Event-wise <pt> fluctuations in Au-Au collisions at sqrt[sNN]=130 GeV

We present the first large-acceptance measurement of event-wise mean transverse momentum <pt> fluctuations for Au-Au collisions at nucleon-nucleon center-of-momentum collision energy sqrt[sNN] = 130 GeV. The observed non
We present the first large-acceptance measurement of event-wise mean transverse momentum <pt> fluctuations for Au-Au collisions at nucleon-nucleon center-of-momentum collision energy sqrt[sNN] = 130 GeV. The observed nonstatistical <pt> 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 <pt> 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 |<1,2 pi azimuth, and 0.15 <= pt <= 2 GeV/c. The width excess varies smoothly but nonmonotonically with collision centrality and does not display rapid changes with centrality which might indicate the presence of critical fluctuations. The reported <pt> fluctuation excess is qualitatively larger than those observed at lower energies and differs markedly from theoretical expectations. Contributions to <pt> fluctuations from semihard parton scattering in the initial state and dissipation in the bulk colored medium are discussed.
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Metadaten
Author:J. Adams, Clemens Adler, Jens Berger, Thomas Dietel, Dominik Bernhard Flierl, Thorsten Kollegger, Jens Sören Lange, L. J. Ruan, Reinhard Stock, Christof Struck, et al., STAR Collaboration
URN:urn:nbn:de:hebis:30-19140
Document Type:Article
Language:English
Date of Publication (online):2005/10/14
Year of first Publication:2005
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/10/14
Source:Phys. Rev. C 71, 064906 (2005), ©2005 The American Physical Society, http://link.aps.org/abstract/PRC/v71/e064906
HeBIS PPN:188866639
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:24.60.Ky Fluctuation phenomena
25.75.Gz Particle correlations and fluctuations
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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