Search for a Structure in the B{{_s}{^0}} Π^± Invariant Mass Spectrum with the ATLAS Experiment

A search for the narrow structure, X(5568), reported by the DO Collaboration in the decay sequence X → B{{_s}{^0}} π^±, B{{_s}{^0}} → J/ψφ, is presented. The analysis is based on a data sample recorded with the ATLAS detector at the LHC corresponding to 4.9 fb⁻¹ of pp collisions at 7 TeV and 19.5 fb⁻¹ at 8 TeV. No significant signal was found. Upper limits on the number of signal events, with properties corresponding to those reported by DO, and on the A production rate relative to B{{_s}{^0}} mesons, ρx, were determined at 95% confidence level. The results are N(X) < 382 and ρx < 0.015 for B{{_s}{^0}} mesons with transverse momenta above 10 GeV and N(X) < 356 and ρx < 0.016 for transverse momenta above 15 GeV. Limits are also set for potential B{{_s}{^0}} π^± resonances in the mass range 5550 to 5700 MeV.