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ϕ-meson production in In–In collisions at Elab=158A GeV: Evidence for relics of a thermal phase
(2010)
Yields and transverse mass distributions of the ϕ-mesons reconstructed in the ϕ→μ+μ− channel in In+In collisions at Elab=158A GeV are calculated within an integrated Boltzmann+hydrodynamics hybrid approach based on the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport model with an intermediate hydrodynamic stage. The analysis is performed for various centralities and a comparison with the corresponding NA60 data in the muon channel is presented. We find that the hybrid model, that embeds an intermediate locally equilibrated phase subsequently mapped into the transport dynamics according to thermal phase-space distributions, gives a good description of the experimental data, both in yield and slope. On the contrary, the pure transport model calculations tend to fail in catching the general properties of the ϕ meson production: not only the yield, but also the slope of the mT spectra, compare poorly with the experimental observations at top SPS energies.
As Bakhtin noted, chronotopes arise from the density and fusion of temporal and spatial indicators. In prose narrative, the density of temporal and spatial indicators arises as a natural consequence of setting scenes and explaining action, and those indicators are fused by the centripetal forces of plot, character and so on that encourage us to read the various elements of the text as aspects of a coherent story and world. In non-narrative poetry, however, there is no story to drive the setting of scene or generation of character; there may not even be scene or character. As a result, temporal and spatial indicators can be quite sparse, and there may be little centripetal force to encourage their fusion. In a textual environment bereft of character, plot, scene, in which even the centripetal forces of syntax are frayed by linebreaks and other poetic devices, how can chronotopes form and function? [...] In the centripetal environment afforded by most prose narratives, the stable chronotopes and the relationships among them define consciousness, world and values. In the centrifugal environment of non-narrative poetry, chronotopes flicker and flow in a series of hints, glimpses, dissolves, defining consciousness, world and values via evanescence rather than stability. However, as I hope to show below, the evanescence of chronotopes in non-narrative poetry can be as central to the vitality and meaning of those texts as the stability of chronotopes is to the vitality and meaning of prose narratives.