Observation of a new Bs π state

<!--HTML--><p>We report the observation of a narrow structure, X(5568), in the decay sequence X(5568) &rarr; B<sub>s</sub> &pi;<sup>&plusmn;</sup>, B<sub>s</sub> &rarr; J/&psi; ϕ, J/&psi; &rarr; &mu;<sup>+</sup&...

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Detalles Bibliográficos
Autor principal: Drutskoy, Alexey
Lenguaje:eng
Publicado: 2016
Materias:
EP Seminar
Acceso en línea:http://cds.cern.ch/record/2147455
Descripción
Sumario:<!--HTML--><p>We report the observation of a narrow structure, X(5568), in the decay sequence X(5568) &rarr; B<sub>s</sub> &pi;<sup>&plusmn;</sup>, B<sub>s</sub> &rarr; J/&psi; ϕ, J/&psi; &rarr; &mu;<sup>+</sup>&mu;<sup>&minus;</sup>, ϕ &rarr; K<sup>+</sup>K<sup>&minus;</sup>. This is the first observation of a hadronic state with valence quarks of four different flavors. The mass and natural width of the new state are measured to be m = 5567.8 &plusmn; 2.9 (stat) +0.9&minus;1.9 (syst) MeV and &Gamma; = 21.9 &plusmn; 6.4 (stat) +5.0&minus;2.5 (syst) MeV, and the significance including look-elsewhere effect and systematic uncertainties is 5.1&sigma;. The observation is based on10.4 fb<sup>&minus;1</sup> of ppbar collision data at 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider.</p>

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