D Meson Production in E+e− Annihilation PDF Download
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Author: Petros-Afentoulis Rapidis
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Category : Annihilation reactions
Languages : en
Pages : 228
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Book Description
Author: Petros-Afentoulis Rapidis
Publisher:
ISBN:
Category : Annihilation reactions
Languages : en
Pages : 228
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Book Description
Author: Petros-Afentoulis Rapidis
Publisher:
ISBN:
Category : Annihilation reactions
Languages : en
Pages : 206
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Book Description
![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.
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Languages : en
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Recent results on D* and D meson production at 29 GeV are presented from the DELCO, HRS, and MARK II collaborations at PEP.
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Languages : en
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Evidence is presented that a new particle, a narrow resonance of mass 1865 MeV/c2, and its associated excited state can be identified with the (D°, D/sup +/) and (D*°, D*/sup +/) doublets of charm theory. The D production in e−e/sup +/ annihilation and various properties of the decay modes are considered. 54 references. (JFP).
![Production and decay of the charged D* [D] meson in e_1hn+e_1hn- [ee] annihilation at 10 GeV centre of mass energy PDF](https://books.google.com/books/content/images/frontcover/9TExygAACAAJ?fife=w80-h100)
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Languages : de
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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.
![F meson production from e_1hn+e_1hn- [ee] annihilation in the Tasso detector PDF](https://books.google.com/books/content/images/frontcover/ARNZygAACAAJ?fife=w80-h100)
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Languages : de
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Author: Michael Parkinson
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Category : Mesons
Languages : en
Pages : 11
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Category :
Languages : en
Pages : 4
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