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It seems to be a strange enterprise to attempt write a physics book about a single number. It was not my idea to do so, but why not. In mathematics, maybe, one would write a book about ?. Certainly, the muon’s anomalous magnetic moment is a very special number and today re?ects almost the full spectrum of e?ects incorporated in today’s Standard Model (SM) of fun- mental interactions, including the electromagnetic, the weak and the strong forces. The muon g? 2, how it is also called, is a truly fascinating theme both from an experimental and from a theoretical point of view and it has played a crucial role in the development of QED which ?nally developed into the SM by successive inclusion of the weak and the strong interactions. The topic has fascinated a large number of particle physicists, last but not least it was always a benchmark for theory as a monitor for e?ects beyond what was known at the time. As an example, nobody could believe that a muon is just a heavy version of an electron; why should nature repeat itself, it hardly can make sense.

Muons. --- Nuclear moments. --- Magnetic anomalies. --- Muons --- Moments nucléaires --- Periodicals --- Cycles. --- Quantum theory. --- Physics --- Astrophysics --- General and Others --- Particle Physics --- Physics. --- Nuclear physics. --- Particle and Nuclear Physics. --- Atomic nuclei --- Atoms, Nuclei of --- Nucleus of the atom --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Anomalies, Geomagnetic --- Anomalies, Magnetic --- Geomagnetic anomalies --- Geomagnetism --- Nuclear physics --- Mu mesons --- Kaons --- Leptons (Nuclear physics) --- Mesons --- Pions