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Nils HT

Nils Hermansson-Truedsson

Affiliated

Nils HT

Isospin-breaking corrections to light-meson leptonic decays from lattice simulations at physical quark masses

Author

  • Peter Boyle
  • Matteo Di Carlo
  • Felix Erben
  • Vera Gülpers
  • Maxwell T. Hansen
  • Tim Harris
  • Nils Hermansson-Truedsson
  • Raoul Hodgson
  • Andreas Jüttner
  • Fionn hÓgáin
  • Antonin Portelli
  • James Richings
  • Andrew Zhen Ning Yong
Show all

Summary, in English

The decreasing uncertainties in theoretical predictions and experimental measurements of several hadronic observables related to weak processes, which in many cases are now smaller than O(1%), require theoretical calculations to include subleading corrections that were neglected so far. Precise determinations of leptonic and semi-leptonic decay rates, including QED and strong isospin-breaking effects, can play a central role in solving the current tensions in the first-row unitarity of the CKM matrix. In this work we present the first RBC/UKQCD lattice calculation of the isospin-breaking corrections to the ratio of leptonic decay rates of kaons and pions into muons and neutrinos. The calculation is performed at fixed lattice spacing (a−1 ≃ 1.730 GeV) on a 483× 96 volume with Nf = 2 + 1 dynamical quarks close to the physical point and domain wall fermions in the Möbius formulation are employed. Long-distance QED interactions are included according to the QEDL prescription and the crucial role of finite-volume electromagnetic corrections in the determination of leptonic decay rates, which produce a large systematic uncertainty, is extensively discussed. Finally, we study the different sources of uncertainty on |Vus|/|Vud| and observe that, if finite-volume systematics can be reduced, the error from isospin-breaking corrections is potentially sub-dominant in the final precision of the ratio of the CKM matrix elements.

Department/s

  • Theoretical Particle Physics - Has been reorganised

Publishing year

2023-03

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2023

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • CKM Parameters
  • Hadronic Matrix Elements and Weak Decays
  • Lattice QCD
  • Standard Model Parameters

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479