Enhancing and Developing DsixTools: The Standard Model Effective Field Theory Toolkit.

• Applicant: Dr. Javier Virto
• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: from 2018 to 2020
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 406385113

DsixTools is a Mathematica package that implements matching conditions and renormalization-group evolution (RGE) within the Standard-Model Effective Field Theory (SMEFT) --above the Electroweak (EW) scale-- and the Weak Effective Theory (WET) --below the EW scale. The package also includes the possibility of running some of the modules in Python. This is a very useful tool for Beyond-the-Standard-Model (BSM) phenomenology, and is being used to produce scientific results of high interest and relevance.DsixTools needs to be extended and developed further, in order to increase its performance and range of applicability. This is particularly important in the present time, when the LHC has pushed the scale of New Physics beyond the EW scale and the SMEFT seems to be the right tool to describe BSM physics model-independently.This project will establish and support a Scientific Network that will enable collaboration among the participants with three main objectives:1. To implement several new important modules in the DsixTools package, such as (but not restricted to) the module "UVmatcher", which will compute automatically one-loop matching conditions for the Wilson coefficients of the SMEFT starting from a predefined Lagrangian. The development of the "UVmatcher" will lead to a scientific publication.2. To complete and extend existing modules, such as the "EWmatcher" to include matching conditions at one loop to the low-energy effective theory to all operators beyond those for b-->s and b-->c transitions, or the "WETrunner" to include the full RGE for the full set of operators. The one-loop matching will lead to another scientific publication.3. To maintain and update DsixTools regularly to account for all developments in a timely fashion, and to complement gradually some of the existing mathematica-based codes with other implementations in Phyton (or other languages), whenever computing speed may demand it. This includes also the maintenance of the DsixTools website, and establishing proper interfaces with other existing public codes by other developers.The proposed Network includes as participants the original developers of the current version of DsixTools, and a number of researchers that are contributing or will contribute to DsixTools in specific aspects of its development.Network activities include 3 meetings per year (a total of six), with the objective of reviewing the status and setting goals for progress on the three objectives enumerated above, and brainstorming on ideas related to those points. Some include an external participant that can contribute significantly to the advancement towards an objective (such as the development of the "UVmatcher") or that can help extend the use of DsixTools in the High-Energy-Physics community.

• DFG Programme: Scientific Networks