The production of D-0, D*(+), D+, D-s(+) and Lambda(+)(c) charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb(-1). The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, the fraction of charged D mesons produced in a vector state, and the stangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum p T > 3.8GeV and pseudorapidity vertical bar eta vertical bar < 1.6. The charm fragmentation fractions are compared to previous results from HERA and from e(+)e(-) experiments. The data support the hypothesis that fragmentation is independent of the production process.
Measurement of charm fragmentation fractions in photoproduction at HERA
BRUGNERA, RICCARDO;CARLIN, ROBERTO;GARFAGNINI, ALBERTO;A. Longhin;
2013
Abstract
The production of D-0, D*(+), D+, D-s(+) and Lambda(+)(c) charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb(-1). The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, the fraction of charged D mesons produced in a vector state, and the stangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum p T > 3.8GeV and pseudorapidity vertical bar eta vertical bar < 1.6. The charm fragmentation fractions are compared to previous results from HERA and from e(+)e(-) experiments. The data support the hypothesis that fragmentation is independent of the production process.Pubblicazioni consigliate
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