Merging H/W/Z + 0 and 1 jet at NLO with no merging scale: a path to parton shower + NNLO matching

By K. Hamilton, P. Nason, Carlo Oleari, G. Zanderighi. 2012

281 citations recorded by the source corpus.

A bstractWe consider the POWHEG generator for a H/W/Z boson plus one jet, augmented with the recently proposed MiNLO method for the choice of scales and the inclusion of Sudakov form factors. Within this framework, the generator covers all the transverse- momentum region of the H/W/Z boson, i.e. no generation cuts are needed to obtain a finite result. By construction, the generator achieves NLO accuracy for distributions involving a finite (and relatively large) transverse momentum of the boson. We examine the conditions under which also the totally inclusive distributions (e.g. the boson rapidity distribution) achieve NLO accuracy. We find that a minimal modification of the MiNLO prescription is sufficient to achieve such accuracy. We thus construct a NLO generator for H/W/Z boson plus one jet production such that it smoothly merges into a NLO single boson production in the small transverse-momentum region. We notice that, by simply reweighting the boson rapidity distribution to NNLO predictions, we achieve a NNLO accurate generator matched to a shower. The approach applies to all production processes involving a colorless massive system plus one jet. We discuss how it may be extended to general processes.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1ec4cf77e32cbb9a3e9af7fb56c428c698fbdd33

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Tuning PYTHIA 8.1: the Monash 2013 tune (2014, background): “This is an interesting region intermediate between low-p⊥ bremsstrahlung and high-p⊥ Z+jet processes, which will be particularly relevant to reconsider in the context of matrix-element corrections at the O(α2 s ) level and beyond [87].”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “The variation of the renormalization scale also varies consistently the resummation scale in the Sudakov form factor of the MINLO procedure [369].”
Finite quark-mass effects in the NNLOPS POWHEG+MiNLO Higgs generator (2015, methodology): “[17], based upon the MiNLO method [21], is particularly attractive since it achieves NNLO accuracy without recourse to an unphysical partitioning of phase space.”
HW±/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO (2013, methodology): “Since vector-boson production was explicitly considered in ref [22], the same MiNLO procedure used in that context can be transported and applied to the present case.”
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, methodology): “An NNLO+PS simulation for Higgs boson production, in the infinite top mass limit, has already been presented in [33,34] (which could be extended to include finite top mass effects).”
Handbook of LHC Higgs Cross Sections: 3. Higgs Properties (2013, methodology): “Table 31: Total rates for theH generator (H), the HJ generator with MiNLO (HJ), the HJ gener ator with MiNLO improved according to [287] (HJ-N) and the MiNLO improved HJ J generator.”
Collider physics at the precision frontier (2020, methodology): “It was found that the predictions obtained with the generators HJ-MiNLO [160] and”
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations (2014, background): “NLO (and beyond) mergings are thus inherently more complicated than LO ones, because LO-matching is basically trivial; they have attracted a significant amount of attention lately [184,191,198–207].”