TY - JOUR
T1 - Jet fragmentation transverse momentum measurements from di-hadron correlations in √s = 7 TeV pp and √sNN = 5.02 TeV p–Pb collisions
AU - ALICE Collaboration
AU - Acharya, S.
AU - Andrews, H. A.
AU - Evans, D.
AU - Graham, Kay
AU - Jevons, Oliver
AU - Jones, Peter
AU - Jusko, Anton
AU - Krivda, Marian
AU - Kvapil, Jakub
AU - Lietava, Roman
AU - Villalobos Baillie, Orlando
AU - Willsher, Emily
AU - Zardoshti, Nima
PY - 2019/3/26
Y1 - 2019/3/26
N2 - The transverse structure of jets was studied via jet fragmentation transverse momentum (jT) 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 <pTt <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 s=7$$ \sqrt{s}=7 $$TeV and in p–Pb collisions at sNN=5.02$$ \sqrt{s_{\mathrm{NN}}}=5.02 $$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.
AB - The transverse structure of jets was studied via jet fragmentation transverse momentum (jT) 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 <pTt <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 s=7$$ \sqrt{s}=7 $$TeV and in p–Pb collisions at sNN=5.02$$ \sqrt{s_{\mathrm{NN}}}=5.02 $$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.
KW - Hadron-Hadron scattering (experiments)
UR - http://www.scopus.com/inward/record.url?scp=85063688537&partnerID=8YFLogxK
U2 - 10.1007/JHEP03(2019)169
DO - 10.1007/JHEP03(2019)169
M3 - Article
SN - 1029-8479
VL - 2019
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 3
M1 - 169
ER -