Jet fragmentation transverse momentum measurements from di-hadron correlations in $\sqrt{s}$ = 7 TeV pp and $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV p-Pb collisions - INSPIRE

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Jet fragmentation transverse momentum measurements from di-hadron correlations in $\sqrt{s}$ = 7 TeV pp and $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV p-Pb collisions

ALICE

Collaboration

Nov 23, 2018

21 pages

Published in:

JHEP 03 (2019) 169

Published: Mar 26, 2019

e-Print:

1811.09742 [nucl-ex]

DOI:

10.1007/JHEP03(2019)169

Report number:

CERN-EP-2018-303

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

The transverse structure of jets was studied via jet fragmentation transverse momentum (j

_{T}

) distributions, obtained using two-particle correlations in proton-proton and proton-lead collisions, measured with the ALICE experiment at the LHC. The highest transverse momentum particle in each event is used as the trigger particle and the region 3 < p

_{Tt}

< 15GeV/c is explored in this study. The measured distributions show a clear narrow Gaussian component and a wide non-Gaussian one. Based on Pythia simulations, the narrow component can be related to non-perturbative hadronization and the wide component to quantum chromodynamical splitting. The width of the narrow component shows a weak dependence on the transverse momentum of the trigger particle, in agreement with the expectation of universality of the hadronization process. On the other hand, the width of the wide component shows a rising trend suggesting increased branching for higher transverse momentum. The results obtained in pp collisions at

\sqrt{s}=7

TeV and in p–Pb collisions at

\sqrt{s_{\mathrm{NN}}}=5.02

TeV are compatible within uncertainties and hence no significant cold nuclear matter effects are observed. The results are compared to previous measurements from CCOR and PHENIX as well as to Pythia 8 and Herwig 7 simulations.

Note:

21 pages, 1 captioned table, 8 figures, authors from page 16, published version, figures at http://alice-publications.web.cern.ch/node/4750

Hadron-Hadron scattering (experiments)
jet: fragmentation
transverse momentum: high
hadron hadron: correlation
hadron hadron: scattering
correlation: two-particle
nuclear matter: effect
p p: scattering
hadronization
nonperturbative

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