CERN Accelerating science

Talk
Title Ab initio calculation of the neutron-proton mass difference
Video
If you experience any problem watching the video, click the download button below
Download Embed
Show n. of views
Author(s) Lellouch, Laurent (speaker) (Centre de Physique Théorique, CNRS and Aix-Marseille U.)
Corporate author(s) CERN. Geneva
Imprint 2015-06-17. - 4088.
Series (TH Theoretical Seminar)
Lecture note on 2015-06-17T14:00:00
Subject category TH Theoretical Seminar
Abstract The existence and stability of atoms relies on the fact that neutrons are more massive than protons. The mass difference is only 0.14% of the average and has significant astrophysical and cosmological implications. A slightly smaller or larger value would have led to a dramatically different universe. After an introduction to the problem and to lattice quantum chromodynamics (QCD), I will show how this difference can be computed precisely by carefully accounting for electromagnetic and mass isospin breaking effects in lattice computations. I will also report on results for splittings in the \Sigma, \Xi, D and \Xi_{cc} isospin multiplets, some of which are predictions. The computations are performed in lattice QCD plus QED with four, non-degenerate quark flavors.
Copyright/License © 2015-2024 CERN
Submitted by gavin.salam@cern.ch

 


 Registre creat el 2015-06-19, darrera modificació el 2024-06-26


Enllaç extern:
Descarregar el text complet
Event details
  • Send to ScienceWise.info