13 research outputs found

    Velocity autocorrelation function of a Brownian particle

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    In this article, we present molecular dynamics study of the velocity autocorrelation function (VACF) of a Brownian particle. We compare the results of the simulation with the exact analytic predictions for a compressible fluid from [6] and an approximate result combining the predictions from hydrodynamics at short and long times. The physical quantities which determine the decay were determined from separate bulk simulations of the Lennard-Jones fluid at the same thermodynamic state point.We observe that the long-time regime of the VACF compares well the predictions from the macroscopic hydrodynamics, but the intermediate decay is sensitive to the viscoelastic nature of the solvent.Comment: 7 pages, 6 figure

    The Physics of the B Factories

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    The BaBar detector: Upgrades, operation and performance

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    Contains fulltext : 121729.pdf (preprint version ) (Open Access

    The development of international-management knowledge in the German-Speaking countries

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    Measurement of B0→Ds(*)+D*- branching fractions and B0→Ds*+D*- polarization with a partial reconstruction technique

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    We present a study of the decays B0→Ds(*)+D*-, using 20.8 fb-1 of e+e- annihilation data recorded with the BABAR detector. The analysis is conducted with a partial reconstruction technique, in which only the Ds(*)+ and the soft pion from the D*- decay are reconstructed. We measure the branching fractions B(B0→Ds+D*-)=(1.03±0.14±0.13±0.26)% and B(B0→Ds*+D*-)=(1.97±0.15±0.30±0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the Ds+→φπ+ branching fraction uncertainty. From the B0→Ds*+D*- angular distributions, we measure the fraction of longitudinal polarization ΓL/Γ=(51.9±5.0±2.8)%, which is consistent with theoretical predictions based on factorization

    Measurement of the branching fraction for B- --> D0 K*-

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    We present a measurement of the branching fraction for the decay B -\u2192K0*- using a sample of approximately 86 7106 BB\u304 pairs collected by the BABAR detector from e+e- collisions near the \u3b3(4S) resonance. The D0 is detected through its decays to K -\u3c0+, K-\u3c0+\u3c00, and K- \u3c0+ \u3c0- \u3c0+, and the K*- through its decay to KS0\u3c0 -. We measure the branching fraction to be B(B -\u2192D0K*-) = [6.3\ub10.7(stat) \ub10.5(syst)] 710-4

    Measurement of the Branching Fractions and CP Asymmetry of B-→D(CP)0K- Decays with the BABAR Detector

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    The measurement of R, Rcp+, and Acp+ were presented. B- → D° K-decays with D° mesons decaying to non-CP and CP-even eigenstates were reconstructed. It was observed that the charged-particle tracking was provided by a five-layer silicon vertex tracker (SVT). It was shown that the parametrization of the particle identication PDF was performed by fitting with a Gaussian distribution
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