Asymmetry at LHC for an U(1)' anomalous extension of MSSM

TL;DR

This paper investigates how the forward-backward asymmetry at LHC can reveal features of an extended gauge symmetry involving an anomalous U(1) in the MSSM, providing a method to determine extra Z' charges.

Contribution

It introduces a novel approach to analyze asymmetries at LHC for an anomalous U(1) extension of MSSM without charge constraints, using polynomial fits to extract charge values.

Findings

Developed four asymmetry definitions with different cuts.

Performed calculations without charge constraints due to Green-Schwarz anomaly cancellation.

Provided a polynomial fit method to extract U(1)' charges from experimental data.

Abstract

The measurement of the forward-backward asymmetry at LHC could be an important instrument to pinpoint the features of extra neutral gauge particles obtained by an extension of the gauge symmetry group of the standard model. For definitiveness, in this work we consider an extension of the gauge group of the Minimal Supersymmetric Standard Model by an extra anomalous U(1) gauge symmetry (MiAUMSSM). We focus on pp -> e+e- at LHC and use four different definitions of the asymmetry obtained implementing four different cuts on the directions and momenta of the final states of our process of interest. The calculations are performed without imposing constraints on the charges of the extra Z's of our model, since the anomaly is cancelled by a Green-Schwarz type mechanism. Our final result is a fit of our data with a polynomial in the charges from which to extract the values of the charges given the experimental result.