Charmed Meson Production and Decay Properties at the Psi(3770). PDF Download
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Languages : en
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A remeasurement of the resonance near E/sub cm/ = 3.77 GeV in the ee− annihilation is presented. The properties of the resonance are used to deduce branching fractions of charmed mesons into hadronic final states. Several previously unseen decay modes are reported. Decays into Cabibbo suppressed final states are observed. The inclusive properties of D meson decays are studied, including strangeness and charged particle multiplicity. The semileptonic branching fractions for D° and D/sup -+/ are measured, providing a determination of the relative lifetimes of these particles.
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Languages : en
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Book Description
A remeasurement of the resonance near E/sub cm/ = 3.77 GeV in the ee− annihilation is presented. The properties of the resonance are used to deduce branching fractions of charmed mesons into hadronic final states. Several previously unseen decay modes are reported. Decays into Cabibbo suppressed final states are observed. The inclusive properties of D meson decays are studied, including strangeness and charged particle multiplicity. The semileptonic branching fractions for D° and D/sup -+/ are measured, providing a determination of the relative lifetimes of these particles.
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Languages : en
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Charmed meson production through two body processes in ee− annihilation is discussed. Evidence for states of charm excitation beyond the D* is obtained through an analysis of the recoil spectrum against D's produced at Ecm = 4.415 GeV. Direct observation of the reaction D* .-->. .pi.+D° in SPEAR data taken at Ecm exceeding 5 GeV is discussed. This reaction provides an extremely accurate determination of the D*+, D° mass difference (M/sub D*/sup +// -- M/sub D°/ = 145.3 +- 0.5 MeV/c2) and a new upper limit on D° -- anti D° mixing effects. The results of fits to the D°, D/sup +/ recoil spectrum are discussed. These fits provide considerable information on the masses, production mechanisms, and decays of charmed mesons. This is followed by a brief presentation of the known cross sections for charmed meson production and decay and an analysis of possible resonant structure in the decay products of the D° and D/sup +/. Lastly, a bubble chamber D° candidate submitted by Hagopian et al., of Florida State University is discussed.
![Charmed Meson Production and Decay Properties at the [psi] (3770) PDF](https://books.google.com/books/content/images/frontcover/cOtEAAAAIAAJ?fife=w80-h100)
Author: Rafe Schindler
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Category : Mesons
Languages : en
Pages : 458
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Author: Edward Charles Blucher
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Category : Mesons
Languages : en
Pages : 344
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![Charmed Meson Production by Ee- Annihilation. [Branching Ratios, Angular Distributions]. PDF](https://books.google.com/books/content/images/frontcover/URNoAQAACAAJ?fife=w80-h100)
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Languages : en
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Compelling evidence is presented for the production of the lying (D°, D) isodoublet of charmed mesons by ee− annihilation. A study of the recoil mass spectra against these mesons reveals the presence of more massive charmed states, the D*° and D*+, produced in association with the D isodoublet. Mass values and upper limits on the width of the D and D* are established, and the branching fractions for several D* decay modes are obtained. An analysis of the production and decay angular distributions shows that the D is probably a pseudoscalar state and the D* is probably a vector. Finally, upper limits are obtained for D°-antiD° mixing.
Author: Daryl DiBitonto
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Languages : en
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Languages : en
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Results on charmed meson production and decay are presented from the Mark III at SPEAR. F anti F* associated production is observed allowing a direct measurement of the F* mass. A search for the decay D .-->. .mu.nu/sub .mu./ in the recoil of hadronically tagged D/sup + -/ decays provides a stringent limit on the pseudoscalar decay constant f/sub D/. New results on D° anti D° mixing from semileptonic D° decays and evidence for a nonresonant component in D/sub e4/ decays are also presented.
Author: Petros-Afentoulis Rapidis
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Category : Annihilation reactions
Languages : en
Pages : 228
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Author: Leo Bellantoni
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Category :
Languages : en
Pages : 280
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Languages : en
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We report recent results on charmed meson decays, obtained using the Mark III detector at SPEAR. The first topic discussed is the observation of ee− .-->. D/sub s/D/sub s/* at .sqrt.s = 4.14 GeV. The D/sub s/* is detected as a peak in the mass distribution recoiling from D/sub s//sup + -/ .-->. phi.pi./sup + -/. The mass of the D/sub s/* is found to be (2109.3 +- 2.1 +- 3.1)MeV/c2, yielding a D/sub s/*-D/sub s/ mass difference of (137.9 +- 2.1 +- 4.3) MeV/c2. The production cross section times branching ratio is also measured. Next, a search for the decay D .-->. .mu.+nu/sub .mu./ is described. A preliminary upper limit (90% CL) on B(D+ .-->. .mu.+nu/sub .mu./) of 8.4 x 10−4 is obtained, corresponding to an upper limit on the decay constant f/sub D/ of 340 MeV/c2. Finally, we present results of a search for the lepton family number violating decay D° .-->. .mu.e. We find B(D° .-->. .mu.e)
