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Ajaltouni, Z.; Albrecht, J.; Alves, A. A.; Anderlini, L.; Appleby, R. B.; Aslanides, E.; Barlow, R. J.; Blouw, J.; Borghi, S.; Bowen, E.; Bursche, A.; Calvo Gomez, M.; Capriotti, L.; Cardinale, R.; Carvalho Akiba, K.; Cassina, L.; Castillo Garcia, L.; Charles, M.; Ciezarek, G.; Cook, A.; De Cian, M.; De Miranda, J. M.; Deschamps, O.; Di Canto, A.; Dreimanis, K.; Egede, U.; Elsasser, Ch; Evans, H. M.; Firlej, M.; Gandini, P.; Gao, Y.; Gianì, S.; Grabalosa Gándara, M.; Gushchin, E.; Gys, T.; Haen, C.; Hicheur, A.; Hombach, C.; Hussain, N.; Hutchcroft, D.; Hynds, D.; Jacobsson, R.; Jurik, N.; Komarov, I.; Kravchuk, L.; Langhans, B.; Lees, J.-P.; Likhomanenko, T.; Linn, C.; Machefert, F.; Manca, G.; Mapelli, A.; Maratas, J.; Matev, R.; Mathad, A.; Mazurov, A.; McCann, M.; McNulty, R.; Milanes, D. A.; Minard, M.-N.; Muster, B.; Naik, P.; Nakada, T.; Needham, M.; Neuner, M.; O’Hanlon, D. P.; Ogilvy, S.; Pappalardo, L. L.; Patrignani, C.; Perret, P.; Petrolini, A.; Petruzzo, M.; Popov, D.; Prisciandaro, J.; Puig Navarro, A.; Rauschmayr, N.; Reid, M. M.; Rihl, M.; Rives Molina, V.; Saunders, D. M.; Schindler, H.; Schwemmer, R.; Shcheglov, Y.; Shears, T.; Skidmore, N.; Smith, E.; Stevenson, S.; Sutcliffe, W.; Szczekowski, M.; Szumlak, T.; T’Jampens, S.; Tobin, M.; Veltri, M.; Vollhardt, A.; Walsh, J.; Watson, N. K.; Weiden, A.; Wyllie, K.; Yuan, X.; Zhong, L.
The journal of high energy physics, 09/2015, Letnik: 2015, Številka: 9Journal Article
A bstract 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 pp → p Υ 1 S p = 9.0 ± 2.1 ± 1.7 p b and σ pp → p Υ 2 S p = 1.3 ± 0.8 ± 0.3 p b , 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.
