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Ali, S; Alves, A A; Barsuk, S; Bien, A; Brook, N H; Calvo Gomez, M; Carniti, P; Carvalho Akiba, K; Castillo Garcia, L; Charpentier, Ph; Chen, S; Cogneras, E; Corti, G; Craik, D C; Crocombe, A; Cruz Torres, M; Currie, R; De Capua, S; De Miranda, J M; Del Buono, L; Di Ruscio, F; Donleavy, S; Esen, S; Farinelli, C; Farry, S; Ferreira Rodrigues, F; Fol, P; Frosini, M; Fu, J; Gandelman, M; Haines, S C; He, J; Jalocha, J; Jing, F; John, M; Kanso, W; Karodia, S; Klimaszewski, K; Kolpin, M; Koopman, R F; Kurek, K; Lafferty, G; Latham, T; Le Gac, R; van Leerdam, J; Leverington, B; Lindner, R; Linn, C; Longstaff, I; Lucio Martinez, M; Luo, H; Luppi, E; Mancinelli, G; Marchand, J F; Marconi, U; Marks, J; Martin, M; Matteuzzi, C; Mazurov, A; Meissner, M; Morandin, M; Muheim, F; Nandi, A; Novoselov, A; Oblakowska-Mucha, A; Ogilvy, S; Okhrimenko, O; Palutan, M; Papanestis, A; Pinci, D; Qian, W; Quagliani, R; Richards, S; Rinnert, K; Romanovsky, V; Romero Vidal, A; Salustino Guimaraes, V; Savrina, D; Schlupp, M; Schmelling, M; Schune, M-H; Semennikov, A; Sepp, I; Serrano, J; Snoek, H; Sridharan, S; Sterpka, F; Swientek, S; Thomas, E; Tran, M T; Trisovic, A; Vázquez Sierra, C; Vieira, D; Volyanskyy, D; Vorobyev, V; Wotton, S A; Xu, Z; Yushchenko, O; Zhelezov, A; Zhokhov, A
Physical review letters, 2015-Sep-11, Letnik: 115, Številka: 11Journal Article
Top quark production in the forward region in proton-proton collisions is observed for the first time. The W+b final state with W→μν 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.
