158,760 research outputs found

    Decay of weak turbulence

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    Weak turbulence fields generated by single and multiple stage grids covering Reynolds numbers between 7 and 70 showing decay of energy spectr

    Ubiquitination accomplished: E1 and E2 enzymes were not necessary

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    Qiu et al. (2016) show that a mono-ADP-ribosyltransferase, SdeA, from Legionella pneumophila catalyzes ADP-ribosylation of ubiquitin, allowing SdeA to modify substrate with ubiquitin in the absence of E1 and E2 enzymes

    Semileptonic B(Bs,Bc)B(B_s, B_c) decays in the light-cone QCD sum rules

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    Semileptonic BB(Bs,BcB_s, B_c) decays are investigated systematically in the light-cone QCD sum rules. Special emphasis is put on the LCSR calculation on weak form factors with an adequate chiral current correlator, which turns out to be particularly effective to control the pollution by higher twist components of spectator mesons. The result for each channel depends on the distribution amplitude of the the producing meson. The leading twist distribution amplitudes of the related heavy mesons and charmonium are worked out by a model approach in the reasonable way. A practical scenario is suggested to understand the behavior of weak form factors in the whole kinematically accessible ranges. The decay widths and branching ratios are estimated for several BB(BcB_c) decay modes of current interest.Comment: 8 pages, talk given by the first arthur at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, Sept 24-28, 200

    Momentum Distribution for Bosons with Positive Scattering Length in a Trap

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    The coordinate-momentum double distribution function ρ(r,p)d3rd3p\rho ({\bf r}, {\bf p}) d^{3}rd^{3}p is calculated in the local density approximation for bosons with positive scattering length aa in a trap. The calculation is valid to the first order of aa. To clarify the meaning of the result, it is compared for a special case with the double distribution function ρwd3rd3p\rho_{w}d^{3} rd^{3}p of Wigner.Comment: Latex fil