Next-to-leading order QCD predictions for top-quark pair production with up to two jets merged with a parton shower

Stefano Pozzorini,Stefan Höche,Frank Siegert,Marek Schönherr,Philipp Maierhöfer,Frank Krauss

doi:10.1016/j.physletb.2015.06.060

Stefano Pozzorini, Stefan Höche + Show 4 more

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https://doi.org/10.1016/j.physletb.2015.06.060

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Abstract

We present differential cross sections for the production of top-quark pairs in conjunction with up to two jets, computed at next-to-leading order in perturbative QCD and consistently merged with a parton shower in the Sherpa+OpenLoops framework. Top quark decays including spin correlation effects are taken into account at leading order accuracy. The calculation yields a unified description of top-pair plus multi-jet production, and detailed results are presented for various key observables at the Large Hadron Collider. A large improvement with respect to the multi-jet merging approach at leading order is found for the total transverse energy spectrum, which plays a prominent role in searches for physics beyond the Standard Model.

Highlights

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We present differential cross sections for the production of top-quark pairs in conjunction with up to two jets, computed at next-to-leading order in perturbative QCD and consistently merged with a parton shower in the Sherpa+OpenLoops framework
A large improvement with respect to the multi-jet merging approach at leading order is found for the total transverse energy spectrum, which plays a prominent role in searches for physics beyond the Standard Model

Summary

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