$\widetilde{\tau}$ searches at the ILC

TL;DR

This paper evaluates the potential of the future ILC collider to perform model-independent searches for the superpartner of the tau lepton, highlighting its advantages over previous LEP and LHC limits.

Contribution

It demonstrates the ILC's capability to set exclusion and discovery limits for $ ilde{ au}$ in a model-independent manner, improving upon prior results.

Findings

ILC can effectively search for $ ilde{ au}$ up to higher masses.

Results show significant improvements over previous collider limits.

The study confirms ILC's potential for SUSY searches in challenging scenarios.

Abstract

The direct pair-production of the superpartner of the $\tau$-lepton, the $\widetilde{\tau}$, is one of the most interesting channels to search for SUSY in. First of all, the $\widetilde{\tau}$ is likely to be the lightest of the scalar leptons. Secondly the signature of $\widetilde{\tau}$ pair production signal events is one of the experimentally most difficult ones, thereby constituting the "worst" possible scenario for SUSY searches. The current model-independent $\widetilde{\tau}$ limits comes from analyses performed at LEP but they suffer from the limited energy of this facility. Limits obtained at the LHC do extend to higher masses, but they are only valid under strong assumptions. ILC, a future electron-positron collider with energy up to 500 GeV and upgrade capability\footnote{The initial ILC energy is planned to be 250 GeV.}, is a promising facility for SUSY searches. The capability of the ILC for determining exclusion/discovery limits for the $\widetilde{\tau}$ in a model-independent way is shown in this paper, together with an overview of the current state-of-the-art. Results of the last studies of $\widetilde{\tau}$ pair-production at the ILC are presented, showing the improvements with respect to previous results.