Table of contents and editorial information for Vol. 20, no. 2, Spring 1993

Table of contents and editorial information for Vol. 20, no. 2, Spring 199

Table of contents and introductory materials for Vol. 20, no. 2, 2012

This content includes the table of contents and editorial information for vol.20, issue 2 (Fall, 2012

Heavy-Light Meson Decay Constant from QCD Sum Rules in Three-Loop Approximation

In this paper we compute the decay constant of the pseudo-scalar heavy-light mesons in the heavy quark effective theory framework of QCD sum rules. In our analysis we include the recently evaluated three-loop result of order $\alpha_s^2$ for the heavy-light current correlator. The value of the bottom quark mass, which essentially limits the accuracy of the sum rules for $B$ meson, is extracted from the nonrelativistic sum rules for $\Upsilon$ resonances in the next-to-next-to-leading approximation. We find stability of our result with respect to all types of corrections and the specific form of the sum rule which reduces the uncertainty. Our results $f_B=206\pm 20$ MeV and $f_D=195\pm 20$ MeV for the $B$ and $D$ meson decay constants are in impressive agreement with recent lattice calculations.Comment: minor editorial changes, references added, to appear in PR

Production of long-lived atomic vapor inside high-density buffer gas

Atomic vapor of four different paramagnetic species: gold, silver, lithium, and rubidium, is produced and studied inside several buffer gases: helium, nitrogen, neon, and argon. The paramagnetic atoms are injected into the buffer gas using laser ablation. Wires with diameters 25 $\mu$m, 50 $\mu$m, and 100 $\mu$m are used as ablation targets for gold and silver, bulk targets are used for lithium and rubidium. The buffer gas cools and confines the ablated atoms, slowing down their transport to the cell walls. Buffer gas temperatures between 20 K and 295 K, and densities between $10^{16}$ cm$^{-3}$ and $2\times10^{19}$ cm$^{-3}$ are explored. Peak paramagnetic atom densities of $10^{11}$ cm$^{-3}$ are routinely achieved. The longest observed paramagnetic vapor density decay times are 110 ms for silver at 20 K and 4 ms for lithium at 32 K. The candidates for the principal paramagnetic-atom loss mechanism are impurities in the buffer gas, dimer formation and atom loss on sputtered clusters.Comment: Some minor editorial changes and corrections, added reference

Editorial

Editorial - Vol. 20, N° 1 (2012) Editorial - Vol. 20, N° 2 (2012

WHOLE ISSUE \u3ci\u3eNebraska Bird Review\u3c/i\u3e (April 1954) 22(2)

TABLE OF CONTENTS Birds of Prairie Island ...................18 A Reply To: When the Bird Watcher Reads ...................20 The Avocet in Nebraska ...................22 Editorial-How Well Do We Know the Birds of Nebraska? ...................26 General Notes................... 27 Communications ...................28 Book Reviews ...................2

WHOLE ISSUE \u3ci\u3eNebraska Bird Review\u3c/i\u3e (April 1954) 22(2)

TABLE OF CONTENTS Birds of Prairie Island ...................18 A Reply To: When the Bird Watcher Reads ...................20 The Avocet in Nebraska ...................22 Editorial-How Well Do We Know the Birds of Nebraska? ...................26 General Notes................... 27 Communications ...................28 Book Reviews ...................2