Search for XYZ states in Λ_b decays at the LHCb

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• 作者：Y.K. Hsiao^a ; ^b ; ^c ; C.Q. Geng^a ; ^b ; ^c ; ^{geng@phys.nthu.edu.tw" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 June 2016
• 年：2016
• 卷：757
• 期：Complete
• 页码：47-49
• 全文大小：218 K

文摘

We consider b45ba22ed1f81897764a59eed54ff" title="Click to view the MathML source">X(3872)$X(3872)$ and Y(4140)$Y(4140)$ as the vector tetraquark states of $X_c^0\equiv c\overline{c}u\overline{u}(d\overline{d})$ and $c\overline{c}s\overline{s}$, respectively. By connecting ${\mathrm{\Lambda }}_b\to X_c^0\mathrm{\Lambda }$ to $B^{-}\to X_c^0{K}^{-}$, we predict that the branching ratios of b4e" title="Click to view the MathML source">Λ_b→Λ(X(3872)⁰→)J/ψπ⁺π⁻${\mathrm{\Lambda }}_b\to \mathrm{\Lambda }(X{(3872)}^0\to )J/\psi {\pi }^{+}{\pi }^{-}$ and 3b6f896a8b64c13357de3aeda1" title="Click to view the MathML source">Λ_b→Λ(Y(4140)→)J/ψϕ${\mathrm{\Lambda }}_b\to \mathrm{\Lambda }(Y(4140)\to )J/\psi \varphi$ are b4ba297d21a1cc9568f72494147" title="Click to view the MathML source">(5.2±1.8)×10⁻⁶$(5.2\pm 1.8)\times {10}^{-6}$ and (4.7±2.6)×10⁻⁶$(4.7\pm 2.6)\times {10}^{-6}$, which are accessible to the experiments at the LHCb, respectively. The measurements of these Λ_b${\mathrm{\Lambda }}_b$ modes would be the first experimental evidences for the XYZ states in baryonic decays.