Measurements of Masses in SUGRA Models at LHC

TL;DR

This paper demonstrates a method to measure supersymmetric particle masses at the LHC in a model-independent way using decay distributions, and discusses testing slepton universality and parameter space constraints.

Contribution

It introduces a new measurement technique for SUSY particle masses using decay distributions that does not depend on a specific model.

Findings

Masses of supersymmetric particles can be determined without relying on a model.

Feasibility of testing slepton universality at ~0.1% level at high luminosity.

Constraints on the minimal SUGRA parameter space from slepton production and decay distributions.

Abstract

This paper presents new measurements in a case study of the minimal SUGRA model with m_0=100 GeV, mhalf=300 GeV, A_0=0, tan(beta)=2.1, and mu=+1 based on four-body distributions from three-step decays and on minimum masses in such decays. These measurements allow masses of supersymmetric particles to be determined without relying on a model. The feasibility of testing slepton universality at the ~0.1% level at high luminosity is discussed. In addition, the effect of enlarging the parameter space of the minimal SUGRA model is discussed. The direct production of left handed sleptons and the non-observation of additional structure in the dilepton invariant mass distributions is shown to provide additional constraints.