Production of Eta Mesons in Ee− Annihilations At. Sqrt. S PDF Download
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Data from ee− annihilations at 29 GeV have been used to measure the production and fragmentation of eta mesons. The signal is observed in the eta .-->. .gamma gamma. decay channel. The fragmentation function for p/sub eta/> 1.5 GeV/c agrees well with the shapes predicted by both the Lund and Webber models. However, the mean multiplicity is measured to be = 0.37 +- 0.08 eta mesons per hadronic annihilation event, which is significantly lower than the values predicted by either model. 6 refs., 2 figs., 1 tab.
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Data from ee− annihilations at 29 GeV have been used to measure the production and fragmentation of eta mesons. The signal is observed in the eta .-->. .gamma gamma. decay channel. The fragmentation function for p/sub eta/> 1.5 GeV/c agrees well with the shapes predicted by both the Lund and Webber models. However, the mean multiplicity is measured to be = 0.37 +- 0.08 eta mesons per hadronic annihilation event, which is significantly lower than the values predicted by either model. 6 refs., 2 figs., 1 tab.
![Measurement of [pi]0 and [eta] Meson Production in E+e- Annihilation at [square Root of S] Near 10 GeV PDF](https://books.google.com/books/content/images/frontcover/BgInGwAACAAJ?fife=w80-h100)
Author: CRYSTAL BALL Collaboration
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Languages : en
Pages : 10
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Languages : en
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This thesis describes the measurement of multiplicities and differential cross-sections of the [rho]°, K*°, and [phi] in ee− annihilation at .sqrt.s = 29 GeV, using data collected by the TPC/2.gamma. Detector Facility at PEP. The number of vector mesons per event is determined to be N(/rho/°) = 0.77 +- 0.08 +- 0.15, N(K*° + /bar K/*°) = 0.58 +- 0.05 +- 0.11, and N(/phi/) = 0.076 +- 0.010 +- 0.012. These multiplicities are used to find that the ratio of strange quarks to up quarks produced in the hadronization process is 0.30 +- 0.07, and that the ratio of light vector mesons to all light mesons produced in the hadronization process is 0.45 +- 0.08. All results agree with previous measurements. Measurements are compared with predictions of the Lund and Webber hadronization models, neither model is particularly favored nor disfavored. 60 refs., 32 figs., 24 tabs.
Author: Petros-Afentoulis Rapidis
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Category : Annihilation reactions
Languages : en
Pages : 228
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Languages : en
Pages : 11
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Author: Petros-Afentoulis Rapidis
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Category : Annihilation reactions
Languages : en
Pages : 206
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![Inclusive Production of Vector Mesons in E+e± Annihilation at [square Root Sign] S PDF](https://books.google.com/books/content/images/frontcover/fClPAQAAMAAJ?fife=w80-h100)
Author: Timothy Kent Edberg
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Category : Annihilation reactions
Languages : en
Pages : 364
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![Production and Decay of Charmed Mesons in E+e- Annihilation at [square Root] S> 28 GeV PDF](https://books.google.com/books/content/images/frontcover/GKUhGwAACAAJ?fife=w80-h100)
Author: TASSO Collaboration
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Languages : en
Pages : 14
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![D Meson Production in Ee− Annihilation. [3. 7 to 7. 0 GeV, Total Cross Section, Branching Ratio]. PDF](https://books.google.com/books/content/images/frontcover/jxmsAQAACAAJ?fife=w80-h100)
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Languages : en
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The production of D mesons in ee− annihilation for the center-of-mass energy range 3.7 to 7.0 GeV was studied with the MARK I magnetic detector at SPEAR. A resonance was observed in the total cross section for hadron production in ee− annihilation at an energy just above the threshold for charm production. This resonance, which is named psi'', has a mass of 3772 +- 6 MeV/c2, a total width of 28 +- 5 MeV/c2, a partial width to electron pairs of 345 +- 85 eV/c2, and decays almost exclusively into D anti D pairs. The psi'' provides a rich source of background-free and kinematically well defined D mesons for study. From produced in the decay of the psi'' the masses of the D° and D/sup +/ mesons were determined to be 1863.3 +- 0.9 MeV/c2 and 1868.3 +- 0.9 MeV/c2 respectively. Also the branching fractions for D° decay to K−.pi./sup +/, anti K°.pi./sup +/.pi.− and K−.pi./sup +/.pi.−.pi./sup +/ were determined to be (2.2 +- 0.6)%, (4.0 +- 1.3)%, and (3.2 +- 1.1)% and the branching fractions for D/sup +/ decay to anti K°.pi./sup +/ and K−.pi./sup +/.pi./sup +/ to be (1.5 +- 0.60)% and (3.9 +- 1.0)%. The average number of kaons per D decay was found to be 0.52 +- 0.14 K°'s and 0.42 +- 0.12 K/sup +/'s. The rate for inclusive production of D mesons at center-of-mass energies above the psi'' was measured; it is found that it can account for most, if not all, of the observed increase in the total hadronic cross-section for center-of-mass energies above 4 GeV. The inclusive momentum and energy spectra for D's were measured at the highest available center-of-mass energy (7 GeV). The energy spectra are rapidly decreasing functions of energy with a slope similar to the slope of the charged pion spectrum at the same center-of-mass energy. This behavior suggests that the fragmentation function of the charmed quark into charmed mesons is a decreasing function of the scaling variable z = 2E/sub D//E/sub CM/. 81 references.
![Inclusive Production of Vector Mesons [rho]0 and K[superscript *±] in E+e- Annihilation at [square Root of S] PDF](https://books.google.com/books/content/images/frontcover/U_quzQEACAAJ?fife=w80-h100)
Author: Deutsches Elektronen-Synchrotron (Center). JADE Collaboration
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Languages : en
Pages : 9
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