Periodic Reporting for period 3 - PanScales (Spanning TeV to GeV scales for collider discoveries and measurements)
Período documentado: 2021-10-01 hasta 2023-03-31
The goal of the PanScales project is to deepen our understanding, and to improve, the core, parton shower, component of general purpose Monte Carlo simulation event generators, the most widely used theoretical tools in particle physics. Almost every analysis of high-energy collider data relies on these simulations.
The project asks questions such as:
What criteria should we be using to assess the scope and accuracy of parton showers?
What accuracy is achieved by some given class of parton shower?
Can we design parton showers with higher accuracies than is possible today?
What are the phenomenological implications of our understanding of parton showers for particle physics phenomenology?
Our hope is that the PanScales project will make it possible to extract more extensive information about the fundamental particles and interactions that make up our universe.
The project asks questions such as:
What criteria should we be using to assess the scope and accuracy of parton showers?
What accuracy is achieved by some given class of parton shower?
Can we design parton showers with higher accuracies than is possible today?
What are the phenomenological implications of our understanding of parton showers for particle physics phenomenology?
Our hope is that the PanScales project will make it possible to extract more extensive information about the fundamental particles and interactions that make up our universe.
In the 30 months since the start of the project, we have laid foundations for investigating the accuracy of parton showers. Main results have been
- specific novel criteria for classifying the accuracy of a parton shower
- development of numerical tests to verify whether specific shower algorithms pass these criteria
- shower design principles that allow them to pass the tests at next-to-leading logarithmic (NLL) accuracy
- development of concrete proof-of-concept showers, which we have demonstrated pass these tests (a subset of the PanLocal and PanGlobal showers shown in the attached image, those for which all points are in agreement with zero and shown in green).
- schemes for treating subleading colour effects and associated tests at leading and next-to-logarithmic accuracy
- schemes for treating collinear spin correlations and novel observables and methods for testing their effects at NLL.
These developments have specifically been for final-state showers.
- specific novel criteria for classifying the accuracy of a parton shower
- development of numerical tests to verify whether specific shower algorithms pass these criteria
- shower design principles that allow them to pass the tests at next-to-leading logarithmic (NLL) accuracy
- development of concrete proof-of-concept showers, which we have demonstrated pass these tests (a subset of the PanLocal and PanGlobal showers shown in the attached image, those for which all points are in agreement with zero and shown in green).
- schemes for treating subleading colour effects and associated tests at leading and next-to-logarithmic accuracy
- schemes for treating collinear spin correlations and novel observables and methods for testing their effects at NLL.
These developments have specifically been for final-state showers.
All the main elements reported above represent progress beyond the state of the art.
Looking to the end of the project, further results that we will work towards include
- extension of our understanding to include initial-state showers
- investigation of the possibility of going to higher logarithmic accuracy
Looking to the end of the project, further results that we will work towards include
- extension of our understanding to include initial-state showers
- investigation of the possibility of going to higher logarithmic accuracy