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 $B_s^0 \rightarrow \mu^\mp D_s^\pm \, \mathrm{X}$, $D_s^\pm \rightarrow \phi \pi^{\pm}$ which is consistent with the previous measurement by the D0 collaboration in the hadronic decay mode, $X^\pm(5568) \to B^0_s \pi^\pm$ where $B^0_s \to J/\psi\phi$. The mass and width of this state are measured using a combined fit of the hadronic and semileptonic data, yielding $m = 5566.9 ^{+3.2}_{-3.1} \thinspace {\rm (stat)} ^{+0.6}_{-1.2} {\rm \thinspace (syst)}$\,MeV/$c^2$, $\Gamma = 18.6 ^{+7.9}_{-6.1} {\rm \thinspace (stat)} ^{+3.5}_{-3.8} {\rm \thinspace (syst)} $\,MeV/$c^2$ with a significance of 6.7$\,\sigma$.
Highlights
Since the creation of the quark model [1,2] it was understood that exotic mesons containing more than one quark-antiquark pair are possible
The 2003 discovery by the Belle experiment [7] of the Xð3872Þ in the channel BÆ → KÆXð→ πþπ−J=ψÞ was the first candidate exotic meson in which heavy flavor quarks participate. This state was subsequently confirmed in several production and decay modes by ATLAS [8], BABAR [9], BES III [10], CDF [11], CMS [12], D0 [13] and LHCb
We present a study of the XÆð5568Þ in the decay to B0sπÆ using semileptonic B0s decays, B0s → μþD−s X, where D−s → φπ−, φ → KþK−, 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
Summary
Since the creation of the quark model [1,2] it was understood that exotic mesons containing more than one quark-antiquark pair are possible. The 2003 discovery by the Belle experiment [7] of the Xð3872Þ in the channel BÆ → KÆXð→ πþπ−J=ψÞ was the first candidate exotic meson in which heavy flavor quarks participate This state was subsequently confirmed in several production and decay modes by ATLAS [8], BABAR [9], BES III [10], CDF [11], CMS [12], D0 [13] and LHCb [14] Collaborations. The D0 Collaboration presented evidence for a new four-quark candidate that decays to B0sπÆ where B0s decays to J=ψφ [15] This system would be composed of two quarks and two antiquarks of four different flavors: b, s, u, d, with either a molecular constitution as a loosely bound B0d as ðbdÞ −. We report here the results of the search for the XÆð5568Þ in the semileptonic channel, as well as a combination of the results in the hadronic and semileptonic channels
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