New Physics Effects from $e^+e^-\to f\bar f$ at a Linear Collider: the Role of $A_{LR, μ}$

Details New Physics Effects from $e^+e^-\to f\bar f$ at a Linear Collider: the Role of $A_{LR, μ}$ New Physics Effects from $e^+e^-\to f\bar f$ at a Linear Collider: the Role of $A_{LR, μ}$

1999-11-15

arxiv.org/abs/hep-ph/9911359v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, REVTeX, 11 Encapsulated PostScript figures ECFA/DESY Workshop on Linear Collider, Obernai 16-19 October 1999

Scientific paper

We discuss New Physics effects in fermion pair production at LC in the framework of the ``Z-peak subtracted approach'', a theoretical scheme that exploits the experimental measurements at LEP1 and SLC as input parameters. In particular, we discuss the role of the longitudinal polarization asymmetry $A_{LR,\mu}$ which turns out to be a very sensitive probe to New Physics of universal type. The extension of the method to non universal effects is discussed and an application is given in two examples: general contact interactions and low energy gravity models with graviton exchange.

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