Two-loop scalar self-energies in a general renormalizable theory at leading order in gauge couplings

I present results for the two-loop self-energy functions for scalars in a general renormalizable field theory, using mass-independent renormalization schemes based on dimensional regularization and dimensional reduction. The results are given in terms of a minimal set of loop-integral basis functions, which are readily evaluated numerically by computers. This paper contains the contributions corresponding to the Feynman diagrams with zero or one vector propagator lines. These are the ones needed to obtain the pole masses of the neutral and charged Higgs scalar bosons in supersymmetry, neglecting only the purely electroweak parts at two-loop order. A subsequent paper will present the results for the remaining diagrams, which involve two or more vector lines.Comment: 26 pages, 4 figures, revtex4, axodraw.sty. Version 2: sentence after eq. (A.13) corrected, references added. Version 3: typos in eqs. (5.17), (5.20), (5.21), (5.32) are corrected. Also, the MSbar versions of eqs. (5.32) and (5.33) are now include

The Physics of the B Factories

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C

Enhanced anisotropic magnetoresistance of ion-beam-deposited Ni80Fe20-NixFe1-xO composite films

Composite films of Ni80Fe20-NixFe1-xO were prepared by a dual ion-beam deposition technique. Magnetoresi stance (MR) was measured both at 77 and 298 K in a magnetic field applied in plane, parallel and perpendicular to the electrical current. Typical anisotropic magnetoresistance (AMR) was observed in as-deposited and annealed samples. The most interesting result is that for annealed samples, the shape of the MR curve is sharp and symmetric and the total MR ratio increases with oxygen content in the films, as compared with as-deposited samples. Furthermore, the total MR ratio reaches a maximum (similar to 4.5 and 14% at 298 and 77 K, respectively) in films prepared with 44% oxygen in the assist beam. This enhanced AMR is attributed to the strong anisotropic scattering at interfaces between the ferromagnetic metal and oxide phases

Tuning microstructural and magnetic properties of ion-beam-deposited Ni80Fe20/Ni(x)Fe1-xO composite films

Composite films of Ni80Fe20/NixFe1-xO were prepared by dual ion-beam deposition. The structural and magnetic properties of these composite films were studied. The as-deposited Ni80Fe20 films (a = 3.55 angstrom) consist of f.c.c. nanocrystallites while films prepared with 55% O-2 in the assist beam consist of a rock-salt structure NixFe1-xO (a = 4.21 angstrom) solid solution. The rock-salt phase undergoes an unusual dissociation reaction from NixFe1-xO into Ni (a = 3.52 angstrom), NiO (a = 4.19 angstrom), and NiFe2O4 (a = 8.33 angstrom) upon annealing. The differences (Delta) in magnetic moment at 10 K between zero-field-cooled (ZFC) and field-cooled (FC) curves are closely related to the interphase exchange interaction in these composite films. Suppression of the Curie temperature (TC) was observed in both pure Permalloy and Ni80Fe20/NixFe1-xO composite films, and the T-C depression was reduced by annealing

Magnetic, Mössbauer, and resistivity studies of amorphous Fe\u3csub\u3e74\u3c/sub\u3eZr\u3csub\u3e26\u3c/sub\u3e and Fe\u3csub\u3e81\u3c/sub\u3eHf\u3csub\u3e19\u3c/sub\u3e alloys

Amorphous metal-metal samples of Fe74Zr26 and Fe81Hf19 have been studied by bulk magnetic, Mössbauer spectroscopy and resistivity measurements. The values of Tc have been determined to be 285 K and 295 K for Fe74Zr26 and Fe81Hf19, respectively. Both the magnetic isotherms and Mössbauer measurements indicate that these samples are ferromagnetics. The isomer shifts and the quadrupole interactions are much smaller than those of amorphous Fe-metalloid systems. The P(H) are broad and extend to small H values. Negative temperature coefficients of the resistivity are observed at low temperatures followed by a resistivity minimum at temperatures slightly above room temperature. These results are significantly different from those of amorphous Fe-metalloid systems with comparable Fe contents

Radiological protection of the patient in veterinary medicine and the role of ICRP

At the request of the Main Commission of the International Commission on Radiological Protection (ICRP), Task Group 107 (TG107) was set up to consider the issue of radiological protection of the patient in veterinary medicine. TG107, who authored this article, brought together information relating to the use of diagnostic imaging and radiation oncology in veterinary medicine. A number of specific areas were identified that appeared to be appropriate for attention by ICRP. These included the use of dose quantities and units, the need for re-evaluation of stochastic and deterministic risks from ionising radiation in animals, and the growing use of imaging and therapeutic equipment for animals that is little different from that available to humans. TG107 unanimously recommended that it was both appropriate and timely for ICRP to consider and advise on these issues, and the Main Commission agreed. This paper summarises the findings of TG107