Jet transverse fragmentation momentum from h-h correlations in pp and p-Pb collisions
QCD color coherence phenomena, like angular ordering, can be studied by looking at jet fragmentation. As the jet is fragmenting, it is expected to go through two different phases. First, there is QCD branching that is calculable in perturbative QCD. Next, the produced partons hadronize in a non-pert...
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Zusammenfassung: | QCD color coherence phenomena, like angular ordering, can be studied by
looking at jet fragmentation. As the jet is fragmenting, it is expected to go
through two different phases. First, there is QCD branching that is calculable
in perturbative QCD. Next, the produced partons hadronize in a non-perturbative
way later in a hadronization process. The jet fragmentation can be studied
using the method of two particle correlations. A useful observable is the jet
transverse fragmentation momentum $j_{\mathrm{T}}$, which describes the angular
width of the jet. In this contribution, a differential study will be presented
in which separate $j_{\mathrm{T}}$ components for branching and hadronization
will be distinguished from the data measured by the ALICE experiment. The
$p_{\mathrm{Tt}}$ dependence of the hadronization component
$\sqrt{\left}$ is found to be rather flat, which is
consistent with universal hadronization assumption. However, the branching
component shows slightly rising trend in $p_{\mathrm{Tt}}$. The $\sqrt{s} =
7\,\mathrm{TeV}$ pp and $\sqrt{s_{\mathrm{NN}}} = 5.02\,\mathrm{TeV}$ p-Pb data
give the same results within error bars, suggesting that this observable is not
affected by cold nuclear matter effects in p-Pb collisions. The measured data
will also be compared to the results obtained from PYTHIA8 simulations. |
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DOI: | 10.48550/arxiv.1612.05475 |