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The measurement of the forward-backward asymmetry at LHC could be animportant instrument to pinpoint the features of extra neutral gauge particlesobtained by an extension of the gauge symmetry group of the standard model. Fordefinitiveness, in this work we consider an extension of the gauge group of theMinimal 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 ofthe asymmetry obtained implementing four different cuts on the directions andmomenta of the final states of our process of interest. The calculations areperformed without imposing constraints on the charges of the extra Z's of ourmodel, since the anomaly is cancelled by a Green-Schwarz type mechanism. Ourfinal result is a fit of our data with a polynomial in the charges from whichto extract the values of the charges given the experimental result.

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