Supersymmetric particle mass measurement with the boost-corrected contransverse mass

TL;DR

This paper introduces a modified contransverse mass technique that corrects for non-zero boosts in the laboratory frame, improving mass measurements of pair-produced particles in collider experiments.

Contribution

A new boost-corrected contransverse mass method is proposed, enhancing mass measurement accuracy for semi-invisible decays in high-energy physics.

Findings

The correction provides a conservative estimate always less than or equal to the true MCT.

Demonstrated effectiveness with leptonic ttbar events.

Applicable to SUSY events with similar final states.

Abstract

A modification to the contransverse mass (MCT) technique for measuring the masses of pair-produced semi-invisibly decaying heavy particles is proposed in which MCT is corrected for non-zero boosts of the centre-of-momentum (CoM) frame of the heavy states in the laboratory transverse plane. Lack of knowledge of the mass of the CoM frame prevents exact correction for this boost, however it is shown that a conservative correction can nevertheless be derived which always generates an MCT value which is less than or equal to the true value of MCT in the CoM frame. The new technique is demonstrated with case studies of mass measurement with fully leptonic ttbar events and with SUSY events possessing a similar final state.