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Correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions (1999)

Aitala, E. M. ; Amato, S. ; Anjos, J. C. ; [weitere]

Springer

EPJ direct 1 (1999), S. 1-67

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ISSN: 1435-3725

Schlagwort(e): 12.38.-t ; 13.85.-t ; 13.87.Ce ; 13.87.Fh

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We present a study of correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions, based on data from experiment E791 at Fermilab. We have fully reconstructed 791 ± 44 charm meson pairs to study correlations between the transverse and longitudinal momenta of the two D mesons and the relative production rates for different types of D meson pairs. We see slight correlations between the longitudinal momenta of the D and the $${\bar D}$$ , and significant correlations between the azimuthal angle of the D and the $${\bar D}$$ . The experimental distributions are compared to a next-to-leading-order QCD calculation and to predictions of the PYTHIA/JETSET Monte Carlo event generator. We observe less correlation between transverse momenta and different correlations between longitudinal momenta than these models predict for the default values of the model parameters. Better agreement between data and theory might be achieved by tuning the model parameters or by adding higher order perturbative terms, thus contributing to a better understanding of charm production. The relative production rates for the four sets of charm pairs, $$D^0{{\overline D}^0}, D^0 D^{-}, D^+{{\overline D}^0}, D^+ D^{-}$$ as calculated in the PYTHIA/JETSET event generator with the default parameters, agree with data as far as the relative ordering, but predict too many $$D^+ {{\overline D}^0}$$ pairs and too few $$D^+ D^{-}$$ pairs.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s101059900c0004

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Digitale Medien

Kinetics of polymerization of vinyl benzoate (1959)

Banerjee, S. ; Muthana, M. S.

Hoboken, NJ : Wiley-Blackwell

Journal of Polymer Science 37 (1959), S. 469-483

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ISSN: 0022-3832

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Vinyl benzoate was polymerized in bulk as well as in solution, using benzoyl peroxide and azobisisobutyronitrile initiator at a temperature of 79.6°C. The overall rate of polymerization was found to be proportional to the concentration of the monomer and to the square root of the initiator concentration. Polymerization progressed to a normal extent, except that it increased with conversion, probably because of transfer with polymer. The value of the transfer constants with the monomer, initiator, and some solvents are reported.

Zusätzliches Material: 10 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1959.1203713217

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Digitale Medien

Studies on copolymerization of vinyl benzoate (1959)

Banerjee, S. ; Muthana, M. S.

Hoboken, NJ : Wiley-Blackwell

Journal of Polymer Science 35 (1959), S. 292-295

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ISSN: 0022-3832

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1959.1203512832

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