Discovery and Identification of Contactlike Interactions in Fermion-pair Production at ILC

TL;DR

This paper investigates how to distinguish between different non-standard contactlike interactions, such as extra-dimensional gravity and four-fermion contact interactions, using fermion-pair production measurements at the ILC.

Contribution

It provides a method to identify the source of deviations from the Standard Model by comparing differential cross sections for various contactlike interaction scenarios.

Findings

Assessment of the identification reach for extra-dimensional gravity versus four-fermion interactions.

Analysis based on differential cross section measurements at the ILC.

Potential to discriminate between different new physics models.

Abstract

Non-standard scenarios described by effective contactlike interactions can be revealed only by searching for deviations of the measured observables from the Standard Model (SM) predictions. If deviations were indeed observed within the experimental uncertainty, the identification of their source among the different non-standard interactions should be needed. We here consider the example of the discrimination of gravity in compactified extra dimensions (ADD model) against the four-fermion contact interactions (CI). We present assessments of the identification reach on this scenario, that could be obtained from measurements of the differential cross sections for the fermionic processes $e^+e^-\to{\bar f}f$, with $f=e,\mu,\tau,c,b$, at the planned ILC.