In an engaging and thoughtful article in this issue Carol Brock (Brock, 2016) of the University of Kentucky puts forward a typically insightful, modestly understated and detailed analysis of some of the organizing principles behind crystal structures with high Z0. Did I lose your interest already? It sounds obscure doesn’t it? Some crystallographic parameter . . . a few odd, niche structures. W...

We calculate the rate of production of W + Υ and Z0 + Υ in hadron colliders. We find the cross sections for W + Υ and Z0 + Υ to be roughly 0.45 pb and 0.15 pb at the Tevatron and roughly 4 pb and 2 pb at the LHC. The dominant production mechanism involves the binding of a color-octet bb̄ pair into a P-wave bottomonium state which subsequently decays into Υ. The purely leptonic decay modes of Υ, ...

We present the first direct measurement of A(s), the parity-violating coupling of the Z0 boson to the strange quark, using approximately 550 000 e(+)e(-)-->Z0-->hadrons events recorded by the SLC Large Detector with a polarized e(-) beam. We tagged Z0-->s&smacr; events by the absence of B or D hadrons and the presence in each hemisphere of a high momentum K+/- or K(0)(s). Fitting the polar angl...

The standard model for the Semi Definite Programming (SDP) is min c T x s.t. F (x) = F 0 + m i=1 x i F i 0, where each of the F i 's are symmetric matrices. We define the Lagrangian: L(x, Z) = c T x − Tr(ZF (x)), where the dual variable Z is a psd matrix. The Lagrangian is constructed so that max Z0 L(x, Z) = c T x if F (x) 0, +∞ otherwise. Thus, we can express p * as the solution to an unconst...

We study the 2D Euler equation in a bounded simply-connected domain, and establish local uniqueness of flow whose stream function ψε satisfies{−ε2Δψε=∑i=1k1Bδ(z0,i)(ψε−με,i)+γ,inΩ,ψε=0,on∂Ω, with ε→0+ scale parameter vortices, γ∈(0,∞), Ω⊂R2 simply connected Lipschitz z0,i∈Ω limiting location ith vortex, με,i flux constants unprescribed. Our proof is achieved by detailed description asymptotic b...

Flat multiconductor cable of the type used for mass insulation displacement connection (i.d.c.) typically has a characteristic impedance (Z0) in the 90 to 150 Ω range. In some applications, it is desirable to have less than half this Z0. A properly configured four-conductor configuration allows us to achieve a low Z0. This technique is extendable to printed-wiring flexible-circuits (flex circui...