Messung des D*-Meson-Produktionsquerschnitts in tiefinelastischer Streuung mit dem H1-Experiment
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Date
2007-06-12T06:20:00Z
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Abstract
A cross-section measurement of the production of D* mesons in deep inelastic scattering
at a centre-of-mass energy of 319 GeV is presented. The explored kinematic region
extends in momentum transfer squared from 5 GeV2 to 100 GeV2 and in inelasticity
0.05 < y < 0.6. D* mesons are detected above a minimal transverse momentum of
1.5 GeV and in the pseudorapidity range |η| < 1.5.
The analysed data were recorded in the year 2004-2006 after the upgrade of the
HERA accelerator corresponding to an integrated luminosity of 222 pb−1, which is
four times more statistics in comparison to the previous H1 measurement. The higher
statistics facilitates a better understanding of the sources of systematic errors. Among
other things, this leads to a better description of the signal shape and therefore to
a smaller systematic error for the signal extraction. Furthermore, due to the higher
statistics the single and double differential productions cross section can be investigated
using a finer granularity. The production cross sections are compared to the
next-to-leading order calculation HVQDIS and the leading order Monte Carlo generators
RAPGAP and CASCADE. In general both the Monte Carlo generators and the
HVQDIS calculation are able to describe the measurement. However, the decription by
the HVQDIS calculation is not as good as by the Monte Carlo predictions, in particular
revealing a small discrepancy in the pseudorapidity distribution at η > 0.5.
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Keywords
DIS, H1, D*-Meson, Tiefinelastische Streuung, Heavy Flavour, Deep inelastic scattering