5,676 research outputs found
Signature of Granular Structures by Single-Event Intensity Interferometry
The observation of a granular structure in high-energy heavy-ion collisions
can be used as a signature for the quark-gluon plasma phase transition, if the
phase transition is first order in nature. We propose methods to detect a
granular structure by the single-event intensity interferometry. We find that
the correlation function from a chaotic source of granular droplets exhibits
large fluctuations, with maxima and minima at relative momenta which depend on
the relative coordinates of the droplet centers. The presence of this type of
maxima and minima of a single-event correlation function at many relative
momenta is a signature for a granular structure and a first-order QCD phase
transition. We further observe that the Fourier transform of the correlation
function of a granular structure exhibits maxima at the relative spatial
coordinates of the droplet centers, which can provide another signature of the
granular structure.Comment: 22 pages, 5 figures, in LaTex, to be published in Physical Review
Single-Event Handbury-Brown-Twiss Interferometry
Large spatial density fluctuations in high-energy heavy-ion collisions can
come from many sources: initial transverse density fluctuations, non-central
collisions, phase transitions, surface tension, and fragmentations. The common
presence of some of these sources in high-energy heavy-ion collisions suggests
that large scale density fluctuations may often occur. The detection of large
density fluctuations by single-event Hanbury-Brown-Twiss interferometry in
heavy-ion collisions will provide useful information on density fluctuations
and the dynamics of heavy-ion collisions.Comment: 8 pages, 4 figures, invited talk presented at the XI International
Workshop on Correlation and Fluctuation in Multiparticle Production, Nov.
21-24, 2006, Hangzhou, Chin
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