CERN Accelerating science

Talk
Title	Ab initio calculation of the neutron-proton mass difference
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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