First Observation of Top Quark Production in the Forward Region
- R. Aaijf(Author),
- B. Adevaa(Author),
- M. Adinolfiak(Author),
- A. Affolderr(Author),
- Z. Ajaltounih(Author),
- S. Akarw(Author)
- aUniversity of Santiago de Compostela,
- bNational Institute for Subatomic Physics,
- cPontifícia Universidade Católica do Rio de Janeiro,
- dIstituto Nazionale Di Fisica Nucleare, Frascati,
- eAlikhanov Institute for Theoretical and Experimental Physics,
- fCERN
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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, pT, larger than 25 GeV in the pseudorapidity range 2.0<η<4.5. The b jets are required to have 50<pT<100GeV and 2.2<η<4.2, while the transverse component of the sum of the muon and b-jet momenta must satisfy pT>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 8 TeV by LHCb. The inclusive top quark production cross sections in the fiducial region are σ(top)[7TeV]=239±53(stat)±33(syst)±24(theory)fb,σ(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.
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Original language
EnglishArticle number
112001Journal (Volume, Issue Number)
Physical Review Letters (Volume 115, Issue 11)Publication milestones
- Published - 08/09/2015
Publication status
ISSN
0031-9007External Publication IDs
- Scopus: 84942162907
- WOS: 000360893600006