Hanns Stremnitzer

General flavor blind MSSM and CP violation

We study the implications on flavor changing neutral current and CP violating processes in the context of supersymmetric theories without a new flavor structure (flavor blind supersymmetry). The low-energy parameters are determined by the running of the soft breaking terms from the grand unified scale with supersymmetric (SUSY) phases consistent with the electric dipole moment constraints. We find that the CP asymmetry in b{yields}s{gamma} can reach large values potentially measurable at B factories, especially in the low BR(b{yields}s{gamma}) region, while the contributions to electric dipole moments are kept under control through a cancellation mechanism. We perform a fit of the unitarity triangle including all the relevant observables. In this case, no sizable deviations from the standard model expectations are found. Finally, we analyze the SUSY contributions to the anomalous magnetic moment of the muon pointing out its impact on the b{yields}s{gamma} CP asymmetry and on the SUSY spectrum including chargino and top squark masses.

A simple reason based on supersymmetry for replication of chiral families

Abstract In the context of the minimal flavon-chromon preon model, we show that supersymmetry, because of fermion-boson pairing in its field content, provides a rather simple reason for replication of composite quark-lepton families. At the level of minimum number of core constituents, which turns out to be three, it also provides a good reason why one may expect to have just three light chiral families. One crucial prediction is that there must exist complete vector-like families with mass of order 1 TeV for quark-like and few hundred GeV for lepton-like members. This can be tested at SSC, LHC and future high energy e − e + machines.

Confronting the scale-unifying model through νμ−ντ oscillations☆

Abstract It is observed that the recently proposed scale-unifying model based on the idea of supersymmetry and compositeness leads to rather restrictive predictions for neutrino masses and their mixings. One important prediction of the model is the prominence of ν μ −ν τ oscillations, which should certainly be observable in the proposed experiments. The relevance of the model to (a) the MSW explanation for the solar neutrino puzzle, (b) the recently reported 17 keV neutrino, (c) neutrinoless double beta decay and (d) deviations from universality in tau and muon decay is discussed.

Dynamical generation of gauge bosons of hidden local symmetries in nonlinear sigma models

Abstract We demonstrate how quantum corrections generate a kinetic term for the (at tree-level non-propagating) gauge fields of hidden local symmetries in nonlinear sigma models in four space-time dimensions.

The rate of KL → μe decay as a crucial test of the family replication model

It is argued that the family replication model of composite quarks and leptons, and the fermion mass-matrix therein require that the branching ratio of the decay KL → e− μ+ should exceed at least 13 × 10−10. There is likewise a lower limit on K → πμe. These serve as crucial tests of the replication idea.

Hint from the interfamily mass hierarchy: Two vectorlike families in the TeV range.

Their mass pattern and decay modes exhibit certain distinguishing features and characteristic signals. For example, when the CERN LHC and, possibly a future version of the SSC are built, pair production of the vectorlike quarks would lead to systems such as ([ital b[bar b]]+4[ital Z]+[ital W][sup +][ital W][sup [minus]]) and ([ital b[bar b]]+2[ital Z]+[ital W][sup +][ital W][sup [minus]]), while an [ital e][sup [minus]][ital e][sup +] linear collider (NLC) of suitable energy can produce appreciably a single neutral heavy lepton [ital N] together with [nu][sub [tau]], followed by the decay of [ital N] into ([ital Z]+[nu][sub [tau]])[r arrow]([ital e][sup [minus]][ital e][sup +])+[nu][sub [tau]]. This last signal may conceivably materialize even at CERN LEP 200 if [ital N] is lighter than about 190 GeV.

New crucial tests of compositeness of the third and a possible fourth family in e+e− colliders

Abstract Assuming that quarks and Higgs are composite, it has been argued that the compositeness scale of at least the heaviest, i.e. the third and/or a possible fourth family, should be nearly 1 TeV. We point out that in particular the reaction toponium →b b as well as single top decay would provide crucial tests of such compositeness. Other reactions of importance to LEP I, SLC as well as LEP 200 are noted.

Heavy leptons and the magnetic moment of the muon

Abstract Possible existence of a heavy muon, decaying into muon and photon influences the magnetic moment of muons. This contribution is calculated. It is logarithmically divergent. The result for various cut-off values is plotted and discussed.

Non-local effects in the decay of polarized muons

Abstract The energy spectrum for electrons from the decay of polarized muons is calculated. V-A currents are assumed, but the interaction is not assumed to be local. The most general structure tensor is assumed to calculate the spectrum including terms up to the order ( m e / m μ ) 2 .

Contributions of second-class currents to hyperon decays

SummaryRecent measurements of the electron asymmetry of Σ−n beta-decay and that of eν correlation and asymmetries of Λp decay are analysed including pseudotensor andq2-dependent form factors. The result is compared with Wilkinson’s measurement of pseudotensor contributions in beta-decay of mirror nuclei, assuming someSU3 structure of a second-class current. Possible consequences of octet and decuplet representations of the second-class axial vector current are discussed.RiassuntoSi analizzano recenti misure dell’asimmetria degli elettroni del decadimento beta Σ−n e quella della correlazione eν e delle asimmetrie del decadimento di Λp, includendo gli pseudotensori e i fattori di forma dipendenti daq2. Si confronta il risultato con la misura di Wilkinson dei contributi pseudotensoriali nel decadimento beta dei nuclei speculari. Si discutono le possibili conseguenze delle rappresentazioni di ottetto e decupletto della corrente vettoriale assiale di seconda classe.РеэюмеАналиэируются недавние иэмерения асимметрии злектронов Σ−n бета распада и иэмерения корреляции е и асимметрий Λр распада, включая псевдотенэор и эависяшие отq2 форм-факторы. Полученный реэультат сравнивается с иэмерением Вилкинсона псевдотенэорных вкладов в бета-распад эеркальных ядер, предполагаяSU3 структуру тока второго класса. Обсуждаются воэможные следствия октетных и декуплетных представлений аксиально векторного тока второго класса.