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

Journal Article · Tue Sep 01 00:00:00 EDT 2015 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2015.06.060· OSTI ID:1209156

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

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. As a result, 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.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); Swiss National Science Foundation (SNSF); European Commission (EC)
• Contributing Organization: Open Science Grid; National Science Foundation, Arlington, VA (United States)
• Grant/Contract Number: AC02-76SF00515; PP00P2_153027
• OSTI ID: 1209156
• Alternate ID(s): OSTI ID: 1134556; OSTI ID: 1204543
• Report Number(s): SLAC-PUB-15911; S0370269315004827; PII: S0370269315004827
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Vol. 748 Journal Issue: C; ISSN 0370-2693
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

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