Title
| Ab initio calculation of the neutron-proton mass difference |
Video
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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 |