The $\tau$ Magnetic Dipole Moment at Future Lepton Colliders

Howard, J.; Rajaraman, Arvind; Riley, Rebecca; Tait, Tim M. P.

doi:10.31526/lhep.2.2019.113

Cited by 5 publications

(2 citation statements)

References 35 publications

(58 reference statements)

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“…At the detector level, two b-jets are required in the final state to suppress the SM backgrounds. In the simulation, we utilize b-tagging technology [36,37] to distinguish the jet flavor. The b-tagging efficiency is chosen as 70%, the mistagging rate of c-quarks and light flavor quarks is 10% and 1%, respectively.…”

Section: -Associated Productionmentioning

confidence: 99%

Probing magnetic moment operators in production and rare decay *

Cao

Jiang

et al. 2021

Chinese Phys. C

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The magnetic moment ( ) and weak magnetic moment ( ) of charged leptons and quarks are sensitive to quantum effects of new physics heavy resonances. In effective field theory, and are induced by two independent operators. Therefore, one has to measure both and to shed light on new physics. The 's of the SM fermions are measured at the LEP. In this work, we analyze the contributions from magnetic and weak magnetic moment operators in the processes of and at the High-Luminosity Large Hadron Collider. We demonstrate that the two processes can cover most of the parameter space that cannot be probed at the LEP.

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Section: -Associated Productionmentioning

confidence: 99%

Probing magnetic moment operators in production and rare decay *

Cao

Jiang

et al. 2021

Chinese Phys. C

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“…¯. These cuts on the τ leptons ensure that their decay products are collimated, which allows their moments to be reconstructed reasonably accurately, despite the unmeasured energy turning into neutrinos [93]…”

Section: = -( )mentioning

confidence: 99%

Search for the electromagnetic moments of the τ lepton in photon–photon collisions at the LHeC and the FCC-he

Köksal

2019

J. Phys. G: Nucl. Part. Phys.

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We examine the potential of the process ep → eγ * γ * p → eττ p at the Large Hadron Electron Collider (LHeC) and the Future Circular Hadron Electron Collider (FCC-he) to examine nonstandard ττ γ coupling in a model independent way by means of the effective Lagrangian approach.We perform pure leptonic and semileptonic decays for τ − τ + production in the final state. Furthermore, we use L = 10, 50, 100, 300, 500, 1000 fb −1 with at √ s = 1.30, 1.98, 7.07, 10 TeV and we consider systematic uncertainties of δ sys = 0, 5, 10%. The best sensitivity bounds obtained from the process ep → eγ * γ * p → eττ p on the anomalous couplings are −0.0025 <ã τ < 0.0009 and |d τ | < 8.85 × 10 −18 e cm, respectively. Therefore, our results show that the process ep → eγ * γ * p → eττ p at the LHeC and FCC-he are a very good prospect for probing the anomalous magnetic and electric dipole moments of the τ lepton at γ * γ * mode of the future ep collider.

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New physics and tau g−2 using LHC heavy ion collisions

Beresford

Liu

2020

Phys. Rev. D

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The anomalous magnetic moment of the tau lepton aτ = (gτ −2)/2 strikingly evades measurement, but is highly sensitive to new physics such as compositeness or supersymmetry. We propose using ultraperipheral heavy ion collisions at the LHC to probe modified magnetic δaτ and electric dipole moments δdτ . We introduce a suite of one electron/muon plus track(s) analyses, leveraging the exceptionally clean photon fusion γγ → τ τ events to reconstruct both leptonic and hadronic tau decays sensitive to δaτ , δdτ . Assuming 10% systematic uncertainties, the current 2 nb −1 lead-lead dataset could already provide constraints of −0.0080 < aτ < 0.0046 at 68% CL. This surpasses 15 year old lepton collider precision by a factor of three while opening novel avenues to new physics.I.

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The $\tau$ Magnetic Dipole Moment at Future Lepton Colliders

Cited by 5 publications

References 35 publications

Probing magnetic moment operators in production and rare decay *

Probing magnetic moment operators in production and rare decay *

Search for the electromagnetic moments of the τ lepton in photon–photon collisions at the LHeC and the FCC-he

New physics and tau g−2 using LHC heavy ion collisions

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