Sqrt{shat}_{min} resurrected

TL;DR

This paper demonstrates that using reconstructed objects instead of calorimeter data restores the correlation between the variable sqrt{shat}_{min} and the hard scattering scale in SUSY events at the LHC, improving its utility for new physics searches.

Contribution

The study shows that replacing calorimeter inputs with reconstructed objects recovers the correlation of sqrt{shat}_{min} with the hard scale, enhancing its effectiveness in SUSY analyses.

Findings

Reconstructed objects restore the correlation between sqrt{shat}_{min} and the hard scale.

Including W+jets and t tbar+jets backgrounds affects the analysis.

sqrt{shat}_{min} can help suppress SM backgrounds in new physics searches.

Abstract

We discuss the use of the variable sqrt{shat}_{min}, which has been proposed in order to measure the hard scale of a multi parton final state event using inclusive quantities only, on a SUSY data sample for a 14 TeV LHC. In its original version, where this variable was proposed on calorimeter level, the direct correlation to the hard scattering scale does not survive when effects from soft physics are taken into account. We here show that when using reconstructed objects instead of calorimeter energy and momenta as input, we manage to actually recover this correlation for the parameter point considered here. We furthermore discuss the effect of including W + jets and t tbar+jets background in our analysis and the use of sqrt{shat}_{min} for the suppression of SM induced background in new physics searches.