is presented of the $\mathrm{Z}/{\gamma }^{\ast }\to \tau \tau$ cross section in pp collisions at $\sqrt{s}=$ 13 TeV, using data recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 2.3 fb${}^{-1}$. The product of the inclusive cross section and branching fraction is measured to be $\sigma (\mathrm{pp}\to \mathrm{Z}/{\gamma }^{\ast }\text{+X})\mathcal{B}(\mathrm{Z}/{\gamma }^{\ast }\to \tau \tau )=$ 1848 $\pm$ 12 (stat) $\pm$ 67 (syst+lumi) pb, in agreement with the standard model expectation, computed at next-to-next-to-leading order accuracy in perturbative quantum chromodynamics. The measurement is used to validate new analysis techniques relevant for future measurements of $\tau$ lepton production. The measurement also provides the reconstruction efficiency and energy scale for $\tau$ decays to hadrons+${\nu }_{\tau }$ final states, determined with respective relative uncertainties of 2.2% and 0.9%.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-15-007/ (CMS Public Pages)

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