Search for a Structure in the B0sπ± Invariant Mass Spectrum with the ATLAS Experiment
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American Physical Society
Colliding beamsATLASCERN LHC CollMass spectrum: (B/s0 pi+)
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]
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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.