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Study of Jet Shapes in Charm Photoproduction at HERA |
| Reference |
M. Martisikova, presented at DIS 2005, Spring 2005
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| Document | Conference paper or talk |
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| Contact | M. Martisikova |
| Abstract | Charm dijet events are investigated in the photoproduction kinematic range
in $ep$ collisions at HERA. The data were collected with the H1 Experiment
in the years 1999-2000 at a centre-of-mass energy of 318 GeV and correspond to an
integrated luminosity of 48 pb-1. One jet is tagged by a muon
as being initiated by a charm quark.
In order to shed light on the production mechanism of charm events in $ep$
collisions the shape of the other jet is studied
to distinguish if it is initiated by a quark or a gluon.
The jet shapes are measured as function of kinematic variables
such as the transverse momentum, energy and pseudorapidity of the
jet and the quantity x_\gamma^{obs}.
The shapes are found to be well described by the leading order
plus parton shower Monte Carlo simulation PYTHIA in the region of
large x_\gamma^{obs}, where according to the simulation
the jets are dominantly charm quark initiated.
Deviations between data and PYTHIA are observed
for small x_\gamma^{obs}, where resolved photon
events are expected to contribute significantly and more gluon jets are
expected.
No such deviations are observed in a dijet photoproduction
sample without muon requirements,
which is dominated by light quark production. |
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