Sneutrino Identification in Lepton Pair Production at ILC with Polarized Beams

TL;DR

This paper investigates how to distinguish sneutrino exchange effects from other new physics scenarios in electron-positron collisions at the ILC using polarized beams and specific asymmetries.

Contribution

It proposes a method using double polarization asymmetry to uniquely identify s-channel sneutrino exchange among various new physics models at the ILC.

Findings

Double polarization asymmetry effectively differentiates sneutrino exchange.

Polarized beams are crucial for scenario identification.

Method enhances the sensitivity to sneutrino effects in lepton pair production.

Abstract

Numerous non-standard dynamics are described by contact-like effective interactions that can manifest themselves in electron-positron collisions only through deviations of the observables (cross sections, asymmetries) from the Standard Model predictions. If such a deviation were observed, it would be important to identify the actual source among the possible non-standard interactions as many different new physics scenarios may lead to very similar experimental signatures. We study the possibility of uniquely identifying the indirect effects of s-channel sneutrino exchange, as predicted by supersymmetric theories with R-parity violation, against other new physics scenarios in high-energy e^+e^- annihilation into lepton pairs at the International Linear Collider. These competitive models are interactions based on gravity in large and in TeV-scale extra dimensions, anomalous gauge couplings, Z' vector bosons and compositeness-inspired four-fermion contact interactions. To evaluate the identification reach on sneutrino exchange, we use as basic observable a double polarization asymmetry, that is particularly suitable to directly test for such s-channel sneutrino exchange effects in the data analysis. The availability of both beams being polarized plays a crucial role in identifying the new physics scenario.