Radiative τ leptonic decays and the possibility to determine the τ dipole moments

Fael, Matteo; D’Ambrosio, G.; Iacovacci, M.; Passera, Massimo; Venanzoni, G.; Massarotti, P.; Mastroianni, S. (26 April 2016). Radiative τ leptonic decays and the possibility to determine the τ dipole moments. EPJ web of conferences, 118, 01012. EDP Sciences 10.1051/epjconf/201611801012

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Precise data on radiative leptonic τ decays offer the opportunity to probe the electromagnetic properties of the τ and may allow to determine its anomalous magnetic moment which, in spite of its precise Standard Model prediction, has never been measured. Recently, the branching fractions of the radiative leptonic τ decays (τ → lν¯νγ, with l = e, μ) were measured by the Babar collaboration. These precise measurements, with a relative error of about 3%, must be compared with the branching ratios at the next-to-leading order in QED. Indeed the radiative corrections are expected to be of order 10%, for l = e, and 3%, for l = μ. Here, we present the prediction of the differential decay rates and branching ratios of the radiative leptonic τ decays in the Standard Model at the next-to-leading order and we compare them with the recent Babar measurements. Moreover, wereport on a dedicated feasibility study for the measurements of the τ anomalous magnetic moment at Belle and Belle II.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Fael, Matteo and Passera, Massimo

Subjects:

500 Science > 530 Physics

ISSN:

2100-014X

Publisher:

EDP Sciences

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

31 Aug 2016 14:56

Last Modified:

08 Feb 2017 16:13

Publisher DOI:

10.1051/epjconf/201611801012

BORIS DOI:

10.7892/boris.86296

URI:

https://boris.unibe.ch/id/eprint/86296

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