arXiv subjects

M. T. Núñez Pardo de Vera

Publications and source records attributed to M. T. Núñez Pardo de Vera.

3 recordsLinked to original sources

arXiv2022

Stau searches and measurements with the ILD concept at the International Linear Collider

One of the most interesting channels to search for SUSY is the direct pair-production of the $τ$-lepton superpartner, $\widetildeτ$. The $\widetildeτ$ is with high probability the lightest of the scalar leptons, so one of the first SUSY particles that can be observerd, and the signature of $\widetildeτ$ pair production signal events is one of the most difficult ones, yielding to the ``worst'' and so most global scenario for the searches. Analysis performed at LEP set the current model-independent $\widetildeτ$ limits, suffering from the low energy of this facility. Only under strong model assumptions, these limits are extended to higher masses by LHC studies. In this contribution we show the capability of the ILC, a future electron-positron collider with energy up to 1 TeV, for determining $\widetildeτ$ exclusion/discovery limits in a model-independent way, including an overview of the current state-of-the-art. The determination of the ``worst'' scenario for $\widetildeτ$ exclusion/discovery, taking into account the effect of the $\widetildeτ$ mixing on $\widetildeτ$ production cross-section and efficiency, is also presented. For selected benchmarks, the prospect for measuring masses and polarised cross-sections will be shown. The studies were done studying events passed through the full detector simulation and reconstruction procedures of the International Large Detector (ILD) concept at the ILC. The simulation included all SM backgrounds, as well as the machine induced ones.

hep-ph↗

arXiv2022

Evaluating the ILC SUSY reach in the most challenging scenario: $\widetildeτ$ NLSP, low $ΔM$ , lowest cross-section

Pair-production of the superpartner of the $τ$-lepton, the $\tildeτ$, is one of the most interesting channels to search for SUSY in: The $\tildeτ$ is likely to be the lightest scalar lepton, and the signature of $\tildeτ$ pair production is one of the experimentally most difficult ones, thereby constituting the "worst" possible scenario for SUSY searches. The current model-independent $\tildeτ$ 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. The International Linear Collider, the ILC, is a future electron-positron collider, to operate initially at an energy of 250 GeV, then to be upgraded to 500 GeV, and possibly to 1 TeV at a later stage. ILC will be a powerful facility for SUSY searches. The capability of the ILC for determining exclusion/discovery limits for the $\tildeτ$ in a model-independent way is shown in this paper. A detailed study of the "worst" scenario for $\tildeτ$ exclusion/discovery, taking into account the effect of the $\tildeτ$ mixing on $\tildeτ$ production cross-section and detection efficiency, is presented. The study also includes an analysis of the effect of the overlay particles in the $\tildeτ$ searches. The conclusion is that both the exclusion and discovery reaches for this "worst" case would extend to only a few GeV below the kinematic limit at the ILC. Also scenarios with the $\tildeτ$ and the Lightest SUSY Particle (the LSP) quite close in mass can be discovered or excluded at most $\tildeτ$ masses. The studies were done using detailed detector simulation of the ILD concept at the ILC. For signal, the fast detector simulation SGV was used, while the full Geant4 based DDSim was used for the standard model backgrounds.

hep-ph↗

arXiv2021

$\widetildeτ$ searches at the ILC

The direct pair-production of the superpartner of the $τ$-lepton, the $\widetildeτ$, is one of the most interesting channels to search for SUSY in. First of all, the $\widetildeτ$ is likely to be the lightest of the scalar leptons. Secondly the signature of $\widetildeτ$ 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 $\widetildeτ$ 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 $\widetildeτ$ 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 $\widetildeτ$ pair-production at the ILC are presented, showing the improvements with respect to previous results.

hep-ph↗