Constrained $\sqrt{\hat{S}_{min}}$ and reconstructing with semi-invisible production at hadron colliders

TL;DR

This paper enhances the mass variable hat{hat{S}_{min}} by incorporating partial event information to better constrain unknown masses and reconstruct semi-invisible events at hadron colliders.

Contribution

It introduces a method to refine the hat{hat{S}_{min}} variable using partial event data for improved mass measurement and event reconstruction in semi-invisible production.

Findings

Enhanced mass constraints for new physics scenarios.

Improved reconstruction of semi-invisible events.

Applicability to Higgs and BSM resonance productions.

Abstract

Mass variable \sqrt{\hat{S}_{min}} and its variants were constructed by minimising the parton level center of mass energy that is consistent with all inclusive measurements. They were proposed to have the ability to measure mass scale of new physics in a fully model independent way. In this work we relax the criteria by assuming the availability of partial informations of new physics events and thus constraining this mass variable even further. Starting with two different classes of production topology, i.e. antler and non-antler, we demonstrate the usefulness of these variables to constrain the unknown masses. This discussion is illustrated with different examples, from the standard model Higgs production and beyond standard model resonance productions leading to semi-invisible production. We also utilise these constrains to reconstruct the semi-invisible events with the momenta of invisible particles and thus improving the measurements to reveal the properties of new physics.