Optimising the search forCP-violation inD+S→K+π+π−decays at LHCb: Using forward-backward asymmetry as a probe for CP-violation

An amplitude analysis of the singly Cabibbo suppressed decay D+s→K+π+π−is performed using the isobar formalism. Using the built model, a sensitivity study forCP-violation was performed. The sensitivity of forward-backward charge asymmetry (A_CP−FB) in the helicity angle iscompared to regional charge asymmetry (A_CP). It was found that in the situations we considered no increase in sensitivity was found by measuring A_CP−FB compared to A_CP