Asymmetry at LHC for anU(1)′anomalous extension of MSSM

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. 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.

Gaugino radiative decay in an anomalous model

“…This result could be used to discriminate between the two options for a possible decay in LHC. Anyway we will come back to this point in a forthcoming paper where we analyze in details the number of events for the gaugino radiative decay inside LHC [33].…”

“…are the factor C (a) rotated on the Z 0 eigenstate while T µνσρ is given in (33). The pre-factor 1/2 is related to the average over the spin states of the gaugino.…”

“…However this result can be combined with direct [7] and indirect searches [13] of anomalous Z ′ triangle interactions, measurements of the fermionic couplings by Z ′ decay width and forward-backward asymmetries at LHC. We postpone a detailed analysis of these points in a forthcoming paper [33].…”