Angular reduction in multiparticle matrix elements

A general method for the reduction of coupled spherical harmonic products is presented. When the total angular coupling is zero, the reduction leads to an explicitly real expression in the scalar products within the unit vector arguments of the spherical harmonics. For non-scalar couplings, the reduction gives Cartesian tensor forms for the spherical harmonic products, with tensors built from the physical vectors in the original expression. The reduction for arbitrary couplings is given in closed form, making it amenable to symbolic manipulation on a computer. The final expressions do not depend on a special choice of coordinate axes, nor do they contain azimuthal quantum number summations, nor do they have complex tensor terms for couplings to a scalar. Consequently, they are easily interpretable from the properties of the physical vectors they contain.Comment: This version contains added comments and typographical corrections to the original article. Now 27 pages, 0 figure

Fathers, Families, and the Future: A Plethora of Plausible Predictions

This commentary focuses on new directions in the study of fathers and families. Several topics that are ripe for more theoretical and empirical scrutiny are outlined. These include the biological determinants of fathering, cultural constraints on fathers, the impact of becoming a father on men’s development as adults, and an intergenerational perspective on fathering. The implications of the recent advances in our understanding of gay and lesbian parents for the critical nature of the father’s role in the family are examined. Finally, a wider range of methodological approaches—including qualitative as well as quantitative, experimental as well as correlational—is advocated in order to advance our appreciation of fathers in children’s lives

Negative experiences of non-drinking college students in Great Britain: an interpretative phenomenological analysis

Research relating to alcohol use amongst university students primarily examines the effects of binge drinking. Researchers rarely focus on a range of drinking styles including light or non-drinking. This study was designed to gain an in-depth understanding of the lived experiences of female, first year UK undergraduates, who do not drink alcohol. Semi-structured interviews were conducted with eight participants. Narratives were analysed using interpretative phenomenological analysis (IPA; by Smith and Osborn (Sage 51-80, 2003). Three superordinate themes were identified: managing the feeling that you don’t belong^ highlights the importance of managing social interactions as a non-drinker; experiencing social exclusion recognises the impact on social bonding as a result of insufficient socialising opportunities; and experiencing peer pressure and social stigma highlights the scrutiny and labelling participants endured. These findings provide an understanding of some of the difficulties experienced by these undergraduates as a result of their non-drinking status. Implications of this research are discussed and areas for future research are outlined

Using Spin Correlations to Distinguish Zh from ZA at the International Linear Collider

We investigate how to exploit the spin information imparted to the Z boson in associated Higgs production at a future linear collider as an aid in distinguishing between CP-even and CP-odd Higgs bosons. We apply a generalized spin-basis analysis which allowsus to study the possibilities offered by non-traditional choices of spin projection axis. In particular, we find that the Z bosons produced in association with a CP-even Higgs via polarized collisions are in a single transverse spin-state (>90% purity) when we use the Zh-transverse basis, provided that the Z~bosons are not ultra-relativistic (speed <0.9c). This same basis applied to the associated production of a CP-odd Higgs yields Z's that are an approximately equal mixture of longitudinal and transverse polarizations. We present a decay angular distribution which could be used to distinguish between the CP-even and CP-odd cases. Finally, we make a few brief remarks about how this distribution would be affected if the Higgs boson turns out to not be a CP-eigenstate.Comment: 48 pages, 18 figures, revtex

Possible tsunami along the northwestern coast of the United States inferred from Indian traditions

Subduction of the Juan de Fuca and Gorda plates beneath western North America presents a paradox; despite the fact that there is good evidence of 3 to 4 cm/yr of ongoing convergence, there is a remarkable paucity of either historic or instrumentally recorded shallow subduction earthquakes. Steady aseismic slip along the entire Cascadia subduction zone provides one explanation for this seismic quiescence. However, the Cascadia subduction zone shares many features, including temporal quiescence, with other subduction zones that have experienced very large shallow subduction earthquakes (Heaton and Kanamori, 1984). Yet, there is no direct geologic or historical evidence presently available to confirm that great shallow subduction earthquakes have occurred along the coast of Washington, Oregon, and northern California. However, there are reports describing Indian legends of great sea-level disturbances that may be related to large nearby earthquakes. In this letter, we briefly review the history of exploration and settlement of this region by nonnative people and then discuss legends from Indians in northern Washington and northern California