The tau weak-magnetic dipole moment

Bernabéu, J.; González-Sprinberg, Gabriel A.; Tung, Michael M.; Vidal, J. Ruiz

doi:10.1016/0550-3213(94)00525-j

Cited by 52 publications

(66 citation statements)

References 22 publications

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“…Re µ τ , Im µ τ , Re d τ and Im d τ . Radiative corrections in the SM provide nonzero predictions for µ τ and d τ [1,2] which are below the present experimental sensitivity. This opens the possibility to look for deviations from the SM.…”

Section: Introductionmentioning

confidence: 99%

Search for anomalous weak dipole moments of the $\tau$ lepton

Heister¹,

Schael²,

Barate³

et al. 2003

Eur. Phys. J. C

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The anomalous weak dipole moments of the τ lepton are measured in a data sample collected by ALEPH from 1990 to 1995 corresponding to an integrated luminosity of 155 pb −1 . Tau leptons produced in the reaction e + e − → τ + τ − at energies close to the Z mass are studied using their semileptonic decays to π, ρ, a 1 → π2π 0 or a 1 → 3π. The real and imaginary components of both the anomalous weak magnetic dipole moment and the CP-violating anomalous weak electric dipole moment, Re µ τ , Im µ τ , Re d τ and Im d τ , are measured simultaneously by means of a likelihood fit built from the full differential cross section. No evidence of new physics is found. The following bounds are obtained (95% CL): |Re µ τ | < 1.14 ×10 −3 , |Im µ τ | < 2.65 ×10 −3 , |Re d τ | < 0.91 ×10 −3 , and |Im d τ | < 2.01 × 10 −3 .

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Section: Introductionmentioning

confidence: 99%

Search for anomalous weak dipole moments of the $\tau$ lepton

Heister¹,

Schael²,

Barate³

et al. 2003

Eur. Phys. J. C

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“…2. As we said before, a Z τ | EW is given in [7] and a detailed computation of a Z τ | 2HD can be found in [8]. We will not repeat these results here, but we want to stress that we have checked the analytical formulae and the numerical results presented in [8].…”

Section: The τ Leptonmentioning

confidence: 92%

“…and was calculated by Bernabéu et al [7]. They showed that a Z τ in the SM is dominated by W − ν diagrams.…”

Section: The τ Leptonmentioning

confidence: 99%

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Weak magnetic dipole moments in the MSSM

Carlos

Moreno

1998

Nuclear Physics B

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We calculate the weak magnetic dipole moment of different fermions in the MSSM. In particular, we consider in detail the predictions for the WMDM of the τ lepton and bottom quark. We compare the purely SUSY contributions with two Higss doublet models and SM predictions.For the τ lepton, we show that chargino diagrams give the main SUSY contribution, which for tan β = 50 can be one order of magnitude bigger than the SM prediction. For the b quark, gluino diagrams provide the main SUSY contribution to its weak anomalous dipole moment, which is still dominated by gluon contributions. We also study how the universality assumption in the slepton sector induces correlations between the SUSY contributions to the τ WMDM and to (g − 2) of the muon.

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“…Following the notation of references [11] and [14], we now show how to measure the EDM using low energy CP -odd observables. At low energies and in the hypothesis stated above, the EDM gives contributions to leading order in the Normal-Transverse and Normal-Longitudinal correlation terms of the…”

Section: Low Energy Observablesmentioning

confidence: 99%

CP violation and electric dipole moment at low energy τ-pair production

Bernabéu

González-Sprinberg

2004

Nuclear Physics B

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CP violation at low energy is investigated at the τ electromagnetic vertex. High statistics at B factories, and on top of the Υ resonances, allows a detailed investigation of CP -odd observables related to the τ -pair production. The contribution of the tau electric dipole moment is considered in detail. We perform an analysis independent from the high energy data by means of correlation and linear spin observables at low energy. We show that different CP -odd asymmetries, associated to the normal-transverse and normal-longitudinal correlation terms can be measured at low energy accelerators, both at resonant and non resonant energies. These observables allow to put stringent and independent bounds to the tau electric dipole moment that are competitive with other high or low energy results.

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The tau weak-magnetic dipole moment

Cited by 52 publications

References 22 publications

Search for anomalous weak dipole moments of the $\tau$ lepton

Search for anomalous weak dipole moments of the $\tau$ lepton

Weak magnetic dipole moments in the MSSM

CP violation and electric dipole moment at low energy τ-pair production

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