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

The LHCb 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


    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


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

Loading Data...