Introducing an interface between FeynRules and WHIZARD

Abstract

While Monte Carlo event generators like WHIZ-ARD have become indispensable tools in studying the impact of new physics on collider observables over the last decades, the implementation of new models in such packages has remained a rather awkward and error-prone process. Recently, the FEYNRULES package was introduced which greatly simplifies this process by providing a single unified model format from which model implementations for many different Monte Carlo codes can be derived automatically. In this note, we present an interface which extends FEYNRULES to provide this functionality also for the WHIZARD package, thus making WHIZARD's strengths and performance easily available to model builders.

FeynRules 2.0 — A complete toolbox for tree-level phenomenology

“…While some of the interfaces have been the subject of separate publications [44,47], we include a summary on how to run all the interfaces for the sake of completeness.…”

“…The full details of this interface can be found in Ref. [47]. We will summarize some of the most important points.…”

“…The full list of vertices supported by this interface can be found in Table 1 of Ref. [47] and comprises a large number of the possible vertices for these spins and color representations. When an unsupported vertex is identified, a warning message is printed, the vertex is skipped and the interface continues to process the other vertices.…”

“…A new export interface to Whizard was written [47] that allows the output of models in the native format of Whizard. One highlight of this interface is that it not only supports unitary and Feynman gauge, but will automatically generate R ξ gauge model files from a model implemented in Feynman gauge.…”

“…The resulting output was tested between gauges and with CalcHep and MadGraph for the SM, MSSM and 3-Site model. In conjunction with these validations, the first phenomenological study with this interface was performed [48]. See Section 6.8 for further details.…”