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The structure of Charm Jets in DIS |
| Reference |
A. Perieanu, presented at DIS 2005, Spring 2005
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| Document | Conference paper or talk |
| Figures |
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| Contact | A. Perieanu, J. Bracinik, G. Grindhammer |
| Abstract | The structure of charm jets in deep-inelastic scattering is studied with
the H1 detector at HERA using an integrated luminosity of 50 pb-1.
The event samples are in the phase space region 2 < Q^2 < 100 GeV^2 and
0.05 < y < 0.7. The charm events are tagged by a D*-meson required to have
a transverse momentum p_t,D* > 1.5 GeV and pseudorapidity |eta_D*| < 1.5.
Furthermore, the events are required to have at least one jet containing
the D*-meson (DstarJet). If there is a second jet (OtherJet) in the event,
it must have, like the DstarJet, p_t,jet > 1.5 GeV and |eta_jet| < 1.5.
The structure of the DstarJet and the OtherJet is investigated by
measuring the well-known jet shapes and subjet multiplicities as well as
the angular distribution of a specific subjet of the DstarJet and the
OtherJet with respect to its respective charm jet, defined to give a
correlation with a corresponding gluon at the parton level. The latter
distribution as well as the derived one of a characteristic angle
alpha_0 x E_jet as a function of E_jet is motivated by the suppression of
soft gluon radiation from heavy quarks, as expected from QCD ("dead cone effect"). In all
distributions differences between the DstarJet and the OtherJet are
observed. In general the data are found to be reasonably well described by
the QCD model for charm production as implemented in RAPGAP 2.8 and
JETSET 7.4. |
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