2026-04-17T07:39:52Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1857912025-12-05T16:41:23Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Badalov, Alexey author Casanova Mohr, Raimon author Garrido Beltrán, Lluís author Gascón Fora, David author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Mann Benito, Carla author Picatoste Olloqui, Eduardo author Rives Molina, Vicente José author Ruiz, Hugo (Ruiz Pérez) author LHCb collaboration author 2022-05-19T14:10:39Z 2022-05-19T14:10:39Z 2015-09-14 2022-05-19T14:10:39Z 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(1S) and Υ(2S) production cross-sections are σ(pp → pΥ(1S)p) = 9.0 ± 2.1 ± 1.7 pb and σ(pp → pΥ(2S)p) = 1.3 ± 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. Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments Measurement of the exclusive Υ production cross-section in pp collisions at √{s}=7 TeV and 8 TeV