The use of charge conjugate reactions is implied throughout the paper.

Lasers have long played a critical role in the advancement of aerosol science. A new regime of ultrafast laser technology has recently be realized, the world's first soft x-ray free electron laser. The Free electron LASer in Hamburg, FLASH, user facility produces a steady source of 10 femtosecond pulses of 7-32 nm x-rays with 10 12 photons per pulse. The high brightness, short wavelength, and high repetition rate (>500 pulses per second) of this laser offers unique capabilities for aerosol characterization. Here we use FLASH to perform the highest resolution imaging of single PM2.5 aerosol particles in flight to date. We resolve to 35 nm the morphology of Address correspondence to Michael J. Bogan, Stanford PULSE Institute for Ultrafast Energy Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road MS59, Menlo Park, CA 94025, USA. E-mail: mbogan@slac.stanford.edu fibrous and aggregated spherical carbonaceous nanoparticles that existed for less than two milliseconds in vacuum. Our result opens the possibility for high spatial-and time-resolved single particle aerosol dynamics studies, filling a critical technological need in aerosol science.

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We present a preliminary measurement of CP-violating asymmetries in fully reconstructed B 0 →D (*)± π ∓ and B 0 →D ± ρ ∓ decays in approximately 110 million Υ (4S) → BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a maximum likelihood fit to the time-dependent decay distributions we obtain for the CP-violating parameters: a Dπ = −0.032 ± 0.031 (stat.) ± 0.020 (syst.), c Dπ lep = −0.059 ± 0.055 (stat.) ± 0.033 (syst.) on the B 0 →D ± π ∓ sample, a D * π = −0.049 ± 0.031 (stat.) ± 0.020 (syst.), c D * π lep = +0.044 ± 0.054 (stat.) ± 0.033 (syst.) on the B 0 →D * ± π ∓ sample, and a Dρ = −0.005 ± 0.044 (stat.) ± 0.021 (syst.), c Dρ lep = −0.147 ± 0.074 (stat.) ± 0.035 (syst.) on the B 0 →D ± ρ ∓ sample.