Top quark production in the forward region in proton-proton collisions is observed for the first time. The W+b final state with Wmunu is reconstructed using muons with a transverse momentum, p_T, larger than 25GeV in the pseudorapidity range 2.0<4.5. The b jets are required to have 50<100GeV and 2.2<4.2, while the transverse component of the sum of the muon and b-jet momenta must satisfy p_T>20GeV. The results are based on data corresponding to integrated luminosities of 1.0 and 2.0fb^-1 collected at center-of-mass energies of 7 and 8TeV by LHCb. The inclusive top quark production cross sections in the fiducial region are sigma(top)[7TeV]=239±53(stat)±33(syst)±24(theory)fb,sigma(top)[8TeV]=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.

First Observation of Top Quark Production in the Forward Region

CENCI, RICCARDO;MARINO, PIETRO;MORELLO, MICHAEL JOSEPH;
2015

Abstract

Top quark production in the forward region in proton-proton collisions is observed for the first time. The W+b final state with Wmunu is reconstructed using muons with a transverse momentum, p_T, larger than 25GeV in the pseudorapidity range 2.0<4.5. The b jets are required to have 50<100GeV and 2.2<4.2, while the transverse component of the sum of the muon and b-jet momenta must satisfy p_T>20GeV. The results are based on data corresponding to integrated luminosities of 1.0 and 2.0fb^-1 collected at center-of-mass energies of 7 and 8TeV by LHCb. The inclusive top quark production cross sections in the fiducial region are sigma(top)[7TeV]=239±53(stat)±33(syst)±24(theory)fb,sigma(top)[8TeV]=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.
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/59690
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