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High Energy Physics - Experiment, hep-ex
MPINP:
LHCb - Abteilung Hinton
Abstract:
Forward top quark pair production is studied in $pp$ collisions in the $\mu
eb$ final state using a data sample corresponding to an integrated luminosity
of 1.93 fb$^{-1}$ collected with the LHCb experiment at a centre-of-mass energy
of 13 TeV. The cross-section is measured in a fiducial region where both
leptons have a transverse momentum greater than 20 GeV and a pseudorapidity
between 2.0 and 4.5. The quadrature sum of the azimuthal separation and the
difference in pseudorapidities, denoted $\Delta R$, between the two leptons
must be larger than 0.1. The $b$-jet axis is required to be separated from both
leptons by a $\Delta R$ of 0.5, and to have a transverse momentum in excess of
20 GeV and a pseudorapidity between 2.2 and 4.2. The cross-section is measured
to be $$\sigma_{t\bar{t}}=
126\pm19\,(\mathrm{stat})\pm16\,(\mathrm{syst})\pm5\,(\mathrm{lumi})\,\,\mathrm{
fb}$$ where the first uncertainty is statistical, the second is systematic, and
the third is due to the luminosity determination. The measurement is compatible
with the Standard Model prediction.