![]() ![]() ![]() 5 LETTER WORDS NLO HOW TOWe introduce a simple procedure that resolves the long-standing question of how to account for single-logarithmic spin-correlation effects in parton showers not just in the collinear limit, but also in the soft wide-angle limit, at leading colour. The work in this paper represents the last step required for final-state massless showers to satisfy the broad PanScales next-to-leading logarithmic accuracy goals. Our showers provide a reference for its single-logarithmic resummation. To help probe wide-angle soft spin correlation effects, we introduce a new declustering-based non-global spin-sensitive observable, the first of its kind. Comparisons to fixed-order matrix elements help validate our approach up to third order in the strong coupling, and an appendix demonstrates the small size of residual subleading-colour effects. We discuss its implementation in the context of the PanScales family of parton showers, where it complements our earlier treatment of the. While we carry out our tests within the PanScales shower framework, the schemes are sufficiently simple that it should be straightforward to implement them also in other shower frameworks. Subleading colour issues remain at NLL (single logarithms) for non-global observables, though one of our two schemes reproduces the correct full-colour matrix-element for any number of energy-ordered commensurate-angle pairs of emissions. 5 LETTER WORDS NLO FULLIn particular we show that the new schemes give the correct full colour NLL terms for global observables and multiplicities. We study the resulting effective multiple-emission matrix elements generated by the shower, and discuss their impact on subleading colour contributions to leading and next-to-leading logarithms (NLL) for a range of observables. In this work, concentrating on final-state showers, we present two simple, computationally efficient prescriptions to correct this problem, exploiting a Lund-diagram type classification of emission regions. Maybe - Maybe is a great word to use when you don't want to get yourself stuck into a commitment.įor example, if you have the letters T W L or O C T W L in your rack, you could form words such as CLOWN, CLOTH, COLTS, OWLET, SCOWL, or TOWEL provided you have the other letters available for use.Standard dipole parton showers are known to yield incorrect subleading-colour contributions to the leading (double) logarithmic terms for a variety of observables. Lunch - Whether you decide to eat or not, you're likely given a lunch break at work. Their - If those are their belongings, they certainly don't belong to you.Įvery - Like the word all, every encompasses the totality of what you're discussing.įaith - Faith means something different to everyone, but it's certainly meant to be a positive word. Which - Choices can be narrowed down depending on which option you choose. Other - Other makes a distinction between objects or people.Ībout - When talking about approximate size, you might say that the fish that got away was about two feet long. Just thinking about some words that you use daily in the course of life can grant you some good options. ![]()
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