Measurement of the exclusive ${\rm Y}$ production cross-section in $pp$ collisions at $\sqrt{s}=$7 TeV and 8 TeV

Abstract

A study is presented of central exclusive production of ${\rm Y}(nS)$ states, where the ${\rm Y}(nS)$ resonances decay to the ${\mu }^{+}{\mu }^{-}$ final state, using $pp$ collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range $2<y({\rm Y})<4.5$ where the muons are reconstructed in the pseudorapidity range $2<\eta ({\mu }^{\pm })<4.5$. The data sample corresponds to an integrated luminosity of 2.9 fb${}^{-1}$ and was collected at centre-of-mass energies of $7$ TeV and $8$ TeV. The measured ${\rm Y}(1S)$ and ${\rm Y}(2S)$ production cross-sections are \begin{eqnarray} σ(pp \to pΥ(1S)p) &=& 9.0 \pm 2.1 \pm 1.7\textrm{ pb and}\nonumber\\ σ(pp \to pΥ(2S)p) &=& 1.3 \pm 0.8 \pm 0.3\textrm{ pb},\nonumber \end{eqnarray} where the first uncertainties are statistical and the second are systematic. The ${\rm Y}(1S)$ cross-section is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95\% confidence level for the exclusive ${\rm Y}(3S)$ production cross-section, including possible contamination from ${\chi }_b(3P)\to {\rm Y}(3S)\gamma$ decays.

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References in corpus (1)

• Exclusive ${\rm Y}$ photoproduction in hadronic collisions at CERN LHC energies

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