Theory of the Muon Anomalous Magnetic Moment (Springer Tracts in Modern Physics, 216)

the Theory Of The Muon Anomalous Magnetic Moment Is Particle Physics In A Nutshell. It Is An Interesting, Exciting And Difficult Subject, And This Book Provides A Comprehensive Review Of It. The Theory Of The Muon Anomalous Magnetic Moment Is At The Cutting Edge Of Current Research In Particle Physics, And Any Deviation Between The Theoretical Prediction And The Experimental Value Might Be Interpreted As A Signal Of An As-yet-unknown New Physics. Particlephysicsdiscoveriesattheendofthe20thcenturycon?rmedanam- ingly simple, yet powerful theory that describes fundamental interactions of elementaryparticles. ThistheoryisusuallyreferredtoastheStandardModel of particle physics. It postulates the existence of three generations of quarks andleptons, fourelectroweakandeightstronglyinteractinggaugebosonsand one scalar particle, the Higgs boson. Apart from the Higgs boson, the ex- tenceofallotherparticleshasbeenunambiguouslyestablished. TheStandard Model withstood numerous experimental tests during the last?fteen years, and has been tested at the level of precision sensitive to quantum loop c- rections. Given the fact that the Standard Model is so successful in describing - ture, is there any reason to believe that this theory is incomplete? There are di?erent answers to this question, depending upon how seriously one takes certain theoretical prejudices. Most severe phenomenological problems appear when the Standard Model of particle physics is confronted with c- mological observations. For example, most of the matter in our Universe is in the form of a cold nonbaryonic dark matter that is not possible to - scribe within the Standard Model. The Standard Model has di?culties - plaining observed baryon asymmetry in the Universe because the Cabbibo? Kobayashi?Maskawa mechanism of CP violation is too weak to produce a su?cientmatter-antimatterasymmetryduringthecosmologicalphasetran- tion. Although neutrino oscillations can be easily incorporated into the St- dard Model, such a solution is not considered theoretically appealing. Inadditiontotheseproblemsrootedinexperimentalfacts, therearesho- comings of the Standard Model of a theoretical nature. For example, it does not explain the fermion mass spectrum; there is a hierarchy and naturalness problem;gravityisnotincludedintheStandardModel, andsoon. Manyt- oretical ideas to address these issues have been proposed in the past; among them, themostprominentandwell-developedisthe?supersymmetry? Particlephysicsdiscoveriesattheendofthe20thcenturycon?rmedanam- ingly simple, yet powerful theory that describes fundamental interactions of elementaryparticles. ThistheoryisusuallyreferredtoastheStandardModel of particle physics. It postulates the existence of three generations of quarks andleptons,fourelectroweakandeightstronglyinteractinggaugebosonsand one scalar particle, the Higgs boson. Apart from the Higgs boson, the ex- tenceofallotherparticleshasbeenunambiguouslyestablished. TheStandard Model withstood numerous experimental tests during the last ?fteen years, and has been tested at the level of precision sensitive to quantum loop c- rections. Given the fact that the Standard Model is so successful in describing - ture, is there any reason to believe that this theory is incomplete? There are di?erent answers to this question, depending upon how seriously one takes certain theoretical prejudices. Most severe phenomenological problems appear when the Standard Model of particle physics is confronted with c- mological observations. For example, most of the matter in our Universe is in the form of a cold nonbaryonic dark matter that is not possible to - scribe within the Standard Model. The Standard Model has di?culties - plaining observed baryon asymmetry in the Universe because the Cabbibo? Kobayashi?Maskawa mechanism of CP violation is too weak to produce a su?cientmatter-antimatterasymmetryduringthecosmologicalphasetran- tion. Although neutrino oscillations can be easily incorporated into the St- dard Model, such a solution is not considered theoretically appealing. Inadditiontotheseproblemsrootedinexperimentalfacts,therearesho- comings of the Standard Model of a theoretical nature. For example, it does not explain the fermion mass spectrum; there is a hierarchy and naturalness problem;gravityisnotincludedintheStandardModel,andsoon. Manyt- oretical ideas to address these issues have been proposed in the past; among them,themostprominentandwell-developedisthe?supersymmetry?