Measurement of the exclusive Υ production cross-section in pp collisions at $ \sqrts=7 $ TeV and 8 TeVстатья
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Аннотация: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 7TeV and 8TeV. The measured Υ(1S) and Υ(2S) production cross-sections are
σ(pp→pΥ(1S)p)σ(pp→pΥ(2S)p)==9.0±2.1±1.7 pb and1.3±0.8±0.3 pb,
where the first uncertainties are statistical and the second are systematic. The Υ(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 Υ(3S) production cross-section, including possible contamination from χb(3P)→Υ(3S)γ decays.