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

The collaboration
JHEP 1509 (2015) 084, 2015

Abstract (data abstract)
CERN-LHCb. A study is presented of central exclusive production of $\Upsilon(nS)$ states, where the $\Upsilon(nS)$ 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 $2 < y(\Upsilon) < 4.5$ 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 $\Upsilon(1S)$ and $\Upsilon(2S)$ production cross-sections are $\sigma(pp \to p\Upsilon(1S)p) = 9.0 \pm 2.1 \pm 1.7 \text{ pb}$ and $\sigma(pp \to p\Upsilon(2S)p) = 1.3 \pm 0.8 \pm 0.3 \text{ pb},$ where the first uncertainties are statistical and the second are systematic. The $\Upsilon(1S)$ 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 $\Upsilon(3S)$ production cross-section, including possible contamination from $\chi_b(3P) \to \Upsilon(3S)\gamma$ decays.

• #### Table 1

Data from Table 4

10.17182/hepdata.72986.v1/t1

Production cross-section for the $\Upsilon(1S)$ resonance in ranges of $\Upsilon(1S)$ rapidity, where the muons are required to lie in the...

• #### Table 2

Data from Table 5

10.17182/hepdata.72986.v1/t2

Differential production cross-section for $\Upsilon(1S)$, where the data have been corrected for the effect of the LHCb geometrical acceptance. The...