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Aiola, S.; Albrecht, J.; Alexander, M.; Bachmann, S.; Balagura, V.; Bay, A.; Bediaga, I.; Belin, S.; Ben-Haim, E.; Bernstein, H. C.; Bertella, C.; Bozzi, C.; Bradley, M. J.; Braun, S.; Camargo Magalhaes, P.; Carniti, P.; Cerasoli, J.; Chefdeville, M.; Chernov, A.; De Capua, S.; De Cian, M.; De Miranda, J. M.; De Serio, M.; de Vries, J. A.; Dobishuk, V.; Dordei, F.; Eklund, L.; Farry, S.; Ferreira Rodrigues, F.; Fiutowski, T.; Galli, D.; Gandini, P.; Garra Tico, J.; Gligorov, V. V.; Gorbounov, P.; Graciani Diaz, R.; Grammatico, T.; Greim, R.; Gys, T.; Haen, C.; Heijhoff, K.; Heinicke, K.; Heister, A.; Hynds, D.; Ibis, P.; Kenzie, M.; Kim, K. E.; Kirsebom, V. S.; Kucharczyk, M.; Kuindersma, H. S.; Maddrell-Mander, S.; Marshall, P. J.; Martinazzoli, L.; Martinez Vidal, F.; Mathe, Z.; Meadows, B.; Merk, M.; Moise, R. D.; Morris, A. B.; Mu, H.; Mulder, M.; Müller, K.; Muzzetto, P.; Neufeld, N.; Pais, P. R.; Parker, W.; Patel, M.; Pearce, A.; Pereima, D.; Petrolini, A.; Polycarpo, E.; Ponce, S.; Reiss, F.; Renaudin, V.; Rodrigues, E.; Romero Vidal, A.; Saitta, B.; Santimaria, M.; Saur, M.; Schune, M. H.; Shchutska, L.; Shekhtman, L.; Stramaglia, M. E.; Sun, J.; Swientek, K.; Tobin, M.; Tou, D. Y.; Tsaregorodtsev, A.; Ukleja, A.; Usachov, A.; Ustyuzhanin, A.; Valassi, A.; Vazquez Regueiro, P.; Wiedner, D.; Wilkinson, G.; Witola, L.; Wu, H.; Xiao, D.; Yu, J.; Zdybal, M.
Physical review letters, 02/2020, Letnik: 124, Številka: 8Journal Article
We report four narrow peaks in the Ξb0K− mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb−1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are mΩb(6316)−=6315.64±0.31±0.07±0.50 MeV, mΩb(6330)−=6330.30±0.28±0.07±0.50 MeV, mΩb(6340)−=6339.71±0.26±0.05±0.50 MeV, mΩb(6350)−=6349.88±0.35±0.05±0.50 MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξb0 mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be ΓΩb(6316)−<2.8 MeV, ΓΩb(6330)−<3.1 MeV and ΓΩb(6340)−<1.5 MeV. The natural width of the Ωb(6350)− peak is 1.4−0.8+1.0±0.1 MeV, which is 2.5σ from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6σ to 7.2σ. After accounting for the look-elsewhere effect, the significances of the Ωb(6316)− and Ωb(6330)− peaks are reduced to 2.1σ and 2.6σ, respectively, while the two higher mass peaks exceed 5σ. The observed peaks are consistent with expectations for excited Ωb− resonances.
