Measurement of the Differential Cross-section of Highly Boosted Top Quarks as a Function of Their Transverse Momentum in {u221A}s
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2016 |
ISBN-10 | : OCLC:1066365969 |
ISBN-13 | : |
Rating | : 4/5 (69 Downloads) |
Book excerpt: The differential cross-section for pair production of top quarks with high transverse momentum is measured in 20.3 fb-1of proton-proton collisions at a center-of-mass energy of 8 TeV. The measurement is performed for tt¯ events in the lepton+jets channel. The cross-section is reported as a function of the hadronically decaying top quark transverse momentum for values above 300 GeV. The hadronically decaying top quark is reconstructed as an anti-kt jet with radius parameter R=1.0 and identified with jet substructure techniques. The observed yield is corrected for detector effects to obtain a cross-section at particle level in a fiducial region close to the event selection. A parton-level cross-section extrapolated to the full phase space is also reported for top quarks with transverse momentum above 300 GeV. As a result, the predictions of a majority of next-to-leading-order and leading-order matrix-element Monte Carlo generators are found to agree with the measured cross-sections.