Event-wise mean p_t fluctuations in Au-Au collisions at sqrt{s_{NN}} = 130 GeV

Simple item page
dc.creatorSTAR Collaboration
dc.creatorAdams, J.
dc.date2003-08-29
dc.date2005-04-26
dc.date.accessioned2026-07-07T11:10:43Z
dc.date.available2026-07-07T11:10:43Z
dc.descriptionWe present the first large-acceptance measurement of event-wise mean transverse momentum mean p_t fluctuations for Au-Au collisions at nucleon-nucleon center-of-momentum collision energy sqrt{s_{NN}} = 130 GeV. The observed non-statistical mean p_t fluctuations substantially exceed in magnitude fluctuations expected from the finite number of particles produced in a typical collision. The r.m.s. fractional width excess of the event-wise mean p_t distribution is 13.7 +/- 0.1(stat) +/- 1.3(syst)% relative to a statistical reference, for the 15% most-central collisions and for charged hadrons within pseudorapidity range |eta|<1, 2pi azimuth and 0.15 < p_t < 2 GeV/c. The width excess varies smoothly but non-monotonically with collision centrality, and does not display rapid changes with centrality which might indicate the presence of critical fluctuations. The reported mean p_t fluctuation excess is qualitatively larger than those observed at lower energies and differs markedly from theoretical expectations. Contributions to mean p_t mean fluctuations from semi-hard parton scattering in the initial state and dissipation in the bulk colored medium are discussed.
dc.description11 pages, 2 figures, submitted to Phys. Rev. C
dc.identifierhttps://arxiv.org/abs/nucl-ex/0308033
dc.identifierhttp://arxiv.org/abs/nucl-ex/0308033
dc.identifierPhys.Rev.C71:064906,2005
dc.identifierdoi:10.1103/PhysRevC.71.064906
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190858
dc.subjectNuclear Experiment
dc.titleEvent-wise mean p_t fluctuations in Au-Au collisions at sqrt{s_{NN}} = 130 GeV
dc.typetext

Files

Collections

arXiv