Opportunities for Lattice QCD in quark and lepton flavor physics

Abstract

This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD in quark and lepton flavor physics. New data generated at Belle II, LHCb, BES III, NA62, KOTO, and Fermilab E989, combined with precise calculations of the relevant hadronic physics, may reveal what lies beyond the Standard Model. We outline a path toward improvements of the precision of existing lattice-QCD calculations and discuss groundbreaking new methods that allow lattice QCD to access new observables.

Exascale applications: skin in the game

“…The advance to exascale capability over the coming decade offers exciting opportunities for ground-breaking discoveries in high-energy and nuclear physics. Exascale computing has the potential to realistically simulate the atomic nucleus and to discover the first harbingers of new laws of nature [11,12,13], revealing a deeper theory which underlies the present 'elementary' particles [14]. These possibilities can be achieved if new and impending advances in computer science via the ECP can be harnessed to provide a software framework that allows lattice QCD applications to efficiently exploit exascale architectures and application scientists to refine that application as new challenges and ideas emerge.…”

Status and future perspectives for lattice gauge theory calculations to the exascale and beyond

“…In 2018, the USQCD collaborations Executive Committee organized several subcommittees to recognize future opportunities and formulate possible goals for lattice field theory calculations in several physics areas. The conclusions of these studies, along with community input, are presented in seven whitepapers [1][2][3][4][5][6][7].…”

“…Fortunately, the distribution of eigenvalues, except for the small- The numerical experiments presented here were performed with an open-source stand-alone compression tool that is available at Ref. [6].…”

“…We also consider rapidly developing new areas of computation such as machine learning (ML) and Big Data approaches and quantum computing. We refer the reader to the companion whitepapers for details of research opportunities in various areas of nuclear and high energy physics [1][2][3][4][5][6].…”

Lattice QCD Impact on Determination of the CKM Matrix

“…This report assumes a factor of three improvement in theoretical precision. A white paper from USQCD on flavor physics [38] will also interest the reader. We see that there is both a need and an expectation that the lattice QCD community will continue to improve our calculations.…”