JHEP01(2019)083.pdf (734.91 kB)
The Sudakov radiator for jet observables and the soft physical coupling
journal contribution
posted on 2023-06-09, 16:05 authored by Andrea BanfiAndrea Banfi, Basem El-Menoufi, Pier Francesco MonniWe present a procedure to calculate the Sudakov radiator for a generic recursive infrared and collinear (rIRC) safe observable whose distribution is characterised by two widely separated momentum scales. We give closed formulae for the radiator at next-to-next-to-leading-logarithmic (NNLL) accuracy, which completes the general NNLL resummation for this class of observables in the ARES method for processes with two emitters at the Born level. As a byproduct, we define a physical coupling in the soft limit, and we provide an explicit expression for its relation to the MS coupling up to O(a 3 s ). This physical coupling constitutes one of the ingredients for a NNLL accurate parton shower algorithm. As an application we obtain analytic NNLL results, of which several are new, for all angularities tx defined with respect to both the thrust axis and the winner-take-all axis, and for the moments of energy-energy correlation F Cx in e +e - annihilation. For the latter observables we find that, for some values of x, an accurate prediction of the peak of the differential distribution requires a simultaneous resummation of the logarithmic terms originating from the two-jet limit and at the Sudakov shoulder.
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Publication status
- Published
File Version
- Published version
Journal
Journal of High Energy PhysicsISSN
1126-6708Publisher
Institute of PhysicsExternal DOI
Issue
83Volume
2019Page range
1-39Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Theoretical Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-01-11First Open Access (FOA) Date
2019-01-11First Compliant Deposit (FCD) Date
2019-01-10Usage metrics
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