D* and D Meson Production in Ee− Annihilation at 29 GeV. PDF Download
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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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Recent results on D* and D meson production at 29 GeV are presented from the DELCO, HRS, and MARK II collaborations at PEP.
Author: Petros-Afentoulis Rapidis
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Category : Annihilation reactions
Languages : en
Pages : 228
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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.
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Languages : en
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Recent results from HRS on the production of scalar, tensor, and charm mesons and of strange and charm baryons in ee− annihilation are presented. The production of f0(975), f2(1270), and K2*(1430) is shown briefly. The decays of D*(2010) and D*(2007)° are studied in detail. The production of .xi.− and .sigma.(1385)/sup + -/ is mentioned. Finally, the preliminary analyses of .lambda./sub c/ and .sigma./sub c//sup 0,++/ productions are presented.
Author: Steven Oscar Melnikoff
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Category : Hadron interactions
Languages : en
Pages : 244
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![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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D* production is studied in the decay chain D* .-->. D° .pi. with the D° observed in the K−.pi.+ mode and the corresponding charge conjugate decays. The results were obtained from a preliminary analysis of an 80 pb−1 data sample of e+e− annihilations at 29 GeV taken with the High Resolution Spectrometer at PEP. The excellent mass resolution of the HRS allows the study of the D* production and decay with very low background. We present the fragmentation function over the range of Z from 0.2 to 1.0.
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The Mark II detector is used to measure the inclusive production rates for K°, K/sup + -/, rho°, K*° and K*/sup + -/ in a sample of 59,489 hadronic events produced in ee− annihilation at 29 GeV. The inclusive rates for rho° and K*° + anti K*° production for momenta greater than 1 GeV/c are found to be 0.44 +- 0.04 +- 0.06 per event and 0.42 +- 0.05 +- 0.08 per event respectively. The rate for K*/sup + -/ production for momenta greater than 2 GeV/c is found to be 0.26 +- 0.05 +- 0.06 per event. The rate for K° + anti K° production over the full momentum range is found to be 1.27 + 0.03 +- 0.15 per event. The differential production rates for K°, rho° and K*/sup + -/ are, in addition, determined as a function of the particle energy. The inclusive rate for K/sup + -/ is also measured for K/sup + -/ momenta less than 900 MeV/c and is found to be 1.31 +- 0.09 +- 0.19 times the K° + anti K° rate in the same momentum region. These production rates are used to determine the particle content of hadronic events at 29 GeV and are compared to the rates predicted by theoretical models of parton fragmentation. 31 references.
Author: Petros-Afentoulis Rapidis
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Category : Annihilation reactions
Languages : en
Pages : 206
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![Evidence for F* [F] meson production in e_1hn+e_1hn- [ee] annihilation at 10 GeV center-of-mass energy PDF](https://books.google.com/books/content/images/frontcover/0hfPXwAACAAJ?fife=w80-h100)
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Languages : de
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