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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2812482
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 37
  • ???jsp.display-item.citation.isi??? 39
social impact