Study of the $X^{\pm }(5568)$ state with semileptonic decays of the $B_s^0$ meson

Abstract

We present a study of the $X^{\pm }(5568)$ using semileptonic decays of the $B_s^0$ meson using the full Run II integrated luminosity of 10.4 fb${}^{-1}$ in proton-antiproton collisions at a center of mass energy of 1.96\,TeV collected with the D0 detector at the Fermilab Tevatron Collider. We report evidence for a narrow structure, $X^{\pm }(5568)$, in the decay sequence $X^{\pm }(5568)\to B_s^0{\pi }^{\pm }$ where $B_s^0\to {\mu }^{\mp }{D}_s^{\pm }\mathrm{X}$, $D_s^{\pm }\to \varphi {\pi }^{\pm }$ which is consistent with the previous measurement by the D0 collaboration in the hadronic decay mode, $X^{\pm }(5568)\to B_s^0{\pi }^{\pm }$ where $B_s^0\to J/\psi \varphi$. The mass and width of this state are measured using a combined fit of the hadronic and semileptonic data, yielding $m=5566.9_{-3.1}^{+3.2}{(\mathrm{stat})}_{-1.2}^{+0.6}(\mathrm{syst})$\,MeV/$c^2$, $\Gamma =18.6_{-6.1}^{+7.9}{(\mathrm{stat})}_{-3.8}^{+3.5}(\mathrm{syst})$\,MeV/$c^2$ with a significance of 6.7$\sigma$.

19 pages, 12 figures, updated to version acepted by {hys. Rev. Lett

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