English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/15678
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
 |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Tau spin correlations and the anomalous magnetic moment

AutorBernabéu, José ; González Sprinberg, Gabriel A.; Vidal, Jorge
Palabras claveElectromagnetic processes and properties
Standard model
Fecha de publicación22-ene-2009
EditorInstitute of Physics Publishing
CitaciónJHEP01(2009)062
ResumenWe show that the precise determination of the Tau magnetic properties is possible in the next generation accelerators, specially at B/Flavour factories. We define spin correlation observables suitable to extract the real part of the magnetic form factor that, for the first time, will allow to test the standard model-QED predictions. In particular, the predicted QED-dependence with both the momentum transfer and the lepton mass can be precisely measured. Until now, the most stringent bounds on the tau magnetic moment a(tau) come from LEP data with strong assumptions on the physics involved on the observed process. In this paper, we find three different combinations of spin correlations of the outgoing Taus that disentangle the magnetic moment form factor of the Tau lepton in the electromagnetic vertex. These combinations of asymmetries also get rid off the contributions coming from Z-mediating amplitudes to the defined correlations. Using unpolarized electron beams and an integrated luminosity of 15 x 10(18)b(-1), the sensitivity to the tau magnetic moment form factor is of the order 10(-6). This sensitivity is two orders of magnitude better than the present existing high- or low-energy bounds on the magnetic moment and would allow its actual measurement with the precision of a few per cent.
Versión del editorhttp://dx.doi.org/10.1088/1126-6708/2009/01/062
URIhttp://hdl.handle.net/10261/15678
DOI10.1088/1126-6708/2009/01/062
ISSN1126-6708
Aparece en las colecciones: (IFIC) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
vidal.pdf169,74 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.