Coherent parton showers with local recoils

By Simon Plätzer, S. Gieseke. 2009

147 citations recorded by the source corpus.

We outline a new formalism for dipole-type parton showers which maintain exact energy-momentum conservation at each step of the evolution. Particular emphasis is put on the coherence properties, the level at which recoil effects do enter and the role of transverse momentum generation from initial state radiation. The formulated algorithm is shown to correctly incorporate coherence for soft gluon radiation.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9c10bc7d7cf93a785aaca71342503d7cc36dfc4c

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In Nuclear and High Energy Physics

Citations in the corpus

String formation beyond leading colour (2015, methodology): “ones based on QCD dipoles [13–19]), and better techniques for how to combine them (matching and merging, see [3,12,20–22] and references therein).”
Event generation with Sherpa 2.2 (2019, background): “he emission is either compensated by the spectator if the emitter is a nal-state parton, or otherwise distributed equally among all nal-state particles. This modied recoil scheme was rst proposed in [109] and rened to include massive partons in [105]. It is crucial to obtain reliable predictions for”
Parton Shower Uncertainties in Jet Substructure Analyses with Deep Neural Networks (2016, methodology): “For PYTHIA 8 we study both the default shower and the VINCIA shower [55, 56], and for HERWIG we include both the default (angular ordered) and dipole showers [57, 58], giving us ﬁve diﬀerent parton shower models to study.”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “1 [382] dipole shower module based on [383,384], in a modified version of the algorithms set out in [370,385], and implemented in [386, 387].”
The midpoint between dipole and parton showers (2015, unknown): “In the massless case, this algorithm reduces to the following [17]: (A.12) Note that, following the arguments in [17], the light-cone momentum fraction entering the PDF is still given by x / z = x / x ij , k .”
Analytic boosted boson discrimination (2015, result): “rdering, as expected because the scales at which the functions in the D 2 are evaluated are essentially the relative p T of the dominant emissions in the jet. This agrees with the conclusions of Ref. [89,139], where it was shown that for antenna showers, the choice of p as a shower ordering variable”
Herwig 7.0/Herwig++ 3.0 release note (2015, methodology): “The program, with the help of external libraries used for amplitude calculation, is now able fully automatically to assemble NLO QCD corrections to virtually all Standard Model processes, including matching to both of its partonshower algorithms [16,17], via methods inspired by either the MC@NLO [18”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “In the results we show matched NLO ⊕ PS predictions – to emphasise the similarities of matching and merging at high transverse momenta – with the Q̃-shower but tested with lower statistics that merging according to [993] and matching to the HERWIG 7 dipole shower [994] show similar behaviour.”
Towards an all-orders calculation of the electroweak bubble wall velocity (2020, result): “We have checked that this gives similar results as angular ordered evolution, using the formalism of [43].”
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, methodology): “These are typically only accessed via parton shower Monte Carlo, although there are recent attempts to put these on more solid analytic footing [215,334,335].”