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.

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Autorentext

Prof. Dr. Jegerlehner studied physics and received his PhD at Bern University, Switzerland. In 1976 he obtained his Habilitation at Free University of Berlin, Germany. He had been member of the research project Quantumdynamics at the Center of Interdisciplinary Research (ZIF), Bielefeld University. Since 1983 full professor of Theoretical Physics at the University of Bielefeld. 1989-1995 staff at Paul-Scherrer-Institute, Villigen, Switzerland, with teaching position at ETH Zürich and ETH Lausanne, Switzerland. Since 1995 head of the DESY Zeuthen theory group and professor at Humboldt-University Berlin. He had been visiting scientist/professor at Bell Laboratories, Murray Hill/N.J., USA, Wuppertal University, Germany, Bern University, Switzerland, Hannover University, Germany, Centre de Physique Theorique CRNS-Luminy, Marseille, France, Technical University Dresden, Germany. In 2007 he received a Research Grant Institute of Nuclear Physics of the Polish Academy of Sciences, Krakow/Poland and had been awarded in 2008 the Alexander von Humboldt Honorary Research Fellowship by the Polish Science Foundation University Katowice, Poland.

Inhalt
Basic Concepts, Introduction to QED, g 2 in a Nutshell, General Properties and Tools.- Quantum Field Theory and Quantum Electrodynamics.- Lepton Magnetic Moments: Basics.- A Detailed Account of the Theory, Outline of Concepts of the Experiment, Status and Perspectives.- Electromagnetic and Weak Radiative Corrections.- Hadronic Effects.- The g 2 Experiments.- Comparison Between Theory and Experiment and Future Perspectives.