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.

First Observation of Top Quark Production in the Forward Region

GERACI, ANGELO;
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 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 5020  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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/965627
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