Probing Hadronic Structure with The Decay Δ→Nl+l−\Delta\rightarrow Nl^+l^-

We compute the branching ratio for $\Delta\rightarrow Ne^+e^-$ and $\Delta\rightarrow N\mu^+\mu^-$ in chiral perturbation theory and find that both decays should be observable at CEBAF. With sufficiently low thresholds on the $e^+e^-$ invariant mass a branching ratio of $\sim 10^{-5}$ may be observed for $\Delta\rightarrow Ne^+e^-$. For the $\Delta\rightarrow N\mu^+\mu^-$ decay mode we predict a branching ratio of $3\times 10^{-7}$. The dependence of the M1 and E2 amplitudes on the momentum transfer will provide a useful test of chiral perturbation theory which predicts $\sim 20\%$ variation over the allowed kinematic range.Comment: 6 pages, 3 figures, UCSD/PTH 93-06, QUSTH-93-02, Duke-TH-93-4

Decuplet baryon magnetic moments in a QCD-based quark model beyond quenched approximation

We study the decuplet baryon magnetic moments in a QCD-based quark model beyond quenched approximation. Our approach for unquenching the theory is based on the heavy baryon perturbation theory in which the axial couplings for baryon - meson and the meson-meson-photon couplings from the chiral perturbation theory are used together with the QM moment couplings. It also involves the introduction of a form factor characterizing the structure of baryons considered as composite particles. Using the parameters obtained from fitting the octet baryon magnetic moments, we predict the decuplet baryon magnetic moments. The $\Omega^-$ magnetic moment is found to be in good agreement with experiment: $\mu_{\Omega^-}$ is predicted to be $-1.97 \mu_N$ compared to the experimental result of ($-$2.02 $\pm$ 0.05) $\mu_N$.Comment: 19 pages, 2 figure

Electromagnetic Moments of the Baryon Decuplet

We compute the leading contributions to the magnetic dipole and electric quadrupole moments of the baryon decuplet in chiral perturbation theory. The measured value for the magnetic moment of the $\Omega^-$ is used to determine the local counterterm for the magnetic moments. We compare the chiral perturbation theory predictions for the magnetic moments of the decuplet with those of the baryon octet and find reasonable agreement with the predictions of the large--$N_c$ limit of QCD. The leading contribution to the quadrupole moment of the $\Delta$ and other members of the decuplet comes from one--loop graphs. The pionic contribution is shown to be proportional to $I_z$ (and so will not contribute to the quadrupole moment of $I=0$ nuclei), while the contribution from kaons has both isovector and isoscalar components. The chiral logarithmic enhancement of both pion and kaon loops has a coefficient that vanishes in the $SU(6)$ limit. The third allowed moment, the magnetic octupole, is shown to be dominated by a local counterterm with corrections arising at two loops. We briefly mention the strange counterparts of these moments.Comment: Uses harvmac.tex, 15 pages with 3 PostScript figures packed using uufiles. UCSD/PTH 93-22, QUSTH-93-05, Duke-TH-93-5

A Single-License Approach to Regulating Insurance

State regulation of insurance companies has been criticized for many years because of the burden imposed on insurers by having to comply with the laws of many jurisdictions. These higher costs are passed on to consumers. The problems with the current regulatory structure are prompting calls for increased federal regulation of insurance. However, all proposals to federalize insurance regulation create opportunities for abuse at the hands of the federal government and fail to utilize the benefits of a federal system. This article shows how many of the problems of the current system can be addressed without resorting to a large scale intrusion of federal regulators into insurance markets. The proposed solution calls for minimal federal intervention to provide for jurisdictional competition between states that would be allowed to charter insurers that could operate nationally with only the single license granted by the charter. This single-license approach addresses the most salient concerns of proponents of federal optional chartering. It also has the potential for triggering competition and innovation in insurance products and rates while preserving a meaningful role for state regulation

Opting Out of Fiduciary Duties: A Response to the Anti-Contractarians

Professors Butler and Ribstein present an extensive analysis of opting out of fiduciary duties, based on the contractual theory of the corporation and a substantial body of economic literature, as well as a comprehensive response to prominent corporate law commentators who have argued that private ordering of corporate manager duties should be restricted by mandatory legal rules

Non-classroom special education effectiveness for students with severe developmental, emotional and behavioral disorders

AbstractFew studies exist on the effectiveness of special education day treatment for student youth with emotional and behavioral disorders so severe that they cannot be educated in a day treatment setting. Case studies were performed with two youth who had failed previous special education and day treatment programs. Youth participated in a special education program in a private, non-profit, behavioral health and education agency. Unique to this program were the non-traditional, non-classroom based components of education and therapies. Comprehensive, interdisciplinary interventions resulted in progress for these two youth in areas of medical health, violent /aggressive behavior, communication and social skills, community involvement and educational skills. Additional study needs to be performed on more students along with empirical testing of specific interventions with comparison cases

A Single-License Approach to Regulating Insurance

State regulation of insurance companies has been criticized for many years because of the burden imposed on insurers by having to comply with the laws of many jurisdictions. These higher costs are passed on to consumers. The problems with the current regulatory structure are prompting calls for increased federal regulation of insurance. However, all proposals to federalize insurance regulation create opportunities for abuse at the hands of the federal government and fail to utilize the benefits of a federal system. This article shows how many of the problems of the current system can be addressed without resorting to a large scale intrusion of federal regulators into insurance markets. The proposed solution calls for minimal federal intervention to provide for jurisdictional competition between states that would be allowed to charter insurers that could operate nationally with only the single license granted by the charter. This single-license approach addresses the most salient concerns of proponents of federal optional chartering. It also has the potential for triggering competition and innovation in insurance products and rates while preserving a meaningful role for state regulation

The relational ethics of conflict and identity

The contemporary psychoanalytically inflected vocabulary of relational ethics centres on acknowledgement, witnessing and responsibility. It has become an important code for efforts to connect with otherness across fractures of hurt, oppression and suffering. One can see the deployment of this vocabulary to challenge patterns of exclusion and dehumanisation in zones of intense political conflict in many situations in which destructive hatred reigns. This paper traces some of the use of and disputes over this ‘acknowledgement-based’ relational ethics in the recent work of Jessica Benjamin and Judith Butler. The field of application is their response to Israel’s treatment of the Palestinians, given their position as Jews. The challenge of the acknowledgement agenda leads back to an issue of general concern – the degree to which relational ethics can prise open apparently closed and defensive psychosocial identities

Sustainable intensification? Increased production diminishes omega-3 content of sheep milk

Intensifying agricultural production alters food composition, but this is often ignored when assessing system sustainability, yet it could compromise consumers’ health and the concept of ‘sustainable diets’. Here we consider milk composition from Mediterranean dairy sheep, finding inferior fatty acid (FA) profiles with respect to consumer health as a result of a more intensive system of production. Semi-intensive management did produce 57% more milk per ewe with 20% lower fat content, but inferior fat composition. Milk had a nutritionally poorer fatty acid (FA) profile, with 18% less omega-3 FA (n-3) (19% less long-chain n-3) and 7% less monounsaturated FA but 3% more saturated FA (9% higher in C14:0) concentrations compared with ewes under traditional, extensive management. Redundancy analysis identified close associations between fat composition and animal diets, particularly concentrate supplementation and grazing cultivated pasture - n-3 was associated with grazing diverse, native mountain pastures. The paper questions if identifying such key elements in traditional systems could be deployed for ‘sustainable intensification’ to maintain food quality whilst increasing output