H. EberlRECFA meeting, Innsbruck 2004

H. EberlRECFA meeting. Innsbruck 2004 Members Walter Majerotto Helmut Eberl Wolfgang Lucha Sabine Kraml Christian Weber – fixed term pos. Karol Kovařík – PhD student Wilhelm Öller – PhD student

H. EberlRECFA meeting. Innsbruck 2004 Working Fields Supersymmetry (SUSY) H. Eberl, K. Kovařík, S. Kraml, W. Majerotto, W. Öller, C. Weber Bound quark states, Finite quantum field theories W. Lucha

H. EberlRECFA meeting. Innsbruck 2004 Supersymmetry The way to the Theory of Everything? SUPERSYMMETRY – or SUSY for short - is a symmetry between matter particles (fermions) and carriers of force (bosons). It offers the possibility of embedding the Standard Model of particles into a larger and a more complete theory. Symmetries play a central rôl e in modern physics (like in Arts), as they reflect the fundamental laws of Nature. a

H. EberlRECFA meeting. Innsbruck 2004 Principle of Symmetry: Symmetry transformations do not change the form of the laws of Nature as illustrated here in this four pictures all representing our beloved Marylin despite the colour and mirror transformations

H. EberlRECFA meeting. Innsbruck 2004 BosonenFermionen SUSY - The true love of particle physists? SUSY particle spectrum. green: known particles of the Standard Model. red: new particles (Higgs bosons and SUSY partners). In a supersymmetric theory, for every particle there exist a partner particle. If SUSY is realized in Nature then for every known SM particle there must be a supersymmetric partner.

H. EberlRECFA meeting. Innsbruck 2004 SUSY-particles in experiments Here we see a possible squark- gluino production at LHC and the additional cascade decays of them. The search for these new supersymmetric particles is one of the main tasks of the experiments at the Tevatron in the USA, at LHC at CERN, and at a Future Linear Collider. SUSY particles can have very spectacular signatures due to cascade decays. In the right figure we see a simulation of such a signature in the CMS detector. Die Suche nach diesen neuen supersymmetrischen Teilchen ist eine der vorrangigen Aufgaben der großen Experimente am Tevatron in den USA, am LHC, am CERN und am geplanten e + e - Linear Collider.

H. EberlRECFA meeting. Innsbruck 2004 Main Topics of the SUSY Group a possible source Renormalization CP violation in SUSY Lepton flavour violation Loop calculations radiativecorrections

H. EberlRECFA meeting. Innsbruck 2004 Renormalization in the MSSM Goal: Access to higher fundamental “GUT” scale Precision experiments – Born approximation is not sufficient. Inclusion of “loop” contributions necessary! Our contribution: compared to the SM, in the MSSM there are mass matrices (for sfermions, charginos and neutralinos) and related mixing matrices which have to be renormalized. We worked out a consistent concept of renormalization and applied it to many production and decay processes: SUSY-QCD: gluon and gluino one-loop contributions, e.g. Higgs decays into fermions and sfermions Sfermion decays into chargino, neutralino, W, Z, and Higgs bosons (also crossed channels studied) 3 rd gen, sfermion production at a LC Problem with convergence: Resummation necessary – Improvement worked out

H. EberlRECFA meeting. Innsbruck 2004 Yukawa type corrections: calculated examples are Sfermion pair prod. at a LC Single Higgs boson prod. at a LC Full one-loop corrections: very complex calculations, done by hand and checked by automatic tools: A0 decay to sfermion pair other Higgs decay channels to sfermions in progress Higgs decays to charginos and neutralinos (still in progress) Sfermion, chargino and neutralino pair productions in e + e - annihilations

H. EberlRECFA meeting. Innsbruck 2004 CP Violation: The SM cannot explain sufficiently CP viol. which is a necessary ingredient for the particle-antiparticle asymmetry built by baryogenesis (or leptogenesis). Many complex parameters in general SUSY – sources for CP violation CP sensitive observables proposed by our group (Triple products, …) applied to e.g. H + to t b,   e + e - to tops, charginos, and neutralinos, and additonal decays - Lepton Flavour Violation: Mass matrices of charged leptons allow large LFV despite the strong bounds of rare decays like  -  t  e -  A possible signatur: e + e - to e +  - Also combined studies on CP and LFV Lepton Flavour Violation:

H. EberlRECFA meeting. Innsbruck 2004 Contributions to workshops: EU project: We are a small group. Despite this fact participated in workshops on LEP, LHC, LC, CLIC and muon collider member of the running EU network RMT on collider physics New project has been submitted this year W. M. – convenor activity

H. EberlRECFA meeting. Innsbruck 2004 International collaborations Y. Yamada, K. Hidaka - Japan T. Gajdosik – Vilnius, Lithuania D. Denegri - CMS - CERN W. Porod - Zürich H. Fraas, O. Kittel - Würzburg G. Moortgat-Pick - Durham J. Valle - Valencia U. Martyn, L. Rurua – DESY Hamburg M. Beccaria - Lecce C. Verzegnassi - Trieste F. Renard - Montpellier V. Spanos - Minneapolis EU Marie-Curie fellowship at Hephy Vienna

H. EberlRECFA meeting. Innsbruck 2004 Publications HEP we get from the web