Measurement of charm fragmentation fractions in photoproduction at HERA
(2013) Journal of High Energy Physics (Print) — Vol. 2013, n° 9 (2013)
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- Abstract
- The production of D <sup>0</sup>, D <sup>*+</sup>, D <sup>+</sup>, D<inf>s</inf> <sup>+</sup> and Λ<inf>c</inf> <sup>+</sup> 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<sup>-1</sup>. 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 <inf>T</inf> > 3.8 GeV and pseudorapidity |η| < 1.6. The charm fragmentation fractions are compared to previous results from HERA and from e <sup>+</sup> e <sup>-</sup> experiments. The data support the hypothesis that fragmentation is independent of the production process. © 2013 SISSA.
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Abramowicz, H., Abt, I., Adamczyk, L., Adamus, M., Aggarwal, R., Antonelli, S., Antonioli, P., Antonov, A., Arneodo, M., Arslan, O., Aushev, V., Aushev, Y., Bachynska, O., Bamberger, A., Barakbaev, A. N., Barbagli, G., Bari, G., Barreiro, F., Bartosik, N., et al. (2013). Measurement of charm fragmentation fractions in photoproduction at HERA. Journal of High Energy Physics (Print), 2013(9). https://doi.org/10.1007/JHEP09(2013)058 (Original work published 2013)