A search for resonancelike structures in the B_s^0π^± 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^0π^± 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^0π^±. In addition, upper limits are obtained as a function of the mass and the natural width of possible exotic states decaying into B_s^0π^±.
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). Search for the X(5568) State Decaying into B_s^0π^± in Proton-Proton Collisions at sqrt[s]=8 TeV. PHYSICAL REVIEW LETTERS, 120(20), 202005-1-202005-17 [10.1103/PhysRevLett.120.202005].
Search for the X(5568) State Decaying into B_s^0π^± in Proton-Proton Collisions at sqrt[s]=8 TeV
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2018
Abstract
A search for resonancelike structures in the B_s^0π^± 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^0π^± 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^0π^±. In addition, upper limits are obtained as a function of the mass and the natural width of possible exotic states decaying into B_s^0π^±.
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Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione.
