824 research outputs found

    B Physics at CDF

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    Due to the large b-bbar cross section at 1.96 TeV p-pbar collisions, the Tevatron is currently the most copious source of B hadrons. Recent detector upgrades for Run II have made these more accessible, allowing for a wide range of B and CP violation physics with B hadrons of all flavours. In this paper we present B-physics results, and, using the versatile hadronic Two Track Trigger, a search for Xi(1860), from up to 240/pb of data.Comment: To appear in the proceedings of 39th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Aosta Valley, Italy, 21-28 March 200

    Reduction of Statistical Power Per Event Due to Upper Lifetime Cuts in Lifetime Measurements

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    A cut on the maximum lifetime in a lifetime fit not only reduces the number of events, but also, in some circumstances dramatically, decreases the statistical significance of each event. The upper impact parameter cut in the hadronic B trigger at CDF, which is due to technical limitations, has the same effect. In this note we describe and quantify the consequences of such a cut on lifetime measurements. We find that even moderate upper lifetime cuts, leaving event numbers nearly unchanged, can dramatically increase the statistical uncertainty of the fit result.Comment: Changes to latest revision: added DOI link, took the opportunity to correct some minor typos added one small clarificatio

    Heavy Flavour Lifetimes and Lifetime Differences

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    We give an overview of heavy flavour lifetime measurements, focusing on recent results from the Tevatron and the B factories.Comment: Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052). 8 pages LaTeX, 12 figure

    Charm (and Beauty) Production at the Tevatron

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    We present recent results on heavy flavour production at Tevatron Run II for typically ~1/fb of analysed proton-antiproton data at a c.m. energy of 1.96 TeV. This includes results on single and correlated open charm and bottom cross sections, charm pair production kinematics, J/psi, psi(2S) and chi cross sections and polarisation measurements in J/psi, psi(2S), Upsilon(1S), and Upsilon(2S).Comment: To be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C07080

    An Exact Formula to Describe the Amplification Process in a Photomultiplier Tube

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    An analytical function is derived that exactly describes the amplification process due to a series of discrete, Poisson-like amplifications like those in a photo multiplier tube (PMT). A numerical recipe is provided that implements this function as a computer program. It is shown how the program can be used as the core-element of a faster, simplified routine to fit PMT spectra with high efficiency. The functionality of the method is demonstrated by fitting both, Monte Carlo generated and measured PMT spectra.Comment: 12 pages, 5 figures, with cut-and-paste FORTRAN implementatio

    Review of Multibody Charm Analyses

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    Model-independent determination of the strong phase difference between D0D^0 and Dˉ0π+ππ+π\bar{D}^0 \to\pi^+\pi^-\pi^+\pi^- amplitudes

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    For the first time, the strong phase difference between D0D^0 and Dˉ0π+ππ+π\bar{D}^0\to\pi^+\pi^-\pi^+\pi^- amplitudes is determined in bins of the decay phase space. The measurement uses 818pb1818\,\mathrm{pb}^{-1} of e+ee^+e^- collision data that is taken at the ψ(3770)\psi(3770) resonance and collected by the CLEO-c experiment. The measurement is important for the determination of the CPC P-violating phase γ\gamma in B±DK±B^{\pm}\to D K^{\pm} (and similar) decays , where the DD meson (which represents a superposition of D0D^0 and Dˉ0\bar{D}^0) subsequently decays to π+ππ+π\pi^+\pi^-\pi^+\pi^-. To obtain optimal sensitivity to γ\gamma, the phase space of the Dπ+ππ+πD \to \pi^+\pi^-\pi^+\pi^- decay is divided into bins based on a recent amplitude model of the decay. Although an amplitude model is used to define the bins, the measurements obtained are model-independent. The CPCP-even fraction of the Dπ+ππ+πD \to \pi^+\pi^-\pi^+\pi^- decay is determined to be F+4π=0.769±0.021±0.010F_{+}^{4\pi} = 0.769 \pm 0.021 \pm 0.010, where the uncertainties are statistical and systematic, respectively. Using simulated B±DK±,Dπ+ππ+πB^{\pm}\to D K^{\pm}, D \to \pi^+\pi^-\pi^+\pi^- decays, it is estimated that by the end of the current LHC run, the LHCb experiment could determine γ\gamma from this decay mode with an uncertainty of (±10±7)(\pm10\pm7)^\circ, where the first uncertainty is statistical based on estimated LHCb event yields, and the second is due to the uncertainties on the parameters determined in this paper
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