Merging NLO multi-jet calculations with improved unitarization

Bellm, Johannes; Gieseke, Stefan; Plätzer, Simon

Abstract

We present an algorithm to combine multiple matrix elements at LO and NLO with a parton shower. We build on the unitarized merging paradigm. The inclusion of higher orders and multiplicities reduce the scale uncertainties for observables sensitive to hard emissions, while preserving the features of inclusive quantities. The combination allows further soft and collinear emissions to be predicted by the all-order parton-shower approximation. We inspect the impact of terms that are formally but not parametrically negligible. We present results for a number of collider observables where multiple jets are observed, either on their own or in the presence of additional uncoloured particles. The algorithm is implemented in the event generator Herwig.

Citation

Bellm, J., Gieseke, S., & Plätzer, S. (2018). Merging NLO multi-jet calculations with improved unitarization. The European Physical Journal C, 78(3), Article 244. https://doi.org/10.1140/epjc/s10052-018-5723-2

• Journal Article Type: Article
• Acceptance Date: Mar 9, 2018
• Online Publication Date: Mar 21, 2018
• Publication Date: Mar 21, 2018
• Deposit Date: Apr 9, 2018
• Publicly Available Date: Apr 9, 2018
• Journal: European Physical Journal C: Particles and Fields
• Print ISSN: 1434-6044
• Electronic ISSN: 1434-6052
• Publisher: SpringerOpen
• Peer Reviewed: Peer Reviewed
• Volume: 78
• Issue: 3
• Article Number: 244
• DOI: https://doi.org/10.1140/epjc/s10052-018-5723-2