Hadroproduction of ${\rm Y}(nS)$ above $B\bar{B}$ Thresholds and Implications for $Y_b(10890)$

Abstract

Based on the non-relativistic QCD factorization scheme, we study the hadroproduction of the bottomonium states ${\rm Y}(5S)$ and ${\rm Y}(6S)$. We argue to search for them in the final states ${\rm Y}(1S,2S,3S){\pi }^{+}{\pi }^{-}$, which are found to have anomalously large production rates at ${\rm Y}(5S)$. The enhanced rates for the dipionic transitions in the ${\rm Y}(5S)$-energy region could, besides ${\rm Y}(5S)$, be ascribed to $Y_b(10890)$, a state reported by the Belle collaboration, which may be interpreted as a tetraquark. The LHC/Tevatron measurements are capable of making a case in favor of or against the existence of $Y_b(10890)$, as demonstrated here. Dalitz analysis of the ${\rm Y}(1S,2S,3S){\pi }^{+}{\pi }^{-}$ states from the ${\rm Y}(5S)/Y_b(10890)$ decays also impacts directly on the interpretation of the charged bottomonium-like states, $Z_b(10600)$ and $Z_b(10650)$, discovered by Belle in these puzzling decays.

6 pages, 2 figures; v2: new estimates of color-octet contributions, and comparison with the recent CMS data

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Cited by in corpus (11)

• The hidden-charm pentaquark and tetraquark states
• Bottomonium Mesons and Strategies for Their Observation
• Open-charm tetraquark $X_c$ and open-bottom tetraquark $X_b$
• Production of the bottom analogues and the spin partner of the X(3872) at hadron colliders
• Production of charged heavy quarkonium-like states at the LHC and the Tevatron
• Interpretation of $Y_b(10750)$ as a tetraquark and its production mechanism
• Hunting for the $X_b$ via hidden bottomonium decays
• Possible hadronic molecular states composed of $S$-wave heavy-light mesons
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• Hunting for $X_b$ via hidden bottomonium decays $X_b\to \pi \pi {\chi }_{bJ}$
• Possible Molecular Explanation for the Resonance $Y(4500)$