Search for the charged-lepton-flavor-violating decay $Z\to e\mu$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for the charged-lepton-flavor-violating process $Z\to e\mu$ is presented, using 139 fb${}^{-1}$ of $\sqrt{s}=13$ TeV $pp$ collision data collected by the ATLAS experiment at the LHC. An excess in the $e\mu$ invariant mass spectrum near the $Z$ boson mass would be a striking signature of new physics. No excess is observed, and an upper limit $B(Z\to e\mu )<2.62\times 10^{-7}$ is placed on the branching fraction at 95% confidence level, which is the most stringent limit to date.

33 pages in total, author list starting on page 16, 2 figures, 3 tables, published in Phys. Rev. D (https://link.aps.org/doi/10.1103/PhysRevD.108.032015). All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-35/

References in corpus (11)

• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• NLO vector-boson production matched with shower in POWHEG
• Measurement of the $Z/{\gamma }^{\ast }$ boson transverse momentum distribution in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• Search for the lepton flavor violating decay $Z\to e\mu$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Search for lepton-flavor violating decays of the Higgs boson in the $\mu \tau$ and e$\tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• The ATLAS Inner Detector Trigger performance in pp collisions at 13 TeV during LHC Run 2
• Lepton flavor violating $\mu \to e\gamma$ and $\mu -e$ conversion in unparticle physics
• Search for lepton-flavor-violation in $Z$-boson decays with $\tau$-leptons with the ATLAS detector

Cited by in corpus (7)

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• $CP$ violation in the $HZZ$ vertex and left-right asymmetries
• Lepton Flavor Violation: From Muon Decays to Muon Colliders
• Decays $Z\to e_a{e}_b$ in a 3-3-1 model with neutral leptons
• Search for charged lepton flavor violating Z and Z' boson decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Lepton Flavor Violation of Z Gauge Boson Decays in Supersymmetric Type-III Seesaw Model