6 papers · 1 filter
Timelike showers with jet recoils
Jack Helliwell, Ludovic Scyboz, Peter Skands
We propose a new way to impose four-momentum conservation on timelike parton-shower branchings, allowing for recoil to be imparted not only to individual partons but also to groups…
Anomalous scaling of linear power corrections
Casey Farren-Colloty, Jack Helliwell, Rtvik Patel +2
Non-perturbative corrections to hadronic observables represent a critical obstacle to increasing accuracy at colliders. Long taken to scale simply as , where is the centre…
Logarithmically-accurate and positive-definite NLO shower matching
Melissa van Beekveld, Silvia Ferrario Ravasio, Jack Helliwell +6
We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in collision…
A new standard for the logarithmic accuracy of parton showers
Melissa van Beekveld, Mrinal Dasgupta, Basem Kamal El-Menoufi +9
We report on a major milestone in the construction of logarithmically accurate final-state parton showers, achieving next-to-next-to-leading-logarithmic (NNLL) accuracy for the wid…
Two-loop anomalous dimensions for small- jet versus hadronic fragmentation functions
Melissa van Beekveld, Mrinal Dasgupta, Basem Kamal El-Menoufi +3
We study the collinear fragmentation of highly energetic jets defined with a small jet radius. In particular, we investigate how the corresponding fragmentation functions differ fr…
A collinear shower algorithm for NSL non-singlet fragmentation
Melissa van Beekveld, Mrinal Dasgupta, Basem Kamal El-Menoufi +3
We formulate a collinear partonic shower algorithm that achieves next-to-single-logarithmic (NSL, ) accuracy for collinear-sensitive non-singlet fragmentation obser…