Measurement of the exclusive Υ production cross-section in pp collisions at √{s}=7 TeV and 8 TeV
Abstract
A study is presented of central exclusive production of Υ( nS) states, where the Υ( nS) resonances decay to the μ + μ - final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4 .5 where the muons are reconstructed in the pseudorapidity range 2 < η( μ ±) < 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 Υ(1 S) and Υ(2 S) production cross-sections are σ ( ppto pY(1S)p)=9.0± 2.1± 1.7 pb and σ ( ppto pY(2S)p)=1.3± 0.8± 0.3 pb, where the first uncertainties are statistical and the second are systematic. The Υ(1 S) crosssection 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 Υ(3 S) production cross-section, including possible contamination from χ b (3 P ) → Υ(3 S)γ decays. [Figure not available: see fulltext.]
- Publication:
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Journal of High Energy Physics
- Pub Date:
- September 2015
- DOI:
- 10.1007/JHEP09(2015)084
- arXiv:
- arXiv:1505.08139
- Bibcode:
- 2015JHEP...09..084A
- Keywords:
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- Diffraction;
- Hadron-Hadron Scattering;
- Forward physics;
- Particle and resonance production;
- Heavy quark production;
- High Energy Physics - Experiment
- E-Print:
- Minor revisions to match published journal version