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Interleaved Resonance Decays and Electroweak Radiation in the Vincia Parton Shower

by Helen Brooks, Peter Skands, Rob Verheyen

Submission summary

As Contributors: Rob Verheyen
Preprint link: scipost_202109_00013v1
Code repository: http://pythia.org
Date submitted: 2021-09-10 11:04
Submitted by: Verheyen, Rob
Submitted to: SciPost Physics
Academic field: Physics
Specialties:
  • High-Energy Physics - Phenomenology
Approaches: Computational, Phenomenological

Abstract

We propose a framework for high-energy interactions in which resonance decays and electroweak branching processes are interleaved with the QCD evolution in a single com- mon sequence of decreasing resolution scales. The interleaved treatment of resonance decays allows for a new treatment of finite-width effects in parton showers. At scales above their offshellness (i.e., typically Q > Γ ), resonances participate explicitly as incom- ing and outgoing states in branching processes, while they are effectively “integrated out” of the description at lower scales. We implement this formalism, together with a full set of antenna functions for branching processes involving electroweak (W/Z/H) bosons in the Vincia shower module in Pythia 8.3, and study some of the consequences

Current status:
Editor-in-charge assigned


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Submission scipost_202109_00013v1 on 10 September 2021

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