Next-to-leading order QCD predictions for top-quark pair production with up to three jets

• Published in: The European physical journal. C, Particles and fields Vol. 77; no. 3; pp. 1 - 11
• Main Authors: Höche, S., Maierhöfer, P., Moretti, N., Pozzorini, S., Siegert, F.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 07-03-2017; Springer; Springer Nature B.V; Springer Science + Business Media
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heavy Ions; Jets; Letter; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Pair production; Physics; Physics and Astronomy; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Quantum chromodynamics; Quantum Field Theories; Quantum Field Theory; Quarks; String Theory; Sudakov Form Factor; Scale Uncertainty; MiNLO Procedure; Large Hadron Collider; Multijet Production
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-017-4715-y

We present theoretical predictions for the production of top-quark pairs with up to three jets at the next-to leading order in perturbative QCD. The relevant calculations are performed with
Sherpa
and
OpenLoops
. To address the issue of scale choices and related uncertainties in the presence of multiple scales, we compare results obtained with the standard scale
H
T
/
2
at fixed order and the M
i
NLO procedure. Analyzing various cross sections and distributions for
t
t
¯
+
0
,
1
,
2
,
3
 jets at the 13 TeV LHC we find a remarkable overall agreement between fixed-order and M
i
NLO results. The differences are typically below the respective factor-two scale variations, suggesting that for all considered jet multiplicities missing higher-order effects should not exceed the ten percent level.