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

Abstract

The transverse structure of jets was studied via jet fragmentation transverse momentum ($j_{\mathrm{T}}$) 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 $3<p_{\mathrm{Tt}}<15$ GeV/$c$ 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.

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

References in corpus (9)

• PYTHIA 6.4 Physics and Manual
• An Introduction to PYTHIA 8.2
• Herwig++ Physics and Manual
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Interleaved Parton Showers and Tuning Prospects
• Antiangular Ordering of Gluon Radiation in QCD Media
• Jet Properties from Dihadron Correlations in p+p Collisions at sqrt(s)=200 GeV
• Transverse momentum dependence of inclusive primary charged-particle production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Cited by in corpus (7)

• Possible studies at the first stage of the NICA collider operation with polarized and unpolarized proton and deuteron beams
• Study of quark and gluon jet substructure in Z+jet and dijet events from pp collisions
• Measurement of charged hadron production in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=8$ TeV
• Measurement of isolated photon-hadron correlations in $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV pp and p-Pb collisions
• Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Jet-like correlations with respect to K${}_{\mathrm{S}}^0$ and $\Lambda$ ($\bar{\Lambda }$) in pp and central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Impact of inclusive hadron production data on nuclear gluon PDFs