First measurement of Upsilon meson production cross sections at sqrt(s)=500 GeV in p+p collisions, including multiplicity dependence.
Systematic study of the experimental measurements on ratios of different $\Upsilon$ states
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abstract
The world data on yields and ratios of different $\Upsilon$ states created in hadron collisions at $\sqrt{s} = 19-8000$ GeV are examined in systematic way. We find that $\Upsilon(2S)/\Upsilon(1S)=0.275\pm0.005$ and $\Upsilon(3S)/\Upsilon(1S)=0.128\pm0.004$. No signficant energy dependence of these ratios are observed within the broad collision energies. In addition, the rapidity, transverse momentum, and transverse mass dependence of these ratios are also reported.
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Measurements of $\varUpsilon$ States Production in $\textit{p+p}$ Collisions at $\sqrt{s} = 500\:\mathrm{GeV}$ with STAR: Cross Sections, Ratios, and Multiplicity Dependence
First measurement of Upsilon meson production cross sections at sqrt(s)=500 GeV in p+p collisions, including multiplicity dependence.