LIMITS ON THE DIPOLE MOMENTS OF THE τ-LEPTON VIA THE PROCESS e⁺e^-→τ⁺τ^-γ IN A LEFT–RIGHT SYMMETRIC MODEL

Abstract

Limits on the anomalous magnetic moment and the electric dipole moment of the τ lepton are calculated through the reaction e + e − → τ + τ − γ at the Z 1 -pole and in the framework of a left-right symmetric model. The results are based on the recent data reported by the L3 Collaboration at CERN LEP.Due to the stringent limit of the model mixing angle φ, the effect of this angle on the dipole moments is quite small.

LIMITS ON THE ELECTROMAGNETIC AND WEAK DIPOLE MOMENTS OF THE TAU-LEPTON IN E6 SUPERSTRING MODELS

“…2 of the Ref. [53]. Our results for the dependence of the differential cross section on the photon energy versus the cosine of the opening angle between the photon and the beam direction (θ γ ) are presented in Fig.…”

“…In a previous paper [53] we estimated bounds on the anomalous magnetic moment and the electric dipole moment of the tau through the process e + e − → τ + τ − γ in the context of a LRSM at the Z 1 pole. We found that these bound were almost independent of the mixing angle φ of the model.…”

Model-independent sensitivity estimates for the electromagnetic dipole moments of the τ -lepton at the CLIC

“…Furthermore, there has been extensive theoretical work done in BSM models that contributes to dipole moments of charged leptons: CP-violation BSM [14], extra dimensions [15], seesaw model [16], version III of the two-higgs-doublet model [17], noncommutative geometry [18], nonuniversal extra dimensions [19], left-right symmetric model [20], E 6 superstring models [21], simplest little Higgs model [22], and 331 model [23]. There are also bounds independent of the model such as γp collisions [24], e − γ scattering [25], and γγ collisions [26,27].…”

Analysis of the anomalous electromagnetic moments of the tau lepton in γp collisions at the LHC

“…Since CP violating dipole moment highly suppressed in the SM (induces with three loop level [9]), any measurement at colliders of the electric dipole moment of the tau lepton gives hints about the new physics beyond the SM. The CP violation may come from new physics theories in lepton sector such as leptoquark [10,11], SUSY [12], left-right symmetric [13,14] and Higgs models [15][16][17][18].…”