Search for the Z boson decay to $\tau \tau \mu \mu$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

The first search for the Z boson decay to $\tau \tau \mu \mu$ at the CERN LHC is presented, based on data collected by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb${}^{-1}$. The data are compatible with the predicted background. For the first time, an upper limit at the 95% confidence level of 6.9 times the standard model expectation is placed on the ratio of the Z $\to$ $\tau \tau \mu \mu$ to Z $\to$ 4$\mu$ branching fractions. Limits are also placed on the six flavor-conserving four-lepton effective-field-theory operators involving two muons and two tau leptons, for the first time testing all such operators.

arXiv commentReplaced 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/SMP-22-016 (CMS Public Pages)

References in corpus (46)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Dimension-Six Terms in the Standard Model Lagrangian
• Confidence Level Computation for Combining Searches with Small Statistics
• Parton distributions from high-precision collider data
• PDF4LHC recommendations for LHC Run II
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• The Standard Model as an Effective Field Theory
• Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG
• Dressing L_mu - L_tau in Color
• Spin determination of single-produced resonances at hadron colliders
• Performance of the CMS Level-1 trigger in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precision luminosity measurement in proton-proton collisions at $\sqrt{s}=$ 13 TeV in 2015 and 2016 at CMS
• W+W-, WZ and ZZ production in the POWHEG BOX
• On the spin and parity of a single-produced resonance at the LHC
• Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
• Higgs production via gluon fusion in the POWHEG approach in the SM and in the MSSM
• Performance of missing transverse momentum reconstruction in proton-proton collisions at $\sqrt{s}=$ 13 TeV using the CMS detector
• The SMEFTsim package, theory and tools
• Muon Anomalous $g-2$ and Gauged $L_{\mu }-L_{\tau }$ Models
• W+W-, WZ and ZZ production in the POWHEG BOX V2
• Performance of reconstruction and identification of $\tau$ leptons decaying to hadrons and ${\nu }_{\tau }$ in pp collisions at $\sqrt{s}=$ 13 TeV
• Constraining anomalous HVV interactions at proton and lepton colliders
• SMEFTsim 3.0 -- a practical guide
• The Standard Model effective field theory at work
• A $L_{\mu }-L_{\tau }$ theory of Higgs flavor violation and $(g-2{)}_{\mu }$
• Muon g-2 and LHC phenomenology in the $L_{\mu }-L_{\tau }$ gauge symmetric model
• Model independent constraints on four-lepton operators
• Leptophilic Dark Matter with $Z^{\prime }$ interactions
• Observation of Z decays to four leptons with the CMS detector at the LHC
• Global Analysis of Leptophilic Z' Bosons
• Constraints on $L_{\mu }-L_{\tau }$ interactions at the LHC and beyond
• Using the (Modified) Matrix Element Method to constrain $L_{\mu }-L_{\tau }$ Interactions
• Four-lepton Z-boson decay constraints on the SMEFT
• Observation of the Z $\to \psi {\ell }^{+}{\ell }^{-}$ decay in pp collisions at $\sqrt{s}=$ 13 TeV
• Detecting a μτ-philic Z' boson via photon initiated processes at the LHC