Improved Measurement of Inclusive Radiative B-meson decays

Abstract

We report a fully inclusive measurement of the flavor changing neutral current decay $B\to X_s\gamma$ in the energy range $1.7 \GeV\le E^\mathrm{c.m.s}_\gamma\le 2.8 \GeV$, covering 97% of the total spectrum, where c.m.s is the center of mass system. Using $605\ifb$ of data, we obtain in the rest frame of the $B$-meson ${\mathcal B}(B\to X_s\gamma : E^B_\gamma>1.7 \mathrm{GeV})= (3.31 \pm 0.19 \pm 0.37 \pm 0.01)\times 10^{-4}$, where the errors are statistical, systematic and from the boost correction needed to transform from the rest frame of the $\Upsilon(4S)$ (c.m.s) to that of the $B$-meson, respectively. We also measure the first and second moments of the photon energy spectrum as functions of various energy thresholds, which extend down to $1.7 \GeV$. The results are preliminary.Comment: 10 pages, 11 figure

Analysis of Aging Products from Biofuels in Long-Term Storage

“…Even though biofuels were introduced several years ago, their aging behavior is still thoroughly discussed up to this day . FAME blends are known to have lower oxidation stability than pure fossil heating oil and, thus, require additives for stabilization. , During extended storage or under the impact of heat, irradiation, or friction, oxidation reactions lead to various oxygenated products and oligomers. − Depending on the FAME concentration, these products form sediments. , In addition to being complex natural products themselves, FAME fuels and blends also contain a multitude of contaminants, which participate in the sedimentation process. , Moreover, the relation between sediment formation and FAME content is not linear owing to the sediment’s solubility . Higher FAME concentrations can keep oxidation products dissolved, but the polarity is insufficient in lower concentrated FAME blends.…”