Abstract
A search for resonancelike structures in the B_{s}^{0}π^{±} invariant mass spectrum is performed using proton-proton collision data collected by the CMS experiment at the LHC at sqrt[s]=8 TeV, corresponding to an integrated luminosity of 19.7 fb^{-1}. The B_{s}^{0} mesons are reconstructed in the decay chain B_{s}^{0}→J/ψϕ, with J/ψ→μ^{+}μ^{-} and ϕ→K^{+}K^{-}. The B_{s}^{0}π^{±} invariant mass distribution shows no statistically significant peaks for different selection requirements on the reconstructed B_{s}^{0} and π^{±} candidates. Upper limits are set on the relative production rates of the X(5568) and B_{s}^{0} states times the branching fraction of the decay X(5568)^{±}→B_{s}^{0}π^{±}. In addition, upper limits are obtained as a function of the mass and the natural width of possible exotic states decaying into B_{s}^{0}π^{±}.
Highlights
The evidence presented by the D0 Collaboration of a new state decaying to B0s㒠[1] initiated considerable interest within the exotic hadron community and triggered a similar search by the LHCb Collaboration [4]
The D0 experiment reported an unexpected, narrow structure, named Xð5568Þ, in the B0sπÆ invariant mass distribution and interpreted it as a hadron composed of four quarks of different flavors
Possible quantum numbers for the state are JP 1⁄4 0þ, if the B0sπÆ is produced in an S-wave, or JP 1⁄4 1þ, if the decay proceeds via the chain Xð5568ÞÆ → BÃs0πÆ, BÃs0 → B0sγ and the photon is not reconstructed
Summary
The evidence presented by the D0 Collaboration of a new state decaying to B0s㒠[1] initiated considerable interest within the exotic hadron community (discussed, e.g., in Refs. [2,3] and references therein) and triggered a similar search by the LHCb Collaboration [4]. B0s signal and higher momenta of the B0s and 㒠candidates are not imposed in this analysis, because such requirements sculpt the B0s㒠invariant mass distribution in a nontrivial way, as discussed in the Supplemental Material [14].
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