Study of the jet shape at 920 GeV/c in proton–nucleus interactions with HERA-B detector |
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Authors: | D Golubkov Y Golubkov |
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Institution: | (1) Moscow Physical Engineering Institute, 115409 Moscow, Russia;(2) Institute of Nuclear Physics of Moscow State University, 119899 Moscow, Russia |
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Abstract: | We performed a measurement of differential and integral jet shapes in proton-carbon, proton-tungsten and proton-aluminium
collisions at 920 GeV/c proton momentum with the HERA-B detector at HERA for the jet transverse energies in the range 4 GeV<ET(jet)< 12 GeV. Jets were identified using the kT-clustering algorithm. The measurements were performed for the hardest jet in the event, directed towards the opposite side
with respect to the trigger direction. Jets become narrower with increasing transverse energy and measured distributions agree
well with predictions of the PYTHIA 6.2 model. We do not observe any significant difference in the jet shape for the carbon
and the aluminium targets. Nevertheless, the transverse energy flow at small and large radii for the tungsten sample is slightly
less than for light nuclei. This observation indicates some influence of the nuclear environment on the formation of jets
in heavy nuclei, especially at lower transverse energies, 5 GeV<ET(jet)< 6 GeV.
PACS 13.85.-t; 13.87.-a; 13.87.Fh |
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