Lecture Notes in Physics EditorialBoard R.Beig,Wien,Austria J.Ehlers,Potsdam,Germany U.Frisch,Nice,France K.Hepp,Zu¨rich,Switzerland W.Hillebrandt,Garching,Germany D.Imboden,Zu¨rich,Switzerland R.L.Jaffe,Cambridge,MA,USA R.Kippenhahn,Go¨ttingen,Germany R.Lipowsky,Golm,Germany H.v.Lo¨hneysen,Karlsruhe,Germany I.Ojima,Kyoto,Japan H.A.Weidenmu¨ller,Heidelberg,Germany J.Wess,Mu¨nchen,Germany J.Zittartz,Ko¨ln,Germany 3 Berlin Heidelberg NewYork Barcelona HongKong London Milan Paris Singapore Tokyo TheEditorialPolicyforProceedings TheseriesLectureNotesinPhysicsreportsnewdevelopmentsinphysicalresearchandteaching–quickly, informally,andatahighlevel.Theproceedingstobeconsideredforpublicationinthisseriesshouldbelimited toonlyafewareasofresearch,andtheseshouldbecloselyrelatedtoeachother.Thecontributionsshouldbe ofahighstandardandshouldavoidlengthyredraftingsofpapersalreadypublishedorabouttobepublished elsewhere.Asawhole,theproceedingsshouldaimforabalancedpresentationofthethemeoftheconference includingadescriptionofthetechniquesusedandenoughmotivationforabroadreadership.Itshouldnot beassumedthatthepublishedproceedingsmustreflecttheconferenceinitsentirety.(Alistingorabstracts ofpaperspresentedatthemeetingbutnotincludedintheproceedingscouldbeaddedasanappendix.) 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Westronglyrecommendthatyoumakeuseofthisoffer,sincetheresultwillbeabookofconsiderably improvedtechnicalquality.Toavoidmistakesandtime-consumingcorrespondenceduringtheproduction periodtheconferenceeditorsshouldrequestspecialinstructionsfromthepublisherwellbeforethebeginning oftheconference.Manuscriptsnotmeetingthetechnicalstandardoftheserieswillhavetobereturnedfor improvement. ForfurtherinformationpleasecontactSpringer-Verlag,PhysicsEditorialDepartmentII,Tiergartenstrasse17, D-69121Heidelberg,Germany Serieshomepage–http://www.springer.de/phys/books/lnpp Peter Breitenlohner Dieter Maison (Eds.) Quantum Field Theory Proceedings of the Ringberg Workshop Held at Tegernsee, Germany, 21-24 June 1998 On the Occasion of Wolfhart Zimmermann’s 70th Birthday 1 3 Editors PeterBreitenlohner DieterMaison Werner-Heisenberg-Institut Max-Planck-Institutfu¨rPhysik Fo¨hringerRing6 80805Mu¨nchen,Germany LibraryofCongressCataloging-in-PublicationDataappliedfor. DieDeutscheBibliothek-CIP-Einheitsaufnahme Quantumfieldtheory:proceedingsoftheRingbergWorkshop,heldat Tegernsee,Germany,21-24June1998ontheOccasionofWolfhart Zimmermann’s70thBirthday/PeterBreitenlohner;DieterMaison (ed.).-Berlin;Heidelberg;NewYork;Barcelona;HongKong; London;Milan;Paris;Singapore;Tokyo:Springer,2000 (Lecturenotesinphysics;Vol.558) ISBN3-540-67972-3 ISSN0075-8450 ISBN3-540-67972-3Springer-VerlagBerlinHeidelbergNewYork Thisworkissubjecttocopyright.Allrightsarereserved,whetherthewholeorpartofthe materialisconcerned,specificallytherightsoftranslation,reprinting,reuseofillustra- tions, recitation, broadcasting, reproduction on microfilm or in any other way, and storageindatabanks.Duplicationofthispublicationorpartsthereofispermittedonly undertheprovisionsoftheGermanCopyrightLawofSeptember9,1965,initscurrent version,andpermissionforusemustalwaysbeobtainedfromSpringer-Verlag.Violations areliableforprosecutionundertheGermanCopyrightLaw. Springer-VerlagBerlinHeidelbergNewYork amemberofBertelsmannSpringerScience+BusinessMediaGmbH ©Springer-VerlagBerlinHeidelberg2000 PrintedinGermany Theuseofgeneraldescriptivenames,registerednames,trademarks,etc.inthispublication doesnotimply,evenintheabsenceofaspecificstatement,thatsuchnamesareexempt fromtherelevantprotectivelawsandregulationsandthereforefreeforgeneraluse. Typesetting:Camera-readybytheauthors/editors Coverdesign:design&production,Heidelberg Printedonacid-freepaper SPIN:10780725 55/3141/du-543210 P. Breitenlohner and D. Maison (Eds.): Proceedings 1998, LNP 558, pp. 3−14, 2000. (cid:211) Springer-Verlag Berlin Heidelberg 2000