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First Observation of Top Quark Production in the Forward Region Badalov, Alexey Calvo Gómez, Míriam Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Particle physics Experiments Top quark production in the forward region in proton-proton collisions is observed for the first time. The W + b final state with W → μ ν is reconstructed using muons with a transverse momentum, p T , larger than 25 GeV in the pseudorapidity range 2.0 < η < 4.5 . The b jets are required to have 50 < p T < 100     GeV and 2.2 < η < 4.2 , while the transverse component of the sum of the muon and b -jet momenta must satisfy p T > 20     GeV . The results are based on data corresponding to integrated luminosities of 1.0 and 2.0     fb − 1 collected at center-of-mass energies of 7 and 8 TeV by LHCb. The inclusive top quark production cross sections in the fiducial region are σ ( top ) [ 7     TeV ] = 239 ± 53 ( stat ) ± 33 ( syst ) ± 24 ( theory )     fb , σ ( top ) [ 8     TeV ] = 289 ± 43 ( stat ) ± 40 ( syst ) ± 29 ( theory )     fb . These results, along with the observed differential yields and charge asymmetries, are in agreement with next-to-leading order standard model predictions. 2019-05-09T09:24:51Z 2019-05-09T09:24:51Z 2015-09-08 2019-05-09T09:24:51Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/132909 656770 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.115.112001 Physical Review Letters, 2015, vol. 115, num. 11, p. 112001 https://doi.org/10.1103/PhysRevLett.115.112001 cc by (c) CERN; LHCb Collaboration, 2015 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 10 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)