Search for a Structure in the B0sπ± Invariant Mass Spectrum with the ATLAS Experiment Aguilar Saavedra, Juan Antonio Atlas Collaboration Colliding beams ATLAS CERN LHC Coll Mass spectrum: (B/s0 pi+) A search for the narrow structure, X(5568), reported by the D0 Collaboration in the decay sequence X→Bs0π±, Bs0→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 D0, and on the X production rate relative to Bs0 mesons, ρX, were determined at 95% confidence level. The results are N(X)<382 and ρX<0.015 for Bs0 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 Bs0π± resonances in the mass range 5550 to 5700 MeV. 2019-06-23T23:55:11Z 2019-06-23T23:55:11Z 2018 info:eu-repo/semantics/article Aguilar-Saavedra, J.A [et al.]. Search for a Structure in the B0sπ± Invariant Mass Spectrum with the ATLAS Experiment. PHYSICAL REVIEW LETTERS 120, 202007 (2018). [http://hdl.handle.net/10481/56081] 0031-9007 http://hdl.handle.net/10481/56081 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España American Physical Society