Refine
Year of publication
Document Type
- Working Paper (31) (remove)
Has Fulltext
- yes (31)
Is part of the Bibliography
- no (31)
Institute
- Physik (31) (remove)
The phase structure of the scalar field theory with arbitrary powers of the gradient operator and a local non-analytic potential is investigated by the help of the RG in Euclidean space. The RG equation for the generating function of the derivative part of the action is derived. Infinitely many non-trivial fixed points of the RG transformations are found. The corresponding effective actions are unbounded from below and do probably not exhibit any particle content. Therefore they do not provide physically sensible theories.
Rapidity distributions of net hyperons (Λ−Λ¯¯¯¯) are compared to distributions of participant protons (p−p¯¯¯). Strangeness production (mean multiplicities of produced Λ/Σ0 hyperons and ⟨K+K¯¯¯¯¯⟩) in central nucleus-nucleus collisions is shown for different collision systems at different energies. An enhanced production of Λ¯¯¯¯ compared to p¯¯¯ is observed at 200 GeV per nucleon.
Transverse momentum event-by-event fluctuations are studied within the string-hadronic model of high energy nuclear collisions, LUCIAE. Data on non-statistical pT fluctuations in p+p interactions are reproduced. Fluctuations of similar magnitude are predicted for nucleus-nucleus collisions, in contradiction to the preliminary NA49 results. The introduction of a string clustering mechanism (Firecracker Model) leads to a further, significant increase of pT fluctuations for nucleus-nucleus collisions. Secondary hadronic interactions, as implemented in LUCIAE, cause only a small reduction of pT fluctuations.
Hf-Fokussierung
(1989)