Controlling ISR in sparticle mass reconstruction

TL;DR

This paper introduces new variables MT2(min) and MT2mod(min) that improve sparticle mass reconstruction by reducing initial state radiation effects, enabling accurate determination of squark and gluino masses in CMSSM.

Contribution

The paper proposes novel MT2-based parameters that enhance mass measurement accuracy and compares their effectiveness with existing MTGen distributions.

Findings

MT2(min) and MT2mod(min) endpoints are less affected by initial state radiation.

Both squark and gluino masses can be accurately extracted from these endpoints.

Comparison shows improved performance over traditional MTGen distributions.

Abstract

Use of inclusive MT2 distribution for sparticle mass determination is discussed. We define new parameters MT2(min) and MT2mod(min), which are a kind of minimum of sub-systerm MT2 values. Their endpoints are less affected by initial state radiations. We demonstrate that both masses of squark and gluino can be extracted from the endpoints of the distributions in the wide region of parameter space expected in CMSSM. We also present a comparison with MTGen distributions.