[en] Higher order electroweak effects can be effectively tested in B decays involving the short distance flavor changing (b→s) transition. We estimate the exclusive rates involving a virtual photon like B → K 0⁺0^- and real photon like B →K*γ. The effects of QCD enhancement, and the resulting e-μ rate difference are discussed. Decays mediated by gluon exchange are also discussed. 13 refs., 1 tab

[en] The exactly soluble relativistic model field theory proposed by Zachariasen is studied. Renormalization of this model is carried out both in the conventional manner, and by choosing the point of renormalization at an arbitrary space-like momentum. The Gell-Mann--Low equations are then set up for the coupling constant, and the exact solution obtained. The asymptotic value of the coupling is seen to go to the bare constant. Some implications of the model are considered. (U.S.)

[en] Renormalizability of the standard SU(2) x U(1) unified gauge model requires charge quantization provided the right-handed neutrinos are absent from the theory

[en] We evaluate the CP violation parameter element of'/element of in the Weinberg model of CP nonconservation. When gluon exchange effects are included, we find element of'/element of approx. -.045, which is in conflict with the experimental measurement element of'/element of = -.003 +- .015

[en] This is a summary of some of the work carried out in electroweak physics by the author in collaboration with postdoctoral fellows and students at Oregon, and other colleagues around the world. The past five years have been extraordinarily productive with over thirty refereed publications and over ten presentations in major conferences. The impact of the work on the field has been very significant, especially that related to B physics. In most cases the work is either inspired by experiments or has important consequences for future experiments. The work completed covers a broad spectrum of topics, and can be divided roughly into the following four categories: (1) rare B decays and methods of measuring CP violation at B factories; (2) models of CP violation and their consequences; (3) neutrino properties; and (4) grand unification and its low energy consequences

[en] Many solutions to the strong CP problem have been suggested in the literature, the most attractive one being due to Peccei and Quinn. The basic idea here is to impose an axial U(1) symmetry on the SU(3)_c x SU(2) x U(1) theory, such that there is an axial quark current A_μ that is conserved up to anomalies. A chiral rotation can then restore CP conservation. The way this symmetry was implemented in SU(3)_c x SU(2) x U(1), through two Higgs doublets, necessarily lead to a pseudo-Goldstone boson, called axion of mass f_πM_πM_W approx. 100 KeV and coupling to quarks approx. f_πM_W approx. 10^-₃. Such an axion was looked for but not found. Recently, Dine, Fischler and Srednicki (DFS) have suggested that a SU(2) x U(1) singlet Higgs transforming non trivially under U_PQ(1) and with a large expectation value renders the axion essentially invisible. If M_X is the expectation value of the singlet Higgs, mass of the axion M_a approx. f_πM_πM_X and pseudoscalar coupling approx. f_πM_X. In grandunified theories we can get fields with large expectation values, which can be singlets under SU(2) x U(1). The implementation of the DFS idea in grand unified theories is discussed

[en] We continued a program of studying micropole insertion devices. These were originally proposed to increase the quality, such as coherence, of photo beams radiated by relativistic electron beams. Further, these devices have the capability of reducing the capital cost, as well as operating expenses associated with synchrotron radiation sources

[en] The spontaneous breaking of grandunified groups like SO(10) or SU(8) x SU(8) can lead to an extra U(1) group beyond Weinberg-Salam (W-S) SU(2) x U(1). Neutral current data are now shown to depend on two more parameters. The data are examined and limits are put on the mass of the extra Z boson. Need for more experiments on parity violation effects in atoms is stressed. 2 figures, 1 table

[en] The spontaneous symmetry breakdown of Grand Unified Groups like SO(10) can lead to an extra U(1) group beyond the SU(2) x U(1) of Weinberg-Salam. The neutral current data in such models could depend on three new parameters beyond the two in the standard model. However, grand unification imposes restriction on coupling constants limiting the analysis to two new parameters. Further, only one new parameter occurs in neutrino-scattering data. More accurate data can thus be used in the future to set limits on these parameters. The present data when used with the more general parametrization no longer determines the value of sin² theta/sub w/ as accurately. This leads to a greater uncertainty in the estimate of the proton lifetime

[en] The theory of loop induced rare decays and the rate asymmetry due to CP violation in charged B Decays in reviewed. After considering b → sγ and b → se⁺e^- decays, the asymmetries for pure penguin process are estimated first. A larger asymmetry can result in those modes where a tree diagram and a penguin diagram interfere, however these estimates are necessarily model dependent. Estimates of Cabbibo suppressed penguins are also considered