| dc.description.abstract | According to calculation of quantum chromodynamics on the lattice, a phase transition
to a quark-gluon plasma occurs under the conditions of high energy density and
temperature. These conditions are reached in the ALICE experiment with high-energy
collisions of lead nuclei. The ALICE detectors, including the Inner Tracking System,
will be upgraded in 2019 - 2020. This research project studied D*+ reconstruction with
the upgraded ITS. To study the performance, the improvement of detecting D*+ mesons
with low pt and the expected significance of D*+ mesons for p-p collisions as well as for
Pb-Pb collisions is investigated. For both subjects a Monte-Carlo simulation program
PYTHIA is used to generate high-energy collision events. To study the acceptance of
D* + mesons with a low pt, a minimum pt of 40 MeV/c is used for the soft pion. To
calculate the significance, real data is used for estimating the background. The data to
calculate the background is produced in p-p collision at sqrt(sNN) = 13 TeV and Pb-Pb
collisions at sqrt(sNN) = 2,76 TeV.
58 percent of the D*+ mesons with a pt between the 0 and 0.5 GeV/c can be reconstructed,
and 90 percent or more for D*+ mesons with a pt higher than 0.5 GeV/c. The significance is calculated higher than 5 in all pt ranges up to 36 GeV/c, except for D*+ mesons with a pt lower than 0.5 GeV/c produced in Pb-Pb collisions. | |
