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Analysis of gluon and charm jets in charm events |
| Reference |
Preliminary results expected for DIS2005, Spring 2005 |
| Figures |
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| Contact |
M. Martisikova |
| Abstract |
A measurement of the cross section of gluon and charmed jets in
tagged charm events is performed in the photoproduction kinematic
regime in ep collisions at HERA.
The data were collected in the years 1999 and 2000
at a centre-of-mass energy of 318 GeV
and correspond to an integrated luminosity of 48 pb^-1.
Events are selected by requiring two jets with pt>7(6) GeV in the
central rapidity range. One of the jets is tagged by a high
transverse-momentum muon and charm quark production is enriched using
signatures based on the different lifetimes and masses of charm, beauty
and the light quarks.
The structure of the other jet is investigated. Parameters
exploiting the different properties of gluon and
charm jets are used to determine differential cross sections as a
function
of eta and x_gamma. Results are compared to predictions of QCD
calculation. |
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