Constraining $\tau$-lepton dipole moments and gluon couplings at the LHC

Abstract

We study the constraints that can be placed on anomalous $\tau$-lepton couplings at the LHC. We use an effective Lagrangian description for physics beyond the standard model which contains the $\tau$-lepton anomalous magnetic moment, electric dipole moment and weak dipole moments in two operators of dimension six. We include in our study two additional operators of dimension eight that directly couple the $\tau$-leptons to gluons and are therefore enhanced at the LHC. We consider the two main effects from these couplings: modifications to the Drell-Yan cross-section and to the $\tau$-lepton pair production in association with a Higgs boson. We find that a measurement of the former at the 14% level can produce constraints comparable to existing ones for the anomalous dipole couplings; and that a bound on the latter at a sensitivity level of $500{\sigma }_{SM}$ or better would produce the best constraint on the $\tau$-gluonic couplings.

15 pages, 9 figures

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Cited by in corpus (13)

• Anomalous electromagnetic moments of $\tau$ lepton in $\gamma \gamma \to {\tau }^{+}{\tau }^{-}$ reaction in Pb+Pb collisions at the LHC
• New physics and tau $g-2$ using LHC heavy ion collisions
• $\tau$ dipole moments via radiative leptonic $\tau$ decays
• A search for high-mass resonances decaying to tau+tau- in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• A search for high-mass resonances decaying to ${\tau }^{+}{\tau }^{-}$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for the anomalous electromagnetic moments of the tau lepton through electron-photon scattering at the CLIC
• $H\to {\tau }^{+}{\tau }^{-}\gamma$ as a Probe of the $\tau$ Magnetic Dipole Moment
• Anomalous magnetic and weak magnetic dipole moments of the $\tau$ lepton in the simplest little Higgs model
• Static weak dipole moments of the $\tau$ lepton via renormalizable scalar leptoquark interactions
• Spin correlations and new physics in $\tau$-lepton decays at the LHC
• Constraining CP-violating electron-gluonic operators
• Strategy to measure tau $g-2$ via photon fusion in LHC proton collisions
• Higgs production constraints on anomalous fermion couplings