https://doi.org/10.1140/epjc/s10052-017-5160-7
Regular Article - Theoretical Physics
Combining states without scale hierarchies with ordered parton showers
1
School of Physics and Astronomy, Monash University, Clayton, VIC, 3800, Australia
2
Fermi National Accelerator Laboratory, Batavia, IL, 60510-0500, USA
* e-mail: nadine.fischer@monash.edu
Received:
26
June
2017
Accepted:
23
August
2017
Published online:
12
September
2017
We present a parameter-free scheme to combine fixed-order multi-jet results with parton-shower evolution. The scheme produces jet cross sections with leading-order accuracy in the complete phase space of multiple emissions, resumming large logarithms when appropriate, while not arbitrarily enforcing ordering on momentum configurations beyond the reach of the parton-shower evolution equation. This requires the development of a matrix-element correction scheme for complex phase-spaces including ordering conditions as well as a systematic scale-setting procedure for unordered phase-space points. The resulting algorithm does not require a merging-scale parameter. We implement the new method in the Vincia framework and compare to LHC data.
© The Author(s), 2017
