CMS-PAS-SMP-22-016

CMS-PAS-SMP-22-016
Search for the Z boson decay to $\tau^+\tau^-\mu^+\mu^-$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
CMS Collaboration
25 March 2023

Abstract: The first search for the Z boson decay to $\tau^+\tau^-\mu^+\mu^-$ is presented. The data analyzed were collected by the CMS experiment at the CERN LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 138 fb $^{-1}$ . Targeting tau lepton decays to muons and neutrinos, events with two pairs of oppositely charged muons are analyzed. The data are found to be compatible with the predicted background. A 95% confidence level upper limit of 6.2 is placed on the ratio of the ${\mathrm{Z}\to\tau^+\tau^-\mu^+\mu^-}$ to ${\mathrm{Z}\to\mu^+\mu^-\mu^+\mu^-}$ branching fractions, excluding values above 6.9 times the standard model expectation.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here.

CMS Publications