Two particle differential transverse momentum and number density correlations in p-Pb and Pb-Pb at the LHC - INSPIRE

DataBETA

Two particle differential transverse momentum and number density correlations in p-Pb and Pb-Pb at the LHC

ALICE

Collaboration

May 11, 2018

59 pages

Published in:

Phys.Rev.C 100 (2019) 4, 044903

Published: Oct 11, 2019

e-Print:

1805.04422 [nucl-ex]

DOI:

10.1103/PhysRevC.100.044903

Report number:

CERN-EP-2018-118

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Goethe U., Frankfurt (main))

The production cross section and the transverse momentum distribution of charged particles is measured in pp collisions at √s = 2.76 TeV, 5.02 TeV, 7 TeV and 13 TeV, as well as for Pb-Pb collision at √s_NN = 5.02 TeV and Xe-Xe at √s_NN = 5.44 TeV in ALICE at the LHC. The measurement is performed in the transverse momentum region of 0.15 < p_T < 50 GeV/c and in the pseudorapidity range of |η| < 0.8. The precision of the measurement has been substantially enhanced as a result of the improved corrections, by taking into account a more realistic particle composition in the MC simulations. As a result, the systematic uncertainties have been reduced by more than a factor two in all systems and energies.The average transverse momentum results show a faster-than-linear increase with the center-of-mass energy and follow a similar trend with respect to previous measurements. The analysis of the p_T spectra in multiplicity intervals show a weak center-of-mass energy dependence when they are compared to their respective inelastic (INEL) pp measurement. The average multiplicity as a function of the collision energy shows a quadratic trend, and the comparison with other ALICE multiplicity measurements exhibits a remarkable agreement, within uncertainties.The transverse momentum spectra in pp collisions are compared to state-of-the-art MC simulations, EPOS LHC and PYTHIA 8 event generators; none of them is able to reproduce the distributions over the full p_T range. The differential cross section in pp collisions is an essential observable for the study of the Quark Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. The absence of a medium formation in pp collisions serves as an essential baseline for studies of particle production and suppression due to parton energy-loss in the QGP. Since pp collisions at √s = 5.44 TeV were not measured by ALICE, the pp reference at this energy was constructed by using a power law interpolation between the s = 5.02 TeV and 7 TeV data. The pp results are compared to the particle production in Pb-Pb collisions at √s_NN = 5.02 TeV and Xe-Xe collisions at √s_NN = 5.44 TeV. The nuclear modification factor R_AA for Pb-Pb and Xe-Xe collisions was calculated and a strong suppression of high-p_T particles is observed in central collisions. The R AA in different systems allows for a differential study of the parton energy loss in the QGP. The comparison of the R AA in multiplicity intervals between the two systems provide insights into the path length dependence of a parton that propagates in the medium.

Note:

57 pages, 31 captioned figures, 3 tables, authors from page 53, submitted to PRC, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4292

Relativistic Nuclear Collisions
p nucleus: scattering
heavy ion: scattering
quark gluon: plasma
correlation function: transverse momentum
charged particle: multiplicity
charged particle: production
density: correlation
two-particle
rapidity

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