Peter Kapusta

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Resonant clock distributions have the potential to save power by recycling energy from cycle-to-cycle while at the same time improving performance by reducing the clock distribution latency and filtering out non-periodic noise. While these features have been successfully demonstrated in several small-scale experiments, there remained a number of concerns(More)
This article explains the basic principles of FLCS, a genuine fusion of Time-Correlated Single Photon Counting (TCSPC) and Fluorescence Correlation Spectroscopy (FCS), using common terms and minimum mathematics. The usefulness of the method is demonstrated on simple FCS experiments. The method makes possible to separate the autocorrelation function of(More)
The fluorescence of LDS 798 dye in aqueous solution has a very short lifetime of 24 ps, independent of excitation wavelength. The time response of common photon counting detectors depends on the wavelength of the registered photon. In lifetime measurements, the instrument response function (IRF) is usually approximated by the temporal profile of the(More)
We observe evidence for D(0)-D(0) mixing by measuring the difference in the apparent lifetime when a D(0) meson decays to the CP eigenstates K(+)K(-) and pi(+)pi(-) and when it decays to the final state K(-)pi(+). We find the relative difference of the lifetimes y(CP) to be [1.31+/-0.32(stat)+/-0.25(syst)]%, 3.2 standard deviations from zero. We also search(More)
We have measured the branching fraction of the inclusive radiative B meson decay B→Xsγ to be Br(B→Xsγ) = (3.36 ± 0.53(stat) ± 0.42(sys) −0.54(th))× 10. The result is based on a sample of 6.07 × 106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric e+e− storage ring. PACS: 13.40.Hq, 14.40.Nd, 14.65.Fy
Quantitative tests were performed in order to explore the practical limits of FLCS. We demonstrate that: a) FLCS yields precise and correct concentration values from as low as picomolar to micromolar concentrations; b) it is possible to separate four signal components in a single detector setup; c) diffusion times differing only 25% from each other can be(More)
We present a measurement of the standard model CP violation parameter sin2 phi(1) based on a 29.1 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is fully reconstructed as a J/psi K(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psi K(L), or J/psi K(*0) decay(More)
The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs in e(+)e(-) annihilation at a center-of-mass energy of 10.52(More)